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RF Receiver Signal Analyzer Model 2551 by ves88494


                                             Obsolete Product - for Reference Only

             RF Receiver & Signal Analyzer
                      Model 2551

n 10kHz to 30MHz Tuning Range with                                n ISB, LSB, USB, CW, AM, FM and FSK
  1Hz Tuning Resolution                                             Detection Modes

n Low LO Phase Noise                                              n Phase-locked Local Oscillators for
                                                                    Multiple Channel Applications
n Quadrature Digital IF Output (I&Q)
                                                                  n 51 Standard Bandwidths

The 2551 Receiver is a high performance      spurious or harmonic content, the Model      be built onto an embedded computer.
VXIbus 10kHz to 30MHz DSP Receiver.          2551 may be used as a signal level           The gathered data can be sent over
Systems using instrumentation can now        analyzer. The cost savings over a            radio or land line to a central location.
include the latest in receiver technology.   spectrum analyzer are significant.
All of your LF/HF communication as well                                                   Diverse Applications
as Test & Measurement requirements are       Automated RF Monitoring                      Radio frequency occupancy monitoring,
accomplished utilizing Digital Signal        Applications that require frequency          surveillance, propagation studies,
Processing (DSP) design for superior         occupancy or remote monitoring can           direction finding and RF interference
performance, higher reliability and lower    now utilize up to 12 Model 2551’s in a       locating are some applications which are
cost.                                        single mainframe. This “system” may be       typical for this diverse receiver.
                                             powered from a 24VDC supply and
Signal Analyzer                              located in the back of a vehicle or
In production ATE systems, where known       unmanned location. A program to control
frequencies need to be checked for           and gather data from the receivers can

                                    For your local Racal Instruments Sales Office see page 173.                                   -95-
                                   Obsolete Product - for Reference Only

This DSP receiver offers significant          Sweep through up to 125 user-selectable
improvements over analog receivers.           bands with dwell and bridge times of up
These improvements include increased          to 9 seconds. Step size may be specified
stability and precisely controlled filter     in sweep mode.
characteristics which translates into
greater reliability and performance.          Complex DSP Functions in Flash Memory
                                              Harness the power of DSP technology by
Flexible Scan and Sweep Modes                 loading the 2551’s on-board flash with
Scan up to 250 pre-selected channels at       user-specified demodulation schemes,
a preset scan rate (up to 100 ch/s) and       filtering or complex functions. Flash
squelch level (ranging from 6 to 30dB).       memory may be re-programmed any                        Receiver Control Panel from
Channels may be scanned with dwell            time over the VXIbus transforming the                 VXIplug&play Soft Front Panel
and bridge times of up to 9s. Each            2551 into a custom receiver for special
channel may be individually excluded          applications. If special access modes are
from sweep by setting skip flags to skip      required for custom DSP commands, the
up to 100 channels.                           receiver’s command set itself may be
                                              modified in a separate on-board flash

           2551 LF/HF DSP Receiver Simplified Block Diagram

This LF through HF receiver is a triple-conversion superheterodyne design in which the final IF filtering and demodulation are
accomplished with Digital Signal Processing (DSP) for superior accuracy and flexibility. The three Intermediate Frequencies (IFs)
are 40.456MHz, 456kHz, and 24kHz. Having the first IF above the entire tuning range assures spurious-free reception. At the third
IF the signal is converted to digital form. A DSP chip then provides fine tuning, IF filtering to the selected bandwidth and AM, FM
or product detection according to the operating mode. Fifty-one bandwidths are offered from 100Hz to 16kHz. The demodulated
signals are converted back to analog form for output to a speaker, stereo headphones or balanced lines.

