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CPUT S-Band CubeSat Transmitter

Product code: 35-02550

This product is customizable, prices are based on requirements.

For more detailed pricing, and to request a quote please submit an enquiry.


The STX is a compact S-Band Transmitter designed for CubeSat missions. It is compatible with the CubeSat standard, This is ideal for space missions where a high data-rate downlink is needed.

The STX implements QPSK modulation with transmission data rates of up to 2 Mbps. The uses an open network encoding scheme based on the IntelSAT IESS-308 specification which makes this product compatible with low-cost commercial receivers.

A nadir facing S-Band patch antenna can also be incorporated into the CubeSat design. Its small size, low profile, rugged design and high directionality make it an excellent addition to the system.


  • Total power consumption < 5 W for maximum RF power output
  • Transmission data rates up to 2 Mbps. 
  • Support for amateur bands (2.4 - 2.483 GHz)
  • Industry standard encoding and modulation techniques
  • Simple digital interfaces. I2C interface for Control / Telemetry. SPI interface for payload data.
  • Transmit output power adjustable from 24 dB to 30 dB. Adjustable in 2 dB steps


  • Temperature: -25°C to +61°C
  • Power Consumption: < 5 W
  • Mass: < 100 g
  • Dimensions: 96 mm x 90 mm
  • Voltage: 6 V – 12 V
  • Frequency:  2.4 GHz – 2.45 GHz 
  • RF Power: 1 Watt (30 dBm)
  • Channel Spacing: 500 kHz
  • TX SNR: > 20 dB
  • Spurious Response: < -60 dBc


  • Flight Board
  • User manual
  • STEP model