TC4-LP HF & V/UHF Modem, ALE and Voice Module

TC4-LP HF & V/UHF Modem, ALE and Voice Module – 3G, 3, 6 kHz

The TC4-LP is a high-performance LF, HF and V/UHF modem, ALE and voice module. The TC4-LP is optimised for low power consumption. The module is suitable for integration into LF, HF and V/UHF radios and other communication equipment. The TC4-LP is recommended for new designs.

The TC4-LP offers the same functions found in the TC4, including HF/VHF/UHF data modems, 2G ALE and 3G ALE/STANAG 4538. In addition, the TC4-LP hardware can host the RapidM EF-256 embedded functions, which include Secure Digital Voice (SDV) and AES-256 Encryption.

For V/UHF operation the maximum data rate is 128000 bps in a 24 kHz audio channel.

The operation of the TC4-LP is determined by the selection of one of the following software packs:

  • M1: LF and HF Modem (Including ISB, Up to 19200 bps & 110C 6 kHz up to 32000 bps)
  • M2: HF Modem (SSB, Up to 9600 bps)
  • M3: HF Modem (SSB, broadcast, Up to 2400 bps)
  • M4: HF Modem (SSB, S4539, Up to 9600 bps)
  • L1: V/UHF Modem (24 kHz, Up to 128000 bps)
  • L2: V/UHF Modem (12 kHz, Up to 64000 bps)
  • L3: V/UHF Modem (6 kHz, Up to 32000 bps)
  • L4: V/UHF Modem (3 kHz, Up to 16000 bps)

The following software options are also available:

  • 2G ALE Controller Software Option
  • STANAG 4538 (3G ALE) Modem Option
  • Digital Voice (2400 bps)
  • 56-bit Encryption (Digital Voice and Data)

Features and Benefits

TC4-LP Module Platform

  • Low Power Consumption (600 mW Typical)
  • Very Compact Size: 33 x 55 x 6 mm
  • Easy System Integration
  • Single 100-Way Connector
  • LF, HF and V/UHF Radio Compatibility
  • Analogue or Digital Radio Audio Interface
  • Radio Control for ALE Channel Scanning
  • Standardised Remote Control Protocol (RIPC/RAP1)
  • SSB Data: 9600 bps (3kHz)
  • ISB Data: 19200 bps (2 x 3kHz)
  • MIL-STD-110C Modes: 32000 bps (6kHz)
  • Broadcast and Ship-Shore (BRASS) Compatible
  • TC4 Evaluation Kit


LF & HF Software Packs (M1-M4)
Software Pack
M1 M2 M3 M4
MIL-STD-188-110C Appendix D (3 & 6 kHz)
MIL-STD-188-110B (QAM)
MIL-STD-188-110B Appendix F (QAM)
MIL-STD-188-110A (8-PSK)
STANAG 4415 (NATO robust)
STANAG 4285 (8-PSK)
STANAG 4529 (NB 8-PSK)
FSK Variable

V/UHF Modem Software Packs (L1 – L4)

  • Wideband up to 128000 bps (Coded) in a 3 kHz
  • Narrowband up to 16000 bps (Coded) in a 3 kHz
  • High Data Rate (HDR) Modem
  • External ARQ Interface (e.g. S 5066)

2G ALE Controller Software Option

  • MIL-STD-188-141B App A
  • FED-STD 1045
  • Occupancy Detection
  • MIL-STD-188-141B App B
  • FED-STD 1049 Linking Protection

STANAG 4538 (3G ALE) Modem Software Option

  • 3G Link Setup (Fast Link Setup) (FLSU)
  • Data Transmitted as Packets
  • LDL and HDL Data Link Protocol (ARQ)
  • Circuit Link Controller (CLC)
  • Linking Protection
  • Occupancy Detection

56-bit Encryption and 2400 Vocoder Software Options

  • Encrypted Voice and Data Communication
  • MELPe Voice Coding (US Customers Only)
  • TWELP Voice Coding by DSP Innovations Inc. (
  • Improved Voice Quality in Noisy Channels
  • See Also: EF-256 Embedded Functions for Secure Voice and Data
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