TC4 High-Speed High-Performance HF VHF Data Modem

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TC4 High-Speed High-Performance HF VHF Data Modem

A compact, high-performance modem, the TC4 is intended for integration into LF and HF (VHF/UHF optional) radio transceivers and provides an optional 2G or 3G ALE controller. For users requiring a low cost hardware modem that includes all MIL-STD and STANAG compliant waveforms, the TC4 provides value and a robust solution.

High Speed HF VHF Modem TC4 2G 3G ALE

Key Features

  • Low cost installation (Hardware)
  • Activation keys unlock software
  • 9600 bps in SSB channel (3 kHz)
  • 19200 bps in ISB channel (2 x 3 kHz)
  • MIL-STD and STANAG compliance
  • Low power consumption (1 W)
  • Compact size (33x55x8mm)
  • Single 100-way connector  


  • 2G ALE
  • 3G ALE
  • 3G Packet Data
  • V/UHF modem

Customisable Waveforms

TC4 waveforms can be customised by choosing from four LF/HF modem software options (M1-M4).

Data Modem Function 

Adaptive equalization mitigates the effects of channel multi-path. Convolutional encoding and soft-decision Viterbi decoding provides forward error correction.

Cancellation of narrowband co-channel interference is accomplished via adaptive tone excision capable of eliminating up to four signals.

UART 1 Data, Config, Control, or Raw Data (option) Rate: 4800 to 115200 bps
Electrical: 3.3V LVTTL
Flow Control (Raw data only): CTS/RTS, XON/XOFF
UART 2 Remote Control (when UART1 is Raw Data) Rate: 4800 to 115200 bps 
Electrical: 3.3V LVTTL 
Flow Control: None
CODEC 1 Baseband Audio USB (Analogue) Tx (output): 40 Ω unbalanced 2.0 V p-p 
Rx (input): 10 kΩ unbalanced 1.5 V p-p
CODEC 2 Baseband Audio LSB (Analogue) Tx (output): 40 Ω unbalanced 2.0 V p-p 
Rx (input): 10 kΩ unbalanced 1.5 V p-p
MCBSP 0 Data, Config, Control (option) Synchronous serial I/F McBSP port
MCBSP 1 Digital Baseband Audio (option) Synchronous serial I/F McBSP port
DISCRETE OUTPUT Radio Keyline Active high
DISCRETE INPUTS Radio PTT Sense Active low
PPS (GPS Time Sync.) Rising edge
Reset / Power Down Active low
SPEED SELECT Power Saving (Optional) [3:0], Active low
POWER Supply 3.3 V DC

* All TC4 interfaces via a single 100-way fine pitch connector (Samtec YFT-20-xx-H-05-SB).

TC4 High Speed High Performance HF VHF Data Modem