The ISIS UHF/VHF transceivers are full duplex communication systems for CubeSat TT&C applications. The two variants of this product are TRXUV (UHF uplink/VHF downlink) and TRXVU (VHF uplink/UHF downlink). Both radios can operate in commercial and amateur bands of the VHF/UHF frequency spectrum and are low power, low mass, and highly configurable, offering the flexibility of changing data rates and frequencies in flight. These radios are tailored for CubeSat missions and cross compatible with other subsystems such as on-board computers and antenna systems. Both the TRXUV and the TRXVU are flight proven since 2012 and 2016 respectively, with over 75 units delivered.

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Last updated: 2020-12-11

VHF uplink/UHF downlink Full Duplex Transceiver


  • CAD model(1.87 MB)
  • Datasheet(1.54 MB)
  • ICD
  • Option sheet(463.3 KB)
  • User manual


75 g
90 mm
96 mm
15 mm
power consumption
0.48 W (receiver only)
4 W (transmitter on)
supply voltage range
6.5 — 20 V DC
operating temperature
-20 to 60 C
data interface
communication channel
full duplex
transmit power
27 dBm
transmit frequency1
435 to 438 MHz
400.15 to 402 MHz
transmit modulation
Binary Phase Shift Keying (BPSK) with G3RUH scrambling
Gaussian Minimum Shift Keying (GMSK) with G3RUH scrambling
datalink layer protocol
transmit data rate
1200 b/s
2400 b/s
4800 b/s
9600 b/s
receive data rate
9600 b/s
receive frequency
145.8 to 146 MHz
148 to 150.05 MHz
receive modulation
Frequency Shift Keying (FSK) with G3RUH scrambling
-104 dBm Sensitivity for BER 1E-5

1. Other ranges available on request.


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