Aeroflex | 2948 | 2948B Low Noise Communications Service Monitor Data Sheet

Wireless
2948B Low Noise Communications Service Monitor
All the benefits of the 2945B but with a low phase noise signal generator,
for more critical receiver testing
•
Low phase noise signal generator
Field Operation
•
High stability reference oscillator (OCXO)
as standard
•
Accurate power measurement to 150 W
•
Transient and harmonic analysis
At under 12 kg the 2948B lightens the load to remote sites. The
shape of the 2948B is ideal for carrying; the side handle ensures that
the instrument is clear of the stairs when ascending buildings and
the 2948B’s depth is suitable for the instrument to be operated comfortably when it is placed on the floor.
•
Color transflective superfast LCD with
rapid refresh rate for easy monitoring and
real time adjustment
•
Tracking generator with full offset
tracking
•
Full span spectrum analyzer with ‘live’
look and listen
The 2948B Communications Service Monitor is
the lightest, most rugged service monitor available with low phase-noise signal generation.
For field work, the 2948B provides an excellent
combination of instruments for all types of
maintenance work. In the workshop it provides
all of the performance you would expect for
exacting measurements.
A large color transflective (improved sunlight readable) display aids
operation under harsh viewing conditions. An optional bail arm handle is also available. This option allows a stowage cover to be fitted
over the front panel for storage of adapters and further protection to
the instrument’s front panel. A selection of cases are available
including a hard transit case, standard soft carrying case or an integrated soft carrying/operational case allowing full operation without
removal from the protective case.
Stored settings may be recalled from internal memory or from a
memory card allowing fast and straightforward set up.
Fast Full Performance Spectrum Analyzer - Provided As
Standard
Low Phase-Noise Signal Generator
The 2948B differs from its 2945B ‘cousin’ by providing a low phase-noise signal generator as standard. This enhanced capability allows accurate
measurement of the noise characteristics of all
FM receivers and is especially beneficial when
making accurate measurement of narrow band
receivers. The performance of the 2948B enables
signal-to-noise measurements of better than
46 dB to be made on receivers with 12.5 kHz channel spacing.
The spectrum analyzer provides spans from 100 Hz per division to
100 MHz per division and also has a fully adjustable reference level.
Speed is comparable with analog analyzers, allowing real time adjustments over the displayed dynamic range. With the tracking genera-
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tor provided as standard, duplexers and filters can be aligned quickly
and easily. An offset facility provides testing of equipment with frequency translation. Channel stepping can be performed by defining
an increment and then using the FREQ ×Økeys. This is particularly useful when testing multi-channel systems.
Printing and Post Analysis
Live Look and Listen
A screen capture facility is available so any screen displayed on the
2948B can be saved direct to a PC via the serial port as a bit map file.
This feature puts the 2948B above all of its peers with the ability to
examine signals on the screen and demodulate them simultaneously.
Intermittent interference can be isolated quickly and the signals then
easily identified. The trace can be saved to the memory card along
with the time and date, providing factual evidence that can be recalled
later. This feature is particularly useful when looking for rogue transmissions, especially on busy base station sites.
From 2 µV to 150 Watts
The 2948B measures the power of low level signals such as those
encountered when monitoring off-air signals or those found when
probing a circuit. 150 Watts measurement is provided without the
need for external attenuators so the high power of base stations can
be measured directly. Measurement accuracy of better than 10% is
guaranteed all the way down to 5 mW on the N-Type connector, allowing cellular radios to be qualified at low power levels.
Accurate RF Signals
The signal generator provides coverage from 400 kHz to 1.05 GHz
with +5 dBm output (+7 dBm overrange) and fast switching speed.
Level accuracy is ±2 dB at all levels above -127 dBm.
With the parallel printer port interface, screen dumps, automatic test
results or previously stored results may be sent to most parallel printers. These facilities are available as standard using the serial RS-232
interface.
A single trace dump command allows fast transfer of the spectrum
analyzer, OBW or transient analysis trace to be transferred as 249
ordinate values for detailed post-proccessing and analysis.
Autorun - internal control
With the Analog Systems Card fitted, automatic testing without an
external controller is possible. Custom tests may be written and run
by the operator. Four programmable relay contacts are provided with
the optional parallel printer interface. This allows remote control of
radios or test fixtures from built-in automatic tests.
Custom Programs
Users may program the instrument to suit their own specific needs.
This is possible either by configuring any of the range of built-in programs or by using the MI-BASIC interpreter to produce a customized
test program that can be executed internally, without an external controller.
Duplex - provided as standard
Full duplex operation is provided by the 2948B. This allows testing of
duplex radios as well as simultaneous testing of repeater transmit and
receive paths. There are no restrictions to the duplex offset.
