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Customised Embedded Modem Software

For clients requiring embedded software solutions, the RapidM HF Radio Data Modem and ALE (2G ALE & 3G ALE) functions are available as small-footprint embedded software modules, which are customized for specific hardware and interface requirements. RapidM can assist with integration into the existing software structure.

This option is ideal for upgrading existing radios or for Software Defined Radio (SDR) developments. Several world-leading radio makers are using our HF Radio Modem and ALE software in presently fielded radios, which run into thousands. The performance and functionality is determined by the available computational and memory resources.

The waveform software is compliant with MIL-STD-188-110A & B, STANAG 4539, 4415, 4285, 4529 and 4481. The ALE software is compliant with MIL-STD-188-141A and MIL-STD-188-141 Appendix A and Appendix B (Linking Protection). The 3G ALE implementation is compliant with STANAG 4538 and supports Burst Waveforms 0-5, CLC, FLSU/FTM, ACS, LP, ALM, LDL and HDL. Various DSP processors are supported.

For further information, please contact Stephan Isebeck at  

Customized ARQ and E-mail Software

RapidM can provide clients customised PC and embedded STANAG 5066 and HF E-mail Components. This software is compliant with STANAG 5066.

RapidM embedded software for STANAG 5066 runs in a mature HF radio product range including man-pack, vehicle and base station radios. Interoperability of other HF E-mail solutions has been tested extensively. The HF E-mail Client PC software supports this range and is interoperable with standardized STANAG 5066 softwares.
For further information, please contact Stephan Isebeck at

Adding HF Data Modem capabilities to existing HF Radio models

For radio makers that would like to add advanced HF data modem & ALE capabilities to their existing HF radio product range, we can customise the small form factor TC4 HF Data Modem Module in the form of a plug-in option board for the radio. We work closely with the radio maker's engineers to ensure smooth integration of the option board into the radio.

For further information, please contact Dr. Danie van Wyk or e-mail us at

Modem products with NATO and MIL standards for interoperable HF radio

The company is at the forefront of modem related products that comply with NATO and MIL interoperability standards for
HF radio:

STANAG 5066 Protocol stack and e-mail clients
STANAG 4539 PSK/QAM Data modem waveform
STANAG 4415 PSK Data modem waveform
STANAG 4285 PSK Data modem waveform
STANAG 4529 PSK Data modem waveform
STANAG 4538 ARCS (Automatic Radio Control System)
MIL-STD-188-110A PSK Data modem waveform (serial mode)
MIL-STD-188-110B PSK/QAM Data modem waveform
MIL-STD-188-141B 2nd Generation ALE (Automatic Link Establishment)
MIL-STD-188-141B 3rd Generation ALE (Automatic Link Establishment)

RapidM has a strong drive toward well-engineered, quality solutions with very high performance characteristics.