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S-band Transceiver

Price on request

• Operates in the 2200-2290 MHz and 2025-2110 MHz EESS/SRS/SOS allocation
• Full duplex operation
• CCSDS compliant channel downlink coding ensures compatibility with many off-the-shelf demodulators as well as
various ground station networks
• AX.25 / HDLC uplink implementation allows robust yet low-complexity telecommand link implementation
• Strong Forward Error Correction (FEC) to maximize link throughput
• No need for data pre-processing: all channel coding is performed inside the transceiver
• In-flight configurable downlink RF parameters (Frequency, data-rate, RF power, FEC parameters)
• Safety watchdog
• Transmit power control loop to keep RF output power constant over varying operating conditions
• IPC-A-610 Class 3 assembly

  • Description
  • Product properties
  • Performance
  • Configuration
  • Qualification and acceptance testing

The ISISPACE CubeSat compatible S-band Transceiver is comprised of two PCBs, designed to meet the needs of telemetry downlinks, high data-rate downlinks of up to 4.3 Mbps (usable information bit-rate at CCSDS transfer frame level) and telecommand uplinks of 9.6 kbps (AX.25). The S-band transmitter is flexible, implementing CCSDS as data link layer protocol and allowing in-flight configuration of data-rate, modulation scheme, frequency, and RF output power. The system is designed for full-duplex TT&C and Payload data downlink, a diplexer is used such that a single antenna can be used for uplink and downlink.

Dimensions: 99 x 94 x 15 mm (transmitter PCB)
96 x 92 x 10 mm (receiver PCB)
Mass: 132g (transmitter) + 85g (receiver)
Supply voltage range: 7 to 20 V
Power consumption: Transmit mode: 13 W (for 33 dBm RF output power)
Receive-only mode: 1.2 W
Operating temperature: -40 to +70 °C
RF interfaces: SMPM connector, 50 Ohms
Payload downlink data interfaces: LVDS
Housekeeping data & uplink telecommand interface I²C

Transmitter

Frequency range: 2200 – 2290 MHz
RF output power: 27 to 33 dBm (settable) ± 1 dB typ.
Transmitted data rate (on-air): up to 10 Mbit/s (5 Msym/s, OQPSK)
Modulation scheme: Suppressed carrier: BPSK, OQPSK selectable as per CCSDS 401.0-B
Forward Error Correction: Convolutional (K=7, ½) as per CCSDS 131.0-B
Reed Solomon (223, 255) as per CCSDS 131.0-B
Pseudorandomization: Pseudorandomization as per CCSDS 131.0-B
Synchronization: 32 bit Attached Sync Marker as per CCSDS 131.0-B

 

Receiver

Frequency range: 2025 – 2110 MHz
Noise figure: < 4 dB (measured at diplexer RF input / output port on TXS)
Data rate (on-air): 9.6 kbit/s
Modulation: FSK and GMSK, supported BT = 0.3 … 0.5
Forward Error Correction: None
Pseudorandomization: Pseudorandomization using G3RUH scrambling polynomial
Data link layer protocol: AX.25 or HDLC

The following default RF parameters can be configured:
• Default RF parameters:
• Transmit frequency
• Receive frequency
• Modulation scheme
• Roll-off
• Symbol rate
• Transmit power
• CCSDS Spacecraft Identifier
• Data link layer protocol (AX.25 or HDLC)
• I²C watchdog implementation
• CSKB-lite connector configuration
• Grounding interface configuration

Qualification and Acceptance testing

Test QT AT
Functional
Vibration
Mechanical Shock
Thermal Cycling
Thermal Vacuum

*QT is performed on the design/qualification model
*AT is performed on the unit to be shipped

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