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

Model 4426 Digital RF Receiver Single/Dual/Quad Channel4426

The 3rd Generation GDP Model 4426 Digital RF Receiver is available in single, dual or quad channel configurations in a 2U rack-mounted chassis. Our Ultrtech Diversity Combiner may be included with dual or quad channel configurations. Each channel is completely independent and includes an integrated solution consisting of an RF Signal Processor, Demodulators, optional Bit Synchronizers and Frame Synchronizers. Diversity Combiner (Pre-D and Post-D) is optional. This state-of-the art receiver provides a compact, cost competitive, flexible solution to a wide variety of communications link scenarios.

The Model 4426 processes 3 RF Bands: S Band, 2185 MHz to 2485 MHz; Upper L Band, 1700 MHz to 1850 MHz; Lower L Band 1427 MHz to 1545 MHz. Additional RF bands are available (i.e. P Band 100 MHz to 1100 MHz, C-Band …). Multi-Band options are also 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. 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.
typical-channel-chart
A variety of optional FEC decoders are available and two fully programmable frame synchronizers (pattern detection) are provided with the bit synchronizer option.

With the Bit Synchronizer option, data is output via TTL and RS- 422 outputs.

The unit supports an optional Ethernet output interface by which frame synchronized byte aligned data can be transported. UDP/IP transport is provided for raw data. 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. Up to 4 Channels per 2U Box
  2. Diversity Combiner*: Pre-D* & Post-D*
  3. Form Factor
  4.      • 2U Rack-Mountable Chassis
  5. Noise Figure
  6.      • < 10 dB (Low Noise Option Available)
  7. Wide Dynamic Range
  8.      • > 80 dB
  9. RF Frequencies
  10.      • 2185 MHz to 2485 MHz
         • 1700 MHz to 1850 MHz
         • 1427 MHz to 1545 MHz
         • 100 MHz to 1100 MHz *
         • 4400 MHz to 5500 MHz *
         • Other Frequencies Available
  11. Multi-Waveform Demodulation
  12.      • BPSK, QPSK, OQPSK
         • UQPSK *, AQPSK *
         • SOQPSK (ARTM Tier 1) *
         • Analog FM & PCM/FM *
         • GMSK*
         • PCM/FM (ARTM Tier 0)*
         • CPM (ARTM Tier 2)*
  13. 3 Demodulators (Per Channel)
  14.      • PCM / PSK*
         • 1 RF, 2 SC * (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 *)
         • 2 Viterbi Decoders *
       • R=1/2, 1/3*, 2/3*, 3/4*, 5/6*, 7/8*
         • Reed-Solomon *
         • LDPC*
  17. 3 Frame Synchronizers per Channel*
  18. Byte Aligned Ethernet Data Output*
  19. Best Source Selector Compatible Output*
  20. DQE/DQM Output Modes for BSS*
  21. 70 MHz, IF Inputs & Outputs
  22. tape (IRIG 106) Inputs & Outputs
  23. Tracking Antenna Control Support*
  24.      • Envelope / Coherent AM*
         • SNR*
  25. IRIG-B*
  26.      • Input, Output
  27. Space Time Code (STC)*
  28. Adaptive Equalization*
  29. SLE (Support for Space Applications)*
  30. CCSDS (Support for Space Applications)*
  31. IRIG Chapter 10 Compatible Output
  32. IRIG Chapter 7 Compatible Output*
  33. Remote Control
  34.      • Ethernet & RS-232 (Std)

* 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 (Low Noise Option Available*)
IF Filters:
Selectable filter bandwidths (Standard set provided)
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 3.0 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:
10 bps 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, RNRZ (Other codes available as needed)*
Output Codes:
NRZ-L/M/S; BIΦ-L,M,S, RNRZ (Other codes available as needed)*
Decoders*
Viterbi Rate 1/2*, 1/3*, 2/3*, 3/4*, 5/6*, 7/8*; Reed Solomon*, LDPC*
Descrambler:
V.35 / V.36 (CCITT/ Intelsat)

Data Output
Analog
TTL, RS422 (Standard)
Ethernet Data Output (IRIG-106 Ch-10, HDLC/AX.25)*
Encapsulated Data & Quality that supports GDP Best Source Selector *

Control Interface:
Ethernet & RS-232 (Standard)
IEEE 488 *

Environment:
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