Memory Card - with real time clock
The memory card drive meets the PCMCIA standard format for PC
cards. The 2948B provides a DOS based filing system that allows
transfer of information to a PC fitted with a memory card slot.
Test setups, test results, screen dumps, spectrum analyzer
coordinates, and test sequences can all be stored on the memory card,
allowing information to be easily stored and retrieved when required.
PMR, Trunking and Cellular
The 2948B provides extensive support for the various tone signaling
systems used in Professional Mobile Communications such as
DTMF, TONE REMOTE (Option), DCS and CTCSS. Also a highly
flexible user defined system enables the instrument to be configured
to accommodate a wide variety of other tone formats that are in use.
Additionally trunked networks are supported with network signaling
protocol simulations for MPT-1327/1343, LTR (available Oct 05) and
EDACS radio / repeater measurements. Legacy analog cellular standards are also available internally and include AMPS, TACS and
NMT with all country variants provided.
Remote Control - RS-232 or GPIB
Remote control is provided, with an RS-232 interface as standard. An
IEEE-488.2 interface (option 5) can be fitted where other instruments are required to operate in a system with the 2948B.
Reliability
The 2948B features high integration and a chassis designed to maximize mechanical protection.
Audio Analysis
A comprehensive and expanded range of filter selection is provided as
standard, including band pass, low pass and high pass. Optional filters are available for psophometric weighting of audio signals and
demodulation of signals in a simulated radio channel bandwidth.
The direct measurement of CTCSS is possible with the 300 Hz LP
filter, even with speech present.
The standard 1 kHz notch filter provides for normal
distortion/SINAD measurements. Additional notch filters can be
added to enable distortion/SINAD measurements for signals in the
range 50 Hz to 20 kHz where required.
Two comprehensive audio generators are provided as standard for
internal modulation or audio sources for transmitter stimulus.
External DC coupled FM is provided.
Comprehensive Oscilloscope
Analysis of audio signals, whether from the demodulated signal or the
audio input direct can be viewed for further inspection. The oscilloscope can either be combined with the measurement screen in the
Tx, Rx or AF test modes or ‘zoomed’ to a full screen display.
Different levels of persistence can be selected to allow short or long
term effects to be captured.
SPECIFICATION
RF SIGNAL GENERATOR
FREQUENCY
Frequency Range
400 kHz to 1.05 GHz
Resolution
10 Hz
Indication
10 digit display
Transient Analysis
The ability to capture transients on the rising or falling edge of a
waveform provides a valuable tool for fault finding radios and radio
systems. The user has full control of the trigger level and input attenuation as well as the timebase and five fixed trigger points, making
this feature simple and flexible to operate.
Setting
Keyboard entry, delta increment/decrement function and rotary control
Accuracy
As frequency standard
OUTPUT LEVEL
Harmonic Analysis
An automatic harmonic analysis function is included in the 2948B.
This complements the fast spectrum analyzer and allows a rapid
check that the transmitter under test is not producing any excessive
harmonics.
Output Level Range
Rx Test:
N-Type socket: -141 dBm to -21 dBm
BNC socket: -115 dBm to +5 dBm (overrange to +7 dBm)
Tones Generation and Decoding
The tones menus include full remote control so that radio workshops
can further automate their tasks. It is possible to enter tones durations of up to 20 seconds directly, simplifying operation with some of
the more extreme tones systems in use. These and other improvements are in response to user feedback and allow better control of the
tones from the top level screens.
POCSAG Decode - built in option
Off-air decoding of POCSAG signals is provided as an option.
Resolution
This allows tone, numeric and alphanumeric messages to be displayed. Signals with bit rates of up to 4800 bits/s can be automatically decoded making the 2948B an ideal surveillance tool. The 2948B
can be set to detect all messages, a user selectable RIC (just like a
pager) or a fixed message string.
0.1 dB
Indication
4 digits plus sign (dBm, dBµV, µV, mV PD/EMF)
Accuracy
±2 dB for level above -127 dBm on N-Type socket up to 1 GHz
Atten Hold Facility (CW and FM modes only)
Allows user to define start point for seamless generator operation
across a range of up to 20 dB (guaranteed 10 dB minimum)
Reverse Power Protection
N-Type: 50 W 10 minutes, normal operation. 150 W for 1 minute at
20°C.
