MTD 110-302R000 User`s manual

MTD 120
Ref. 4202
(Color)
Ref. 4207
(B/N)--
BER
(Bit Error Rate)
TV & SAT Level Meter
User´s manual
TV & SAT Level Meter MTD 120
................................................................................................................................. Page
1.- GENERAL ..............................................................................................................................................
1.1.- Description .....................................................................................................................................
1.2.- Specifications .................................................................................................................................
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2.- SAFETY RULES .....................................................................................................................................
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3.- INSTALLATION .......................................................................................................................................
3.1.- Power Supply ................................................................................................................................
3.1.1.- Operation using the External DC Adapter ............................................................................
3.1.2.- Operation using Batteries .....................................................................................................
3.1.2.1.- Battery Charging ..........................................................................................................
3.2.- Installation and Start-up .................................................................................................................
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4.- OPERATING INSTRUCTIONS ..............................................................................................................
4.1.- Description of the Controls and Elements .....................................................................................
4.2.- Adjustment of Volume and Monitor Parameters ...........................................................................
4.3.- Selecting the Operation Mode: TV / Spectrum Analyser ...............................................................
4.4.- RF Band Selection: 5-862 MHz / 920-2150 MHz ..........................................................................
4.5.- Channel Tuning / Frequency Tuning .............................................................................................
4.6.- Automatic Transmission Search ....................................................................................................
4.7.- Selecting Analogue / Digital Mode .................................................................................................
4.8.- External Units Power Supply (EXT. SUPPLY) ..............................................................................
4.9.- TV Operating Mode .......................................................................................................................
4.9.1.- Selecting the Measurement Mode (MEASURE) ..................................................................
4.9.1.1.- Measuring the Video Carrier Level (Level) ..................................................................
4.9.1.1.1.- On-screen Measurement Information .................................................................
4.9.1.1.2.- Selecting TV Mode: TV, LV, SY (TV MODE) ......................................................
4.9.1.2.- Measuring the Video / Audio Ratio (V/A) .....................................................................
4.9.1.3.- Measuring the Carrier / Noise Ratio (C/N) ...................................................................
4.9.1.4.- Measuring the Power of Digital Channels (Channel power) ........................................
4.9.2.- TV Mode Functions Menu ....................................................................................................
4.9.2.1.- Selection of the RF Band: (Band switching) ................................................................
4.9.2.2.- Selection of the TV System and Standard (System & Standard) ................................
4.9.2.3.- Batteries and External Units Power Supply (Battery & Lnb) ........................................
4.9.2.4.- Data Logger Function ..................................................................................................
4.9.2.4.1.- Configuring the Data Logger Function ................................................................
4.9.2.4.2.- Selecting the Measurements to be Taken ..........................................................
4.9.2.4.3.- Taking Measurements .........................................................................................
4.9.2.4.4.- Exiting the Data Logger Function ........................................................................
4.9.2.4.5.- Examples of Data Logger Function Applications ................................................
4.9.2.5.- Clock ............................................................................................................................
4.9.2.6.- Input Video ...................................................................................................................
4.9.2.7.- Selecting the Channels Table (Channel set) ...............................................................
4.9.2.8.- Measurement Units ......................................................................................................
4.9.2.9.- Power Off Mode (Manual power) .................................................................................
4.9.2.10.- C/N setup ...................................................................................................................
4.9.2.11.- Channel Bandwidth (Channel BW) ............................................................................
4.9.2.12.- LNB Local Oscillator Frequency (Lnb local osc) ........................................................
4.9.2.13.- Video Polarity .............................................................................................................
4.9.2.14.- NICAM Channel .........................................................................................................
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ENGLISH
INDEX
User Manual
TV & SAT Level Meter MTD 120
User Manual
4.9.2.15.- Search Level ..............................................................................................................
4.9.2.16.- Teletext ......................................................................................................................
4.9.2.17.- DiSEqC Command Generator ...................................................................................
4.9.2.18.- Beep ...........................................................................................................................
4.9.2.19.- Equipment Information ...............................................................................................
4.9.2.20.- Exit .............................................................................................................................
4.10.- Spectrum Analyser Operating Mode ...........................................................................................
4.10.1.- Spectrum Analyser Mode Functions Menu ........................................................................
4.10.1.1.- Band Switching ...........................................................................................................
4.10.1.2.- Span ...........................................................................................................................
4.10.1.3.- Reference Level .........................................................................................................
4.10.1.4.- Dual Marker/Single Marker ........................................................................................
4.10.1.5.- Sweep ........................................................................................................................
4.10.1.6.- Reference Noise ........................................................................................................
4.10.1.7.- Channel Bandwidth ....................................................................................................
4.10.1.8.- Marker ........................................................................................................................
4.10.1.9.- Carrier ........................................................................................................................
4.10.1.10.- Bandwidth of the Spectrum Measuring Filter (Measure bandwidth) ........................
4.10.1.11.- Selecting the Channels Table (Channel set) ...........................................................
4.10.1.12.- Batteries and External Units Power Supply (Battery & Lnb) ....................................
4.10.1.13.- Exit ...........................................................................................................................
4.10.2.- Selecting the Measurement Mode ......................................................................................
4.10.2.1.- Measuring Carrier Levels (Level) ...............................................................................
4.10.2.2.- Measuring the Carrier / Noise ratio (C/N Referenced) ..............................................
4.10.2.3.- Measuring the Power of Digital Channels (Channel Power) .....................................
4.11.- Selecting the Sound Mode (Sound) ............................................................................................
4.12.- Measurement Configuration Memories .......................................................................................
4.12.1.- Storing a Measurement Configuration (STORE) ................................................................
4.12.2.- Retrieving a Configuration (RECALL) ................................................................................
4.13.- Direct Access to Functions .........................................................................................................
4.14.- Printing Measurements and Memories ........................................................................................
4.14.1.- Handshake and Control Lines ............................................................................................
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5.- BER MEASURES ...................................................................................................................................
5.1.- Description .....................................................................................................................................
5.2.- BER measurement mode selection ...............................................................................................
5.3.- QAM modulation ............................................................................................................................
5.4.- QPSK modulation ..........................................................................................................................
5.5.- COFDM modulation .......................................................................................................................
5.6.- DVB Channels Identifier ................................................................................................................
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6.- DESCRIPTION OF THE INPUTS AND OUTPUTS ...............................................................................
6.1.- RF input .........................................................................................................................................
6.2.- RS-232C serial port .......................................................................................................................
6.3.- Scart (DIN EN 50049) ....................................................................................................................
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7.- MAINTENANCE .....................................................................................................................................
7.1.- Considerations about the Screen ..................................................................................................
7.2.- Internal fuses which user cannot replace .....................................................................................
7.3.- Replacing the Batteries .................................................................................................................
7.4.- Cleaning Recommendations .........................................................................................................
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APPENDIX A: Channel-Frequency Tables ..................................................................................................
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TV & SAT Level Meter MTD 120
User Manual
SAFETY NOTES
Read the instruction manual before using the equipment, mainly " SAFETY RULES " paragraph.
The symbol
on the equipment means "SEE INSTRUCTION MANUAL".
In this manual may also appear as a Caution or Warning symbol.
Warning and Caution statements may appear in this manual to avoid injury hazard
or damage to this product or other property.
1.- GENERAL
1.1.- Description
The result of uniting long experience in the design of TV signal analysers with the latest in technological progress, the MTD 120 brings
together the functions installers seek most, all in one small, light-weight, portable instrument.
The range of frequencies covered, from 5 to 862 MHz and from 920 to 2150 MHz, makes MTD 120 an excellent instrument for FM radio,
terrestrial TV, cable TV (CATV, 'Community Antenna Television', where the subband tuning margin, from 5 to 45 MHz, enables the user to
carry out tests on the return channel), satellite TV, MMDS microwave links, VSAT ('Very Small Aperture Terminal') systems, digital TV and
intermediate frequency analysis (38.9 MHz). Furthermore, its high resolution frequency, 50 kHz, makes FM measurements much easier.
The MTD 120 includes the main TV standards: M, N, B, G, I, D, K and L, adopting, apart from the characteristic parameters of the
standard, the correcting automatic system to obtain in all the cases an accurate measuring of the input signal level. It admits any TV system
(PAL, SECAM and NTSC) and allows the user to work directly with digital TV signals for which it provides directly the measuring of power
and carrier-to-noise ratio (C/N). Being a multistandard instrument, it can be efficiently used in any country of the world. Its accuracy and
reliability meet the needs of the most demanding users.
A powerful microprocessor automatically handles a large part of the operations necessary to optimise the process of measurement; for
example, continuous frequency synthesis, measurement correction, the appropriate selection of the attenuators and the automatic cut-off after
the device has been inactive for a certain period of time.
The Spectrum Analyser mode enables all the signals on a band to be viewed on the monitor at the same time to measure analogue
channels level, C/N ratio referenced to a noise frequency defined by the user and digital channels power using an integration method. The
bandwidth of the measuring filter can be modified to improve frequency resolution. This is an indispensable feature, as high channel density is
present on all transmission systems today. Spectrum display can be varied between full span (the entire band) and 8 MHz terrestrial or 32
MHz satellite. In addition, there are two markers in order to locate and list frequencies, to read signal level and frequency difference, and the
level between both.
The selection of sound subcarrier is automatic, depending on the standard, or tunable between 4 and 9 MHz. When decoding TV sound it
is possible to choose between the NARROW and WIDE filter to obtain the best carrier discrimination. It includes a NICAM decoder (with BER
measurement); the possibility to commute the channel that is delivered to the loudspeaker enables the user to check the sound stereo and
dual.
To enhance its convenience of use, it has 99 memories to store the different measuring configurations: name of the configuration,
frequency, TV system, type of measurement, external units powering, units of measurement and sound. Moreover, the DATALOGGER
function permits the acquisition and storage of up to 9801 measures (99 configurations x 99 points of measure) that makes it much easier to
test systems in which a large number of measurements have to be made, and enables further processing of all the information acquired.
Also, the level meter incorporates the teletext function, a DiSEqC command generator and permits to supply different voltages to the
external unit (13 V / 15 V / 18 V / 24 V terrestrial TV, and 13 V / 15 V / 18 V / 13 V + 22 kHz / 15 V + 22 kHz / 18 V + 22 kHz satellite TV).
A SCART connector has been also included with input/output of audio/video.
The MTD 120 is powered by rechargeable batteries or connected to the mains through the supplied external DC power adapter.
It also incorporates a RS-232C interface which enables the user to connect the instrument to a PC for data recording, remote-control of
the instrument and to a printer in order to print out the measurements.
(*) DiSEqC™ is a trademark of EUTELSAT.
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ENGLISH
The signal level measured is indicated numerically in absolute values and, optionally, on an analogue bar shown superimposed on the
monitor image, that facilitates the detection of the maximum level. Moreover, in the LV sound mode, the loudspeaker emits a tone whose
frequency depends on the level of the signal received, which is very useful when installing antennas. It is also possible to display on screen
the line synchronism pulse like on an oscilloscope screen.
TV & SAT Level Meter MTD 120
User Manual
1.2.- Specifications
TUNING
Tuning modes
Resolution
Automatic search
Memory
RF INPUT
Frequency range
QAM signals
QPSK signals
COFDM signals
Level range
QAM signals
QPSK signals
COFDM signals
Impedance
Connector
Maximum signal
Maximum input voltage
DC to 100 Hz
5 MHz to 2150 MHz
LEVEL MEASUREMENT
Measurement range
Terrestrial TV & FM bands
Satellite TV band
Reading
Digital
Analogue
Measurement bandwidth
Audible indicator
Accuracy
Sub-band
Terrestrial bands
Satellite band
Overrange indication
BER MEASUREMENT
QAM signals
Measurement
Reading
QPSK signals
Measurement
Reading
COFDM signals
Measurement
Reading
Digital frequency synthesis. Continuous tuning from 5 to 862 MHz and from 920 to 2150 MHz
Frequency, Channel or Memory. Channel plan configurable on demand
50 kHz
Threshold level selectable
99 positions for measurement configurations
47 MHz to 862 MHz
950 MHz to 2150 MHz
470 MHz to 862 MHz
45 dBµV to 110 dBµV
44 dBµV to 99 dBµV
45 dBµV to 100 dBµV
75 Ω
Universal, with BNC or F adapter
130 dBµV
50 V rms (powered by the power adapter)
30 V rms (not powered by the power adapter)
130 dBµV
20 dBµV to 130 dBµV (10 µV to 3.16 V)
30 dBµV to 120 dBµV (31.6 µV to 1 V)
Auto-range, reading is displayed on an OSD window
Absolute value calibrated in dBµV, dBmV or dBm
Relative value through an analogue bar on the screen
230 kHz (Terrestrial band) • 4 MHz (Satellite band) (maximum band ripple 1 dB).
LV audio. A tone with pitch proportional to signal strength.
± 2.5 dB (50-120 dBµV, 5-45 MHz)(22ºC ± 5ºC)
±1.5 dB (30-120 dBµV, 48,25-861 MHz)(22ºC±5ºC)
±1.5 dB (40-100 dBµV, 920-2050 MHz)(22ºC ± 5ºC)
vI , ^
I
BER before FEC (Forward Error Correction). Number of non correctable packets received in the
measurement time.
Numerical and level bar.
BER before Viterbi
BER after Viterbi
Number of non correctable packets received in the measurement time.
Numerical and level bar.
BER after Viterbi
CSI (Channel Status Information). Qualitative measurement about channel quality. Readout between
0 and 100%, the 0 % value corresponds to maximum quality.
Number of wrong packets received in the measurement time.
Numerical and level bar.
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TV & SAT Level Meter MTD 120
User Manual
DCI FUNCTION
DVB Channel Identifier. It provides information about the channel we are making the measurement.
QAM SIGNAL PARAMETERS
Demodulation
Symbol rate
Symbol Rate acquisition range
Carrier frequency offset
Nyquist filter roll-off(α)
Spectral inversion
Equivalent noise degradation
16 / 32 / 64 / 128 / 256 QAM
1000 to 7000 kbauds
± 240 ppm
± 0,08 x Symbol rate
0,15
Selectable: On, Off
< 1,5 dB
Symbol Rate acquisition range
Carrier frequency offset
Nyquist filter roll-off (α)
Code rate
Spectral inversion
Equivalent noise degradation
COFDM SIGNAL PARAMETERS
Carriers
Guard Interval
Code Rate
Modulation
Spectral inversion
Hierarchy
FEC
MEASUREMENTS IN TV MODE
Terrestrial bands
Analogue channels
Digital channels
Satellite band
Analogue channels
Digital channels
DATA LOGGER function
SPECTRUM ANALYSER MODE
Satellite band
Terrestrial bands
Measurement bandwidth
Terrestrial
Satellite
Span
Terrestrial
Satellite
Markers
Measurements
Terrestrial bands
Analogue channels
Digital channels
Satellite band
Analogue channels
Digital channels
55 MHz
23000 to 30000 kbauds
4000 to 30000 kbauds for channel spacing frequency ≥ 29.5 MHz
± 70 ppm
± 0,1 x Symbol rate
0,35
1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9 and Auto.
Selectable: On, Off and Auto except for the following values of Code Rate: 4/5, 5/6, 6/7 and 8/9.
< 1 dB
2k / 8k (user definable)
1/4, 1/8, 1/16, 1/32 (user definable)
1/2, 2/3, 3/4, 5/6, 7/8
QPSK, 16QAM, 64QAM
On/off
Reed-Solomon (204,188) and Viterbi
Level, Video-Audio ratio and Carrier-Noise ratio (Auto and Referenced).
Channel power (Auto) and Carrier-Noise ratio (Auto and Referenced).
Level and Carrier-Noise ratio (Auto and Referenced)
Channel power (Auto) and Carrier-Noise ratio (Auto and Referenced).
Automatic acquisition of up to 9801 measurements
30 dBµV to 120 dBµV (31.6 µV to 1 V)
20 dBµV to 130 dBµV (10 µV to 3.16 V)
230 kHz, 1 MHz selectable
230 kHz, 4 MHz selectable
Full span (full band), 500, 200, 100, 50, 32, 16, 8 MHz selectable.
Full span (full band), 500, 200, 100, 50, 32 MHz selectable.
2 with level, frequency, level difference and frequency difference indications.
Level and Carrier-Noise ratio (Referenced)
Channel power (Integration method) and Carrier-Noise ratio (Referenced).
