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

Model RDM026/RDM206 RF Tunable Receiver/Demodulator/Bit Synchronizer (VME/PCI Module)
Model RDM026

The RDM026 (VME) / RDM206 (PCI) Single Channel Digital RF Receiver is an integrated solution consisting of an RF Signal Processor, 2 Demodulators, 2 Bit Synchronizers and 2 Frame Synchronizers (Pattern Detectors) 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 processes 3 RF Bands: S Band, 2185 MHz to 2485 MHz; Upper L Band, 1700 MHz to 1850 MHz; and Lower L Band 1427 MHz to 1545 MHz (other frequencies available). Depending upon specific user requirements, a choice of 4 IF filters are available.

The demodulation process, as well as the 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.

Data is output via Byte aligned Ethernet (optional), TTL or RS422 ports.

  1. Form Factor
  2.      • 6U VME Single Slot or
         • PCI Single Slot
         • 2U Rack-Mountable Chassis
  3. Diversity combiner*: Pre-D & Post D*
  4. Noise Figure
  5.      • < 10 dB
  6. Wide Dynamic Range
  7.      • > 80 dB
  8. RF Frequencies
  9.      • 2185 MHz to 2485 MHz
         • 1700 MHz to 1850 MHz
         • 1427 MHz to 1545 MHz
         • 180 MHz to 1100 MHz*
         • 4400 MHz to 5500 MHz*
         • Other Frequencies Available
  10. 4 Selectable IF Bandwidths
  11. Multi-Waveform Demodulation
  12.      • BPSK, QPSK, OQPSK
         • UQPSK*, AQPSK*
         • SOQPSK
         • Analog FM & PCM/FM*
         • GMSK *
         • ARTM Tier 0, 1, 2
  13. Demodulators
  14.      • PCM / PSK*
         • 1 RF, 2 SCs* (per channel)
  15. 2 Bit Synchronizers (per channel)
  16.      • 50 bps to 10 Mbps BPSK (20 Mbps*)
         • 50 Bps to 20 Mbps QPSK (40 Mbps*)
         • 100 Bps to 20 Mbps QPSK (40 Mbps*)
         • 2 Viterbi Decoders *
          • 2 R=1/2, 1/3, 2/3, 3/4, 5/6, 7/8
         • Reed-Solomon *
         • HDLC/AX.25 (e.g. CUBSAT)
  17. 3 Frame Sync's per channel * (Pattern Detectors)
  18. Byte Aligned Ethernet Data Output
  19. Best Source Selector Compatible Output
  20. Tracking Anternna Control Support
  21.      • Envelope/Coherent AM*
         • SNR*
  22. IRIG-B*
  23.      • Input, Output
  24. Remote Control
  25.      • VME/PCI Bus *
         • RS232 or RS485 *
         • Ethernet *

* OPTIONAL
Input:
RF Frequency:
2185 MHz to 2485 MHz, 1700 MHz to 1850 MHz, and 1427 MHz to 1545 MHz
Noise Figure:
< 10 dB
IF Filters:
4 selectable filter bandwidths
Dynamic Range:
> 80 dB
Input Impedance:
50 Ohms
VSWR:
< 2:1

Demodulation:
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*
Locking Threshold:
6 dB Eb/No

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

Bit Synchronizer(s): (Option)
Bit Rate:
50 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 Output
TTL, RS422 (Standard)
Frame Sync’ed Byte Aligned Ethernet Data Output*

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 Output:
Signal Present, Carrier Lock, Bit Synchronization Lock, Viterbi Lock, Frame Lock, Doppler

*OPTIONAL