ISIS UHF downlink/VHF uplink Full Duplex Transceiver

Flight heritage since 2016

ISIS UHF downlink/VHF uplink Full Duplex Transceiver


The ISIS VHF uplink/UHF downlink transceiver is a full duplex communication system for CubeSat TT&C applications. The radio can operate in commercial and amateur bands of the VHF/UHF frequency spectrum. It is low power, low mass, and highly configurable, offering the flexibility of changing data rates and frequencies in flight. This radio is tailored for CubeSat missions and cross-compatible with other subsystems such as onboard computers and antenna systems. Flight proven since 2016.
Availability: 8 – 12 weeks

Sold By : ISISPACE Category:
  • Features
  • Product properties
  • Performance
  • Configuration
  • Testing
  • Documents
  • Full duplex communication
  • Data rate re-configurable in-flight
  • FM transponder mode available
  • Safety watchdog
  • Low power consumption
  • Single PCB radio
  • Single board Telemetry, Telecommand and Beacon capabilities
  • Dimensions: 90 x 96 x 15 mm
  • Mass: 75g
  • Supply voltage range: 6.5 – 20 V DC
  • Power consumption:
    • 0.48W (receiver only)
    • 4 W (transmitter on)
  • Operating temperature: -20 to +60 deg C
  • RF interfaces: MMCX (50 ohm)
  • Data interfaces: I2C


  • Frequency range: 435 – 438 MHz or 400.15 – 402 MHz. Other ranges available on request
  • Transmit power: 27 dBm
  • Modulation options:
    • Binary Phase Shift Keying (BPSK) with G3RUH scrambling
    • Gaussian Minimum Shift Keying (GMSK) with G3RUH scrambling
  • Data rate selectable: 1200, 2400, 4800 and 9600 bps
  • Data link layer protocol: AX.25 or HDLC


  • Frequency range: 145.8-146MHz and 148-150.05MHz
  • Modulation:
    • Frequency Shift Keying (FSK) with G3RUH scrambling
  • Data rate: 9600 bps
  • Sensitivity: -104 dBm Sensitivity for BER 1E-5
  • Data link layer protocol: AX.25
  • Receiver/Transmitter operating frequency
  • Downlink data rate
  • Custom beacon message (AX.25)
  • CSKB connector type and location
  • RF connector position and orientation
  • I2C watchdog implementation

Qualification and Acceptance testing

Test QT AT
Mechanical Shock
Thermal Cycling
Thermal Vacuum
Total Ionizing Dose

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