The 70cm repeater I run is suffering from what sounds like electrical noise, Having checked the input frequency with a spectrum analyser and the source was traced to a suspected M.o.D. source who share the same band in the UK. I can't ask them to switch off as they are the primary user. I was thinking about making an audio filter using digital delay and a fast switching mute so that the nose spikes are muted before being re-transmitted. Has anyone done this or is there some filter I could buy? 73s Phil G0EPX
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