[arm-allstar] rf getting into cm108 shell-less fob on uhf motorola gr1225 repeater

[David McGough]

Terry,

This is likely some type of ground-loop condition in the RPi3 / audio
signal path, combined with RF from the HT....Does the noise ever go away
completely, when you're transmitting?

73, David K4FXC



On Tue, 4 Jul 2017, "Terry Bethlehem via arm-allstar" wrote:

> I'm getting a combination buzz and tone anytime I get a ht near the 
> 1225. It used as a mobile node. The 1225 has been turned down to 1W. I'm 
> not getting any interference when the repeater keys up. The ht is 
> running at 1W. In the car, the 1225 is in the passenger seat floor. When 
> I shuffle around the pi, fob, cables and 5vdc battery, the sound gets 
> louder or softer. If I start to tx with the ht and move it around, when 
> I get it near the fob and interface, it gets very loud.  Some times, 
> like when I first hooked it up a week ago, I had no noise. It acts like 
> it comes and goes. I can make a youtube video of my setup if that helps.
> 
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