Profile: Communications Audit UK Ltd. designs and manufactures RF, digital equipment and sub-systems. We eye on defense, telecommunications, military and broadcast communications sectors. We manufacture products like HF tuner digitizers, antenna multi-coupler distribution units, antenna switch matrix systems that are switching and hot swap compliant, down-converters, super-resolution HF direction finding multichannel tuners, and frequency standard distribution units. Our devices are used in a wide range of electronics, surveillance systems, reconnaissance systems, and high performance commercial communications equipment. Our CA5551 switch matrix is designed to switch the signals from a number of antennas through a non-blocking full fan-out switching matrix in a multiple receiver system. It is configured to drive forty-eight hand-off receivers, and a single search receiver from any one of four antenna inputs.