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Overload indicated by audible and visual warning
AMPLITUDE MODULATION - EXTERNAL
BNC: 5 W Overload indicated by audible and visual warning
Input Impedance
Output Impedance
Nominally 50 Ω
VSWR
N-Type
Better than 1.2:1 up to 500 MHz
Better than 1.35:1 up to 1.05 GHz
BNC
Better than 2.2:1 up to 1.05 GHz
SPECTRAL PURITY
Residual FM
Less than 6 Hz RMS (0.3 to 3.4 kHz) up to 500 MHz
Less than 12 Hz RMS (0.3 to 3.4 kHz) up to 1.05 GHz
Nominally 10 kΩ in parallel with 40 pF
Frequency Range
As internal AM
Modulation Frequency Range
As internal AM
Sensitivity
1 V RMS for 100% AM
FREQUENCY MODULATION - INTERNAL
Frequency Range
400 kHz to 1.05 GHz
Maximum Deviation
75 kHz
Harmonics
Indication
-25 dBc
3 digits
Spurious Signals
Better than -50 dBc
SSB Phase Noise (20 kHz offset)
Setting
Keyboard entry, delta increment/decrement function and rotary control
Accuracy
(1)
Better than -112 dBc/Hz up to 500 MHz
±7% at 1 kHz modulating frequency
Better than -108 dBc/Hz up to 1 GHz
±10% at modulating frequencies from 50 Hz to 15 kHz
RF Carrier Leakage
Less than 0.5 µV PD generated in a 50 Ω load by a 2 turn loop
25 mm from the case. Output level less than -40 dBm into a sealed
50 Ω load.
AMPLITUDE MODULATION - INTERNAL
Frequency Range
400 kHz to 1.05 GHz
AM Depth Range
0 to 99%
Resolution
1%
Indication
2 digits
Setting
Keyboard entry, delta increment / decrement function and rotary control
Accuracy
For carrier frequencies from 1.5 MHz to 400 MHz
±5% at 50% for modulation frequency of 1 kHz
±7% ± 1 digit for modulation frequency of 1 kHz
±15% ±1 digit for modulation frequencies from 50 Hz to 15 kHz
Distortion
Less than 2% at 1 kHz for 30% AM, CCITT weighted
Modulation Frequency
5 Hz to 33 kHz
Distortion
Less than 1% at 1 kHz for deviation of 5 kHz, CCITT weighted
Modulation Frequency Range
5 Hz to 33 kHz
Resolution
25 Hz
Pre-emphasis
750 µs selectable
FREQUENCY MODULATION - EXTERNAL
Input Impedance
Nominally 10 kΩ in parallel with 40 pF
Frequency Range
As internal FM
Modulation Frequency Range
DC to 100 kHz
Pre-emphasis
750 µs selectable
Sensitivity
1 VRMS for 0 to 75 kHz deviation
MICROPHONE INPUT
Input Level
2 mV to 200 mV (AGC levelled)
Input Impedance
Nominally 150 Ω
Accuracy
Press To Talk (PTT)
When using the optional microphone in Tx Test mode, the PTT will
switch instrument to Rx Test.
± 1 dB
Sensitivity
50 mV (100 mV for 40 dB SINAD) reading suppressed if audio voltage
is less than 5 mV
AUDIO VOLTMETER
Input Impedance
AUDIO DISTORTION METER
Nominally 1 MΩ in parallel with 40 pF
Frequency Range
Frequency
DC and 50 Hz to 50 kHz AC only 50 Hz to 50 kHz Polarized DC (below
1 Hz)
Maximum Input Voltage
0 to 10% and 0 to 30%
30 VRMS, 50 Vdc
Resolution
Level Ranges
0.1% distortion
0 - 100 mV to 0 - 100 V RMS in a 1, 3, 10 sequence
Indication
Digital readout also in mW, dBm, dBV, dBr (user selectable)
3 digits and bar charts
External load R selectable compensation for 4, 8, 16, 75, 100, 150,
300, 600 Ohms
Peak hold facility
1 kHz (additional frequencies available with option 29)
Range
Accuracy
±1 dB of reading ± 0.5% distortion
Sensitivity
Resolution
1 mV or 1% of reading
50 mV (100 mV for 1% distortion) reading suppressed if audio voltage
is less than 5 mV
Indication
3 digits and bar chart
Accuracy AC
±3% ±3 mV ± resolution up to 30 V RMS
Accuracy DC
±1% +50 mV up to 40 V
AUDIO FREQUENCY METER
AUDIO S/N METER
Range
0 to 30 dB and 0 to 100 dB
Resolution
0.1 dB
Indication
3 digits and bar chart
Frequency Range
20 Hz to 50 kHz
Resolution
Accuracy
±1 dB
Sensitivity
0.1 Hz, less than 10 kHz 1 Hz, at 10 kHz and above
Indication
5 digits
50 mV (100 mV for 40 dB S/N) reading suppressed if audio voltage is
less than 5 mV
AUDIO OSCILLOSCOPE
Accuracy
As frequency standard ± 1 digit ± resolution