Level and Carrier-Noise rate (Referenced)
Channel power (Integration method) and Carrier-Noise ratio (Referenced).
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QPSK SIGNAL PARAMETERS
IF bandwidth
Symbol rate
TV & SAT Level Meter MTD 120
MONITOR DISPLAY
Monitor
Colour system
TV standard
Synchronism and Burst
Spectrum mode
Sensibility
Synchronism 50/60 Hz
VIDEO SIGNAL
External video input
Sensibility
Video output
User Manual
LCD colour 4 inches (ref. 4202)
Black & White 4 1/2 inches (ref. 4207)
PAL, SECAM and NTSC
M, N, B, G, I, D, K and L
Graphic representation over the picture
Variable span and reference level
40 dBµV for correct synchronism
Automatic selection according to the system
Scart (automatic)
1 Vpp (75) positive video
Scart (75)
SOUND
Input
Outputs
Demodulation
De-emphasis
Subcarrier
Variable
Fixed
Terrestrial
Satellite
According to the active standard: 4.50 - 5.50 - 5.80 -6.00 - 6.50 - 6.65 - 5.74 - AM - FM - LV - OFF.
6.65 - 5.80 - 6.50 - 7.02 - LV - OFF
TELETEXT
Decodes at 1.5 level
Scart
Built in speaker, Scart
AM, FM, TV and NICAM, selectable
50 µs
Digital frequency synthesis
From 4 to 9 MHz, 10 kHz resolution
RS-232C INTERFACE
EXTERNAL UNITS POWER SUPPLY
Terrestrial
Satellite
22 kHz signal
Voltage
Frequency
Maximum power
Through the RF input connector
External or 13/15/18 V
External or 13/15/18 V
Selectable
0.6 V ± 0.2 V
22 kHz ± 4 kHz
5W
DiSEqC GENERATOR (*)
According to DiSEqC 1.2 standard
POWER SUPPLY
Internal
Batteries
Autonomy
Recharging time
External
Voltage
Consumption
Auto power off
2 x 6 V 3.3 Ah lead acid batteries
> 1 hour non stop
12 h starting from a complete discharge
12 V
42 W
After 15 minutes without operating on any control. Deactivable.
OPERATING ENVIRONMENTAL CONDITIONS
Altitude
Up to 2000 m
Temperature range
From 5 to 40 º C
Max. relative humidity
80 % (up to 31ºC), decreasing lineally up to 50% at 40º C.
(*) DiSEqC™ is a trademark of EUTELSAT.
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TV & SAT Level Meter MTD 120
MECHANICAL FEATURES
Dimensions
Weight
User Manual
280 (W) x 95 (H) x 250 (D) mm
5,2 kg
INCLUDED ACCESSORIES
Rechargeable battery 6 V, 3.3 Ah
"F"/F-BNC/F adapter
"F"/F-"DIN"/F adapter
"F"/F-"F"/F adapter
External DC adapter
Carrying bag
ENGLISH
NOTE: BER measurement options of QPSK, QAM or COFDM modulated signals vary based on the model of used Measurer.
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TV & SAT Level Meter MTD 120
User Manual
2.- SAFETY RULES
* Use this equipment connected only to systems with their negative of measurement connected to ground potential.
* The external DC adapter is a Class I equipment, for safety reasons plug it to a supply line with the corresponding ground terminal.
* This equipment can be used in Overvoltage Category II installations and Pollution Degree 2 environments.
* When using some of the following accessories use only the specified ones to ensure safety:
Rechargeable batteries
External DC adapter
* Observe all specified ratings both of supply and measurement.
* Remember that voltages higher than 60 V DC or 30 V AC rms are dangerous.
* Use this instrument under the specified environmental conditions.
* The user is only authorized to carry out the following maintenance operations:
Batteries replacement
On the Maintenance paragraph the proper instructions are given.
Any other change on the equipment should be carried out by qualified personnel.
* When using the power adaptor, the negative of measurement is at ground potential.
* Do not obstruct the ventilation system of the instrument.
* Use for the signal inputs/outputs, specially when working with high levels, appropriate low radiation cables.
* Follow the cleaning instructions described in the Maintenance paragraph.
* Symbols related with safety:
DIRECT CURRENT
ALTERNATING CURRENT
DIRECT AND ALTERNATING
GROUND TERMINAL
PROTECTIVE CONDUCTOR
FRAME TERMINAL
EQUIPOTENTIALITY
CAUTION (Risk of electric shock)
ON (Supply)
DOUBLE INSULATION (Class II Protection)
OFF (Supply)
FUSE
CAUTION REFER TO MANUAL
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TV & SAT Level Meter MTD 120
User Manual
3.- INSTALLATION
3.1.- Power Supply
The MTD 120 is a portable instrument powered by two 6 V - 3.3 Ah lead acid batteries. There is also an external DC adapter provided for
mains connection and battery charging.
3.1.1.- Operation using the External DC Adapter
Connect the external DC adapter to EXT. SUPPLY [38] on the MTD 120 side panel. Connect the DC adapter to the mains. Then, press
the MTD 120 on/off key
[2] The level meter is now in operation and the batteries are slowly charged. When the instrument is connected to
the mains, the CHARGER indicator [7] remains lit.
3.1.2.- Operation using Batteries
For the device to operate on the battery, disconnect the power cable and press the on/off key
the equipment for more than 1 hour non-stop.
[2]. The fully charged battery can power
If batteries are very weak, the battery cut-off circuit will prevent the device from functioning at the same time the beeper will be heard. In
such a situation batteries must be recharged immediately.
Before taking any measurements, you have to check the charge state of the batteries by checking the battery charge level indicator
BATTERY OK [8] on the front panel, or Battery & Lnb function on the TV mode functions menu (see section '4.9.2.3 Batteries and External
Units Power Supply').
The BATTERY OK [8] led indicates the battery charge state. For battery charge levels close to 100% and if the unit is powered by the
external power adapter, it remains lit. For battery levels between 100% and low battery it starts to flicker, gradually fading as the charge level
decreases. On reaching Low Battery, it ceases to light up at all. When the instrument indicates a Low Battery (the led does not light up) the
batteries must be charged immediately. When the low battery level is reached, the monitor momentarily displays the message VERY LOW
BATTERY and the beeper sounds.
3.1.2.1.- Battery Charging
To fully charge the batteries, connect the instrument to the external DC adapter without pressing the on/off key
[2]. The length of
time it takes to recharge it depends on the condition of the battery. If they are very low the recharging period is about 12 hours. The
CHARGER [7] indicator should remain lit.
IMPORTANT
IMPORTANT
The lead acid batteries of the instrument must be kept fully charged during periods when it is not in use. To ensure the best
results, the batteries must always be fully charged. If the equipment is in storage or is used only occasionally for a long period of time,
it is ABSOLUTELY NECESSARY to check the full-charge functions periodically (every six months, for example), and to compensate for
the self-discharging effect of the batteries. The rate at which a fully charged battery self-discharges depends on the temperature. For
example, at an ambient temperature of 20º C, the battery suffers a 50% loss after 16 months, and at 40º C it loses the same charge in
only 5 months. If the battery remains very weak for a period of several days, it cannot be recharged since the plates are sulphated and
must be replaced.
3.2.- Installation and Start-up
The MTD 120 level meter is designed for use as a portable device.
When the
[2] key is pressed, the instrument is in the automatic power-off mode; that is, the device is automatically disconnected fifteen
minutes after the last time a key has been pressed. When turning on the unit, automatic power-off mode may be deactivated by holding down
the
[2] key until you hear two acoustic indications, later "MANUAL POWER OFF" message will appear on the lower side of the monitor.
When the device is operating, it is also possible to select the manual power-off mode by means of the Manual power function of the TV
functions menu.
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If batteries are completely discharged, it is advisable to recharge them for a period of one hour before putting the instrument into
operation again. In these circumstances it is not recommended to power external units at the same time batteries are recharged.
TV & SAT Level Meter MTD 120
User Manual
4.- OPERATING INSTRUCTIONS
4.1.- Description of the Controls and Elements
1
2
3
4
0
1
A/D
2
SPECT
CH/F
SHIFT
SCREEN
EXT VIDEO
3
LEVEL
4
MONITOR
5
5
SEARCH
MEMORY
8
7
LNB
ENTER
SOUND
6
9
FA
DRAIN
MODE
6
BATTERY OK
FB
CHARGER
Medidor de Campo Color TV&SAT MTD 120
11
10
9
8
7
Figure 1.- Front panel.
[1]
On / Off key. This turns on the instrument, and the user can select either manual or automatic power-off.
[2] MONITOR.
Enables the measurement information displayed on-screen in TV mode (level measurement) to be selected.
[3] SCREEN.
Activation of VOLUME, CONTRAST, BRIGHTNESS, SATURATION (only ref. 4202) and HUE (this last only for NTSC colour system
and ref. 4202) control menus.
[4] MAIN KEYBOARD
12 keys to select functions and entering numeric data.
20 21 22 23
0
1
A/D
2
SPECT
3
LEVEL
MODE
25
30
4
CH/F
5
SEARCH
6
MEMORY
SOUND
24
26
SHIFT
7
8
LNB
9
FA
FB
31 27 28 29
Figure 2.- Main keyboard.
[5] ENTER.
Validation of the different options.
In TV mode, press the ENTER [5] key to display a menu containing different functions, some are dependent on the band and the
standard:
Band switching
Permits to change from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa.
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TV & SAT Level Meter MTD 120
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System & Standard
Selects the colour system (PAL, SECAM or NTSC) and the TV standard (B/G, D/K, I, L, M, N or Digital).
Battery & Lnb
Displays battery voltage and external units power supply voltage and current (V Lnb and I Lnb).
Data logger
Permits to acquire and to store up to 9801 measurements automatically.
Clock
Displays time and date, and allows them to be modified.
Input Video
Enables Scart commutation signals to be activated, deactivated or set to automatic/subordinate mode.
Channel set
Selects active channels table.
Units
Selects the measuring units: dBµV, dBmV or dBm.
Manual power
Sets power-off as Manual or Automatic.
C/N setup
Defines the C/N measuring method between Auto or Referenced.
Reference noise
(Only in C/N Reference noise mode). Defines the frequency where measure the noise level.
Channel BW
(Satellite band or digital channels). Defines channel bandwidth. Indispensable for measuring digital channels
and satellite band channel C/N.
Lnb local osc
(Only satellite band). It defines the frequency of the local oscillator (L.O.) of the LNB.
Video polarity
(Only satellite band, analogue channels). This selects the polarisation of the video carrier.
Nicam channel
(Only analogue channels). This selects the NICAM sound channel that is sent to the loudspeaker.
Search level
(Only analogue channels). Selects the threshold level of the automatic station search function.
Teletext
(Only analogue channels). Sets teletext information.
DiSEqC
(Only satellite channels). Defines a sequence of DiSEqC commands and permits to send them.
Beep
Activates (ON) / deactivates (OFF) the beeper.
Equipment info.
Displays information on the instrument: serial number, version of control software, options installed, etc.
Exit
Exits from the function menu.
Permits to switch from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa.
Span
Defines the frequency range displayed between Full (the entire band), 500 MHz, 200 MHz, 100 MHz, 50
MHz, 32 MHz, 16 MHz and 8 MHz (the latter two only for terrestrial bands).
Reference level
Defines the reference level between 70 and 130 dBµV in 10 dB steps.
Dual marker
(Only analogue channels, level measurement mode and single marker mode). Enables dual markers to be
shown on the displayed spectrum.
Marker A
(Only in dual marker mode). Selects marker A as the active marker (tuneable).
Marker B
(Only in dual marker mode). Selects marker B as the active marker (tuneable).
Single marker
(Only in dual marker mode). Activates the single marker on the displayed spectrum.
Sweep
Selects sweep speed in spectrum mode between Fast (fast sweep, low accuracy) and High Resolution
(slow sweep, high accuracy).
Reference noise
(Only in C/N measurements). Permits to define the frequency where noise level will be measured (see Carrier
function).
Channel bandwidth
(Only in Channel Power measurements). Permits to define channel bandwidth (see Marker function).
Marker
(Only when measuring Channel power and after defining the Channel bandwidth). Permits to change the
tuning frequency by means of the
keys.
Carrier
(Only when measuring C/N Referenced and after defining the Reference noise). Permits to change the tuning
frequency by means of the
keys.
Measure bandwidth
Selects the bandwidth of the spectrum measuring filter from among:
Terrestrial channels:
230 kHz or 1 MHz.
Satellite channels:
230 kHz or 4 MHz.
Channel set
Selects active channels table.
Battery & Lnb
Displays battery voltage and external units power supply voltage and current (V Lnb and I Lnb).
Exit
Exits from the function menu.
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In Spectrum Analyser mode the menu displays the following functions:
Band switching
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[6]
Tuning control and moving between the various on-screen menus.
Tuning purposes: when pressing
key, frequency increases while when pressing
To shift along the on-screen menus: when pressing
option moves downwards.
key, frequency decreases.
key, active option moves upwards while when pressing
key, active
[7] CHARGER.
External DC adapter operation indicator. When batteries are installed the battery charger is automatically activated.
[8] BATTERY OK.
Battery charge level indicator.
[9] DRAIN.
External units power supply indicator. Lights up when the MTD 120 supplies a current to the external unit.
[10] EXT VIDEO.
It lights up when an external video signal is present through the SCART connector [39].
[11] Monitor
[20] A/D
Switches between analogue and digital mode.
Key number 0 to enter numeric data.
[21] SPECT.
Enables switching between the TV and the Spectrum Analyser operation mode, and back again.
Key number 1 to enter numeric data.
[22] LEVEL.
Enables the type of measurement to be selected. The types of measurements available depend on the band, the standard, the
options included and the operating mode.
Key number 2 to enter numeric data.
[23] MODE
Selects the information displayed on-screen in TV operation mode (LV measurement).
Key number 3 to enter numeric data.
[24] SEARCH
This is the function for automatic station search. Starting at the present frequency or channel, it searches until finds a station with an
adequate level. The threshold level (search level) can be defined by means of the TV mode functions menu between 30 and 99
dBµV.
Key number 4 to enter numeric data.
[25] MEMORY
This key enables the measurement configuration to be stored/recalled. Each configuration has the following information: name
assigned to memory, memory number, Channel or frequency (Freq), TV system (TV Sys), measurement mode (Meas), external
units power supply (V Lnb), measurement units (Units) and Sound. The memory can store up to 99 measurement configurations
(numbered from 1 to 99).
Key number 5 to enter numeric data.
[26] SOUND
This selects the type of sound. The options available in each case depend on the band and the standard selected (see section 4.11
Selecting the Sound Mode).
Key number 6 to enter numeric data.
[27] LNB
Enables selecting the power supply to the external units. Available voltages are: External, 13 V, 15 V and 18 V for the terrestrial band
and External, 13 V, 15 V, 18 V, 13 V + 22 kHz, 15 V + 22 kHz and 18 V + 22 kHz for the satellite band.
Key number 7 to enter numeric data.
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[28] FA
Direct access key which can be assigned to any function on any menu.
Key number 8 to enter numeric data.
[29] FB
Direct access key which can be assigned to any function on any menu.
Key number 9 to enter numeric data.
[30] CH/F
Switches tuning mode between channel and frequency. In channel mode the tuning frequency is defi ned by the active channels table
(CCIR, OIRT, ...). See channel-frequency tables in Appendix A.
Decimal point key to enter numeric data.
[31] SHIFT
Enables the desired frequency to be directly tuned using the numeric keyboard. Also acts as a SHIFT key for moving across different
fields on some screens.
35 36 37
38
RS-232C
EXT.
SUPPLY
RST
SCART ITF
39
Figure 3.- Side panel connections.
[35] RF
. RF signal input.
ATTENTION
Note the importance to protect the RF
[35] input signal with an accessory to block the AC voltages used in CATV cables
(needed to feed the amplifiers) and remote mode.
[36] RESET button
Enables the user to restart the instrument if there is any irregularity in its functioning. If it is necessary to reset the instrument, press
the reset button with the instrument turned off.
[37] Connector RS-232C
Enables the remote control of the MTD 120 from a personal computer, as well as data dumping to a printer.
[38] External 12 V power supply input
[39] Scart socket
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Maximum level 130 dBµV. Universal connector for F/F or F/BNC adapter, with input impedance of 75Ω.
