RF Products

Drumgrange acquired Raven Research Ltd, a unique RF engineering design and production company which specialised in developing custom RF products for the defence and security industries. Drumgrange supports existing customers where possible. Drumgrange has already delivered a number of projects that have incorporated RF products e.g. V/UHF Airfield radios, ComSim Bowman training system and a variety of others. The RF Product Range broadly covers RF Distribution, Direction-Finding and Training and Simulation System components.

The RF distribution product range can be broken down into the following categories:


The Drumgrange range of multicouplers provides comprehensive protection from high-level signals and electrostatic discharge. Some key features include:

  • Frequency range 1.5 MHz to 2GHz
  • Choice of standard control protocols
  • AC/DC power options
  • Wide choice of standard and non/standard connectors

Multicouplers are designed to allow a set of radio receivers to simultaneously connect to a single antenna (single input, multiple output).  As well as providing improved radio system performance, the range of multicouplers also provide the system with comprehensive protection from high-level signals and electrostatic discharge.

When multiple antennas are required to be connected to multiple receivers a switching matrix is needed. When the system also requires any number of receivers to be connected to any antenna simultaneously, the matrix is termed non-blocking. Drumgrange make a range of non-blocking matrix switch units for switching/routing off-air signals to receivers. 


                                         HF Multicoupler - 4 Way                                                                          Multicoupler


Non-Blocking Matrices & Switches

The non-blocking matrices are housed within a single 19" rack mounting enclosure, complete with control module and mains power supply. Some key features are:

  • Excellent RF Performance with Low Noise Figure and High Dynamic Range
  • Choice of Standard Control Protocols
  • Ancilliary units for integration of Antenna Matrix Switching Systems

Signal exchange units can be configured to provide independent matrix switching of inputs to outputs. By combining the two units with a series of single-pole, double-throw RF switches on the output, the system becomes a non-blocking multi-input x multi-output matrix system.  Switch sizing is solely dependent on the selection of matrices hence a variety of systems can be configured in this way.


Masthead Pre-Amplifiers

A range of wideband masthead pre-amplifiers to cover the VHF/UHF bands are available. These pre-amplifiers greatly improve the RF sensitivity of fixed-site and transportable systems, whilst preserving maximum dynamic range. Key features of the wideband masthead pre-amplifiers used for monitoring and communication systems are:

  • Low Noise Figure for maximum sensitivity
  • High 2nd Order and 3rd Order Intercept Points for maximum dynamic range
  • Input Protection against high level signal, lightning and EMP
  • Ruggedised waterproof enclosure for external mast mounting
  • Bias 'T' for power through RF cables
  • Amplitude equalisers for long cable runs over wide frequency ranges


RF Components

In addition to the specific products identified above, Drumgrange supply a range of general RF products.  The products listed below cover a wide range of frequency bands and have different types of connector configurations. These components can be re-configured to address any customer requirements. 

  • Band Pass Filters from 10kHz to 1200MHz
  • Bias T Units
  • RF Couplers
  • Diplexers
  • Cable Equalisers
  • RF Power Splitters
  • RF Power Combiners


Radio Direction-Finding

Drumgrange has a wide range of radio direction-finding (establishment of the direction from which a received radio signal was transmitted) products. Some of these products are highlighted below:

  • Land mobile, covert RDF systems for radio regulatory enforcement
  • Land mobile, covert RDF systems for radio interception
  • Fixed Site VHF/UHF radio direction finding
  • Fixed Site HF radio direction finding for SSL
  • Shipboard RDF for surveillance and ESM
  • Airborne VHF/UHF radio direction finding for surveillance


                                        RF Products                                                                                 HF Matrix controller



                                                                                                     Passive Comsim

If you have any other questions, please contact us at info@drumgrange.com.