Operating Modes
Single or repetitive sweep
Sensitivity
Frequency Range
50 mV
DC to 50 kHz, 3 Hz to 50 kHz AC coupled
AUDIO SINADMETER
Voltage Range
10 mV to 20 V per division in a 1, 2, 5 sequence
Frequency
1 kHz (additional frequencies available with option 29)
Voltage Accuracy
±5% of full scale
Range
0 to 18 dB and 0 to 50 dB
FM Ranges
±75, 30, 15, 6, 3 and 1.5 kHz deviation full scale, ±10% accuracy
Resolution
0.1 dB
AM Ranges
20, 10 and 5% per division, ±10% accuracy
Indication
3 digits and bar charts
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Timebase
50 µs/div to 5 s/div in a 1, 2, 5 sequence
Graticule
10 Horizontal by 6 Vertical divisions
Special Features
VSWR
N-Type: Better than 1.2:1 up to 500 MHz
Better than 1.25:1 up to 1.05 GHz
BNC: Better than 3:1 up to 1.05 GHz
RF POWER METER (BROADBAND)
Built in anti-aliasing circuitry and variable decode trigger level
Frequency Range
AUDIO BAR CHARTS
Bar chart Displays
AF Voltage, SINAD, Distortion, S/N
Vertical Resolution
2% of full scale
Ranging
Auto-ranging, range hold or manual selection
1, 2, 5, sequence with hysteresis
Audio and Modulation Filters
Lowpass filters
200 kHz to 1.05 GHz
Dynamic Range
5 mW to 150 W (N-Type)
0.05 mW to 250 mW (Antenna port)
Indication Units
Watts, dBm or dBW
Indication
3 digits or bar chart
Resolution
0.1 dB max, typically 1%
Four independently configurable Lowpass filters LP1, LP2, LP3, LP4
that can be set to any frequency cut off point from 250 Hz to
20000 Hz (excluding the band 1001 Hz to 2999 Hz)
Accuracy (N-Type)
50 kHz Lowpass (No filters applied)
Maximum Continuous Rating
±10% ± resolution up to 1 GHz (FM & CW)
750 µs de-emphasis
N-Type: 50 W at 20 °C
Highpass filters
BNC output: 5 W
50 Hz Highpass, 300 Hz Highpass
Bandpass filters
Any combination of LP1, LP2, LP3, LP4 and the Highpass filters
Audio Analyzer General Features
Antenna port: 1 W
Intermittent Rating
N-Type: 150 W for limited periods, typically 1 minute at 20 °C
Overload indicated by audible and visual warning
Tones Mode
RF FREQUENCY METER
Frequency Range
400 kHz to 1.05 GHz (manual tune)
10 MHz to 1 GHz (auto-tune)
Resolution
1 Hz or 10 Hz, up to 1050 MHz, selectable
0.1 Hz, 1 Hz or 10 Hz up to 999 MHz, selectable
Indication
Up to 10 digits
Accuracy
As frequency standard ± resolution
Acquisition Time
Less than 1 second (manual)
Typically 3 seconds (auto-tune)
Sensitivity
Auto-tuned 5 mW (N-Type) 0.05 mW (Antenna port)
Manual Tuned:-34 dBm (N-Type) -60 dBm (Antenna port)
Auto or manual control of input attenuator
HARMONIC AND TRANSIENT ANALYSIS
Harmonic Measurement
Displays 1st to 5th harmonic of the selected carrier
Maximum Harmonic Frequency
1.05 GHz
Dynamic Range
0 to -60 dBc
TRANSIENT POWER ANALYSIS
Displays power profile against time
Frequency Range
1 to 1050 MHz
Demodulation Distortion(1)
Dynamic Range
Less than 2%, at 1 kHz and 30% AM, (CCITT weighted)
60 dB below spectrum analyzer reference level
Residual AM
Scale (power)
Less than 1% (300 Hz to 3.4 kHz)
10 dB/div
Demodulation Output
Scale (time)
50 mV peak to peak for 1% AM
50 µs/division to 5 s/div
FREQUENCY MODULATION
Trigger Level
Adjustable over full dynamic range +ve or -ve trigger selection
Frequency Range
400 kHz to 1.05 GHz
Pre-trigger
0, 25, 50, 75 or 100% of displayed period
Modulation Frequency Range
10 Hz to 15 kHz
MODULATION METER
Deviation Range
Sensitivity
0 to 75 kHz
Auto-tuned: 5 mW (N-Type)
Peak hold facility
0.05 mW (Antenna port)
Resolution
Manual Tuned:-34 dBm (N-Type)
10 Hz below 2 kHz deviation
-60 dBm (Antenna port)
1% above 2 kHz deviation
Auto or manual control of input attenuator
Indication
Audio and Modulation Filters
3 digits and bar chart
Lowpass filters
Accuracy(1)
Four independently configurable Lowpass filters LP1, LP2, LP3, LP4
that can be set to any frequency cut off point from 250 Hz to
