1KW FM Stereo
Technical proposal
For
1KW Dual Drive
FM Transmitter
LINK
&
TAKTA
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1KW Dual Drive FM Transmitter
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1- System General Description:
1.1: Transmitter system Composition:
The proposed 1KW dual drive FM transmitter advanced series is composed of
following equipment.
Transmitter LOM:
Item
1
2
3
4
5
Module
25W FM Exciter
Automatic changeover
1KW FM Amplifier
(2+1) Redundant power supply for 1KW FM amplifier
19” Main rack
Quantity
2
1
1
1
1
System composition
Transmitter Block diagram
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Transmitter Block Diagram
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2- FM Transmitter General Description:
2.1: FM EXCITER:
The "SERIES 2000" 25W FM EXCITER, meets the norms and requirements
currently necessary for radio broadcasting, bearing in mind the high quality of the audio
signal, which normally comes from a digital source, (compact disk, music or advertising
stored on a hard disk, etc.).
Exciter front panel & Top
The "SERIES 2000" 25W FM EXCITER generates a high quality Frequency
Modulated signal wihch surpasses the present rules governing FM material. The
working frequency is generated in a "Direct Oscillator" without multiplying or
converting it, and so the spectral integrity and the Sound/Noise ratio are notably
improved.
The aforementioned Direct Oscillator (Direct V.F.O) has been constructed using
the "SMD" technique and incorporates transistors with extraordinarily low noise, and "
MMIC" monolithic amplifying devices. The Direct Oscillator "Direct V.F.O" is housed
in a thick walled metal box to protect the signal wich is generated, from external electric
and magnetic fields.
The working frequency is controlled via a "PLL" type regulating device, with
parallel type decimal format programming. In this way the frequency is selected directly
via 4 rotating selectors; the hundreds, tens, units and tenths, of the desired frequency. An
external selection is possible when the EXCITER is used in type "N+1" etc., automatic
systems.
The power amplification stage delivers 20W and it has a wide bandwidth so it
does not require any adjustment. An Automatic Gain Control (A.G.C.) system allows the
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power to be regulated, maintaining it stable throughout the entireFMband. The "SERIES
2000" EXCITER can be modulated by means of a balanced mono, or "MPX"
unbalanced stereo, signal with a floating or grounded earth, choosing the most
appropriate in order to avoid earth loops which could make the Signal/Noise ratio worse.
Furthermore, in both cases an R.D.S. or S.C.A. signal can be incorporated via one (or
two, on request) subcarrier input(s).
Exciter from top
The functions and levels of the system have been summarised in a modern and
intuitive front panel where the level indicators, which use LED bases, are located. This
allows the control of the level of modulation and RF output, both direct and reflected.
The level of modulation is REAL since an internal demodulator is fitted which
substitutes the carrier modulation signal to be trnasmitted. There is also a 1KHz
calibrating oscillator incorporated, in order to measure the level of modulation.
The selection of the measurements is carried out through a sequential system
which is totally electronic and safe, instead of the traditional mechanical switch, with a
luminous display of the measurement chosen. A series of two colour LEDs show the
working of the equipment. They shine green under normal working conditions and red if
there is a fault. In this way the power supply, the working of the "PLL", and the
presence of an excessive reflected output power, are all controlled.
Also in the front panel there is space for a display to indicate the chosen
frequency. This (optional) device is useful if the EXCITER is being used in systems
with external programming of the emission frecuency ("N+1"). With the "SERIES 2000"
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EXCITER you can externally change the output power, the working frequency (as has
already been said), and also you can block or activate the RF output using an "Interlock"
device. The initial adjustments for setting up the equipment are contained in a single
readjustment of the modulation level according tot he level of the signal (whether it is
mono or MPX) which is applied to the EXCITER.
The correct working of the EXCITER can be controlled from a logical (+12V)
output which is activated from the moment of the (correct) switching on of the
equipment. If there is an RF output fault, power supply failure or simply a block in the
equipment, the output is deactivated. If there is a fault in the EXCITER the
aforementioned logical signal can activate a reserve system or "N+1" etc.
THE EXCITER is presented in a "Rack" format two "U"s high, with the
connection situated in the rear panel. The heat radiators which belong to the power
stages of RF and the power supply are situated at the two sides of the equipment. In this
way they can receive a convection current of air which is not interrupted by the different
depths of other equipment as is the case when the said radiators are mounted in the rear
panel.
