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

[Doug Crompton]

The DMK-URI has more filtering. Whether it would be better or not would be
hard to predict. I don't think you have to buy a DMK-URI to solve your
problem. As I said try lead placement, antenna placement, ferrites.


*73 Doug*

*WA3DSP*

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



On Tue, Jul 4, 2017 at 1:47 PM, "kd4ont via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> 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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> >
> >
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