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4.2.- Adjustment of Volume and Monitor Parameters
Repeatedly pressing key SCREEN [3] sequentially activates the VOLUME, CONTRAST, BRIGHTNESS, SATURATION and HUE (this
last only for NTSC colour system) control menus. On activation of a menu for a specific parameter the screen displays a horizontal bar whose
length is proportional to the parameter level, to modify this value simply press keys
[6]. To exit the menu and validate the new value
press key ENTER [5].
4.3.- Selecting the Operation Mode: TV / Spectrum Analyser
The MTD 120 has two basic operation modes: TV and Spectrum Analyser. To switch from one operation mode to the other press key
SPECT [21].
In the TV operation mode the demodulated television signal is shown on-screen; this is the default operation mode, various functions can
be selected, as shown in the following paragraphs.
In the Spectrum Analyser operation mode the screen displays the power spectrum of the active band (terrestrial or satellite). The span,
the reference level and the measuring filter bandwidth are variable as will be shown in paragraph '4.10 Spectrum Analyser Operation Mode'.
4.4.- RF Band Selection: 5-862 MHz / 920-2150 MHz
Tuning is continuous between 5 and 862 MHz (terrestrial band) and between 920 and 2150 MHz (satellite band). There are three ways of
changing the active band:
1. Press key ENTER [5] to accede to the functions menu, if necessary press keys
then press key ENTER [5] again. The RF band will be switched automatically.
[6] to select the Band switching function and
2. Press key SHIFT [31] and select a frequency on the new band using the numeric keyboard. The fifth digit and second decimal act as
confirmation. For example, if the active band is the 920 to 2150 MHz band and you wish to tune the 49 MHz frequency (belonging to
the 5/45 to 862 MHz band), press key SHIFT [31] and then enter 49.00 or 0049.0 using the numeric keyboard.
3. Recall a memory with a tuning frequency belonging to the band you wish to access. (See section '4.12 Measurement Configuration
Memories').
4.5.- Channel Tuning / Frequency Tuning
Pressing key CH/F [30] the MTD 120 switches from frequency tuning to channel tuning and back again.
In channel tuning mode pressing keys
[6] sequentially tunes the channels defined in the active channels table (see the Channel
set function in the TV mode functions menu, section '4.9.2.7 Selecting the Channels Table'). Pressing key
frequency increases while
pressing key
frequency decreases.
In frequency tuning mode there are two ways of tuning:
1. Pressing keys
[6].
By means of keys
[6] selects the desired frequency (tuning is continuous from 5 to 862 MHz and from 920 to 2150 MHz). When
pressing key
frequency increases while pressing key
frequency decreases.
2. Using the keyboard.
Press key SHIFT [31](the frequency listing will disappear), next enter the frequency value in MHz using the numeric keyboard, the fifth
digit and the second decimal act as confirmation. The MTD 120 will calculate the tuneable frequency closest to the entered value and
then display it on-screen.
4.6.- Búsqueda Automática de Emisoras
In the TV mode, by pressing the SEARCH [24] key search starts at the present frequency or channel until it finds a transmission with a
level higher than the search level. The threshold level is defined by means of the Search level function of the TV mode functions menu (see
paragraph '4.9.2.15 Search Level'.).
The Search function halts the search process when the end of the present band is reached, if it is in frequency mode, or when a key is
pressed. In channel mode, the search process is halted when the last channel of the group selected is reached (see Appendix A). The sound
is deactivated during the search process.
4.7.- Selecting Analogue / Digital Mode
Measuring the characteristics of a channel depends, in the first place, on the type of modulation: analogue or digital.
Use key A/D [20] to switch between analogue and digital channels. When switching to a new modulation, the MTD 120 activates the last
measurement configuration used for that modulation.
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4.8.- External Units Power Supply (EXT. SUPPLY)
The MTD 120 can supply the voltage needed to power the external units (antenna preamplifiers, in the case of terrestrial TV, or LNB, in
the case of satellite TV).
Maximum input levels
DC to 100 Hz
50 V rms (powered by the power adapter)
30 V rms (not powered by the power adapter)
5 MHz to 2150 MHz
130 dBµV
To select the supply voltage of the external units, press key LNB [27], and the screen will display a functions menu labelled EXT.
SUPPLY listing the choice of voltages (which will depend on the band being used). Use keys
[6] to select the desired voltage and
press key ENTER [5] to activate it. The following table shows the choice of supply voltages:
Band
SATELLITE
TERRESTRIAL
Powering voltages
External
13 V
15 V
18 V
13 V + 22 kHz
15 V + 22 kHz
18 V + 22 kHz
External
13 V
15 V
18 V
Table 1.- External units powering voltages.
In the External power supply mode the unit powering the amplifiers before the antenna (terrestrial television) or the satellite TV receiver
(house-hold or community) also powers the external units.
The DRAIN [9] indicator lights when current is flowing to the external unit. If any kind of problem occurs (e.g., a short circuit), an error
message appears on the monitor ('SUPPLY SHORT'), the acoustic indicator will be heard and the instrument will cease to supply power. The
MTD 120 does not return to its normal operating state until the problem has been solved.
When the external unit is powered with one of these voltages, particulary 18 V, it is not advisable for the instrument to function
for more than three minutes non-stop. Since the total consumption is very high, the duration of the battery charge is shortened
considerably. It is advisable to disconnect the instrument when it is not taking measurements.
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4.9.- TV Operating Mode
4.9.1.- Selecting the Measurement Mode (MEASURE)
The types of measurements available depend on the band, the standard, the operating mode and the options included in the appliance.
Terrestrial band - Analogue channels:
Level
Level measurement of the currently tuned carrier.
Video / Audio
Video carrier to audio carrier ratio.
C/N
Video carrier to noise ratio. There are two methods to make this measurement (selectable through the C/N setup
function):
Auto: In-channel measurement. Noise level is measured at a frequency where modulation contents is minimum. After
a small period of time, minimum measured level corresponds to noise level.
Referenced: The user defines the frequency where noise level will be measured (by means of the Reference noise
function). This frequency will be used to measure noise level for all channels.
Terrestrial band - Digital channels:
Channel power
Automatic method: channel power is measured assuming that power spectral density is uniform throughout channel
bandwidth. To measure it correctly it is indispensable to define the Channel BW.
C/N
Two methods selectable through the C/N setup function:
Auto: Out-channel measurement. Noise level is measured at fnoise = ftuning - 1/2 Channel BW. To measure it correctly
digital channel must be tuned at its central frequency.
Referenced: The user defines the frequency where noise level will be measured (by means of the Reference noise
function). This frequency will be used to measure noise level for all channels.
Satellite band - Analogue channels:
Level
Level measurement of the currently tuned carrier.
C/N
Video carrier to noise ratio (Auto or Referenced, equivalent to terrestrial band, digital channels).
Satellite band - Digital channels
Channel power
Automatic method.
C/N
Channel level to noise ratio (Auto or Referenced, equivalent to terrestrial band, digital channels).
To change the measurement mode press key LEVEL [22]. The screen will display a menu with the measurement modes which can be
selected.
MEASURE
Level
C/N (Referenced)
Exit
Figure 4.- Measuring mode selection (satellite band, analogue channels).
To select a measurement mode press keys
[6] until it is marked (e.g., Level in the previous figure), then press key ENTER [5] or
key LEVEL [22] to activate the selected measurement mode.
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4.9.1.1.- Measuring the Video Carrier Level (Level)
If you select the Level measurement mode, the screen shows a window with the signal level, when selected with the key MONITOR [1]
(see next section).
WARNING
If a sudden signal level increase is produced at the RF input, and it is beyond the total signal levels of:
Terrestrial band:
95 dBµV
Satellite band:
105 dBµV
the tuning circuit may become out of control, giving as a result wrong level readings.
If this situation occurs, disconnect the input signal, change to Spectrum Analyser mode and select a Reference Level of 130
dBµV. Then connect the signal again and modify the Reference Level according to present signals.
Similar effects can be observed when at the RF input appears an important number of carriers with a high level. To be able to determinate
the equivalent level of a carrier group (with similar levels) at the RF input, it is possible to use the expression:
Lt = L + 10 log N
Lt: equivalent total level
L: average level of the carriers group
N: number of carriers
So, if there are ten carriers with a level around 90 dBµV, their equivalent level will be:
90 dBµV + 10 log 10 = 100 dBµV
Observe that in this case, loss of tuning by overload of the RF input may occur besides other effects such as tuner saturation and
generation of intermodulation products that may mask the spectrum visualization.
4.9.1.1.1.- On-screen Measurement Information
In TV operation mode, the measurement information to be displayed on-screen is selected by pressing key MONITOR [1]. Three
possibilities are offered, selected cyclically:
- TV image with a window in the lower part of the screen displaying the signal level and frequency/channel.
- TV image with a window displaying information on the name assigned to memory, power supply to external units, sound, colour system,
TV standard, level and frequency/channel.
- TV image only.
In addition to operating as a television set, the monitor of the MTD 120 can act as an analogue level indicator, and can display the line
synchronising pulse just as it would appear on a screen of an oscilloscope.
To change the TV mode press key MODE [23], and the following screen will appear:
TV MODE
TV
TV+LV
TV+LV+SYNC
LV
Exit
Figure 5.- TV mode selection.
Use keys
[6] to choose the information you want to be displayed on-screen. Press key ENTER [5] or key MODE [23] to activate
the selected display mode.
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4.9.1.1.2.- Selecting TV Mode: TV, LV, SY (TV MODE)
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The operation modes available are:
TV:
Monitor operating as a conventional television set.
TV+LV:
Monitor operating as a conventional television set, with a level indicator on the upper part of the screen (the
analogue bar).
TV+LV+SY:
Monitor operating as a conventional television set, with a level indicator and the line synchronizing pulse
displayed on the screen.
LV:
Signal level indication on the upper part of the screen (analogue bar).
Operation in TV+LV+SY Mode
This function permits to display the line synchronising pulse corresponding to a tuned signal on the monitor.
To view the synchronisation pulse press key MODE [23], use keys
[23] or key ENTER [5].
[6] to select TV + LV + SY mode, and then press key MODE
The monitor is divided into three sections. In the top section an analogue bar appears which indicates the level of the signal received (79
dBµV in figure 6 example). On the left side the line synchronising pulse is represented as it would appear on the screen of an oscillosco pe.
On the lower side the TV picture is shown.
60
70
80
90
100
Figure 6.- Line synchronism + level + TV (TV+LV+SY).
Starting from the line synchronism representation, it is possible to perform a qualitative analysis of the TV picture delivered to the end
user.
4.9.1.2.- Measuring the Video / Audio Ratio (V/A)
In the Video/Audio measurement mode, the screen displays the following information:
VIDEO/AUDIO
15.0 dB
VIDEO CARRIER:
Frequency
=
Level
=
519.25 MHz
60.2 dBuV
AUDIO CARRIER:
Frequency
=
Level
=
5.50 MHz
45.2 dBuV
Figure 7.- Video/Audio rate measurement.
In addition to the video carrier / audio carrier ratio (15.0 dB in previous figure) this also shows the frequency or channel, depending on the
tuning mode selected, and the level of the video carrier and audio carrier.
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4.9.1.3.- Measuring the Carrier / Noise Ratio (C/N)
The MTD 120 offers two ways to make this measurement:
Auto:
The MTD 120 defines the frequency where noise level is measured automatically.
Reference noise:
The user defines the frequency where noise level is measured (by means of the Reference noise function). This frequency
will be used to measure noise level for all channels.
To select the measuring method activate the TV mode functions menu by pressing key ENTER [5], then use keys
[6] to select C/N
setup function and finally press key ENTER [5] again. The monitor will show a screen displaying two possibilities: C/N (Auto) and C/N (Reference
noise), then use keys
[6] to select the desired option and finally press key ENTER [5] to confirm.
When selecting the C/N (Reference noise) mode it is necessary to define the noise frequency: access the functions menu and now use keys
[6] to select Reference noise function and finally press ENTER [5] again. A screen titled REFERENCE NOISE will be displayed showing
the noise frequency in use. To change it press key SHIFT [31], the current frequency value will disappear and, using the keyboard, you will be able to
enter the new reference noise frequency in MHz and with two decimals figures. This frequency also can be modified in the Spectrum operation mode
(see 4.10.2.2. C/N (Referenced Measurement).
The MTD 120 carries out C/N ratio measurement in four different ways, according to the carrier type and the band in use:
A) Terrestrial band, analogue carrier
Carrier level is measured using a quasi-peak detector (230 kHz BW). Noise level is measured with an average detector and corrected to refer
it to channel bandwidth (according to the standard in use).
B) Terrestrial band, digital carrier
Both measurements are done with an average detector (230 kHz) and the same corrections are introduced on them (bandwidth corrections).
C) Satellite band, analogue carrier
Carrier level is measured using a quasi-peak detector (4 MHz BW). Noise level is measured with an average detector (4 MHz) and corrected
to refer it to channel bandwidth.
D) Satellite band, digital carrier
Equivalent to case B but now using the 4 MHz BW filter.
On selecting the Carrier / Noise measurement mode the screen displays the following information:
C/N (Auto)
20.1 dB
1345.5 MHz
64.1 dBuV
1329.5 MHz
44.1 dBuV
32.0 MHz
Figure 8.- Carrier-to-noise ratio measurement (Satellite band, analogue signal).
As well as the video carrier / noise level ratio (20.1 dB in previous figure), the frequency or channel (depending on the tuning mode
selected) and the level of the video carrier and noise level are also shown.
When measuring channels in the satellite band or digital channels, to measure the C/N ratio correctly, the bandwidth of the channel must be
defined previously, using the Channel BW function on the TV mode functions menu.
IMPORTANT REMARK
To measure digital channels C/N ratio in Auto mode it is indispensable to tune channel at its central frequency.
IMPORTANT REMARK
In the case of an analogue terrestrial signal, when C/N (Auto) mode is selected, the MTD 120 performs an in-channel
measurement, this involves that C/N value will take several seconds to stabilize (six seconds at the most). An arrow below the C/N
readout represents the measurement cycle and it is necessary to wait the arrow passes twice on the same point to guarantee a
correct measurement.
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VIDEO CARRIER:
Frequency
=
Level
=
NOISE:
Frequency
=
Power
=
Channel BW =
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4.9.1.4.- Measuring the Power of Digital Channels (Channel power)
The MTD 120 offers two different methods to measure digital channels power, according to the active operation mode: Automatic method
in TV mode and Integration method in Spectrum mode. The Automatic method measures digital channel power in the measurement filter
bandwidth and estimates total channel power assuming that spectral density is uniform throughout channel bandwidth. On the other hand, the
Integration method takes into account signal spectral distribution so measurement is more accurate (see 4.10.2 Selecting the
Measurements Mode). The obtained readouts using these methods may differ some dBs, specially when the digital signal is degraded.
Digital channel power
Spectrum
TV mode
Channel BW
Channel BW
Marker
Marker
Mesure BW
Power measurement by integration method
Power measurement by the automatic method
Figure 9.- Measuring digital power.
On selecting the CHANNEL POWER measurement mode, the screen displays the following information:
CHANNEL POWER
45.8 dBuV
DIGITAL CARRIER:
Frequency
=
538.00 MHz
BANDWIDTH PARAMETERS:
Channel BW =
8.00 MHz
Measure BW =
230
KHz
Figure 10.- Digital channel power measurement.
In addition to the power of the digital channel (45.8 dBµV in previous figure) this also shows the tuning frequency or channel, depending
on the tuning mode selected, and the parameters regarding bandwidth: Channel BW and measuring filter bandwidth (Measure BW).
For the power measurement of a digital channel to be correct it is essential to have previously defined the channel bandwidth using the
Channel BW function, in the TV mode functions menu (see section '4.9.2.11 Channel Bandwidth’).
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4.9.2.- TV Mode Functions Menu
In TV operation mode, press key ENTER [5] to access the functions menu of the TV mode:
FUNCTIONS
FUNCTIONS
Band switching
System & Standard
Battery & Lnb
Data logger
Clock
Input video
Band switching
System & Standard
Battery & Lnb
Data logger
Clock
Input video
Figure 11.- TV mode functions menu.
Use keys
[6] to choose the different functions: pressing key
active option moves upwards while pressing key
active option
moves downwards. The downwards or upwards facing arrow at the bottom or top-left hand side of the functions menu indicates there are
more menus which can be accessed by pressing keys
[6].