The front panel has had a lamina of Polycarbonate ("Lexan") applied to it which
protects it from external agents, scratches, etc. and which is easy to clean. The normal
power supply is 220V c.a., but on request it can be supplied adapted to 110-115V c.a.
supplies.
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Exciter Block diagram:
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2.2: Automatic Changeover Unit:
It is quite usual to have a reserve EXCITER available at radio broadcast
installations, because this is one of the most essential pieces of equipment or
guaranteeing transmission continuity. The current trend is to produce transmitters with
redundancy technique in order to be able to guarantee high reliability of the installation
amplification section, but not so with respect to excitation.
When the TRANSMITTER is low power, with the EXCITER included as an
integral part within this same TRANSMITTER, it is recommended that a complete unit
is made available to provide transmission continuously by simple replacement.
The reserve EXCITER or TRANSMITTER will replace the main unit in those
cases in which a failure or fault involving the main EXCITER or TRANSMITTER
interrupts the broadcast, It is also desirable that the switch-over from the main unit to the
reserve is performed automatically, since most installation are unmanned, and also
because they are often located at remote sites and/or are not very accessible. This usually
means that the time between the failures occurring and an engineer arriving at the
remote site to carry out the replacement operation is quite unacceptable. The availability
of small, coaxial power relays makes it relatively easy to develop simple automatic
systems that detect the failure and subsequent connection of the reserve unit in a rapid
fashion.
The automatic exciter selector (or low power transmitters) (changeover) 1+1 from
LINK Comunicaciones include, in a single stylized "Rack for one unit (44.5 mm), t he
entire electronics system, plus the necessary coaxial relay. The front panel intuitively
displays all the required information for establishing the current operational status of the
equipment with a simple glance.
Automatic Changeover Unit
The logic circuits for the automatic exciter-transmitter selector 1+1 includes the
following functions:
a) Automatic changeover of the exciter-transmitter connected as (MAIN) to the
(RESERVE) when a failure occurs in the former. The (FAILURE) information may
come from the actual EXCITER-TRANSMITTER (all LINK Comunicaciones.
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equipment provides this information), or directly from the RF signal that enters the
coaxial relay (selectable by means of an internal Jumper). When the FAILURE signal
comes from the actual equipment, it can usually be adjusted so that the logic signal is
enabled as from a specific power reduction threshold (this depends on the actual
equipment).
b) When performing the EXCITER-TRANSMITTER changeover operation, the
AUTOMATIC SELECTOR 1+1 switches off the power supply to the faulty unit
(MAIN), switches over the RF output using the coaxial relay, switches the MPX
modulation unit over to RESERVE and then switches the power supply back on. During
the time required to perform all these switching operations, which only takes a few
milliseconds, an interlock device is used to isolate the EXCITER TRANSMITTER
outputs in order to prevent the coaxial relay switching in a hot condition (with RF power
present).
c) lf the automatic "RESET" mode has been selected, a five-minute timer
operation commences after a changeover from MAIN to RESERVE operation and when
this time period expires the system will respond by switching back to the MAIN unit and
attempting to put it into normal service. If this is successful, the system will then
continue in this way as if nothing had happened (a case of isolated incident). lf the
operation is unsuccessful (permanent failure), the system will continue with the
RESERVE equipment in operation permanently and the MAIN is recorded as faulty.
d) If manual RESET has been selected, this second opportunity does not take
place until a manual reset is performed or a power supply cut initiates a new sequence.
e) A remote control and information system uses logic signals to provide
permanent indication of the current operation status of the equipment, and also to
activate the remote RESET. LINK Comunicaciones has suitable interface cards available
for activating or transmitting logic signals by means of opto couplers or voltage free
relay contacts.
F) In the case of a failure of the AUTOMATIC SELECTOR 1+1 electronic
circuits, the MAIN EXCITER TRANSMITTER will remain switched on and fully
operational.
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2.3: 1KW Amplifier:
The 1 KW ADVANCED SERIES FM transmitter form part of a new series of
compact transmitters by LINK Communicaciones S.A. can be used as a power amplifier
module in this proposed system. New technological advances make it possible to
construct smaller and smaller electronic equipment, and at a lower cost, and without any
reduction in quality.
