[FADCA] KPC 3 Noise

19 Aug 2003 16:38:57 -0400

I have a KPC3 and a KPC3+ on APRS. Both have been used in my work truck
which often people tell me must be wrong since I am not on any roads.
Well they are right, 50% of my daily drives are off road on cattle
pastures or orange groves in 4WD.

I got to admit I will often <grin> drive a bit faster than I should on
these roads and my head is very familiar with the headliner. I have no
noise or any other problems and I drive HARD every day.

One has seen over 100K miles mostly off road in 3 years and the other
has seen about 30K miles of normal driving. So I would not say it is a
common problem, maybe a batch problem depending on what is found to be a
fix but not common.

Rich

On Tue, 2003-08-19 at 14:54, Paul J. Toth-NA4AR wrote:
> Doug....
> 
> I have not heard of this problem previously.  Sounds like something has gone
> astray inside the unit.  You might try opening the unit up and making sure
> all the ICs inside are seated properly.  A loose connection could be causing
> the grief.
> 
> 73 de Paul-NA4AR
> 
> ----- Original Message -----
> From: "Doug Christ" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, August 19, 2003 2:44 PM
> Subject: [FADCA] KPC 3 Noise
> 
> 
> > At a recent hurricane seminar, I set up a portable APRS station which did
> > not work. The KPC3 tnc was generating so much rf hash that it wiped out
> the
> > receiver on the HT. Heck, it even interfered with radios not even
> interfaced
> > into the APRS setup. The signal is full scale on the HT and the signal
> > completely disappears when I power down the tnc. I even powered down the
> > laptop and the tnc would be the only thing on. BTW, I was running it off
> of
> > a 9 volt battery, not a AC adaptor. I had noticed that I was having
> problems
> > in the past using this unit but usually I am at a FPAC switch working on
> it
> > so it really did not take much of a signal to make the tnc work.  I broke
> a
> > out a spare KPC3 only to discover the same problem. Someone ran home and
> > grabbed their own KPC3 which worked better but still had the same
> problems.
> >
> > Anyone have any ideas as to where this noise is coming from and what I can
> > do to stop it? I used the same laptop, tnc and radio before for field day
> > operations and it worked fine.
> >
> > Doug/KN4YT
> >
> >
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