Below we describe the use of each function and its range of values.
4.9.2.1.- Selection of the RF Band: (Band switching)
Permits to switch from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa.
4.9.2.2.- Selection of the TV System and Standard (System & Standard)
This function enables the television system and standard to be changed. The standards which can be selected depend on the band in use
(terrestrial or satellite channels). To change the standard access the TV mode functions menu, then use keys
[6] to select the System
& Standard function and press key ENTER [5]. A fold down menu will appear listing the following options:
Satellite band
PAL-B/G
PAL
PAL-D/K
SECAM
PAL-I
NTSC
PAL-M
Digital
ENGLISH
Terrestrial bands
PAL-N
SECAM-B/G
SECAM-L
SECAM-D/K
NTSC-M
Digital
Use keys
[6] to select the desired standard and press key ENTER [5] to activate it.
If a digital channel is selected, whether terrestrial or satellite, for the measurement of the level and the carrier-to-noise ratio to be correct,
the bandwidth of the channel must be defined, using the Channel BW function of the functions menu.
The following table shows the features of the analogue terrestrial channel standards.
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System
B
D
G
H
I
K
L
M
N
Lines/frame
625/50
625/50
625/50
625/50
625/50
625/50
625/50
525/60
625/50
User Manual
Channel Bandwidth Video/sound separation
7 MHz
5,5 MHz
8
6,5
8
5,5
8
5,5
8
6,0
8
6,5
8
6,5
6
4,5
6
4,5
Video mode
Neg
Neg
Neg
Neg
Neg
Neg
Pos
Neg
Neg
Audio mode
FM
FM
FM
FM
FM
FM
AM
FM
FM
Table 2.- Selectable terrestrial analogue standards and their characteristics.
4.9.2.3.- Batteries and External Units Power Supply (Battery & Lnb)
This function allows you to check the charge state of the batteries, as well as the supply current and voltage of the external units. From
the TV operation mode, simply press key ENTER [5] select the Battery & Lnb function and press key ENTER [5]again. You will see a screen
like the following one:
BATTERY: 6.1 V
L Bat
V LNB : 12.6 V
I LNB : 200 mA
Figure 12.- Battery&Lnb function.
The top part of the screen displays the battery voltage (6,1 V in previous figure), both numerically and with a bar graph. The arrow
labelled L Bat below the horizontal bar signals the low battery level where the battery should be charged. When batteries are fully charged,
battery voltage indication is 6.1 V or higher.
The bottom of the screen shows the voltage supplied to the external units (V LNB, 12.6 V in the figure above) and the current supplied
(I LNB, 200.0 mA in the example).
To leave this function press key ENTER [5].
4.9.2.4.- Data Logger Function
The Data logger function allows the user to carry out, store and/or print out up to 9801 measurements in a fully automatic way. It may be
understood as a measurement matrix whose columns address the 99 measuring configurations (defined in the 99 memories of the
equipment) and whose lines permit to store 99 measurements for every measuring configuration (conducted in different points of the system
or in the same point on different times).
Before to proceed to take measurements by means of the Data logger function it is necessary to store the measuring configuration/s in
the memory by using the Store function (see paragraph 4.12.1).
To select the Data logger function activate the TV mode functions menu, by pressing key ENTER [5] when in the TV operation mode.
Then, use keys
[6] to select the Data logger field and press key ENTER [5], the DATALOGGER screen will appear automatically.
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DATALOGGER
•> Config
1
49.8
...
...
...
...
1
2
3
4
5
• Run
• Exit
2
55.2
...
...
...
...
3
53.4
...
...
...
...
Figure 13.- DATALOGGER screen.
As you can see in the previous figure, the main screen of the Data logger function has three functions: Config (Configuration), Run and
Exit. Below these three functions is the measurements matrix, three columns and five rows are simultaneously displayed (in the previous
figure the data logger has three stored measurements, one for each of the first three memories).
To access the various screen functions or fields press key SHIFT [31] repeatedly.
4.9.2.4.1.- Configuring the Data Logger Function
The configuration menu of the Data logger function allows you to choose between taking and/or printing measurements, programming
the MTD 120 to take measurements at a pre-determined time, defining the time interval between measurements, erasing all measurements
stored in the Data logger function, and automatically deactivating all the measurement configurations.
To define the configuration of the Data logger function press key SHIFT [31] repeatedly until you have selected the Config field and then
press key ENTER [5]. The configuration screen of the Data logger function will then appear.
DATALOGGER
Measure: On
Print: Off
Start acquisition time:
.. : .. : .., .. / ..
Measure interval: 00 : 15
Unselect
ENGLISH
Clear
Figure 14.- Configuration of the DATA LOGGER function
After an interval of half a minute without the MTD 120 controls being touched, it will automatically return to the Data logger function main
screen.
1.- TO MEASURE, PRINT OR MEASURE AND PRINT?
First of all, the user must indicate whether he wants to take measurements or to print them, or to do both at the same time. To do this,
press key SHIFT [31] repeatedly until positioned in the Measure field. Then use keys
[6] to activate (On) or deactivate (Off) the
measurement function and press key SHIFT [31]. The next step is to activate or deactivate the measurement printing function. To do this, use
the key SHIFT [31] to position the cursor in the Print field and activate it (On) or deactivate it (Off) using keys
[6] and pressing key
ENTER [5] validate the new state.
2.- PROGRAMMING THE ALARM
To program the instrument to take measurements and/or print-outs at a specific time, you must define the time and date the
measurements are to be taken (Start acquisition time). If this field is not defined the acquisition of measurements will have to be activated
manually (see section '4.9.2.4.3 Taking Measurements'). When programming the alarm be sure to have checked that the date and time have
been correctly defined beforehand (Clock function, paragraph 4.9.2.5) and to have selected previously one measurement to be taken at
minimum (see section '4.9.2.4.2 Selecting the Measurements to be Taken').
To define the starting time of measurement acquisition repeatedly press key SHIFT [31] until the Start acquisition time field blinks, then
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press key ENTER [5]. This will lead to a screen like the one shown below:
ALARM
Off
Hour
Minute
Second
: 07
: 00
: 00
Day
Month
: 01
: 05
Time
12:03:16
30/04/1999
Figure 15.- Defining the starting time of measurement acquisition.
The first line of this screen tells you if the alarm function is on (ALARM On) or not (ALARM Off), followed by the date and time the alarm
has been set for, and the last line shows the current time and date.
Repeatedly pressing key SHIFT [31] cyclically activates the different fields in the following order: Hour, Minute, Second, Day, Month and
Alarm (alarm state). To alter any of these simply activate it, using keys
[6] and press key SHIFT [31] again. Once you have updated
all the alarm fields, press key ENTER [5] to validate them and exit the screen.
If before activating the alarm (ALARM On) no measurement matrix cell has yet been activated (see section '4.9.2.4.2 Selecting the
Measurements to be Taken'), the bottom of the screen will show the error message "NOT CELLS SEL." (No cells have been selected)
followed by "DL STOPPED" (Data Logger deactivated).
On reaching the time defined in the Start acquisition time field, the instrument will switch itself on (if it was switched off) or go to the
Data logger mode (if switched on) to automatically take the measurements and/or produce the print-out.
3.- MULTIPLE MEASUREMENTS: INTERVAL BETWEEN MEASUREMENTS
In the case of having to take multiple measurements at different times the Measure interval will have to be defined. This field specifies
the time interval between measurements/print-outs. To define it, from the Data logger configuration screen, repeatedly press key SHIFT [31]
until the section dealing with time in the Measure interval field has been activated, define the hours by using keys
[6], then press key
SHIFT [31] again to go to the minutes field and define these in the same way. Finally press key SHIFT [31] again to validate the defined time
interval.
You can make as many acquisitions as there are activated rows in the measurement matrix (if only one row has been activated, then only
one measurement will be taken).
In the case where the Data logger function has been programmed to take more than one measurement in the time domain, i.e. more than
one row has been activated and the acquisition interval is greater than four minutes, then every time an acquisition is made the instrument will
reprogram the alarm for the next measurement. Then it will switch itself on three minutes before the time defined in the Measure Interval field
in order to warm up and ensure the highest accuracy.
4.- ERASING MEASUREMENTS STORED IN THE DATA LOGGER AND AUTOMATIC DEACTIVATION OF ALL THE CELLS.
The configuration screen also allows you to erase all the measurements stored in the Data Logger function, as well as automatically
deactivating all the activated measurement configurations. To erase the stored measurements select the Clear field and press key ENTER
[5]. To deactivate the measurement configurations select the Unselect field and press key ENTER [5].
5.- EXITING THE CONFIGURATION SCREEN
To exit the Data logger function configuration screen press key ENTER [5].
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4.9.2.4.2.- Selecting the Measurements to be Taken
Once the Data logger function has been configured, activate the measurement configuration(s) (columns) which you would like to use.
The headings of the measurement matrix columns of the Data logger function coincide with the number of memorised measurement
configurations, simply place the cursor over each column and you will see the more important parameters displayed at the bottom of the
screen (name assigned to the memory position, frequency/channel, measurement mode and units of measurement).
To activate the measurement configurations repeatedly press key SHIFT [31] until the cursor is placed on the columns field, next
pressing keys
[6] until it is positioned in the column (memory) that you wish to activate and press key ENTER [5]. The activated
columns are more brilliant than the non activated ones. To deactivate a column follow the same steps as in activating it.
To activate rows where you wish to store measurements use key SHIFT [31] to place the cursor on the rows field, then press keys
[6] until it is over the row you want to activate and press key ENTER [5]. The activated rows are more brilliant than the non activated
ones. To deactivate a row follow the same steps as in activating it. In the case of activating more than one row, the time interval between the
measurement of each row is determined by the Measure interval parameter defined in the configuration screen (1 minute by default).
4.9.2.4.3.- Taking Measurements
In addition to execution by alarm (see section '4.9.2.4.1 Configuring the Data Logger Function') there are three more ways to take
measurements:
a) Acquisition over a time period.
The measurement defined in a memory (column) will be taken as many times as there are activated rows, as specified by the time
interval between measurements defined in the configuration menu (Measure interval).
Process: place the cursor on the column you want and press key ENTER [5] until the first active cell blinks. If no measurement matrix
row has been previously activated, the bottom of the screen will show the error message "NOT CELLS SEL." (No cells selected).
b) Acquisition of different measurements at the same moment.
Multiple measurements in a row will be taken, as specified by the measurement configurations defined in all the activated columns.
Process: place the cursor on the row you want and press key ENTER [5] until the active cells blink. If no measurement matrix column
has been previously activated, the bottom of the screen will show the error message "NOT CELLS SEL.".
c) Multiple acquisitions.
All the measurements defined by all the activated rows and columns will be taken, in the case where more than one row has been
activated the time interval between measurements will be that defined in the Measure interval field of the configuration menu.
Process: select the Run function and press key ENTER [5]. If no measurement matrix element has been previously activated, the
bottom of the screen will show the message "NOT CELLS SEL.".
If any key is pressed during the acquisition process, the acquisition process will abort and the screen will display the message "DL
STOPPED" (Data Logger deactivated).
To exit the Data logger function select the Exit field using key SHIFT [31] then press key ENTER [5].
4.9.2.4.5.- Examples of Data Logger Function Applications
The Data logger function has many applications such as channel equalisation and measuring signal attenuation at each pickup.
Band Equalisation (frequency acquisition)
For this application you will need to use a noise generator as the signal source in the place of a receiver antenna. If, lets say, you wish to
verify equalisation on the VHF band, then:
1. Define the following tuning frequencies at 8 memory positions: from 50 to 450 MHz in 50 MHz steps. The measurement to be taken will
be the level measurement.
2. In the Data logger function, activate the columns related to the memories defined in the previous step.
3. Next place the cursor on the row where you want to store the measurements and press key ENTER [5] until the first of the cells blinks.
The measurements obtained will allow you to verify if the signal level is uniform across the entire band.
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4.9.2.4.4.- Exiting the Data Logger Function
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Measuring signal level fluctuation at a pickup (acquisition over a time period)
1. Define the acquisition time interval Measure interval (1 h for example).
2. Activate a column (a measurement configuration you consider significant).
3. Activate the necessary number of rows to be able to perform the study over the decided upon period of time, taking into account the
previously defined acquisition interval (e.g. for a 24 hour study with an acquisition interval of 1 h you will need to activate 24 rows).
4. Finally place the cursor on the activated column and press key ENTER [5] until the first active cell blinks.
The report obtained will allow you to guarantee the correct operation of the installation.
4.9.2.5.- Clock
An internal clock permits to record date and hour of data acquisitions.
To modify the time/date access the TV mode functions menu, press keys
[6] to select the Clock function and press key ENTER
[5] to activate it. The monitor will show a screen labelled CLOCK displaying the hour, minute, second, day, month and year.
To alter any parameter repeatedly press key SHIFT [31] until the parameter you want to modify appears shadowed, then press keys
[6]. If you want to alter more parameters repeatedly press key SHIFT [31] again. To validate the changes made and exit press key
ENTER [5].
4.9.2.6.- Input Video
The Input video function enables Scart connector signals to be controlled. There are three possibilities:
Scart Auto
Normal Scart operation
Scart On
External video operation mode
Scart Off
Scart deactivated
To select the Scart operation mode, access the TV mode functions menu, press keys
[6] to the Input video function and press
key ENTER [5] to activate it. The monitor will show a screen labelled INPUT VIDEO displaying the three available options (as well as the Exit
option). Press keys
[6] to select the mode you require, then press key ENTER [5] to activate it.
4.9.2.7.- Selecting the Channels Table (Channel set)
The MTD 120 comes with twelve stored channel tables as standard (four for terrestrial television and eight for satellite), for greater
adaptability to the selection requirements of different countries or zones. See the channel-frequency table in appendix A of the manual.
To modify one channel table, access the TV mode functions menu, press keys
[6] to select the Channel set function and press
key ENTER [5] to activate it. The monitor will then show the CHANNEL SET screen. Press keys
[6] to select the desired table and
then presss key ENTER [5] again to activate it.
4.9.2.8.- Measurement Units
The MTD 120 offers three measurement units to measure level and channel power: dBµV, dBmV and dBm.
To select the units of measurement, access the TV mode functions menu, press keys
[6] to select the Units function and press
key ENTER [5] to activate it. The monitor will show a screen labelled UNITS displaying the three available options (as well as the Exit option).
Press keys
[6] to select the units you require, then press key ENTER [5] to activate it.
4.9.2.9.- Power Off Mode (Manual power)
The MTD 120 offers two power-off modes: Manual and Automatic (unit disconnects automatically after 15 minutes without operating on
any control).
To select the power-off mode, access the TV mode functions menu, press keys
[6] to select the Manual power function and press
key ENTER [5] to activate it. The monitor will show a screen labelled POWER OFF displaying the two available options (as well as the Exit
option). Press keys
[6] to select the power-off mode you require, then press key ENTER [5] to activate it.
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4.9.2.10.- C/N setup
To measure C/N the MTD 120 offers two different modes in TV mode:
C/N (Auto)
The MTD 120 defines automatically the frequency where noise level is measured, according with:
fnoise = ftuning - 1/2 Channel BW
C/N (Reference noise)
The user defines the frequency where noise level is measured (by means of the Reference noise
function). This frequency will be used to measure noise level for all channels.
To select C/N mode, access the TV mode functions menu, press keys
[6] to select the C/N setup function and press key ENTER
[5] to activate it. The monitor will show a screen labelled C/N SETUP displaying the two available options (as well as the Exit option). Press
keys
[6] to select the mode you require, then press key ENTER [5] to activate it.
4.9.2.11.- Channel Bandwidth (Channel BW)
To measure the power and C/N ratio of digital channels, as well as the C/N ratio of satellite band channels, you first need to define the
channel bandwidth.
To modify the bandwidth access the TV mode functions menu and select the Channel BW function, press key ENTER [5] to activate it.
The CHANNEL BANDWIDTH screen will be displayed. To alter the bandwidth value press key SHIFT [31], the bandwidth will disappear and,
using the keyboard, you will be able to enter the new digital channel bandwidth in MHz and with two decimals.