20000 Hz (excluding the band 1001 Hz to 2999 Hz)
A 50 kHz Lowpass (No filters applied)
750 µs de-emphasis
Highpass filters
50 Hz Highpass, 300 Hz Highpass
Bandpass filters
Any combination of LP1, LP2, LP3, LP4 and the Highpass filters
AMPLITUDE MODULATION
Frequency Range
400 kHz to 1.05 GHz
Modulation Frequency Range
10 Hz to 15 kHz
AM Depth Range
0 to 99% (manually tuned)
0 to 90% below 100 MHz
0 to 80% from 100 to 400 MHz
Peak hold facility
Resolution
±5% ± resolution at 1 kHz modulation frequency
±7.5% ± resolution for modulation frequencies 50 Hz to 10 kHz
Demodulation Distortion
Less than 2% at 1 kHz and 5 kHz FM, (CCITT weighted)
Residual FM
Less than 30 Hz (300 Hz to 3.4 kHz)
Demodulation Output Socket
200 mV peak to peak ±10% per 1 kHz deviation
RF SPECTRUM ANALYZER
Frequency Range
400 kHz to 1.05 GHz
Spans
1 kHz/division to 100 MHz/division in a 1, 2, 5 sequence or continuously variable
Start - stop facility allows selection of infinitely variable span width
Resolution Bandwidth
300 Hz, 3, 30, 300 kHz, 3 MHz
Reference Level (top of screen)
-50 dBm to +52 dBm 0.7 mV to 71 V
1% AM
Displayed Dynamic Range
Indication
80 dB
2 digits and bar chart
Accuracy(1)
Noise floor
Typically 75 dB below top of screen
±5% ±1 digit at 1 kHz
±8.5% ±1 digit from 50 Hz to 10 kHz
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Typically ±2 dB ±1 resolution (10 dB/div) 10 dB above noise floor
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trol
Vertical Resolution
0.1 dB on 2 dB/division
Indication
4 digits
0.5 dB on 10 dB/division
Resolution
Level Flatness
0.1 mV below 409 mV
±2 dB ± resolution (10 dB/div)
1 mV above 409 mV
Intermodulation Distortion
Better than 70 dB for two signals at -30 dBm into first mixer
± 5% + resolution 50 Hz - 15 kHz
Sweep Speeds
10 ms/div to 200 ms/div in a 1, 2, 5 sequence (optimum sweep speed
and bandwidth selected according to span or user selectable)
Span
10 kHz
100 kHz
1 MHz
10 MHz
100 MHz
1000 MHz
Accuracy
Resolution
Bandwidth
300 Hz
3 kHz
30 kHz
300 kHz
300 kHz
3 MHz
Update
(Sweeps/sec)
5
9
9
9
5
5
Marker Indication
Level and frequency or delta marker from center line of screen
Single marker for frequency and level display
Marker to center frequency marker
Features
Simultaneous ‘Look and Listen’ spans 100 kHz, 200 kHz, 500 kHz,
1 MHz
Sensitivity
2 µV
Tracking Generator Offset/Frequency Range
0-999 MHz/400 kHz to 1000 MHz
AUDIO GENERATORS
FREQUENCY
Frequency Range
5 Hz to 33 kHz (sine or square)
Setting
Keyboard entry, delta increment / decrement function and rotary control
Indication
5 digits
Resolution
0.1 Hz below 3.25 kHz
1 Hz above 3.25 kHz
Accuracy
0.01 Hz below 180 Hz, 0.1 Hz above 180 Hz
LEVEL
Level Range
0.1 mV to 4 VRMS
Setting
Keyboard entry, delta increment / decrement function and rotary con-
Output Impedance
Nominally 5 Ω (minimum load 25 W)
Distortion
Less than 0.5% at 1 kHz
Less than 1% from 50 Hz to 15 kHz
Signaling Encoder/Decoder
Sequential tones functions including revert User defined tones
Encodes and decodes up to 40 tones. CCIR, ZVEI, DZVEI, EEA, EIA or
user defined. Any of the tones may be extended. Continuous, burst
and single step modes available. Up to two frequency plans may be
defined and stored within the 2948B for sequential tones. Any of the
standard tone frequency plans may be copied to user defined and
modified.
Tone length 20 ms to 20 s
Standard tone frequencies may be selected from a menu
Generation and decoding of DTMF tones
Generation and decoding of DCS (Digitally Coded Squelch)
Generation of POCSAG code CCIR No.1 Rec 584. Bit rates from 400
to 4800 bit/s. Inversion available.
AUDIO MONITOR
Demodulated signals and audio signals may be monitored via the internal loudspeaker and the accessory socket output on the front panel.
