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

The Model 4460 Single Channel Digital Receiver is housed in a 10.75 x 12 x 1.75 inches high chassis. This lightweight portable unit is powered by a standard laptop power supply. It may also be run from a standard laptop external battery unit. This unit 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. This state-of-the art module provides a compact, cost competitive, flexible solution to a wide variety of communications link scenarios.

The Model 4460 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. The unit supports an optional Ethernet output mode by which frame synchronized byte aligned data can be transported. UDP/IP transport is provided for raw data and, optionally HDLC/AX.25mdata. IRIG-106 Chapter 10 compatible output is also available.
An Encapsulated data and data-quality output may be included that supports the GDP Best Source Selector products.

  1. Form Factor
  2.      • 10.75 x 12 x 1.75 inch chassis
  3. Noise Figure
  4.      • < 10 dB (Low Noise Option Available)
  5. Wide Dynamic Range
  6.      • > 80 dB
  7. RF Frequencies
  8.      • 2185 MHz to 2485 MHz
         • 1700 MHz to 1850 MHz
         • 1427 MHz to 1545 MHz
         • 550 MHz to 1100 MHz *
  9. 4 Selectable IF Bandwidths
  10. Multi-Waveform Demodulation
  11.      • BPSK, QPSK, OQPSK
         • UQPSK *, AQPSK *
         • SOQPSK (ARTM Tier 1) *
         • Analog FM & PCM/FM *
         • GMSK*
         • PCM/FM (ARTM Tier 0)*
         • CPM (ARTM Tier 2)*
  12. 3 Demodulators (Per Channel)
  13.      • PCM / PSK*
         • 1 RF, 2 SC * (Per Channel)
  14. 2 Bit Synchronizers (Per Channel)*
  15.      • 50 bps to 10 Mbps BPSK (20 Mbps *)
         • 100 bps to 20 Mbps QPSK (40 Mbps *)
         • Viterbi Decoders *
         • Reed-Solomon *
  16. 2 Frame Synchronizers per Channel (Pattern Detectors)
  17. Byte Aligned Ethernet Data Output*
  18. Remote Control
  19.      • VME/PCI Bus*
         • RS232 or RS485*
         • Ethernet

    * OPTIONAL Features
Input:
RF Frequency:
2185 MHz to 2485 MHz, 1700 MHz to 1850 MHz, & 1427 MHz to 1545 MHz or 100 MHz to 1100 MHz*; 4400 MHz to 5250 MHz* (Other Frequencies Available)
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*
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; BIF-L, M, S
Output Codes:
NRZ-L
Viterbi Decoder*
Rate 1/2, 1/3, 3/4,7/8 ... options
Descrambler:
V.35 / V.36 (CCITT/ Intelsat)

Data Output
TTL, RS422 (Standard)
Frame Sync'd 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