Receivers/Demodulators & Downlink: RF, IF & Sub-Carrier

Model 4423 IF Single/Dual/Quad Channel Tunable Receiver/Demodulator/Bit Synchronizer (2U Chassis)
Model 4423

The Model 4423 Digital IF Receiver is an integrated solution consisting of an IF Signal Processor, 3 Demodulators, 2 Bit Synchronizers and 2 Frame Synchronizers contained in a single 2U rack mountable chassis. This state-of-the art receiver provides a compact, cost competitive, flexible solution to a wide variety of communications link scenarios.

The Model 4423 is user programmed to select one of two inputs for processing. The input frequencies within the factory-configured Tunable Center Frequency Band are demodulated. Depending upon specific user requirements, a choice of up to 4 input band-pass filters are available.

The demodulation process as well as baseband bit synchronization process is totally performed in the digital domain. Signal acquisition is performed by scanning the IF within the programmed acquisition band centered about the selected Carrier frequency. PM / PSK waveforms are additionally scanned for acquisition at the subcarrier frequencies. Once signal acquisition is complete, synchronized signal tracking is performed whereby continuous validation of the lock state is maintained.

A variety of FEC decoders are available and two fully programmable frame synchronizers are included for pattern detection.

In addition to the Analog output, data may be output via Ethernet (option), TTL, RS-422 data ports.

An Encapsulated data and data quality output may be included that supports the GDP Best Source Selector products.

  1. Up to 4 Independent Channels per 2U Box
  2. Form Factor
  3.      • 2U Rack Mount Chassis
  4. 2 Input Ports (Per Channel)
  5. Tunable Center Frequency Bands
  6.      • 1 kHz to 180 MHz
  7. Wide Dynamic Range
  8.      • > 80 dB
  9. Programmable Acquisition & Tracking Range
  10. Multi-Waveform Demodulation
  11.      • BPSK, QPSK, OQPSK
         • UQPSK *, AQPSK *
         • SOQPSK (ARTM Tier 1) *
         • Analog FM & PCM/FM *
         • GMSK*
         • Multi-Symbol PCM/FM *
  12. 3 Demodulators (Per Channel)
  13.      • PCM / PSK *
         • 1 IF, 2 SC * (Per Channel)
  14. 2 Bit Synchronizers (Per Channel) *
  15.      • 50 bps to 10 Mbps BPSK (20 Mbps *)
         • 50 bps to 20 Mbps QPSK (40 Mbps *)
         • 2 Viterbi Decoders *
             • R=1/2, 1/3, 2/3, 3/4/ 5/6, 7/8
         • Reed-Solomon *
         • HDLC / AX.25 (e.g. CUBESAT) *
  16. 3 Frame Synchronizers per Channel
  17. Byte Aligned Ethernet Data Output *
  18. Best Source Selector Compatible Output *
  19. Tracking Antenna Control Support *
  20.      • Envelope / Coherent AM *
         • SNR*
  21. IRIG-B *
  22.      • Input, Output
  23. Chapter 10 Compatible Output *
  24. Remote Control
  25.      • Ethernet & RS-232(STD)
         • IEEE 488 *

    *OPTIONAL

INPUT:
Input:
Ports 2
Center Frequency:
1 kHz to 180 MHz or 550 MHz to 1100 MHz
Input Filters:
4 selectable filter bandwidths
Dynamic Range:
> 80 dB
Input Impedance:
50 Ohms
VSWR:
< 1.5:1

Demodulator(s):
IF Acquisition / Tracking Range:
255 kHz
Loop Bandwidth:
0.01% to 1% of Bit Rate (Analog PM 2 Hz to 20 KHz)

PM Demodulator:
Frequency Response:
100 Hz to 15 MHz
Modulation Index:
0 to 2.8 Radians

PSK Demodulators:
Types:
1 IF, 2 SC (optional)
Modulation Waveforms:
BPSK, QPSK, OQPSK, UQPSK *, AQPSK *, GMSK *,SOQOSK ARTM Tier 1 (Optional)
Locking Threshold:
6 dB Eb/No

PCM/FM Demodulator
Data Rate
50 bps to 20 Mbps (30 Mbps Optional)

Bit Synchronizer(s): (Option)
Bit Rate:
50 bps to 10 Mbps BPSK (20 Mbps Optional) 100 bps to 30 Mbps QPSK (40 Mbps Optional)
Input Codes:
NRZ-L,M,S; BI-L,M,S
Output Codes:
NRZ-L
Viterbi Decoder (Optional):
Rate 1/2, 1/3, 3/4, 7/8, ...options
Descrambler:
V.35 / V.36 (CCITT/ Intelsat)

Frame Pattern Detector: (Option)
64-bit FSP w/ full Mask and Strategy

Data Outputs:
Analog
TTL, RS422 (Standard) I, Q, COMBINED
Ethernet Data Output (Optional)
Encapsulated Data & Quality Output that supports GDP Best Source Selector (Optional)

Control Interface:
RS-232 & Ethernet (Standard)
Ethernet (Optional)

Environment:
Temperature:
10°C to 50°C Operational;
-40°C to 85°C Storage

Status Outputs:
Signal Present, Carrier Lock, Bit Synchronization Lock, Viterbi Lock, Frame Lock, Doppler

*OPTIONAL