Flight Heritage since 2012

ISIS UHF uplink/VHF downlink Full Duplex Transceiver


  • Full duplex communication
  • Data rate re-configurable in-flight
  • Receiver loopback mode
  • Safety watchdog
  • Low power consumption
  • Single PCB radio
  • Single board Telemetry, Telecommand and Beacon capabilities
  • Flight heritage since 2012

Option sheet

Availability: 8-12 weeks

  • Description
  • Product properties
  • Performance
  • Configurations
  • Testing


The ISIS VHF downlink/UHF uplink 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 and 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.

Product properties

  • Mass: 85g
  • Dimensions: 96 x 90 x 15 [mm]
  • Supply voltage range: 6.5 – 12.5 V DC
  • Power consumption:
    • 0.2W (receiver only)
    • 1.7 W (transmitter on)
  • Operating temperature: -20 to +60 deg C
  • RF interfaces: MMCX (50 ohm)
  • Data interfaces: I2C


  • 145.8 – 146 MHz (amateur-satellite VHF allocation). Other ranges available on request
  • Transmit power: 23 dBm
  • Modulation options:
    • Binary Phase Shift Keying (BPSK)
  • Data rate selectable: 1200, 2400, 4800 and 9600 bps
  • Data link layer protocol: AX.25


  • Frequency range: 435 MHz – 438 MHz
  • Modulation:
    • Audio Frequency Shift Keying (AFSK)
  • Data rate: 1200bps
  • 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 or CW)
  • CSKB connector type and location
  • RF connector position and orientation
  • I2C watchdog implementation
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