1KW Power Amplifier
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500W Power Amplifier Card Block Diagram
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1KW Power Amplifier Block Diagram
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The amplifier is mainly designed for use for radio in medium sized communities
and also as an emergency transmitter for higher-powered units. Two units of 500W
amplifier card are implemented in 1KW amplifier / transmitter equipment. Each 500W
amplifier card is containing of four (4) units of MOSFET RF transistors (MRF151).
The amplifier equipment is fitted with a redundant type, switched power supply
outside the unit, composed of three hot-pluggable modules. This ensures extremely
high performance, and very high operational safety.
1KW Power Amplifier & External redundant power supply unit
The reduced size makes
for easy installation anywhere.
All that is required is adequate
excitation, connection to the
antenna and a power supply. It
occupies 4+1 spaces of a
standard 19" rack (223 mm), plus
1 or 2 units corresponding to the
exciter (depending on the
model).
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The TRANSMITTER incorporates circuits for manual or remote start. It is fitted
with a 220 V outlet for powering the exciter which comes on-line or goes off-line
depending on whether the TRANSMITTER is on or off.
The various components are protected by including two soft-start systems: The
first makes a normal connection to the power supply network, but after a brief cut
(micro-cut) the new connection is delayed for a few seconds to prevent the typical
current peaks of connections to switched power supplies. This prevents possible tripping
of magnetic-thermal switches or fusing in the event of micro-cuts in the electricity
supply.
The second soft-start device prevents the sudden RF power peak when connecting
the "PLL" of the exciter and activating its output. This sudden connection causes
dangerous current peaks in the power transistors. The power control voltage is kept at
zero when there is no excitation. When excitation appears the control voltage slowly
increases as does the power (over several seconds) until the desired output level is
reached. Any cut in the excitation, however brief, restarts the process of a slow power
increase.
Readouts of the different transmitter variables are shown on an alphanumeric
LCD screen. A button allows sequential selection of the different displays that appear on
the screen. The screen is normally unlit. Pressing any button lights the screen for 30-45
sec to simplify the readings. By default the first screen is activated when the unit is
turned on. Readings outside the limits are indicated by a flashing display which remains
lit to indicate an error condition. The screen also lights up whenever there is any
operational error.
The display shows the values for POWER, REFLECTED POWER, VOLTAGE,
CURRENT, and TIMER. It also indicates the DATA BUS DIRECTION number for the
Tele-information system.
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Beside the display is a LED indicating the existence of an activated failure alarm
condition such as excess reflected power, excess amplifier current, or excess
temperature. Whenever one of these failure conditions occurs the LED shows red and
the transmitter shuts down in an ALARM condition. The screen displays a description of
the failure. Beside this LED is a button to reset the unit and put it back into operation (at
reduced power, or after resolving the problem).
The excess current alarm is related to the output power and is activated when
there is a relative over-current even when working at low power.
Transmitters in the ADVANCED SERIES include the possibility of REMOTE
control and TELEMETERING by DATA BUS, as well as a series of voltage free,
isolated circuits to control the main parameters. (Optional)
The standard remote control system enables starting and stopping the transmitter
by closing a 12 V DC outside circuit. A switch on the front panel enables selecting
manual or remote operation. When the remote control system is activated it resets the
ALARMS.
Telemetering enables reading all operational parameters of the transmitter by a
data bus. The appropriate module (optional, for either RS-232 or RS-485 signal levels)
provides data on all the readings on the display including Power, Reflected Power,
Amplifier voltage and Current, Operating temperature, all alarm conditions and status of
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the transmitter components. This BUS also enables turning the unit on or off, adjusting
the operating power or resetting the alarms (Remote control by bus).
Incorporating a data concentration unit such as the TELEMETRY ROUTER from
LINK Communicaciones S.A. enables concentrating the data received from other units
the ADVANCED series and transmitting them by modem, cell phone etc. to a control
center.
It is also possible to use a data transmission device such as the SUPERVISOR
EQUIPMENT, from LINK Communicaciones S.A. to transmit messages in a simpler
form such as SMS to a GSM cell phone, and be notified in the event of any failure
condition or to consult any parameter using a cell phone. (This unit also enables remote
start, etc. or any other functions of the transmitter center.)