-96-                                  For your local Racal Instruments Sales Office see page 173.
                                         Obsolete Product - for Reference Only
                                              2551 Specifications
FREQUENCY                                           SCAN MODE                                     Decay Time Range (nominal for 50dB change)
Tuning Range                                        Channel Presets                                    0ms to 4s (programmable)
    10kHz to 30MHz (0-10kHz with                        250                                       Dynamic Range
    reduced performance)                            Channel Parameters Stored                          Output level held within ±1dB over a
Tuning Step Size Resolution                             Frequency Detection Mode         BW            110dB range.
    1Hz to 10MHz                                        De-emphasis Squelch Value        BFO      Threshold
Synthesizer Tuning Speed (maximum)                      Step Size   Dwell Time           AGC           Set to -112 dBm
    ∆f<100kHz: <1ms                                     AGC Decay Bridge Time            MGC      Dump Time
    ∆f<1MHz: <1.5ms                                     Skip Flag   IF Shift                           <2ms
    ∆f<10MHz: <2ms                                  Scan Range                                    AM Attack and Decay Time (50dB change)
Receiver Tuning Time                                    1 to 250 channels                              50ms (nominal)
    <10ms                                           Scan Rate
Tuning Accuracy                                         1 to 100 channels/s                       MANUAL GAIN CONTROL (MGC)
    External Frequency Standard                                                                   Dynamic Range
    (10MHz): Tuned frequency equal to               SWEEP MODE                                         127dB
    accuracy of external standard in                Sweep Types                                   Resolution
    ppm.                                                Single-band: Sweep between 2                   1dB
                                                        consecutive channels
DETECTION MODES                                         Multi-band: 2 to 125 sweep bands          IF SECTION
AM, FM                                              Sweep Rate                                    First IF
    All bandwidths                                      1 to 100 channels/s                            40.456MHz
USB LSB, CW                                                                                       Second IF
    Bandwidths ≤6kHz                                RF SECTION                                         456kHz
ISB                                                 Input Impedance                               Third IF
    2.8kHz bandwidth per sideband                       50Ω                                            24kHz
                                                    Input VSWR                                    Fourth IF (DSP)
SIGNAL LEVEL ANALYSIS                                   < 1.5:1 (typical)                              51 Standard Bandwidths from 100Hz
Signal Level Range                                      <2.5:1 (maximum at tuned frequency)            to 16kHz
    -110dBm to 0 dBm                                Sensitivity of 10dB SINAD (above 1.6MHz)      Shape Factor (3dB to 60dB)
Signal Level Resolution                                 AM (6kHz BW): -105dBm, 50%                     Better than 2:1, 400Hz and above
    1dB                                                 modulation                                Inband Ripple (max)
                                                        CW (500Hz BW): -122dBm                         1dB
SQUELCH CONTROL                                         SSB (3kHz BW): -113dBm
(Carrier-to-noise ratio for SCAN and SWEEP modes)       FM (5kHz deviation, 400Hz modula-         INTERFERENCE IMMUNITY
Programmable Range                                      tion, 16kHz BW):
                                                                                                  IF Rejection
    113dB                                               -98dBm for 20dB SINAD
Resolution                                          Noise Figure (above 1.6MHz)
                                                                                                  Image Rejection
    1dB                                                 15dB (max)
                                                                                                  Cross Modulation
DWELL & BRIDGE                                      RF PROTECTION                                      Unmodulated desired signal of
                                                        50dB reflective attenuation. Activates
CONTROL                                                 at signal levels between +10dBm
                                                                                                        -60dBm together with a modulated
(For SCAN and SWEEP modes)                                                                             (30% AM at 1kHz) undesired signal
                                                        and +20dBm. Protects from input                of -10dBm, spaced 100kHz apart, will
Dwell Time                                              signals up to 10 Watts. Automatic
    Time to “dwell” on a scanned                                                                       produce less than 10% cross
                                                        reset.                                         modulation of the desired signal.
    channel or swept frequency with a
    signal strength exceeding the                                                                 Blocking
    squelch threshold.                              PRESELECTOR                                        Attenuation of a desired RF signal of
Dwell Time Range                                        Eight one-half octave bandpass                 -60dBm by an unmodulated signal of
    0 to 9s                                             preselector filters used from 1.6 to           +10 dBm spaced 100kHz away is
Bridge Time                                             30MHz. Two lowpass filters for                 less than 3dB.
                                                        frequencies <1.6MHz. Filter selection     Synthesizer Phase Noise
    If a scanned channel or swept
                                                        is automatic with tuned frequency         (@1kHz spacing, nominal)
    frequency’s signal strength drops
                                                        selection.                                     -110 dBc/Hz
    below the squelch threshold during
    dwell, this is the amount of time the                                                         Oscillator Re-radiation (1GHz)
    receiver waits for the signal to return         AUTOMATIC GAIN                                     -110dBm
    before it leaves the channel.                   CONTROL (AGC)                                 Spurious Responses
                                                                                                  (equivalent or less for -50dBm input signals)
Bridge Time Range                                   SSB & CW Attack Time                                ≤ -120dBm
    0 to 9s                                             Fast: <2ms for 50dB change (sweep         Generated Spurs (above 1.6MHz)
                                                        and scan only)                                 No more than 5: <-110dBm
                                                        Nominal: <10ms for 50dB change                 All other spurs: <-120dBm

