RM34 — Ultra-Wideband SDM

The RM34 Ultra-Wideband (UHF) Software Defined Modem (SDM) is a purpose-built standalone hardware platform for high-capacity data communication over V/UHF radio channels. Equipped with a 70 MHz intermediate frequency (IF) digiti s er, the RM34 supports the STANAG 4691 V/UHF Time Division Multiple Access (TDMA) waveform family, enabling data rates of up to 1.92 Mbps across 500 kHz V/UHF radio channels.

Designed to meet the requirements of naval and government end users, the RM34 delivers high-performance, long-distance line of sight (LOS) data communications for strategic and maritime operations. With its ability to achieve data rates of up to 1.92 Mbps in 500 kHz UHF LOS channels, the RM34 offers data speed, quality, and security comparable to SATCOM systems without the associated infrastructure.
The integrated V/UHF waveforms address the increasing need for higher throughput to support internet protocol (IP) based data exchange and emerging high-capacity applications. These include naval and strategic situational awareness systems, enabling effective command and control (C2) across diverse operational environments.

V/UHF Data Modem

The RM34 modem implements STANAG 4691/AComP 4691 (Edition 1) Annex B to E, which specifies a family of V/UHF waveforms. These waveforms, described in Annex B to E of the STANAG 4691 specification, cover 25, 100, 300 and 500 kHz bandwidths.
The waveform family incorporates a block interleaver supporting four different interleaver lengths, with the length determined by the selected waveform family (bandwidth). Phase Shift Keying (PSK) and Quadrature Modulation (QAM) techniques are employed for encoding user data. Crucially, data rate and interleaver settings are explicitly transmitted as part of the waveform, included in the initial and periodically reinserted preambles. This feature allows the receiving modem to extract data rate and interleaver settings from incoming transmissions.

System Integration
The RM34 is the cornerstone of the Rapid Mobile recommended STANAG 4691 MARLIN V/UHF system solution. Seamlessly integrating with the RC34 MARLIN Node Controller, the RM34 facilitates high-capacity data transmission over V/UHF radio channels via the 70 MHz radio interface.
The RC34 Ultra-Wideband Network Controller complements the RM34 by conforming to STANAG 4691 Annex A, which includes functionalities such as automatic network discovery and error free data delivery using the embedded ARQ protocol. Together, the RM34 and RC34 provide a robust, integrated solution tailored to the needs of naval and government end users.

Deployment
The RM34 features a compact ½ 1U, 19-inch rack mountable form factor, offering flexible deployment across a wide range of platforms including surface vessels, submarines, airborne assets, and fixed land based installations. The standard interfaces offered by the RM34 seamlessly integrate with V/UHF transceivers, cryptographic equipment, and management systems, facilitating convenient deployment in various operational environments.