TRANSMITTERS in the ADVANCED SERIES are normally excited at a power
of about 20-25 W (normal exciters, adjusted to this power). It is possible to excite them
with less than 1W(1W, SERIES 2000 Exciter from LINK Communicaciones S.A.) by
installing a suitable preamplifier module in the transmitter (optional). The transmitter is
already fitted with a suitable slot and connectors for this module. (Reference 022.401-2)
The switched power supply is extremely rugged and includes a system to limit the
maximum current to protect the RF power transistors and the power supply itself.
Stability of the power supply is guaranteed by efficiency within a voltage range of 150
to 250 V.
In addition, the output power is maintained extremely stable by an AGC system
(Automatic Gain Control), which maintains the set power level even though there are
changes in the working frequency, the power supply or the excitation.
The design of ADVANCED SERIES transmitters made a careful study of
operational safety and included REDUNDANCY of the two most vulnerable parts, the
RF power amplifiers and the power supply. At the same time maintenance work was
simplified by the reduced dimensions (3-4 "U" high and 420mmin depth).
Fitting the RF amplifiers with a pluggable circuit board (compatible with other
transmitters from LINK Communicaciones S.A.) makes any eventual cleaning or repair
operations very simple, without any need to remove the unit from the rack and keeping it
operation (at lower power) as the amplifiers are extracted from the front. Access to the
control circuits and some parts of the power supply is also possible from the front panel,
without any need to dismantle the unit. The section dedicated to WIRING DIAGRAMS
and TECHNICAL SETTINGS includes drawings and instructions on how to access the
different parts.
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2.3.1: Amplifier’s power supply:
The power supply is designed under the same principle. It consists of 3 modules
in redundant configuration enabling the transmitter to operate at the same or slightly
reduced power with one of them off-line. These modules are also removed from the
front and this operation may be performed with the unit in operation.
The power supply unit can work with up to 4 modules simultaneously. The
modules are connected to a “Blackplane”, including a control circuit of the modules. In
the unit of 1Kw FM Transmitter Series Advanced, the power supply has 3 modules of
48V voltage output dc, and 15Amp per unit, each one connected to the Backplane.
The 1Kw FM power amplifier unit, drains 30 Amp approximately of DC, and
each module is giving 10 Amp. (66% of the nominal intensity of each module).
If one module fails the Backplane control circuit, will order the 2 active modules
to give 100% of power output, therefore the transmitter still receive 30 Amp. required
for the correct function of the unit.
The modules of the power supply can be plug-in and plug-out, in hot. When
the fail module is exchanged, the power supply control circuit will return to the
initial status, giving each module again 10Amp DC. This power supply is used
mainly for repeaters transmission centers of mobile phones, which are using
thousands of units.
Amplifier’s Power supply (4 Sluts)
The rectifier modules provide unprecedented power density and power levels in a
true plug and play format. With a wide range of available voltages, power ratings, and
form factors, the rectifiers provide optimal and cost effective solutions for your power
needs.
We have used 3 sluts power supply for 1KW amplifier unit.
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Amplifier’s power supply (one slut), from top
The advantages:
Optimization – The Power rectifiers are optimized for the demanding power
needs of wireless communications, enterprise and broadband access equipment.
SMALL SIZE, BIG POWER – These compact 1RU rectifiers can provide up to
2500 Watts of power. The small size frees up space to reduce system size or incorporate
additional electronics.
Industry Leading Efficiency – An industry leading 93% efficiency reduces the
thermal load thus improving the overall reliability and availability of the system.
Flexibility – These rectifiers are designed to operate as an integral component in
Valere’s Enterprise DC Power Systems. They are extremely flexible and can be operated
either with a system controller or as a stand-alone module in enterprise applications.
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The features:
• Small 1RU Footprint
• Output Voltages from 12V to 48V
• Output Power up to 2500W
• Typical efficiency 93%
• Wide Range Operating Temperature (from -40°C to +70°C)
• Universal AC Input
• Power-factor Correction
• Hot-Pluggable
• Redundant Parallel Operation
• Active Load Sharing
• NEBS Level 3 Certified
• UL60950 Recognized
• CSA C22.2 No. 60950-00 Certified
• VDE EN60950 Certified
• Advanced Internal Monitoring
AC Input Wire Sizing:
This system utilizes an individual feed AC architecture (Figure 1) via a rear IEC 319.
Individual Feed AC Wiring Architecture
Each rectifier is fed by an individual AC breaker and cord as seen in the figure above.
