Our Dual Modulator System (DMS) is compliant with NATO STANAG 5030 Edition 4, NATO STANAG 4724* and upgradable to be NATO STANAG 5065 compliant.

The DMS is a derivative of the Drumgrange Traffic Formatter, Modulator, Synthesiser and Antenna Tuning system (TMSAU), which was specifically designed to comply with NATO STANAG 5030 requirements and was one of the first in its class to be fully compliant against this standard. 

Today, the DMS supports FSK, MSK1, MSK2 and MSK4 together with OTAM, keystream interfacing, antenna fine tuning and remote control. It can be supplied as a single modulator system if required.

Similarly to the Demodulator, the DMS was developed using our proprietary complex numerical modelling environment, which supports link budget estimation, seawater penetration predictions and provides overall system performance analysis.  

* Currently pass-through mode (ALT LEF); future Black side hardware and interface are compliant.

Developed alongside Hagenuk Marinekommunikation, the RRP functions as both a RED REM encoder at headquarters and a decoder on receive platforms.

• Supports legacy traffic and the new REM modes
• Works with existing modulator and demodulator equipment
• Four independent channels
• Data Formatting: NATO STANAG 5030/4724
• Works with KIV-7M Cryptos or similar Local or Remote Control (RS422)
• Time of Day input: STANAG 4430 (XHQ Message, 1PPS and 1MHz)
• Extensive Built in Test Facilities
• TEMPEST: SDIP-27 Level B

Our proprietary numerical computer simulation model can provide users with an interactive graphical environment to evaluate the communications performance of various VLF systems.

Our model was developed in Matlab, implemented in Simulink (running within Matlab) and validated using actual sea trials data.

How it works:

• The model measures communication performance by measuring the character error rate for a given system configuration and signal to noise environment.
• Decoded characters are compared with the original characters transmitted and a record of the number of characters tested in a trial.
• The model logs the number of errors detected and the associated character error rate.
• Users can adjust various parameters to conduct parameter sensitivity assessments. Examples of adjustable parameters include signal timing delays and atmospheric noise, introduced via a Gaussian Noise model

The partner of choice for your VLF projects.

Drumgrange offers VLF consultancy services based on significant technical understanding of the overall VLF systems. In addition to the provision of critical technical guidance, subject matter advice and Design Authority advice on the overall VLF system, we specialise in picking up communications issues and constraints which might not be immediately apparent to the design team.

How we can contribute:

• As a VLF communications advisor supporting the programme team
• By providing critical technical guidance using the project design and testing phases
• By providing modulators, demodulators and interconnectivity equipment to meet specific programme<>requirements.
• By supporting experimentation and sea trials activities that would be needed to demonstrate performance of the system, for example by providing guidance on test plans, VLF communications performance measurements, providing specialist test equipment, or providing analysis of communications performance.