4.9.2.12.- LNB Local Oscillator Frequency (Lnb local osc)
This option only affects reception of satellite band signals when using the channel tuning mode. This function defines the LNB local
oscillator frequency used in the installation where the MTD 120 has been connected. Given that the MTD 120 satellite channel tables have
been defined in the Ku band and the MTD 120 tunes in IF (like all satellite receivers) the LNB local oscillator frequency has to be defined to
correctly tune the channel mode.
To modify this parameter access the TV mode functions menu (satellite band), press keys
[6] to select the Lnb local osc function
and press key ENTER [5] to activate it. The monitor will show a screen labelled LNB LOCAL OSCILLATOR displaying the current value of
the LNB local oscillator frequency. To alter this value press key SHIFT [31], the current value will disappear and the new value can now be
entered using the keyboard.
The frequency of the LNB local oscillator is expressed in MHz, with 5 figures for the whole part, a decimal point and a decimal figure
(which acts as confirmation). For example, to select 9 GHz the number 9000.0 has to be entered. Values must be defined between 8000.0
and 12000.0.
4.9.2.13.- Video Polarity
To modify the polarity access the TV mode functions menu (satellite band), select the Video Polarity function, and press key ENTER [5]
to activate it. The monitor will show a screen labelled POLARITY displaying two possibilities: Positive Video and Negative Video. Pressing
keys
[6] mark the option you require and finally press key ENTER [5] to activate it.
4.9.2.14.- NICAM Channel
Use this function to verify NICAM sound modulations in stereo and dual, you can also select the sound channel coming over the speaker.
To change the decoded channel access the TV mode functions menu, select the Nicam channel function, and press key ENTER [5] to
activate it. The monitor will show a screen labelled NICAM offering two possibilities: Channel A and Channel B. Press keys
[6] to
select the desired option and finally press key ENTER [5] to activate it.
4.9.2.15.- Search Level
Use this function to modify the threshold level of the automatic station search. To change the level place the cursor on the Search level
field and press key ENTER [5]. The monitor will display a window showing the current value of the search level, to alter it press key SHIFT
[31] and enter the new value on the keyboard. Confirmation is automatic on entering the second digit.
4.9.2.16.- Teletext
When the Teletext function is selected, Teletext information appears on the monitor if a transmitter with this information is tuned. The first
page to appear on the screen is always page 100. If Teletext data is received, a counter located on the upper edge of the screen indicates the
page that is being processed. To change active page press key SHIFT [31], and introduce the new number using the numeric keyboard (third
digit acts as confirmation).
If the page requested is not included in the Teletext service of the transmitter, the search will continue indefinitely. In such a situation the
user can halt the search process, either by entering a new page number or by exiting the Teletext function pushing any control relative to
another function.
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This option affects reception of SAT (satellite) band signals. It allows selection of either negative and positive video polarity.
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The Teletext function is especially valuable for the final optimization process in TV installations. Any interference or reception through
indirect beams generates digital in the digital information of the Teletext, which are highly visible as erroneous characters on the screen.
4.9.2.17.- DiSEqC (*) Command Generator
DiSEqC ('Digital Satellite Equipment Control') is a communication protocol between the satellite receiver and the accessories of the
installation (switches, LNBs, etc.) proposed by Eutelsat, with the aim to standardize the diversity of switching protocols (13 - 15 - 18 V, 22
kHz, 60-400 Hz) and to satisfy the demands of the digital TV installations.
To define and/or to send a DiSEqC commands sequence, from the TV operation mode, press key ENTER [5], select the DiSEqC function
using keys
[6] and press key ENTER [5] again. A screen like next one will appear:
DiSEqC 1.2
Sat A/B
..........................
..........................
..........................
..........................
..........................
Page: 1/1
A
....
....
....
....
....
Send
Exit
Figure 16.- DiSEqC commands screen.
DiSEqC screen is divided in 3 areas: the field to edit the DiSEqC commands sequence (only command Sat A/B in previous figure),
Send/Clear functions and Exit.
To define the DiSEqC commands sequence press key SHIFT [31] repeatedly until cursor is positioned on one line of the commands
sequence (the line will blink). If cursor has been placed on the first empty line, Sat A/B command will appear (first DiSEqC command of table
3). To select a different command press keys
[6] until the desired command appears and then press key ENTER [5].
Some DiSEqC commands need to define an associated parameter (i.e. On/Off, a numerical value, A/B...), when any of these commands
is selected first option for the associated parameter appears automatically at its right, to change it press keys
[6] and to validate it
press key ENTER [5] (see DiSEqC commands table).
Once the DiSEqC command is defined, the cursor will pass to the following line, if you want to define a new command proceed as for the
first one, if you do not want to add any command press key SHIFT [31].
After the commands sequence is created it is possible to modify it. To modify the sequence press key SHIFT [31] repeatedly until you
have positioned the cursor on the command you want to make the change and then press key ENTER [5]: Insert function will appear on the
screen, by pressing keys
[6] it is possible to select Delete and Edit functions. Once the desired function appears on the screen
(Insert, Delete or Edit) press ENTER [5].If you select Delete function the command will be removed from the sequence, if you select Insert or
Edit functions, you must define the new command as previously described.
Once commands sequence is defined, to send it to the peripherals press key SHIFT [31] repeatedly until you have selected the Send
function and then press key ENTER [5]. At the same time as DiSEqC commands are sent these appear on the lower side of the monitor. If
Send function does not appear on the monitor, place the cursor over the Clear function and press keys
[6].
It is possible to delete the whole of the commands sequence, to do this press key SHIFT [31] repeatedly until you have selected the Clear
field and then press key ENTER [5]. If Clear function does not appear on the monitor, place the cursor over the Send function and press keys
[6].
To exit DiSEqC function place the cursor over the Exit field and then press key ENTER [5].
REMARK: When disconnecting the unit, the commands sequence will NOT be lost.
Next table shows the DiSEqC commands available:
(*) DiSEqC™ is a trademark of EUTELSAT.
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Character
General
Destined
Switch
Non-destined
Switch
Positioner
User Manual
Command
Sat A/B
Reset
Power ON
Standby
L.O. frequency High/Low
H/V polarisation
Position A/B
Sw. option A/B
Switch 1
Switch 2
Switch 3
Switch 4
Halt
Disable limits
Enable limits
Limit East
Limit West
Drive E. seconds
Drive E. steps
Drive W. seconds
Drive W. steps
Store position
Goto position
Associated parameter
A/B
------H/V
A/B
A/B
A/B
A/B
A/B
A/B
--------1 to 127
1 to 128
1 to 127
1 to 128
1 to 255
1 to 255
Tabla 3.- DiSEqC commands.
4.9.2.18.- Beep
This function allows the user to switch the audible indicator ON and OFF. To do this, first select the TV mode functions menu, then
choose the Beep function using the keys
[6] and press key ENTER [5]. The monitor will show the BEEP screen and by pressing keys
[6] it will be possible to select between Beep ON or Beep OFF. To validate press key ENTER [5] again.
4.9.2.19.- Equipment Information
This function displays information on the instrument. To activate it, press key ENTER [5], while in the TV operation mode. Press keys
[6] to select the Equipment Info. function and press key ENTER [5]. The monitor will show the EQUIPMENT INFO. screen listing
several informations such as the instrument serial number (Serial Number), the version of the control program (Version), etc.
ENGLISH
To exit the function press key ENTER [5].
4.9.2.20.- Exit
Exits from the TV functions menu.
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4.10.- Spectrum Analyser Operating Mode
The Spectrum Analyser mode allows the user to discover the signals present in the frequency band in quickly and easily and to make
measurements at the same time. To select it press key SPECT [21]. The monitor will show a picture like the one described in the next figure.
80
70
60
50
40
1992.0 MHz
56.9 dBuV
Figure 17.- Spectrum Analyser mode.
The horizontal lines define the signal level, the broken lines being 5 dB from the solid ones. The level of the top line (80 dB µV in previous
figure), named the Reference Level, can be altered using the Reference level function in the Spectrum Analyser mode functions menu
(section 4.10.1.3).
The signal level for each frequency is displayed vertically, the lower frequencies appearing at the left of the screen and the higher ones at
the right. The amplitude of the lobes is calibrated. In the example in previous figure the noise level is at around 37 dBµV and the lobe with the
highest signal level (second from the left) is at 64 dBµV.
The frequency range displayed (called span from hereon) can also be altered using the Spectrum Analyser mode functions menu.
A vertical broken line, called marker, appears on the spectrum display to identify the tuned frequency.
One of the applications of the MTD 120 operating as Spectrum Analyser is in the search for the best orientation and position of the
receiving antenna. This is particularly important in UHF. Because such frequencies are involved, with wavelengths ranging from 35 cm to 65
cm, if the antenna is shifted only a few centimetres, the relationship between the picture, chrominance and sound carrier frequencies change,
affecting the quality of the picture in the receiver.
If there is an excess of sound carrier, tearing or 'moiré' may appear on the screen due to the frequency beats between the sound,
chrominance and the picture frequencies.
If there is a chrominance carrier defect, then the television colour amplifier must function at maximum gain, which could result in noise
appearing all over the television screen with points of colour that disappear when the saturation control is reduced; in an extreme case, loss of
colour may occur.
4.10.1.- Spectrum Analyser Mode Functions Menu
In the Spectrum Analyser operation mode, pressing key ENTER [5] leads you to the next functions menu.
FUNCTIONS
Band switching
Span
Reference level
Dual marker
Sweep
Measure bandwidth
Figure 18.- Spectrum Analyser mode functions menu.
When press key
[6] active option moves upwards while press key
[6] active option moves downwards.
The downward pointing arrow at the bottom left of the menu means that there are more functions available, to view these press key
[6]. Below we describe the use of each function and its range of values.
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4.10.1.1.- Band Switching
Permits to swicth from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa.
4.10.1.2.- Span
This function enables selecting the displayed frequency range in Spectrum Analyser mode between Full (the entire band), 500 MHz, 200
MHz, 100 MHz, 50 MHz, 32 MHz, 16 MHz and 8 MHz (the latter two only in terrestrial bands).
To alter the span, select the functions menu, then press keys
[6] to select the Span function and press key ENTER [5]. The
screen will show a window with the spans which can be selected. Press keys
[6] to select the required span and activate it by pressing
key ENTER [5] again.
In Full mode the measuring filter bandwidth used to display the spectrum is always 1 MHz for terrestrial bands, and 4 MHz for satellite
band. For the other spans you can select the bandwidth using the Measure Bandwidth function on the same functions menu. (See section
'4.10.1.10 Bandwidth of the Spectrum Measuring Filter').
4.10.1.3.- Reference Level
The reference level corresponds to the level marked by the top horizontal line appearing on the Spectrum Analyser mode screen. This
function enables the reference level to be defined between 70 and 130 dBµV in 10 dB steps. The default reference level is 70 dBµV.
To alter the value of the reference level select the Spectrum Analyser mode functions menu, press keys
[6] to select the
Reference level function and press key ENTER [5]. The screen will show a window with the values which can be selected. Press keys
[6] to select the desired reference level and activate it by pressing key ENTER [5] again.
4.10.1.4.- Dual Marker/Single Marker
(Only for level measurements) This function enables two tuning markers (Dual marker) to be seen on the spectrum display. When you
choose this option you can select the active marker (Marker A or Marker B) or return to using only one marker (Single marker).
80
70
60
50
MHz :
dBuV :
1460.8
46.4
1632.0
59.4
171.2
13.0
Figure 19.- Spectrum Analyser mode with two tuning markers.
When you select the Dual marker function, the bottom of the screen displays the frequency of each of the two markers, the signal level
for each frequency and, on the far right, the frequency difference and the level between them.
4.10.1.5.- Sweep
Enables you to choose the sweep speed of the Spectrum mode between High Resolution (slow sweep, high precision) and Fast (fast
sweep, low precision).
To modify the sweep speed select the Spectrum Analyser mode functions menu, then press keys
[6] to select the Sweep function
and press key ENTER [5]. The screen will show a window containing all the values which may be chosen. Press keys
[6] to select the
desired speed and activate it by pressing key ENTER [5] again.
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4.10.1.6.- Reference Noise
(Only in C/N measurements). Permits to define the frequency where noise level will be measured.
To modify the frequency where you want to measure noise level, accede to the menu functions and select the Reference noise function
then, again in the Spectrum mode, press keys
[6] to place the marker on the frequency where you want to measure the noise level or
well, press key SHIFT [31], current reference noise frequency will be erased and using the keyboard introduce the new value. Finally accede
to the functions menu again and execute the Carrier function so that you can tune new carrier frequencies by pressing keys
[6] .
4.10.1.7.- Channel Bandwidth
(Only in Channel Power measurements). Permits to define channel bandwidth.
To modify the channel bandwidth, that is to say the power integration limits, accede to the menu functions and select the Channel
bandwidth function then, again in the Spectrum mode, press keys
[6] to modify it or well press key SHIFT [31], current channel
bandwidth will be erased and using the keyboard introduce the new value. Finally accede to the functions menu again and execute the
Marker function so that you can tune new carrier frequencies by pressing keys
[6] .
4.10.1.8.- Marker
(Only when measuring Channel power and after defining the Channel bandwidth). Permits to change the tuning frequency by means of
keys
[6].
4.10.1.9.- Carrier
(Only when measuring C/N Referenced and after defining the Reference noise). Permits to change the tuning frequency by means of
keys
[6].
4.10.1.10.- Bandwidth of the Spectrum Measuring Filter (Measure bandwidth)
The frequency resolution of the Spectrum Analyser mode is determined by the bandwidth of the measuring filter when displaying the
spectrum. This parameter is fundamental given the increasing density of channels present in all TV transmission systems.
To alter the bandwidth of measurement select the Spectrum Analyser functions menu, then press keys
[6] to select the Measure
bandwidth function and press key ENTER [5]. The screen will show a window displaying the values which can be selected. Pressing keys
[6] to select the chosen bandwidth and activate it by pressing key ENTER [5] again.
The choice of bandwidth is:
Terrestrial channels:
230 kHz or 1 MHz
Satellite channels:
230 kHz or 4 MHz
Filters with the greatest bandwidth (4 MHz y 1 MHz) allow you to take more stable measurements, as well as being able to distinguish
between analogue and digital carriers. The 4 MHz filter is ideal for level measurements on the satellite band. The 230 kHz filter is
recommended for measuring terrestrial television, cable television and MMDS signals. It also allows you to identify smaller bandwidth signals
such as NICAM sound carriers (terrestrial analogue channels), to detect the beacon signal on VSAT, the separation between the audio FM
carrier, and between the stereo sub-carriers in television.
4.10.1.11.- Selecting the Channels Table (Channel set)
See 4.9.2.7 section.
4.10.1.12.- Batteries and External Units Power Supply (Battery & Lnb)
See 4.9.2.3 section.
4.10.1.13.- Exit
Exits from the Spectrum Analyser function menu.
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4.10.2.- Selecting the Measurement Mode
The Spectrum Analyser mode permits to make different measurements at the same time you see the signals present in the band. The
types of measurements available are:
Terrestrial band - Analogue channels:
Level
Level measurement of the currently tuned carrier.
C/N
Video carrier to noise ratio referenced to a noise frequency defined by the user through the Reference Noise
function.
Terrestrial band - Digital channels:
Channel power
Integration method. It consists of scanning the entire channel, calculating the contribution of each portion of the
spectrum to the whole.
C/N
Referenced: Channel level to noise ratio referenced to a noise frequency defined by the user through the Reference
Noise function.
Satellite band - Analogue channels:
Level
Level measurement of the currently tuned carrier.
C/N
Video carrier to noise ratio referenced to a noise frequency defined by the user through the Reference Noise
function.
Satellite band - Digital channels
Channel power
Integration method.
C/N
Referenced: Channel level to noise ratio referenced to a noise frequency defined by the user through the Reference
Noise function.
Like in the TV mode, to select the type of measure, press key LEVEL [22], then press keys
finally press key ENTER [5] or key LEVEL [22] to activate the new measurement mode.
[6] until desired mode is marked and
4.10.2.1.- Measuring Carrier Levels (Level)
4.10.2.2.- Measuring the Carrier / Noise ratio (C/N Referenced)
The Carrier/Noise ratio in Spectrum mode is always referenced to a noise frequency defined by the user.