CELLULAR AND TRUNKING
Test Modes
Auto test/manual test
Auto Test Programs (dependent upon which system in use)
Call processing only Call and RF testing Brief testing Comprehensive
testing
Parametric Auto Test Routines
AF Frequency
FM Deviation
Rx Distortion
Rx sensitivity
Rx S/N
Tx Distortion
Tx Level
Tx Limiting
Tx Noise
AF Level
Mod frequency
Rx expansion
Rx SINAD
Tx Compression
Tx frequency
Tx Power Level
Tx Mod Level
Tx SINAD Tx S/N
Signaling Auto Test Routines
Registration/Roaming Update
Place Call
Page Mobile
Clear from Land
Clear from Mobile
PTT On
PTT Off
SAT Deviation
SAT Frequency
ST Duration
Handoff
Hook Flash
DTMF Decode
Data Performance
89/336/EEC. Complies with the limits specified in the following standard:
ST Frequency
ST Frequency
ST Deviation
DSAT Deviation
IEC/EN61326-1 : 1997, RF Emission Class B, Immunity table 1,
Performance Criteria B
Safety
FREQUENCY STANDARD
Conforms with the requirements of EEC Council Directive 73/23/EEC
(as amended) and the product safety standard IEC / EN 61010-1 :
2001 + C1 : 2002 + C2 : 2003 for Class 1 portable equipment, for
use in a Pollution Degree 2 environment. The instrument is designed to
be operated from an Installation Category 2 supply.
INTERNAL FREQUENCY STANDARD (OCXO)
Frequency
10 MHz
Temperature Stability
CALIBRATION INTERVAL
Better than 5 parts in 108, 0 to 55°C
2 years
Ageing Rate
ENVIRONMENTAL
Better than 1 part in 107, per year, after 1 month continous use
Rated Range of Use
Warm up
0 to 50°C and up to 95% relative humidity at 40°C
Less than 10 minutes to within 2 parts in 107 at 20°C
Storage and Transport
EXTERNAL FREQUENCY STANDARD INPUT
Temperature
Frequency
-30 to +70°C
1, 2, 5 and 10 MHz
Altitude
Input Level
Up to 2500 m (pressurized freight at 27 kPa differential)
Greater than 1 V peak to peak
DIMENSIONS AND WEIGHT
Input Impedance
Height
Nominally 1 kΩ
178 mm (7 in)
Width
GENERAL
380 mm (15 in)
Keyboard and Display
Depth
Logical color coded keyboard with color high resolution fast LCD
457 mm (18 in)
Display Size
(including handle, feet and covers)
160 x 85 mm
Weight
RS-232C
RS-232C interface is provided for printing and remote instrument control
Connector
INPUT CIRCUIT
POWER REQUIREMENTS
Impedance
AC Supply Voltage
100 - 240 V~ / 108 - 118 V~ (Limit 90 - 264 V~/98 - 132 V~)
50 - 60 Hz / 50 - 400 Hz (Limit 45 - 66 Hz / 45 - 440 Hz)
Maximum AC Power
190 VA
DC Supply Voltage
11 to 32 V
Maximum DC Power
100 W
CALIBRATION INTERVAL
2 years
OPTIONS AND ACCESSORIES
600 Ω MATCHING UNIT (OPTION 1)
9 way female ‘D’ Type
AC Supply Frequency
Less than 12 kg (standard version)
600 Ω
Return Loss
>21 dB at 1 kHz
Frequency Response
±0.5 dB at 200 Hz to 5 kHz, ±2 dB at 100 Hz to 20 kHz
Accuracy of 1:1 Input:Output Ratio
±1% at 1 kHz ± accuracy of 2945B or 2948B
Maximum Input
5 V RMS maximum at 200 Hz to 5 kHz
3 V RMS maximum at 100 Hz to 20 kHz
OUTPUT CIRCUIT
Impedance
ELECTROMAGNETIC COMPATIBILITY
600 Ω
Conforms with the protection requirements of Council Directive
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Return Loss
>21 dB at 1 kHz
Frequency Response
±0.5 dB at 200 Hz to 5 kHz
±2 dB at 100 Hz to 20 kHz
Level Accuracy
±2% at 1 kHz ± accuracy of 2945B or 2948B
Output Level
1 mV to 2.5 V RMS across 600 Ω
ANALOG SYSTEMS CARD (OPTION 2)
This option provides automatic testing for cellular,trunked and FM
radios and a BASIC Interpreter for customized tests.
PARALLEL INTERFACE (OPTION 4)
Allows direct connection of a parallel printer. Additionally provides 4
software programmable output lines.
Printer Port
Connector
25 way female D type
Printers Supported
75, 100, 150 dots per inch laser printers, FX 80, FX 100 Epson
format
Accessory Port
Connector
9 way female D type
Outputs
4 independently programmable output lines, each one configurable as
a logic line or as a relay contact closure. +5V supply available.
