[K3PZN-List] Curious behavior from my mobile radio...

[James Owen]

Hi Bill,
   I think what you might be hearing is leakage from
the cable TV system. This is usually the way it
behaves and 145.41 is very near channel 18, 145.25Mhz,
of the cable channel frequencies. The signal is so
broadband, 6 Mhz, that the power is spread and the
S-meter reads little or nothing but the rig sees it as
noise and tries to squelch it but it's more than the
range of the squelch. Other newer rigs with a more
selective front end can many times reject it. I have a
little of this with my FT-8800 and even at one spot on
440 Mhz. I think you will just have to live with it or
call the cable system and complain. Maybe they will
check out a given location it there are enough to
complain.
73 Jim K4CGY
--- "Neeriemer, Bill (NIH/NLM/LHC) [C]"
<bneeriemer at mail.nih.gov> wrote:

> I have an Alinco DR-119T mobile radio in my truck. 
> It is ~13-14 years
> old.
> 
> Steve checked it out this year, and pronounced it in
> good shape.
> 
> It appears to be very sensitive on the receiver
> side.
> 
> I've discovered that when driving around
> Westminster, the squelch will
> break open on a signal, which registers no power on
> the S-meter.
> 
> This happens regardless on the squelch setting. 
> However, my Yaesu VX7
> doesn't detect anything.
> 
> It only happens on 145.410.  I have checked other
> freqs, although, it
> wasn't a comprehensive analysis.
> 
> I wondered if my radio's circuitry is faulty, but if
> that were the case,
> then I would expect the squelch breaking to be
> random, but this isn't
> random.  That is, if my squelch breaks in a
> location, it always breaks
> in that location.
> 
> The squelch breaking is 'stroby'. That is the areas
> that it breaks are
> very confined.  If I drive forward a couple of feet,
> it stops.  It isn't
> time based, because if I back up, it returns.
> 
> Also, whatever is causing it, it is continuous, if I
> stay in a noisy
> zone, the squelch remains open until I leave.
> 
> I don't think that it is a modulated signal, because
> I hear nothing but
> static.
> 
> I mentioned this at the BoD meeting, and heard that
> electric motors can
> cause this.
> 
> While, I haven't checked too far from Westminster,
> so far, I have only
> noticed this is downtown Westminster.
> 
> Have others noticed this behavior?
> 
> Comments?
> 
> 73 Bill W3STG
> 
>  
> 
>
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> 
>
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James C. Owen, III K4CGY

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