Imagine a situation like the one shown in the next figure: a digital channel (8 MHz BW) adjacent to an analogue channel. When measuring
C/N for the digital channel in TV mode using the Auto setup, the analogue channel may interfere in the noise measurement (given that the
noise level is measured at fnoise = ftuning - 1/2 Channel BW= 650 MHz - 4 MHz = 646 MHz) so under this situation it is recommended to make
the measurement in Spectrum Analyser mode and to define manually the frequency where we want to measure noise (obviously a
frequency where no signal is present); i.e. in the next figure noise is defined to be measured at 655 MHz.
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(Only for analogue channels). When selecting this mode on the lower part of the image appears the tuned frequency (or channel) and the
signal level at this frequency. If dual marker function is selected, tuned frequency and signal level are showed for each one of the markers
and, on the far right, the frequency difference and the level between them.
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Channel BW
Carrier
Reference noise
70
60
50
40
30
Carr.: 650.00 MHz
Power: 44.0 dBuV
Noise: 655.0 MHz
C/N: 12 dB
Figure 20.- Carrier to Noise measurement in Spectrum mode (digital channel).
To define the frequency to measure the noise, select the Reference noise function in the Spectrum functions menu and press key
ENTER [5]. Next, again in the Spectrum mode, press keys
[6] to place the marker on the frequency where you want to measure noise
level or press key SHIFT [31], current reference noise value will be erased and using the keyboard introduce the new value. Finally accede to
the functions menu again and execute the Carrier function so that you can tune new carrier frequencies by keys
[6].
When C/N measuring mode is selected, on the lower part of the image appears the tuned frequency/channel ( Carr.), the noise frequency
(Noise), the carrier Level (if analogue mode is selected) or the channel Power (if digital mode is selected) and the carrier to noise ratio (C/N).
4.10.2.3.- Measuring the Power of Digital Channels (Channel Power)
In the Spectrum Analyser mode the MTD 120 measures digital channel power using an Integration method between channel limits
which are defined by the user. To show the interest of this method, imagine a spectral distribution like the one shown in the following figure
(channel bandwidth is 8 MHz defined by the markers). If channel power is measured in TV operation mode different readouts will be obtained
depending on the tuned frequency (measurement filter bandwidth is 230 kHz), if tuning is shifted from 759 MHz to 762 MHz reading will
increase in several dB.
Channel bandwidth
Marker
80
70
60
50
40
760.00 MHz
Channel Power:
Channel BW: 8.00 MHz
55.0 dBuV
Figure 21.- Channel power measurement in Spectrum Mode.
When measuring Channel power, on the lower part of the image appears the tuned frequency (or channel), the channel bandwidth
(Channel BW) and the Channel Power.
To measure the channel power, first of all it is necessary to define channel bandwidth, that is to say to set the limits of the integration:
select the Channel bandwidth function in the functions menu and then, again in the Spectrum mode, press keys
[6] to modify it or
well press key SHIFT [31], current channel bandwidth will be erased and using the keyboard introduce the new value. Finally accede to the
functions menu again and execute the Marker function in order you can tune new carrier frequencies, then when pressing keys
[6],
the tuning marker and the channel bandwidth limits will shift together.
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IMPORTANT REMARK
To measure digital channels power correctly it is indispensable to tune channel at its central frequency and to define channel
bandwidth.
4.11.- Selecting the Sound Mode (Sound)
From the TV operating mode, analogue mode, press key SOUND [26]. The screen will show the SOUND menu with the types of sound
available. Pressing keys
[6] choose the type of sound you wish and then press key SOUND [26] or the key ENTER [5] to activate it.
Table 4 shows the different options for the sound mode.
Type
4.50
5.50
5.74
5.80
6.00
6.50
6.65
7.02
NTUN
Function
Sound carrier 4.5 MHz above the picture carrier
Sound carrier 5.5 MHz above the picture carrier
Selects the second carrier in DUAL or STEREO transmissions,
at 5.74 MHz of the picture carrier
Sound carrier 5.8 MHz above the picture carrier
Sound carrier 6.0 MHz above the picture carrier
Sound carrier 6.5 MHz above the picture carrier
NICA
AM
FM
LV
Sound carrier 6.65 MHz above the picture carrier
Sound carrier 7.02 MHz above the picture carrier
Continuous tuning (4.00 - 9.00 MHz) with narrow sound detection filter
(110 kHz)
Continuous tuning (4.00 - 9.00 MHz) with broad sound detection filter
(240 kHz)
NICAM decoding
AM demodulation
FM demodulation
Tone whose frequency varies with the signal level
OFF
Suppresses the sound
BTUN
Band
Terrestrial
Terrestrial
Terrestrial
Satellite
Terrestrial
Terrestrial
Satellite
Satellite
Satellite
Terrestrial
Satellite
Terrestrial
Satellite
Terrestrial
Terrestrial
Terrestrial
Terrestrial
Satellite
Terrestrial
Satellite
Table 4.- Sound modes.
When the LV function is selected, the speaker of the MTD 120 permits a tone whose frequency depends on the level of the signal
received. This is very useful when installing antennas, since the user can locate the peak signal without having to look continually at the
monitor of the level meter.
When the NICAM option is selected, it is possible to measure the Bit Error Rate of the modulation. To obtain this measurement, from the
TV operating mode, level measurement, press key MONITOR [1] in order to activate the mode of maximum measurement information
displayed on the screen (name assigned to memory, power supply to external units, sound, colour system, TV standard, level and
frequency/channel). In the position relative to the type of Sound will appear the information about the type of NICAM according to:
Sound: Type + Error
Type = NICAM type:
"- -":
no NICAM is detected
"du":
dual NICAM
"st":
stereo NICAM
"mo":
mono NICAM
Error = indication of the bit error rate:
"E vI":
error rate < 1e-5
"E5":
1e-5 < error rate < 1e-4
"E4":
1e-4 < error rate < 1e-3
"E3":
1e-3 < error rate < 2.7 e-3
"E ^I":
error rate > 2.7 e-3
Therefore, for example, the indication Sound: duE vI has to be interpreted as NICAM sound is selected, the detected NICAM is dual and
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When you select the NTUN (continuous tuning using a narrow detection filter) and BTUN (continuous tuning using a broad detection filter)
options the screen displays a window showing the frequency deviation of the sound carrier, this is variable between 4.00 MHz and 9.00
MHz. To define it press keys
[6] to select the desired frequency deviation and press key ENTER [5] to validate.
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the error rate is below 1 e-5.
4.12.- Measurement Configuration Memories
To facilitate measurement, the MTD 120 is able to store up to 99 configurations in an internal memory. In this way, it is possible to select
the most common transmissions in a work area with their corresponding configurations quickly and easily.
The following parameters are stored in each configuration: the name assigned to the configuration, frequency or channel number, TV
system, type of measurement, external units supply voltage (VLNB), measurement units and sound parameters.
The different measuring configurations can be retrieved with the Data logger function, in order to conduct different data acquisitions in a
completely automatic way and store them in the memory for later print-out or processing (see paragraph '4.9.2.4 Data logger function').
4.12.1.- Storing a Measurement Configuration (STORE)
The process of storing a measurement configuration is the following:
1. Select the configuration you want on the MTD 120 (freq./channel, band, etc.).
2. Press key MEMORY [25] until the monitor displays the STORE screen. Check the configuration parameters. Then press keys
[6], to select the memory number that you wish to store the configuration in (from 1 to 99). This number corresponds to the column
headings of the Data Logger function.
If a configuration is stored in a memory location already containing information, that data will be lost.
3. (Optional) If you wish to assign a name to a memory position press key SHIFT [31], the first character of the name will blink, press keys
[6] and the different characters will appear in the first position of the configuration name. When you have chosen the first
character press key ENTER [5], to automatically move on to the second character. Repeat the process for a maximum of four
characters.
STORE: PM01
Channel
TV Sys
Meas
V Lnb
Units
Sound
=
=
=
=
=
=
1
23 (CCIR )
PAL-B/G
Lv
External
dBuV
5.50
Figure 22.- STORE screen, storing a measuring configuration.
4. Finally, press key MEMORY [25] or the key ENTER [5] and the configuration will be stored. If any other key is pressed, an error will be
indicated and the memory will not be updated.
4.12.2.- Retrieving a Configuration (RECALL)
Press key MEMORY [25]. The screen RECALL will appear on the monitor which shows the different parameters of each measuring
configuration stored. Pressing keys
[6], select the configuration to be retrieved (a number between 1 and 99).
Pressing the key MEMORY [25] again or the key ENTER [5] will retrieve the configuration.
RECALL: C33
Channel
TV Sys
Meas
V Lnb
Units
Sound
=
=
=
=
=
=
1
23 (CCIR )
PAL-B/G
Lv
External
dBuV
5.50
Figure 23.- RECALL screen, retrieving a measurement configuration.
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4.13.- Direct Access to Functions
Keys FA [28] and FB [29] give direct access to any of the functions on the TV and Spectrum Analyser mode functions menus. To
establish a relationship between the direct access key and a function, access the functions menu, select the function you wish to access
directly and press key FA [28] or FB [29]. From then on when you press key FA [28] or FB [29] the function will be accessed directly.
4.14.- Printing Measurements and Memories
By connecting the instrument to a serial printer it is possible to obtain a printed report of a sequence of measurements just at the moment
they are taken, or later, if they are recorded with the Data logger function. This enables the user to keep a file about the state of the system
and provide the documents related to the level measurements for analysis purposes.
The installation process consists of simply using the data transfer cable to connect the printer to the RS-232C connector [37] on the MTD
120 (see section '4.14.1 Handshake and control lines'). Switch off the power to both instruments before connecting.
To print measurements select the Data logger function on the functions menu (see section '4.9.2.4 Data Logger function'), access the
configuration menu, activate the print field (Print: On) and switch on the printer. From now on the printing process is equivalent to taking
measurements.
The following figure shows an example of printing two activated columns (memories 1 PM01 and 2 PM02) and two activated rows (test
points 1 and 2).
L O C AT I O N :
S I G N AT U R E :
D AT E :
TIME:
T E S T P O I N T:
01/01/1999
08.54.00
1
< 1>
PM01
Ch 23
Meas.:
Lv
Frequency:
487.25 MHz
Level:
69 dBuV
< 2>
PM02
Ch -Meas.:
Lv
Frequency:
621.25 MHz
Level:
75 dBuV
01/01/1999
08.55.00
2
< 1>
PM01
Ch 23
Meas.:
Lv
Frequency:
487.25 MHz
Level:
70 dBuV
< 2>
PM02
Ch -Meas.:
Lv
Frequency:
621.25 MHz
Level:
74 dBuV
Figure 24.- Printing measurements.
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D AT E :
TIME:
T E S T P O I N T:
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4.14.1.- Handshake and Control Lines
Next is described the handshake and control lines used by the MTD 120:
- The following parameters are used for printing through the serial port:
Rate:
19.200 bauds
Data bits:
8 bits
Parity:
No
Stop bits:
1
- The control lines used are:
- DATA TRANSMIT (pin 3 MTD 120):
To send data to the printer.
- CLEAR TO SEND (pin 8 MTD 120):
Data transfer control. Data are sent only when this line is active.
- DATA TERMINAL READY (pin 4 MTD 120):
This line is permanently active in order to indicate the establishment of the
communication.
Connections
The cable between the MTD 120 and the printer must have the following connections:
PC CONNECTOR
LEVEL METER CONNECTOR
Type D-25, female
Type D-9, female
SHIELD GROUND
DATA TRANSMIT
DATA RECEIVE
REQUEST TO SEND
CTS
DATA SET READY
GROUND
CARRIER DETECT
DATA TERMINAL READY
1
2
3
4
5
6
7
8
20
RING INDICATOR
22
2
3
1
4
DATA RECEIVE
DATA TRANSMIT
CARRIER DETECT
DATA TERM. READY
5
7
6
8
9
GROUND
REQUEST TO SEND
DATA SEND READY
CLEAR TO SEND
RING INDICATOR
12345
6789
Figure 25.- Connector RS-232C MTD 120. Pins numbering.
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5.- BER MEASUREMENT OF QPSK & QAM MODULATED SIGNALS
5.1.- Description
By means of the options BER measurement for DVB-Satellite (QPSK modulation), DVB-Cable signals (QAM modulation) and DVBTerrestrial (COFDM modulation), it is possible to make Bit Error Rate measurements on digital signals. Besides, these options incorporate the
DCI function (DVB Channels Identifier) which provides information on the tuned channel, in this way it is possible to identify it with total
certainty with no need to decode the digital signal.
5.2.- BER measurement mode selection
To select the BER measurement mode:
1) Select the TV operating mode. If present operating mode is the spectrum analyser mode press key SPECT [21].
2) Select the terrestrial band for the measurement of QAM or COFDM modulated signals or the satellite band for the measurement of
QPSK modulated signals.
QAM signals
QPSK signals
COFDM signals
47 MHz to 862 MHz
950 MHz to 2150 MHz
470 to 862 MHz
3) Select the DIGITAL operating mode by means of the key A/D [20].
4) Select the BER measurement mode: to do this press key LEVEL [22], press keys
to activate it press key ENTER [5] or key LEVEL [22].
[6] to select the BER measuring mode, next,
5.3.- QAM modulation
Before to measure the BER it is necessary to define some parameters concerning the digital signal, which are described next. To see its
present value or to modify it, being in the BER measuring screen, press key ENTER [5], a multiple-choice menu showing the functions relative
to the BER measurement will appear on the screen:
1) Modulations
It defines the modulation type. When selecting this function and pressing key ENTER [5], a multiple-choice menu will appear on the
screen, this menu permits to choose one of the following modulations: 16, 32, 64, 128 and 256.
2) Symbol Rate
When selecting this function and pressing key ENTER [5], a multiple-choice menu will appear on the screen, this menu permits to choose
one of the following values: 6875, 6111, 5000, 4443, 1528, 1500, 1408, 1333, 1266, 1000 kbauds, or well to define any other value by
means of the Other option.
3) Spectral Inv.
If necessary, activate the Spectral inversion. If the spectral inversion is not correctly selected, reception will not be correct.
4) Attenuator
It permits to select attenuation between 0 and 30 dB. It is advisable to activate the 30 dB attenuator under that measurement conditions
where the signal level is near to the maximum input level (approximately starting from 20 dB under the maximum level) and it is possible
that the tuner becomes saturated. Under no-saturation conditions, when increasing the attenuation value the BER measure must to
maintain or to increase (insufficient signal level) but never to decrease.
Once you have defined the QAM signal parameters, it will be possible to measure the BER.
When the BER measuring mode is selected, the monitor will show a picture like the following:
QAM
1.0E-5
BER before FEC
-8
-7
-6
-5
QEF
-3
-2
Freq: 800.00 MHz + 1.2kHz
W.P.
0 in 00:22:59
MPEG-2
Figure 26.- BER measuring screen for QAM modulated signals.
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When selecting the Other option, a screen titled QAM SYMBOL RATE will appear, this screen shows present Symbol Rate value, to
modify it press key SHIFT [31], enter the new value (four figures) and finally press key ENTER [5] to activate it.
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First of all it is shown the BER before FEC (Forward Error Correction).
In a digital reception system for cable signals, after the QAM decoder an error correction method called Reed-Solomon is applied (see
figure 27). Obviously, the error rate after the corrector is lower to the error rate at the QAM decoder output. This is the reason because this
screen provides the BER measurement before FEC (Forward Error Correction) and the number of non correctable errors (W.P., Wrong
Packets) received after Reed-Solomon in the measuring time.
BER before FEC
QAM
DEMOD.
TUNER
A/D
Wrong packets
REEDSOLOMON
Figure 27.- Digital reception system via cable.
The BER measurement is provided in scientific notation (i.e. 1.0 E-5 means 1.0x10-5 that is to say one wrong bit of every 100,000) and
through an analogue bar (as its length is smaller the signal quality will be better). The analogue representation is done on a logarithmic scale
(not linear).
With the aim to have a reference about the signal quality, it is considered that a system has a good quality when it decodes less than one
non-correctable error for every transmission hour. This border is known as QEF (Quasi-Error-Free) and it corresponds approximately to a
BER before FEC of 2.0E-4 BER (2.0x10-4 , that is to say two incorrect bits of every 10,000). This value is marked on the measurement bar of
the BER and therefore, BER for acceptable signals must be at the left side of this mark.
Below the BER analogue bar it is shown the tuned frequency (or channel) and the frequency deviation in kHz between the tuned
frequency and the one which optimizes the BER (i.e. 800.00 MHz + 1.2 kHz).