GPIB (OPTION 5)
Capability
For printing, remote instrument control or for programming of user
defined test sequences.
Complies with the following subsets defined by IEEE488:- SH1, AH1,
T6, L4, SR1, RL1, DT0, EI, DC1
MEMORY CARD DRIVE AND REAL TIME CLOCK (OPTION 6)
The memory card facility allows the storage of results, set-ups screen
dumps and user programs with SRAM cards. Meets PCMCIA 2 standard.
Allows the current date and time to be stored with results to the memory card and/or printed with a screen dump.
SSB DEMODULATOR (OPTION 8)
The SSB demodulator allows signals to be demodulated either via the
internal loudspeaker or via the accessory socket. Provides demodulation of SSB signals (upper and lower sideband)
Frequency Range
400 kHz to 1 GHz
AF Demodulation Range
10 Hz to 15 kHz
Distortion
Typically less than 3% at 1 kHz (300 to 3.4 kHz)
Detection Range
2 µV to 150 W
Features
Automatic detection of USB or LSB. BFO can be used for tuning of
carrier for AM and FM radio’s.
OCCUPIED BANDWIDTH MEASUREMENT (OPTION 9)
Calculates the bandwidth of a signal displayed on the spectrum analyzer.
Frequency Range
1 MHz to 1 GHz
Display Resolution
3 digits
Accuracy
20%
Bandwidth Measurement Range
3 kHz minimum
Ratio range 90% - 99% selectable in 0.1% steps
NMT CELLULAR SOFTWARE (OPTION 10)
NMT 450
Benelux
Austria
Malaysia
Saudi 1
Thailand
Tunisia
Poland
Czech
Slovenia
USER DEFINED NMT
NMT 900
NMTF
Spain
Indonesia
Saudi 2
Oman
Hungary
Russia
Bulgaria
Turkey
AMPS CELLULAR SOFTWARE (OPTION 11)
E-AMPS
N-AMPS USER DEFINED AMPS
TACS CELLULAR SOFTWARE (OPTION 12)
E-TACS
C-TACS II J-TACS
USER DEFINED TACS
TACS 2 C-TACS I
N-TACS
MPT 1327 TRUNKING SOFTWARE (OPTION 13)
BAND III
UK WATER
AUTONET
MADEIRA
NZ MPT1327
USER DEFINED MPT
JRC
HONG KONG
AMT
NL-TRAXIS
PH-INDO
PMRTEST SOFTWARE (OPTION 14)
USER DEFINED PMR for FM radio’s
EDACSTM RADIO TEST SOFTWARE (OPTION 15)
Provides Auto/Manual test capability for EDACSTM radios. Up to 4 User
defined variants can be created and stored, each with up to 24 spot
channel frequencies.
EDACSTM REPEATER TEST SOFTWARE (OPTION 16)
Provides Auto/Manual test capability for EDACSTM repeaters. Up to 4
user defined variants can be created and stored, each with up to 24
spot channel frequencies. A data logging facility is also available to
continuously decode and display data messages from the repeater
under test.
EDACS is an Ericsson GE registered trademark.
LTR TRUNKING TEST SOFTWARE (OPTION 18)
VERSIONS AND ACCESSORIES
Provides Auto/Manual test capability for LTR Trunked radios. (Planned
availability Q3 2006)
When ordering please quote the full ordering number information.
POCSAG DECODE (OPTION 22)
Allows off-air decoding of POCSAG messages. Can decode a message
as it is received, or decoding can be triggered from a user selectable
RIC code or fixed message pattern.
Bit Rate
Automatically decodes any standard bit rate up to 4800 bits/s.
Numeric or alphanumeric decoding is provided.
CCITT FILTER (OPTION 23)
Allows a CCITT filter to be inserted into either the demodulated audio
path or the audio input path
CMESS FILTER (OPTION 24)
Allows a CMESS filter to be inserted into either the demodulated audio
path or the audio input path
AVIONICS (OPTION 25)
Provides amplitude modulated signals for testing ILS, VOR, Marker
Beacons and SELCAL
(Full details of the Avionics features can be found in the Option 25
data sheet, Part number: 46891/213)
TONE REMOTE (OPTION 26)
Provides configuration screens and generation of Tone Remote control
signals
PLUS 2 DISTORTION NOTCH FILTERS BOARD (OPTION 29)
The standard instrument is supplied with a 1 kHz notch for Distortion
and Sinad measurements. This option allows the user to carry out
Distortion/Sinad measurements at two additional frequencies. The two
additional notch frequencies can be anywhere in the band 50 Hz to
20 kHz and must be stipulated at the time of ordering.
BAIL ARM/FRONT COVER (OPTION 30)
Provides a Bail arm carrying handle and front panel cover and storage
area. The Bail arm will also provide additional viewing angles when
mounted on a bench.