See Table 3 for breaker and wire sizing.
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DC Output Wire Sizing:
There are two main considerations for sizing DC wire, ampacity and voltage drop.
Ampacity refers to a safe current carrying level as specified by non-profit organizations
such as Underwriters Laboratories and the National Fire Prevention Association, which
publishes the National Electric Code. Voltage drop is simply the amount of voltage loss
in a length of wire due to ohmic resistance of the conductor. DC wire may be sized for
either ampacity or voltage drop depending on branch load loop length and conductor
heating. In general, ampacity considerations will drive wire selection for short loop
lengths (less than 50 feet) and voltage drop will drive wire selection for long loop
lengths (greater than 50 feet). The National Electric Code table 310.16 provides
ampacity values for various sizes, bundles, and insulation temperature rated wire.
DC Wire Diagram
Each system is equipped with two double hole lug DC connection pads located on
the rear of the shelf as shown in Figure 2. Select a wire size for each position according
to plant current rating as shown in Table 4. If the shelf is to receive additional rectifiers
at a later date, select wiring for the maximum future installation. This shelf is not
designed for connection to a battery system without the use of an external distribution
panel. The polarity of the system is universal; therefore the polarity of the output is
determined by the system grounding. Ground the system on the return bus bar.
AC input
Plug in the appropriate cord in to the AC connections on the back of the shelf.
DC Output
DC connections are accomplished via the two rear bulk output connection as shown in
the photo below.
Connections are made using double hole lugs with 5/8” spacing and ¼” hole size. Select
wire and lug sizes according to section “DC Output Wire Sizing”.
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SHELF DIMENSIONAL DRAWINGS:
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Rectifier Removal
ENVIRONMENTAL CHARACTERISTICS:
Parameter
Min Max Unit
Storage Temperature
-40 85
°C
Operating Temperature -40 70
°C
Humidity
Altitude
5
95
%
-200 8000 Ft
Technical proposal for 1KW FM Transmitter / Option A
Notes
Full power -40°C to +50°C; output
power derates 2%/°C above 50°C.
Relative Humidity Non Condensing
For operation above 8000', maximum
temperature is derated 2°C per 1000'
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3: Transmitter Installation working
3.1) Exciter
PUTTING INTO OPERATION:
Program the operating frequency.
Connect the STEREO AUDIO signal using male XLR connectors, Left Channel (A) in
►13 and Right Channel (B) in ►23.
Ensure that the slider switch ►20 is set to INTERNAL MPX CODER.
Connect RF OUTPUT ►15 to the antenna using a male "N" connector (use RG-213
cable or better).
Place a jumper between the central and right screws of ►18, or connect them to the
external power output interlock (closed: power ON, open: power OFF).
Connect the power supply cable to ►24 and to the mains supply with earth connection.
Switch ON using ►8, and ►8 (red) and ►7 (green) will come on and after a few
seconds 6 will change from red to green (PLL locked).
Set selector ►3 to PWR. Meter ►2 will indicate the output power, which can be
adjusted with screw ► 4 (DO NOT EXCEED25W).
With ►3 set to REFL check that the reading is less than 25W ("min" signal) in ►2. If
the reflected power is excessive, 5 will come on red.
Set ►3 to VOLT. Check that reading ►2 is 15V.
Set ►10 to MOD. The LED bar ►1 will indicate the modulation level.
a) If an audio signal (100% or 0dB VU) is available, adjust ►9 (first remove the black
threaded plug) so that ►1 indicates 0 dB.
b) If only the program signal is available, then adjust 9 so that the modulation peaks do
not exceed 0dB on the LED bar ►1.
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Use switch ►11 to select MONO or STEREO transmission.
For use of the items marked ►10, ►12, ►14, ►19, ►20, ►21 and ►22 see the
section "APPLICATIONS".
(*) See the connections for the XLR connector on the rear panel.
The input impedance may be selected between 600 and 5kOhms internally.
3-2) 1KW FM Transmitter
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PUTTING INTO OPERATION
Connect the SWITCHED POWER SUPPLY to ►13. Connect the 48 V DC power
supply to the thick connection strips using wires that are as short as possible and 68mmin section. RESPECTTHE POLARITY!
Connect the SWITCHED 220 V AC + EARTH POWER SUPPLY to the 3 small
connection strips using wires of 1.5 to 2mmin section.
