Space Ground Link Subsystem TT&C Transponder

TOR Compliant, S-Band TT&C Transponder

The Space Ground Link Subsystem (SGLS) TT&C Transponder is a space-qualified, TOR-compliant, S-band transponder that provides compatibility with the Air Force Satellite Control Network (AFSCN) SGLS telemetry and command formats in a single, highly reliable unit. This transponder has been designed for the demands of space including missions in low Earth orbit (LEO), medium Earth orbit (MEO) and geosynchronous Earth orbit (GEO).

  • Fully Aerospace TOR compliant (parts, materials, and processes)
  • Radiation Hardened for the harsh Medium Earth Orbit (MEO) and for use in Strategic nuclear environment
  • Operating modes commanded via latching relays for reliable operation

Product Details

Further customization is available, please contact us to discuss your unique requirements.

Features

The Space Ground Link Subsystem (SGLS) TT&C Transponder operates at uplink command rates of 1 kbps and 2 kbps (automatically detected) and provides downlink telemetry data rates up to 32 kbps on a 1.7 MHz subcarrier. Coherent operation, including ranging, is selectable via command, as is rate 1/2, constraint length 7 convolutional encoding. For signal security the unit provides interfaces to the KG-327 cryptographic unit for uplink decryption and downlink encryption. Being fully compliant to Aerospace Parts, Materials and Processes TOR requirements* results in lower life-cycle costs by reducing the probability of parts issues impacting spacecraft integration and test efforts.

Receiver Features

  • Operating mode: SGLS/ AFSCN including Ternary FSK
  • Noise figure:< 4.0 dB
  • Operating Frequency: 1760 to 1840 MHz
  • Acquisition: Auto acquisition (± 100 kHz)

Transmitter Features

  • 7W TX power
  • Operating Frequency: 2200 to 2300 MHz
  • Data Rates: up to 32 kbps on 1.7 MHz subcarrier
  • Meets NTIA mask
  • Can be configured as a non-coherent transceiver or coherent transponder
  • R 1/2, K=7 convolutional encoder
  • Coherent ranging
  • Automatic Transmitter Turn On capability with uplink signal

Specifications

 

Space Ground Link Subsystem (SGLS) TT&C Transponder Data Sheet

 

 

View Document

 

Interface 1553B SV interface
RF connectors are SMA-F
Non-RF connectors are sub-miniature D
Digital interfaces are differential RS-422 compatible line drivers and receivers
Operating modes commanded via latching relays
DC power
68-71 VDC: < 15 Watts receive-only mode, < 45 Watts full duplex
Analog telemetry: Voltage Monitor, Receiver AGC, RX frequency offset,
Temperature Monitors (passive thermistors), RF Output Power Monitor
Hard-line baseband command interface for spacecraft checkout
Interface to standard cryptographic equipment (e.g, KG327)
Size 8.7” x 7.6” x 6.9” (Including mounting feet, connectors and semi-rigid cables)
Weight 17.5 lbs.
EMI/ EMC MIL-STD-461C
Radiation Radiation hardened for natural and man made environments

 

  • 100 kRad
  • EMP Tolerant
  • Prompt Dose

 

Vibration 17.2 Grms (Qualification level)
Shock 1123 G Peak, 1723 Hz
Temperature -34° C to +71° C