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

Model RDM023/RDM203 IF Tunable Receiver/Demodulator/Bit Synchronizer (VME/PCI Module)
Model RDM023

The RDM023 (VME) / RDM203 (PCI) Digital IF Receiver is an integrated solution consisting of an IF Signal Processor, 3 Demodulators, 2 Bit Synchronizers and 2 Frame Synchronizers contained on a single slot 6U VME/PCI card. Available in both VME and PCI form factors, this state-of-the art module provides a compact, cost competitive, flexible solution to a wide variety of communications link scenarios.

The RDM selects 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 4 input 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.

In addition to the Analog outputs, data is output via Byte aligned Ethernet and TTL or RS422 data ports.

  1. Form Factor
  2.      • 6U VME Single Slot or
         • PCI Single Slot
  3. 2 Input Ports
  4. Tunable Center Frequency Bands
  5.      • 1 kHz to 180 MHz or
         • Other IF Ranges available
  6. Wide Dynamic Range
  7.      • > 80 dB
  8. 4 Selectable Input Bandwidths
  9. Programmable Acquisition & Tracking Range
  10. Multi-Waveform Demodulation
  11.      • Analog / Digital PM *
         • BPSK
         • QPSK
         • OQPSK
         • UQPSK *
         • AQPSK *
         • SOQPSK (ARTM Tier 1) *
         • Analog FM & PCM/PM *
         • GMSK *
  12. 3 Demodulators
  13.      • PM / PSK *
         • 1 IF, 2 SCs *
  14. 2 Bit Synchronizers
  15.      • 50 bps to 10Mbps BPSK (20 Mbps *)
         • 100 Bps to 20 Mbps QPSK (40 Mbps *)
         • Viterbi Decoders *
         • Reed-Solomon *
  16. 2 Frame Syncs
  17. Byte Aligned Ethernet Data Output*
  18. Control
  19.      • Ethernet (Standard)
         • VME/PCI Bus*
         • RS232 or RS485

* OPTIONAL
Input:
Input Ports:
2
Center Frequency:
1 kHz to 180 MHz or 200 MHz to 450 MHz or 550 MHz to 1100 MHz
Input Filters:
4 selectable filter bandwidths
Dynamic Range:
> 90 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*
Modulation:
Waveforms BPSK, QPSK, OQPSK, UQPSK, AQPSK*, GMSK*, SOQOSK ARTM Tier 1*
Locking Threshold:
6 dB Eb/No

PCM/FM Demodulator*:
Data Rate:
1 kHz to 20 Mbps (30 Mbps*)

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

Data Outputs:
TTL, RS422 (Standard)
Frame Sync Byte Aligned Ethernet Data Output *
2 Analog Outputs

Control Interface:
Ethernet (Standard)
RS-232 *
PCI/VME Bus *

Environment:
Card Size:
PCI/VME, Single Slot
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