Connect the RFOUTPUT16 to the antenna using a "7/16" male connector (Use
“celflex"1/2" cable or equivalent).
Connect the output from the EXCITER to the excitation input ►18 using male "BNC"
connector (Use RG-58 cable).
NOTE: The EXCITER must supply 20-25W if the TRANSMITTER is not fitted with a
driver stage, or 1-2W if the TRANSMITTER has a driver stage.
Connect the EXCITER power supply to ►19 using a male "IEC" connector.
Connect the FM TRANSMITTER to the network, ►21, using a cable of not less than
2.5 mm in section + earth. Place the fuses in ►22.
Turn the unit on:
Connect the TRANSMITTER with ►8. The DISPLAY and ►8 will light.
Place ►7 in the "MANUAL" position.
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Press button ►9 "ON", ►6 and ►9 will light up in green, the ventilator and the
EXCITER will start.
Check the DISPLAY for POWER, VOLTAGE, CURRENT:
The VOLTAGE should be 48±1 V.
The POWER should not exceed 1 kW. Otherwise the indication will flash.
The REFLECTED POWER should not exceed 50W. Otherwise it will flash.
The CURRENT should not exceed 35 A. Otherwise it will flash.
Adjust the POWER by pressing ►10 for more than 2 sec and then pressing 3 to increase
or reduce the power.
In the event of excess REFLECTED POWER, CURRENT, or TEMPERATURE the
TRANSMITTER will lock and ►4 will light up in red.
UNLOCKTHE TRANSMITTER by pressing ►5.
The use of components ►7, ►11, ►15, ►20 and ►12 is described in the
"Application”.
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4: TECHNICAL SPECIFICATIONS
4-1) FM Exciter
Technical specifications
SPECIFICATIONS
TARNSMISSION:
WORKING FREQUENCY MHz
STABILITY OF FREQUENCY
CHANNEL SEPARATION (SYNTH.)
GENERATION OF CARRIER
DEVIATION AT 1KHz AND 0 dB.
TYPE OF MODULATION
TYPE OF MODULATION
MPX INPUT FOR 100% MOD.
SUBCARRIER INPUT FOR 100% MOD.
MPX RESPONSE 40-75000 Hz
SUBCARRIER RESPONSE
FM NOISE REFERRED TO 100% TYP.
DISTORT. AT 1KHz AND 100% MOD.
MONO OPTION:
AUDIO INPUT FOR 100% MOD
DISTORT. AT 1KHz AND 100% MOD.
FM NOISE REFERRED TO 100% TYP.
AUDIO RESPONSE
STEREO OPTION:
AUDIO INPUT L/R, 100% MOD
CROSSTALK L-R
DIST. L/R AT 1KHz AND 100% MOD.
S/N RATIO L/R
AUDIO L/R RESPONSE
PILOT FREQUENCY
PILOT LEVEL
PILOT OUTPUT (R.D.S. SYNCRO.)
RADIOFREQUENCY:
NOMINAL OUTPUT POWER
HARMONICS LEVELS
SPURIOUS LEVEL
MISCELLANEOUS:
ALARMS (EXCESS OF:)
COOL SYSTEM (25W)
POWER SUPPLY VOLTAGE
WORKING MARGIN
POWER DRAIN (25W)
19” Rack normalized
87,5 / 108 MHz
±5 x 10-6
10 KHz, Steps ** (noise increase)
Frequency Fundam. Oscillator
±75 KHz
(AUDIO) 180 F3
(MPX) 256 F3
Assym./Imp.1K5/Sens./1.4/5.5 Vpp
Assym./Imp.1K/Sens.-6/+10 dBm
± 0,2 dB.
20-100 KHz ± 1 dB
<-75dB"C" curve (180 F3) and Desen
0,03% with de-emphasize 50µs (typ.)
"Symm./Z: 600/5000 ohms; 0/+15 dBm
0.040% with De-emphasize 50µs(typ.)
<-75dB"C" curve and De-emphasize
30-15000 Hz ± 0.5 dB Pre-emp./ De-emph.
"Symm./Z: 600/5000 ohms; 0/+15 dBm
< 45 dB.
<0.08%
<-70dB "C" curve and de-emphasize
30-15000Hz ± 0.5dB Pre-emp./ De-emph.