In the next line it is shown the number of non corrigible packets received 'wrong packets' (up to a maximum of 126) in the time detailed
on its right. A packet is considered wrong when one, at least, non corrigible bit is detected. To reset this measurement just modify the
measurement conditions: for example change the tuned frequency.
Finally it is shown a status line which displays information about the detected signal. The possible messages that can appear and its
meaning are shown in the following list. The messages are exposed from less to more fulfilment of the MPEG-2 standard:
No signal received
Any signal has been detected.
Signal received
A signal is detected but it can not be decoded.
Carrier recovered
A digital carrier has been detected but it can not be decoded.
MPEG-2
Correct detection of a MPEG-2 signal. The BER is showed.
In case of detecting a DVB signal, message MPEG-2 DVB-C will appear and the DVB Channel Identifier function will be autoatically
activated. See section 5.4.1 DVB Channel Identifier.
IMPORTANT REMARK
DVB-C channels tuning may require an adjusting process. It is recommended to follow next procedure:
1.- From the spectrum analyser mode, tune the channel at its central frequency.
2.- Switch to TV mode, BER measuring mode.
3.- If in the lower line of the screen does not appear MPEG-2 message (and consequently BER is unacceptable), by pressing keys
[6] deviate the tuning frequency until MPEG-2 message appears. Finally tune channel again to minimize the frequency
deviation which optimizes the BER and therefore minimize the BER.
If it is not possible to detect any MPEG-2 channel, make sure that digital signal parameters are correctly defined and if signal level is too
low, check that the 30 dB attenuator is not activated (Attenuator 0 dB).
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5.4.- QPSK modulation
Before to measure the BER it is necessary to define some parameters concerning the digital signal, which are described next. To see its
present value or to modify it, being in the BER measuring screen, press key ENTER [5], a multiple-choice menu showing the functions relative
to the BER measurement will appear:
1) Code Rate
Also known as Viterbi ratio. It defines the ratio between the number of data bits and actual transmission bits (the difference corresponds to
the control bits for error detection and correction). It permits to choose between 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9 and Auto. If Code
Rate parameter is not known it is possible to assign the Auto option.
2) Symbol Rate
It is possible to choose between the following values: 30000, 27500, 22000, 20000, 19995, 6110, 6000, 5998, 5632, 5062, 4340, 4000
kbauds, or well to define any other value (Other). When selecting the Other option, a screen titled QPSK SYMBOL RATE will appear.
This screen shows present value, to modify it press key SHIFT [31] and enter the new value through the keyboard. The unit accepts any
number with 5 figures between 2000 and 35000 kbauds (fifth figure acts as validation). For example, to select a symbol rate of 8200
kbauds it must be entered: 08200.
3) Spectral Inv.
Finally, if necessary, activate the Spectral inversion. The Auto mode permits to automate this selection except for the following Code
Rate: 4/5, 5/6, 6/7 and 8/9. If the spectral inversion is not correctly selected, reception will not be correct.
4) Attenuator
It permits to select attenuation between 0 and 30 dB. It is advisable to activate the 30 dB attenuator under that measurement conditions
where the signal level is near to the maximum input level (approximately starting from 20 dB under the maximum level) and it is possible
that the tuner becomes saturated. Under no-saturation conditions, when increasing the attenuation value the BER measure must to
maintain or to increase (insufficient signal level) but never to decrease.
Once you have defined the QPSK signal parameters, it will be possible to measure the BER.
When the BER measuring mode is selected, the monitor will show a picture like the following:
QPSK
1.0E-7
-6
-5
-4
BER after Viterbi:
2.0E-3
-3
-8
-7
-6
-5 QEF
Freq: 1777.0 + 1.2 MHz
W.P.
0 in 00:22:59
MPEG-2
-2
-1
2.0E-3
-3
-2
ENGLISH
BER before FEC:
Figure 28.- BER measuring screen for QPSK modulated signals.
Two BER measurements are shown:
1) BER before FEC (Forward Error Corrections)
2) BER after Viterbi
In a digital reception system for satellite signals, after the QPSK decoder two different correction methods are applied (see figure 29).
Obviously, each time we apply an error corrector to a digital signal, the error rate changes, therefore if we measure in a digital satellite
television system, for example, the error rate at the output of the QPSK demodulator, at the output of the Viterbi decoder, and at the output of
the Reed-Solomon decoder, we obtain nothing more than different error rates. This is the reason because the BER measurement is provided
before FEC, after Viterbi and the number of non correctable errors (W.P. - wrong packets-) received after Reed-Solomon for the measuring
time.
BER before FEC
BER after Viterbi
Wrong packets
I
TUNER
QPSK
DEMOD.
DUAL A/D
VITERBI
Q
Figure 29.- Digital reception system via satellite.
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REEDSOLOMON
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The BER measurement is provided in scientific notation (i.e. 2.0 E-3 means 2.0x10-3, that is to say two incorrect bits of every 1,000) and
through an analogue bar (as its length is smaller the signal quality will be better). The analogue representation is done on a logarithmic scale
(not linear).
With the aim to have a reference about the signal quality, it is considered that a system has a good quality when it decodes less than one
non-correctable error for every transmission hour. This border is known as QEF (Quasi-Error-Free) and it corresponds approximately to a
BER after Viterbi of 2.0E-4 BER (2.0x10-4). This value is marked on the measurement bar of the BER after Viterbi and therefore, BER for
acceptable signals must be at the left side of this mark.
Next it is shown the tuning frequency and the frequency deviation in MHz between the tuned frequency and the one which optimizes the
BER (i.e. Freq: 1777.0 +1.2 MHz).
Next it is shown the number of non corrigible packets received W.P. -wrong packets- (up to a maximum of 126) in the time detailed on its
right. A packet is considered wrong when a bit is received incorrectly. To reset this measurement just modify the measurement conditions: for
example change the tuning frequency.
Finally it is shown a status line with information about the detected signal. The possible messages that can appear and its meaning are
shown in the following list. The messages are exposed from less to more fulfilment of the MPEG-2 standard:
No signal received
Any signal has been detected.
Signal received
A signal is detected but it can not be decoded.
Carrier recovered
A digital carrier has been detected but it can not be decoded.
Viterbi synchronized
A digital carrier has been detected and the Viterbi algorithm is synchronized, but too many frames arrive with non correctable errors. It is
not possible to quantify the BER.
MPEG-2
Correct detection of a MPEG-2 signal.
In case of detecting a DVB signal, message MPEG-2 DVB-S will appear and the DVB Channel Identifier function will be automatically
activated. See section 5.4.1 DVB Channel Identifier.
IMPORTANT REMARK
DVB-S channels tuning may require an adjusting process. It is recommended to follow next procedure:
1.- From the spectrum analyser mode, tune the channel at its central frequency.
2.- Switch to TV mode, BER measuring mode.
3.- If in the lower line of the screen does not appear MPEG-2 message (and consequently BER is unacceptable), by pressing keys
[6] deviate the tuning frequency until MPEG-2 message appears. Finally tune again channel to minimize the frequency
deviation which optimizes the BER and therefore minimize the BER.
If it is not possible to detect any MPEG-2 channel, make sure that digital signal parameters are correctly defined and if signal level is too
low, check that the 30 dB attenuator is not activated (Attenuator 0 dB).
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5.5.- COFDM modulation
Before to measure the BER it is necessary to define some parameters concerning the digital signal, which are described next. To see its
present value or to modify it, being in the BER measuring screen, press the ENTER [5] key, a multiple-choice menu showing the functions
relative to the BER measurement will appear. The parameters that must be defined by the user are the following:
1) Carriers
It defines the number of modulation carriers between 2k and 8k. To modify its value, place the marker over the Carriers field by pressing
keys
[6] and then press ENTER [5] key: a menu will appear on the screen. With keys
[6] select the desired value for the
Carriers parameter and finally press ENTER [5] key again to validate.
2) Guard interval
The Guard Interval parameter corresponds to the time between symbols, its purpose is to permit a correct detection in multi-path situations. This parameter is defined according to the symbol length: 1/4, 1/8, 1/16, 1/32. To modify its value, press keys
[6] and place
the marker over the Guard Interval field and then press ENTER [5] key: a menu with the available values will appear. Then pressing keys
[6] select the desired value and finally press ENTER [5] key to validate.
3) Attenuator
It permits to select attenuation between 0 and 30 dB. It is advisable to activate the 30 dB attenuator under that measurement conditions
where the signal level is near to the maximum input level (approximately starting from 20 dB under the maximum level) and it is possible
that the tuner becomes saturated. Under no-saturation conditions, when increasing the attenuation value the BER measure must to maintain or to increase (insufficient signal level) but never to decrease.
This configuration menu shows, besides the user definable COFDM signal parameters, the value of the rest of COFDM signal parameters
detected automatically:
Code Rate
Also known as Viterbi ratio, defines the ratio between the data bits number and the total number of bits transmitted (the
difference corresponds to the number of control bits for the error detection and recovery).
Modulations
Carriers modulation. It also defines the system noise immunity. (QPSK, 16-QAM and 64-QAM).
Spectral Inv.
Defines the state of the spectral inversion.
Hierarchy
The DVB-T norm contemplates the possibility to make a DTT transmission with hierarchical levels, it is to say a simultaneous transmission of the same program with different image qualities and noise protection levels, in order the
receiver decodes the signal in the best conditions.
Once you have defined the COFDM signal parameters, it will be possible to measure the BER. When the BER measuring mode is selected, the monitor will show a picture like the following:
COFDM
1.0E-7
27%
0
25
50
BER after Viterbi:
75
-7
-6
-5 QEF -3
Chan: 67
W.P.
0 in 00:22:59
MPEG-2
DVB-T
100
-2
-1
Figure 30.- COFDM signals BER measuring screen.
Two measures are shown:
1) CSI: Channel status information
2) BER after Viterbi
The CSI measure (Channel Status Information) is a qualitative measure about channel state, between 0 and 100%. The optimum value
corresponds to 0%. This measure permits to look for the best situation even in those measuring conditions where the measured BER is best
than the minimum readout (in this way, in the example of the previous figure, the measured BER is lower that the minimum readout, 1.0x10-7,
but the CSI measurement, 27%, still can be improved).
Next it is shown the BER after Viterbi measurement both in numeric and graphic bar format.
In a reception system of terrestrial digital signal, after the COFDM decoder two error correction methods are applied. Obviously, each time
we apply an error corrector to the digital signal, the error rate changes, therefore if we measure the error rate at the output of the COFDM
demodulator, at the output of the Viterbi decoder, and at the output of the Reed-Solomon decoder, we obtain nothing more than different error
rates. This is the reason because of the QPSK-COFDM option provide the BER after Viterbi and the number of Wrong packets received
after Reed- Solomon.
145
ENGLISH
CSI:
TV & SAT Level Meter MTD 120
User Manual
BER after Viterbi
COFDM
DEMOD.
TUNER
A/D
VITERBI
Wrong packets
REEDSOLOMON
Figure 31.- COFDM reception system.
The BER measurement is provided in scientific notation (i.e. 3.1 E-7 means 3.1x10 -7, that is to say 3.1 wrong bits of each 10000000) and
through a graphic bar (as its length is smaller the signal quality will be better). The analogue representation is done on a logarithmic scale (not
linear), that is to say, the bar divisions correspond to the exponent of the measurement.
With the aim to have a reference about the signal quality, it is considered that a system has a good quality when it decodes less than one
non-correctable error for every transmission hour. This border is known as QEF (QUASI-ERROR-FREE) and it corresponds approximately to
a BER after Viterbi of 2.0E-4 BER (2.0x10-4, that is to say 2 wrong bits of each 10000). This value is marked on the measurement bar of the
BER and therefore, BER for acceptable signals must be at the left side of this mark.
In the lower line of the screen it appears the W. P. counter (Wrong Packets counter). This counter shows the number of wrong packets
received after Reed-Solomon during the measuring time. This counter is automatically activated when the unit detects an MPEG-2 signal.
If at any time, the received signal stops to satisfy the requirements of the MPEG-2 standard, this counter will deactivate, that is to say it
will keep the number of wrong packets received and the measuring time, later, if an MPEG-2 signal is received again, it will activate with no
reset.
When during any measuring time interval the counter has been deactivated, in other words the signal has not satisfied the MPEG-2 requirements, the presentation of this counter will alternate with another counter titled FAIL. This second counter shows the time that the detected
signal has not fulfilled the MPEG-2 standard requirements (12 seconds in the example of the following figure) and the number of signal cuts (2
in the example of the following figure). To reset the counter it is necessary to change any of the detection parameters, for example tune again
the signal or push twice the LEVEL [22] key.
COFDM
1.0E-7
CSI:
27%
0
25
50
BER after Viterbi:
-7
-6
-5 QEF
Chan: 67
FAIL
00:00:12
MPEG-2
DVB-T
75
-3
100
-2
-1
( 2)
Figure 32.- Signalling two MPEG-2 signal cuts with a total length of 12 seconds.
Finally it is shown a status line with information about the detected signal. The possible messages that can appear and its meaning are
showing the following list. The messages are exposed from less to more fulfilment of the MPEG-2 standard:
No signal received
No signal has been detected.
Timing recovered
Only it is possible to recuperate the symbol time.
AFC in lock
The system automatic frequency control can identify and lock a digital transmission (DTT) but its parameters can not be obtained. It can
be due to a transitory situation previous to the TPS identification (Transmission Parameter Signalling) or well to a DTT transmission with
an insufficient C/N ratio.
146
TV & SAT Level Meter MTD 120
User Manual
TPS in lock
The TPS (Transmission Parameter Signalling) are decoded. The TPS are carriers (17 in the 2k system and 68 in the 8k system) modulated in DBPSK, containing information related to the transmission, modulation and codification: Modulation type (QPSK, 16-QAM, 64QAM), Hierarchy, Guard Interval, Viterbi Code Rate, Transmission mode (2k or 8k) and Number of the received frame.
MPEG-2
Correct detection of a MPEG-2 signal.
ENGLISH
In case of detecting a DVB signal, message MPEG-2 DVB-T will appear and the DVB Channel Identifier function will be automatically
activated. See section 5.6. DVB Channel Identifier.
147
TV & SAT Level Meter MTD 120
User Manual
5.6.- DVB Channels Identifier: DCI function
This function permits to identify DVB channels with no need to have a digital signal decoder which permits to see transmitted TV
channels.
The DVB group recommends to digital TV service operators the codification on the Transport Stream of some particular fields containing
data information. The Transport Stream is a sequence of packets, of constant length, which carry video or audio information or data.
Data packets can be grouped to constitute TABLES, some of these tables content information defined by the network operator and which
show the type of service that is being supplied to the users. Among the different data defined in these tables, the most frequently used data
for channel identification purposes are:
Network
It contents the name given to the set of all the Transport Stream managed inside the same communication channel.
Bouquet
It contents the name given to the set of all the services commercialized as one entity.
Service
It contents the names of services that, under the control of one operator, can be shown at each moment on the
Transport Stream, as a function of current programming.
In case the operator includes this information, the three fields are not transmitted at the same time but they appear alternatively in
different packets. Besides, the cadence of presentation of each one of these packets may vary from one operator to another.
When tuning a DVB compatible transponder, the DCI function (DVB Channels Identifier) detects those data packets including service
information relative to these three fields and shows on the lower line on the screen the information contained in them automatically.
QPSK
1.0E-7
BER before FEC:
-6
-5
-4
BER after Viterbi:
1.0E-3
-3
-8
-7
-6
-5 QEF
Freq: 1224.0 - 0,8 MHz
W.P.
0 in 00:22:59
MPEG-2 DVB-S
QPSK
-3
-2
1.0E-7
BER before FEC:
-6
-5
-4
BER after Viterbi:
-2
-1
1.0E-7
-3
-8
-7
-6
-5 QEF
Freq: 1224.0 - 0,8 MHz
W.P.
0 in 00:23:48
Service: NetMed
QPSK
1.0E-3
BER before FEC:
-2
-1
1.0E-7
-6
-5
-4
BER after Viterbi:
-3
-2
1.0E-7
1.0E-3
-3
-8
-7
-6
-5 QEF
Freq: 1224.0 - 0,8 MHz
W.P.
0 in 00:23:15
Network: NetMed
QPSK
-3
1.0E-7
BER before FEC:
-6
-5
-4
BER after Viterbi:
-2
-1
1.0E-7
1.0E-3
-3
-8
-7
-6
-5 QEF
Freq: 1224.0 - 0,8 MHz
W.P.
