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

[kd4ont]

Would a dmk uri be less prone to rfi?

-------- Original message --------
From: Doug Crompton via arm-allstar <arm-allstar at hamvoip.org> 
Date: 07/04/2017  01:46  (GMT-05:00) 
To: ARM Allstar <arm-allstar at hamvoip.org> 
Cc: Doug Crompton <wa3dsp at gmail.com> 
Subject: Re: [arm-allstar] rf getting into cm108 shell-less fob on uhf
  motorola gr1225 repeater 

Terry,

 RF can cause strange problems and especially when you are running a
repeater in close proximity like you are. There are two RF signals very
close to one another in spectrum and physically. While it is hard to say
what it is in your case if it goes away when you get further away from the
repeater then it is probably RF getting into something. Try putting a dummy
load on the repeater and see if it goes away. You may need to use some
ferrites on the lead or reorient things.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


On Tue, Jul 4, 2017 at 12:38 AM, "Terry Bethlehem via arm-allstar" <
arm-allstar at hamvoip.org> 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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