19000Hz ± 1Hz
9-10%
0dBm
25W.(Adjustable from 20->100%)
<-70dB
< - 70 dB.
S.W.R.,
Convection
220 Vc.a.(110 Vc.a. on request)
205 - 235 V (typical 195 – 260 V.)
70 W
19" RACK 2U (88mm) and 215 depth
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4-2) 1KW FM Stereo Transmitter
Technical specifications
SPECIFICATIONS
TARNSMISSION:
Operating FREQUENCY MHz
ADJ. REQUIRED ON CHANGING FREQ.
RATED POWER
ADJUSTMENT MARGIN
NON-ESSENTIAL SIGNAL LEVELS
OUTPUT IMPEDANCE
POWER STABILITY, V ±10 %
OUTPUT CONNECTOR
EXCITATION (WITHOUT DRIVER STAGE)
- EXCITATION (WITH DRIVER STAGE)
EXCITATION CONNECTOR
TRANSMISSION SPECIFICATIONS
POWER SUPPLY:
POWER SUPPLY
OPERATING SECURITY
Dc POWER SUPPLY
Dc RATED CURRENT
Ac POWER SUPPLY
VOLTAGE MARGIN WITHOUT VARIATION
Ac RATED CURRENT
AVERAGE CONSUMPTION (WITHOUT EX.)
VARIOUS:
SWITCH ON/OFF OPERATION
OPERATING INDICATIONS
MEASURED PARAMETERS
DISPLAYED INFORMATION SITUATION
ALARMS.
COMUNICATION
REMOTE MEASUREMENTS BY BUS
REMOTE CONTROL CAPACITY BY BUS
ISOLD. CIRC. REMOTE CONTROL
ISOLD. CIRC. INFORMATION
MECHANICAL:
POWER STAGE FORMAT
VENTILATION
WEIGHT WITH PACKAGING
POWER SUPPLY FORMAT
WEIGHT WITHOUT PACKAGING
87,5 / 108 MHz
No, wide band circuits
1000W
100-1000W
<-65dB
50ohms.
< - 0,1 dB.
"7/16" Female
> 22 W.
>0.5W
“BNC” female
Those of the EXCITER
Switched mode converter
Redundant, 3 modules
48V ±1V
33A
220V
150-250V
8A (at 220V)
1700W
Manual or remote
By alphanumeric L.C.D DISPLAY
Dir./Refl. PWR, V, A, and Temp.
Final amp.,exc, operating hours, remote control on
off bus, alarms
Excess: reflected, current, temp
RS-485 or RS-232
All display indication
On/off, power: Up/Down - Reset
On/off
Manual / remote, power drop,Tx activated, mains
present
19" Rack 4 "U" (178mm), 420mm depth
Forced, Direction: Front->rear
18Kg
19" Rack 1 "U" (45mm)
11Kg
Technical proposal for 1KW FM Transmitter / Option A
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5- DRAWINGS
Technical proposal for 1KW FM Transmitter / Option A
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EXCITER Initial Diagram
Technical proposal for 1KW FM Transmitter / Option A
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EXCITER Circuit Diagram
Technical proposal for 1KW FM Transmitter / Option A
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Changeover Circuit Diagram
Technical proposal for 1KW FM Transmitter / Option A
33/38
Changeover Internal Layout
Technical proposal for 1KW FM Transmitter / Option A
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1KW Amplifier General Diagram
Technical proposal for 1KW FM Transmitter / Option A
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500W Amplifier Card Circuit Diagram
Technical proposal for 1KW FM Transmitter / Option A
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MONITORING RACK:
Monitoring Rack
Technical proposal for 1KW FM Transmitter / Option A
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Monitoring Rack for 1KW FM TX – LOM:
Item DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
40U 19" Rack 60 x 60 cm
2U Electric panel, with wiring and switches
FM professional Receiver
Professional Audio Stereo Decoder (demodulator)
Audio Distribution Amplifier, (two stereo inputs and six outputs)
Audio Patch panel
Audio Limiter (Limiter compressor)
Test Patch Panel R.F. With N connectors 10 In/out
Audio Amplifier, w/ Speakers
U-Link 5 ports
Dummy Load Resistance (for 1Kw)
RF patch panel
Technical proposal for 1KW FM Transmitter / Option A
Quantity
1
1
1
1
2
1
2
1
1
1
1
1
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