0 in 00:23:22
Bouquet: News Bouquet
-2
-1
1.0E-7
-3
-2
Figure 33.- DCI function. In this example the information coded by the operator on the
Service and Network fields is the same.
The information that appears in the Network, Bouquet and Service fields is responsibility of the Operator in charge
of the tuned transponder. The MTD 120 only decodes this information, if it is present, and shows it on the screen.
148
-2
TV & SAT Level Meter MTD 120
User Manual
6.- DESCRIPTION OF THE INPUTS AND OUTPUTS
6.1.- RF input
The RF input is through the RF
[35] connector on the side panel. The peak signal level should never exceed 130 dBµV.
6.2.- RS-232C serial port
The MTD 120 incorporates an RS-232C serial port for data exchange with a PC, a serial printer or to other devices. The signals in this
connector are described in Table 5.
5
4
3
2
1
9
8
7
6
Figure 34.- RS-232C connector. External view.
PIN No.
SIGNAL
CHARACTERISTICS
1
Carrier Detect
(not connected)
2
Data Request (RxD)
3
Data Transmit (TxD)
4
Data Transmission Ready (DTR)
5
Ground (GND)
6
Data Send Ready (DSR)
7
Request To Send (RTS)
8
Clear To Send (CTS)
9
Ring Indicator
Fixed at +12 V
(not connected)
Table 5.- Description of the RS-232C connector.
149
ENGLISH
(not connected)
TV & SAT Level Meter MTD 120
User Manual
6.3.- Scart (DIN EN 50049)
20
21
18
19
16
17
14
15
12
13
10
11
9
8
4
6
7
5
2
3
1
Figure 35.- Scart socket (external view).
Also known as PERITEL connector (in conformity with standard NF-C92250). The signals in this connector are the following:
PIN number
SIGNAL
CHARACT.
PIN number
SIGNAL
1
Right channel audio output
12
Digital bus interface
2
Right channel audio input
13
Red grounding (R)
3
Left channel audio output
14
Digital bus reserved
4
Audio grounding
15
Red output (R)
5
Blue grounding (B)
16
Blanked signal
6
Left channel audio input
17
Composite video grounding
7
Blue output (B)
18
Blanked return
8
Switching voltage
19
Composite video output
9
Green grounding (G)
20
Video input
21
Connector shield grounding
10
Digital bus interface
11
Green output (G)
(not connected)
Table 6.- Description of the Scart.
150
CHARACT.
(not connected)
(not connected)
(not connected)
(not connected)
TV & SAT Level Meter MTD 120
User Manual
7.- MAINTENANCE
7.1.- Considerations about the Screen (only ref. 4202)
This paragraph offers key considerations regarding the use of the colour screen, taken from the specifications of the manufacturer.
In the LCD display, the user may find pixels that do not light up or pixels that are permanently lit. This should not be regarded as a defect
in the LCD. In accordance with the manufacturer quality standard, 9 pixels with these characteristics are considered admissible.
Pixels which are not detected when the distance from the surface of the LCD screen to the human eye is greater than 35 cm, with a
viewing angle of 90º between the eye and the screen should not be considered manufacturing defects either.
It is advisable a viewing angle of 15º in the 6.00 o'clock direction in order to obtain the optimum visualization of the screen. See following
figure.
0
1
A/D
2
SPECT
CH/F
3
LEVEL
4
MONITOR
5
SEARCH
MODE
6
MEMORY
ENTER
SOUND
RS-232C
EXT.
SUPPLY
RST
SHIFT
SCREEN
8
7
LNB
9
FA
FB
SCART ITF
EXT VIDEO
DRAIN
BATTERY OK
15°
CHARGER
Medidor de Campo Color TV&SAT MTD 120
Figure 36.- Optimum viewing of the screen.
7.2.- Internal fuses which user cannot replace
The following fuses are found on the base board. Their location identifier and characteristics are the following:
F4 & F5
5A
F
63 V
SMD
F3
1A
F
63 V
SMD
7.3.- Replacing the Batteries
A
A
C
B
A
C
Figure 37.- Battery compartment.
- Remove the rear holster, if in place.
- The battery compartment is located in the rear panel of the instrument. Remove the 5 securing screws (A) (2 on each side and 1 at the
bottom) shown in the previous figure (here the battery compartment is shown taken out and facing down). Rest the MTD 120 on its rear
panel and lift it to free the battery compartment.
- Remove the 2 side screws (C) securing the battery holder (B).
- Disconnect the battery terminals, remove the anti-humidity paper and replace the batteries with two new ones of the same type.
151
ENGLISH
Batteries must be replaced whenever the capacity of the fully-charged batteries is noticeably diminished. To change the batteries, follow
next procedure:
TV & SAT Level Meter MTD 120
User Manual
IMPORTANT
The maximum period of time that the instrument can remain disconnected from the batteries before loosing measurement
configurations and stored data is 5 minutes.
- Replace the anti-humidity paper and connect the terminals to the new batteries. Remember to maintain the polarity of the terminals:
red-positive, black-negative.
WARNING
Avoid any type of short circuit among the cables connected to the battery, since the resulting high current may cause serious
damage to the instrument.
- Place and secure the battery holder (B) with the two screws (C).
- Insert the battery compartment into the back of the MTD 120 and secure with the five screws (A).
- If you wish, replace the holster.
7.4.- Cleaning Recommendations
CAUTION
To clean the cover, take care the instrument is disconnected.
Do not use scented hydrocarbons or chlorized solvents.
Such products may attack the plastics used in the construction of the cover.
The cover should be cleaned by means of a light solution of detergent and water applied with a soft cloth.
Dry thoroughly before using the system again.
CAUTION
Do not use for the cleaning of the front panel and particularly the viewfinders, alcohol
or its derivatives, these products can attack the mechanical properties of the materials
and diminish their useful time of life.
152
MTD 120
APENDICE A .- Tablas Canal - Frecuencia
APPENDICE A: Tables Canal-Fréquence
APPENDIX A: Channel - Frequency tables
Ch.
2
3
4
S01
S02
S03
S04
S05
S06
S07
S08
S09
S10
5
6
Freq.
48,25
55,25
62,25
105,25
112,25
119,25
126,25
133,25
140,25
147,25
154,25
161,25
168,25
175,25
182,25
Ch.
7
8
9
10
11
12
S11
S12
S13
S14
S15
S16
S17
S18
S19
Freq.
189,25
196,25
203,25
210,25
217,25
224,25
231,25
238,25
245,25
252,25
259,25
266,25
273,25
280,25
287,25
Ch.
S20
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
Freq.
294,25
303,25
311,25
319,25
327,25
335,25
343,25
351,25
359,25
367,25
375,25
383,25
391,25
399,25
407,25
Ch.
S35
S36
S37
S38
S39
S40
S41
21
22
23
24
25
26
27
28
Freq.
415,25
423,25
431,25
439,25
447,25
455,25
463,25
471,25
479,25
487,25
495,25
503,25
511,25
519,25
527,25
Ch.
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
Freq.
535,25
543,25
551,25
559,25
567,25
575,25
583,25
591,25
599,25
607,25
615,25
623,25
631,25
639,25
647,25
Ch.
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Freq.
655,25
663,25
671,25
679,25
687,25
695,25
703,25
711,25
719,25
727,25
735,25
743,25
751,25
759,25
767,25
Ch.
59
60
61
62
63
64
65
66
67
68
69
Freq.
775,25
783,25
791,25
799,25
807,25
815,25
823,25
831,25
839,25
847,25
855,25
Freq.
47,75
55,75
60,50
63,75
176
184
192
200
208
216
224
Ch.
12
13
14
D01
D02
D03
D04
D05
D06
D07
D08
Freq.
232
240
288
303,25
315,25
327,25
339,25
351,25
363,25
375,25
387,25
Ch.
D09
21
22
23
24
25
26
27
28
29
30
Freq.
399,25
471,25
479,25
487,25
495,25
503,25
511,25
519,25
527,25
535,25
543,25
Ch.
31
32
33
34
35
36
37
38
39
40
41
Freq.
551,25
559,25
567,25
575,25
583,25
591,25
599,25
607,25
615,25
623,25
631,25
Ch.
42
43
44
45
46
47
48
49
50
51
52
Freq.
639,25
647,25
655,25
663,25
671,25
679,25
687,25
695,25
703,25
711,25
719,25
Ch.
53
54
55
56
57
58
59
60
61
62
63
Freq.
727,25
735,25
743,25
751,25
759,25
767,25
775,25
783,25
791,25
799,25
807,25
Ch.
64
65
66
67
68
69
Freq.
815,25
823,25
831,25
839,25
847,25
855,25
Freq.
49,75
59,25
77,25
85,25
93,25
111,25
119,25
127,25
135,25
143,25
151,25
159,25
167,25
175,25
183,25
Ch.
8
9
10
11
12
SK11
SK12
SK13
SK14
SK15
SK16
SK17
SK18
S19
S20
Freq.
191,25
199,25
207,25
215,25
223,25
231,25
239,25
247,25
255,25
263,25
271,25
279,25
287,25
295,25
303,25
Ch.
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
Freq.
311,25
319,25
327,25
335,25
343,25
351,25
359,25
367,25
375,25
383,25
391,25
399,25
407,25
415,25
423,25
Ch.
S36
S37
S38
S39
S40
21
22
23
24
25
26
27
28
29
30
Freq.
431,25
439,25
447,25
455,25
463,25
471,25
479,25
487,25
495,25
503,25
511,25
519,25
527,25
535,25
543,25
Ch.
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
Freq.
551,25
559,25
567,25
575,25
583,25
591,25
599,25
607,25
615,25
623,25
631,25
639,25
647,25
655,25
663,25
Ch.
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
Freq.
671,25
679,25
687,25
695,25
703,25
711,25
719,25
727,25
735,25
743,25
751,25
759,25
767,25
775,25
783,25
Ch.
61
62
63
64
65
66
67
68
69
Freq.
791,25
799,25
807,25
815,25
823,25
831,25
839,25
847,25
855,25
Freq.
55,25
61,25
67,25
77,25
83,25
175,25
181,25
187,25
193,25
199,25
205,25
Ch.
A13
14
15
16
17
18
19
20
21
22
23
Freq.
211,25
471,25
477,25
483,25
489,25
495,25
501,25
507,25
513,25
519,25
525,25
Ch.
24
25
26
27
28
29
30
31
32
33
34
Freq.
531,25
537,25
543,25
549,25
555,25
561,25
567,25
573,25
579,25
585,25
591,25
Ch.
35
36
37
38
39
40
41
42
43
44
45
Freq.
597,25
603,25
609,25
615,25
621,25
627,25
633,25
639,25
645,25
651,25
657,25
Ch.
46
47
48
49
50
51
52
53
54
55
56
Freq.
663,25
669,25
675,25
681,25
687,25
693,25
699,25
705,25
711,25
717,25
723,25
Ch.
57
58
59
60
61
62
63
64
65
66
67
Freq.
729,25
735,25
741,25
747,25
753,25
759,25
765,25
771,25
777,25
783,25
789,25
Ch.
68
69
70
71
72
73
74
75
76
77
78
Freq.
795,25
801,25
807,25
813,25
819,25
825,25
831,25
837,25
843,25
849,25
855,25
ESPAÑOL
CCIR
Ch.
FA
FB
FC1
FC
5
6
7
8
9
10
11
FRANÇAIS
STDL
Ch.
1
2
3
4
5
SK1
SK2
SK3
SK4
SK5
SK6
SK7
SK8
6
7
FCC
Ch.
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
153
ENGLISH
OIRT
MTD 120
ASTRA-HL
Ch.
49
51
53
55
57
Freq.
10714,25
10743,75
10773,25
10802,75
10832,25
Ch.
59
61
63
33
35
Freq.
10861,75
10891,25
10920,75
10964,25
10993,75
Ch.
37
39
41
43
45
Freq.
11023,25
11052,75
11082,25
11111,75
11141,25
Ch.
47
1
3
5
7
Freq.
11170,75
11214,25
11243,75
11273,25
11302,75
Ch.
9
11
13
15
17
Freq.
11332,25
11361,75
11391,25
11420,75
11464,25
Ch.
19
21
23
25
27
Freq.
11493.75
11523,25
11552,75
11582,25
11611,75
Ch.
29
31
Freq.
11641,25
11670,75
Ch.
60
62
64
34
36
Freq.
10876,50
10906,00
10935,50
10979,00
11008,50
Ch.
38
40
42
44
46
Freq.
11038,00
11067,50
11097,00
11126,50
11156,00
Ch.
48
2
4
6
8
Freq.
11185,50
11229,00
11258,50
11288,00
11317,50
Ch.
10
12
14
16
18
Freq.
11347,00
11376,50
11406,00
11435,50
11479,00
Ch.
20
22
24
26
28
Freq.
11508,50
11538,00
11567,50
11597,00
11626,50
Ch.
30
32
Freq.
11656,00
11685,50
Ch.
73
75
77
79
Freq.
11876
11914
11954
11992
Ch.
81
83
85
87
Freq.
12032
12070
12110
12148
Ch.
89
91
93
95
Freq.
12188
12226
12266
12304
Ch.
97
99
101
103
Freq.
12344
12382
12422
12460
Ch.
105
107
109
111
Freq.
12515
12545
12574
12604
Ch.
113
115
117
119
Freq.
12633
12663
12692
12722
Ch.
74
76
78
80
Freq.
11895
11934
11973
12012
Ch.
82
84
86
88
Freq.
12051
12090
12129
12168
Ch.
90
92
94
96
Freq.
12207
12246
12285
12324
Ch.
98
100
102
104
Freq.
12363
12402
12441
12480
Ch.
106
108
110
112
Freq.
12522
12552
12581
12610
Ch.
114
116
118
120
Freq.
12640
12670
12699
12728
Ch.
119
121D
121A
123
Freq.
10892
10914
10933
10974
Ch.
125
127
129
131
Freq.
11009
11054
11095
11148
Ch.
131b
1D
1A
3
Freq.
11178
11205
11224
11265
Ch.
5
7
9D
9A
Freq.
11304
11348
11371
11389
Ch.
11D
11A
13
15
Freq.
11413
11431
11474
11516
Ch.
153
155
157
Freq.
11566
11604
11642
Ch.
120
122
124
126
128
Freq.
10911
10949
10989
11033
11079
Ch.
130A
130D
132A
132D
2
Freq.
11113
11131
11163
11196
11241
Ch.
4
4b
6A
6D
8
Freq.
11280
11283
11321
11339
11363
Ch.
10A
10D
12A
12D
14
Freq.
11404
11422
11446
11446,10
11492
Ch.
16
154
156
158
Freq.
11531
11585
11623
11662
Ch.
59
61
63
65
67
Freq.
11900
11938
11977
12015
12053
Ch.
69
71
73
75
75b
Freq.
12092
12130
12168
12203
12211
Ch.
77
79
81
83
85
Freq.
12245
12284
12322
12360
12399
Ch.
87
89
91
93
93b
Freq.
12437
12476
12539
12565
12573
Ch.
93c
93d
95
97
99
Freq.
12583
12590
12615
12654
12692
Ch.
101
Freq.
12735
Ch.
58
60
62
64
Freq.
11881
11919
11958
11996
Ch.
66
68
70
72
Freq.
12034
12073
12111
12149
Ch.
74
76
78
80
Freq.
12188
12226
12265
12303
Ch.
82
84
86
88
Freq.
12341
12380
12418
12460
Ch.
90
92
94
96
Freq.
12520
12558
12597
12634
Ch.
98
100
Freq.
12673
12713
ASTRA-VL
Ch.
50
52
54
56
58
Freq.
10729,00
10758,50
10788,00
10817,50
10847,00
ASTRA-HH
Ch.
65
67
69
71
Freq.
11720
11758
11798
11837
ASTRA-VH
Ch.
66
68
70
72
Freq.
11740
11778
11817
11856
EUT13-HL
Ch.
111
113
115
117
Freq.
10722
10775
10815
10853
EUT13-VL
Ch.
110
112
114
116
118
Freq.
10719
10758
10796
10834
10873
EUT13-HH
Ch.
159
51
53
55
57
Freq.
11681
11745
11785
11823
11862
EUT13-VH
Ch.
50
52
54
56
Freq.
11727
11766
11804
11843
154
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