                                            For your local Racal Instruments Sales Office see page 173.                                           -97-
                                            2551 Specifications Continued
INTERMODULATION                                             VXIbus INTERFACE DATA                                ENVIRONMENTAL DATA
                                                            (Single-slot, message-based, VXIbus 1.4 compliant)   Temperature Range
DISTORTION                                                  Drivers                                                  Operating: 0 oC to 50oC
Second Order Intercept                                          LabVIEW, LabWindows/CVI,                             Storage: -40oC to +71oC
       100kHz -1.6MHz: +45dBm                                   VXIplug&play (WIN, WIN95, WIN NT                 Humidity
       1.6MHz - 30MHz: +60dBm                                   Frameworks)                                          10% to 90% non-condensing
Third Order Intercept (typical)                             Status Lights                                        EMI
       +30dBm                                                   Red: Self-test failure                               Equipment designed to intent of the
Inband                                                      Weight                                                   applicable requirements of MIL-STD
       -50dBc (2 equal tones separated by                       5 lbs. (2.3kg)                                       461/462 as a guide.
       >1kHz, input level up to -20dBm)                     Peak Current & Power                                 EMC (Council Directive 89/336/EEC)
                                                            Consumption                                              CISPR 11 (Class A), IEC801-2,3,4
FRONT PANEL INPUTS                                                     +12        +5      -5.2     -12           Safety (Low Voltage Directive 73/23/EEC)
Antenna                                                         I Pm   1.1A       1.2A    .06A     0.5A              EN61010-1, IEC1010-1, UL31111-1,
       SMA (50Ω)                                                                  Total Power: <26 Watts             CSA22.2#1010
1st, 2nd, 3rd LO (jack)                                                                                          MTBF (MIL-HDBK-217F, Naval Sheltered)
       Coaxial D-sub                                                                                                 11,000 hours
External Reference
       SMB male: 10MHz, 0dBm                                                                                            The CE Mark indicates that the
                                                                                                                        product has completed and
FRONT PANEL OUTPUTS                                                                                              passed rigorous testing in the area of RF
Wideband IF (30dB gain@<-60dBm inputl)                                                                           Emissions, Immunity to Electromagnetic
                                                                                                                 Disturbances and complies with Euro-
       SMA female (fc =456kHz, BW=30kHz)
                                                                                                                 pean electrical safety standards.
Narrowband IF (-10dB signal level)
       SMA female, (fc =455kHz)
1st, 2nd, & 3rd LO (plug)
       Coaxial D-sub
Stereo Headphone Jack
(0 to 5Vpk-pk signal level)
       1/8" connector: 8Ω
DSP Signals           (12-pin, female circular connector)
       Line audio: 600Ω balanced (0dBm
       Alternate Line Audio: 600Ω balanced
       (2nd ISB signal)
       Wideband Video: 3V pk-pk ,75Ω
       Digital I&Q: TTL

                                             Obsolete Product - for Reference Only

                                                            ORDERING INFORMATION
        Model                                                          Description                                                      Part Number

         2551                                                     LF/HF DSP Receiver                                                      RVXI-3250

-98-                                              For your local Racal Instruments Sales Office see page 173.

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