RF breakthrough and earth loop current issues tend to happen when a transceiver is in transmit mode (keyed). You will hear a buzz or your own distorted voice coming out of the audio. The two main reasons are a poorly matched antenna, which results in RF being reflected back into the radio room, or a difference in ground currents between pieces of equipment. RFI issues are usually caused by reflected waves coming back down the outside of the coax while earth loop problems are usually caused when the same power supply for the radio and ‘add-on’ audio equipment is being used. The bhi GroundBreaker is a quick and easy solution for this issue because it isolates the grounds of your external audio equipment from those of the radio system and prevents ground loops and associated RFI problems from getting into your audio. The bhi GroundBreaker is easy to install and simply fits in between your radio and audio equipment. Connections are 3.5mm mono or stereo and no extra leads are usually required. There are six versions available to match most impedances:

Order code GB8M: 8Ω Mono

Order code GB8S: 8Ω Stereo

Order code GB600S: 600Ω Stereo

Order code GB10KS: 10kΩ Stereo

Order code GB600M: 600Ω Mono

Order code GB10KM: 10kΩ Mono

All versions are available from bhi Ltd, Tel: 01444 870333, or one of their authorised stockists. Price £29.95 inc. VAT.

www.bhi-ltd.com

This article was featured in the February 2019 issue of Practical Wireless