IF OUTPUT (OPTION 31)
Allows access to the IF signal from the rear of the instrument (Note:
Incorporation of this option replaces the standard demod out capability)
(1)
At low modulation levels the residual AM/FM may become significant.
Versions
2948B
Low-Noise Communications Service Monitor
Options
Number of received errors is displayed.
Notes
Ordering
Numbers
Option 1
600 Ω Matching Unit
Option 2
Analog Systems Card
Option 4
Parallel Interface†
Option 5
GPIB Interface†
Option 6
Memory Card Drive with real time clock
Option 8
SSB demodulator
Option 9
Occupied Bandwidth Measurement
-Note: Option 2 required when ordering any of the following options
10 to 18
Option 10
NMT Cellular
Option 11
AMPS Cellular
Option 12
TACS Cellular
Option 13
MPT 1327 trunking
Option 14
PMRTEST
Option 15
EDACSΤΜ Radio Test
Option 16
EDACSΤΜ Repeater Test
Option 18
LTR Trunking (Planned availability Q3 2006)
Option 22
POCSAG Decode
Option 23
CCITT Filter†
Option 24
CMESS Filter†
Option 25
Avionics
Option 26
Tone Remote
Option 29
Plus 2 Distortion Notch Filters board**
Option 30
Bail Arm and Front Panel Stowage
Option 31
IF Output Capability
Supplied Accessories
AC Supply lead
DC Supply lead
Operating Manual
Optional Accessories
For the very latest specifications visit
44991/145
Microphone with PTT
59000/189
Memory Card (128k)
59000/375
Memory Card (2 M)
www.aeroflex.com
46662/779
Soft carrying case (suitable for all 2948/2948B)
46662/571
Soft carrying/optional case
46662/616
Soft carrying/optional case for use with Option 30
54112/163
Hard Transit Case
54431/023
20 dB AF attenuator (BNC)
46884/728
Rack Mounting Kit
54421/001
BNC Telescopic Antenna
46884/650
Serial port to PC control cable (9 way)
46884/649
Serial port to PC control cable (25 way)
46884/648
RS-232 Printer cable (25 way)
59999/170
RF Directional Bridge
54421/002
RF Directional Power Head (1 to 50 MHz)
54421/003
RF Directional Power Head (25 to 1000 MHz)
46880/115
Service Manual
† Options 4 and 5 can not be fitted together.
† Options 23 and 24 can not be fitted together.
** Option 29, The standard instrument is supplied with a 1 kHz notch for
Distortion and Sinad measurements. This option allows the user to carry out
Distortion/Sinad measurements at two additional frequencies. The two additional
notch frequencies can be anywhere in the band 50 Hz to 20 kHz and must be
stipulated at the time of ordering.
CHINA Beijing
Tel: [+86] (10) 6539 1166
Fax: [+86] (10) 6539 1778
GERMANY
Tel: [+49] 8131 2926-0
Fax: [+49] 8131 2926-130
SCANDINAVIA
Tel: [+45] 9614 0045
Fax: [+45] 9614 0047
CHINA Shanghai
Tel: [+86] (21) 5109 5128
Fax: [+86] (21) 5150 6112
HONG KONG
Tel: [+852] 2832 7988
Fax: [+852] 2834 5364
SPAIN
Tel: [+34] (91) 640 11 34
Fax: [+34] (91) 640 06 40
FINLAND
Tel: [+358] (9) 2709 5541
Fax: [+358] (9) 804 2441
INDIA
Tel: [+91] 80 5115 4501
Fax: [+91] 80 5115 4502
UK Burnham
Tel: [+44] (0) 1628 604455
Fax: [+44] (0) 1628 662017
FRANCE
Tel: [+33] 1 60 79 96 00
Fax: [+33] 1 60 77 69 22
KOREA
Tel: [+82] (2) 3424 2719
Fax: [+82] (2) 3424 8620
UK Cambridge
Tel: [+44] (0) 1763 262277
Fax: [+44] (0) 1763 285353
As we are always seeking to improve our products,
the information in this document gives only a general
indication of the product capacity, performance and
suitability, none of which shall form part of any contract. We reserve the right to make design changes
without notice. All trademarks are acknowledged.
Parent company Aeroflex, Inc. ©Aeroflex 2006.
UK Stevenage
Tel: [+44] (0) 1438 742200
Fax: [+44] (0) 1438 727601
Freephone: 0800 282388
USA
Tel: [+1] (316) 522 4981
Fax: [+1] (316) 522 1360
Toll Free: 800 835 2352
w w w.aeroflex.com
info-test@aeroflex.com
Our passion for performance is defined by three
attributes represented by these three icons:
solution-minded, performance-driven and customer-focused.
Part No. 46891/212, Issue 3, 01/06
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