> "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > Thanks Skipp I will take a good look at the audio cables. > This configuration has worked well for many years and we > added IRLP a year ago but it is external.
Consider any added wiring to/from the back plane external devices. > The hum is not present when you kick over the repeater > and let it ID. It is only present when a signal comes > in on the receiver. I would suspect the RX Audio inbound to the repeater controller is not properly protected or there is a missing ground... or there is a ground loop. You didn't say if you use discriminator audio, the Squelch Gate Module version or something different from the R1-Audio Card/Module. > So first guess is it's all OK under transmit so ripple on > the power supply is doubtful. The Audio from the controller > must be fine also. I suspect the audio cable from the > receiver or some other cable has come loose and lost it's > shield. I will post what I find. > Bill N5ZTW good luck cheers, s.
