[Mobile-Portable] self -QRM on 40m

[Chuck Mabbott]

I had company cars [Pontiacs of approximately the same
90] that my affect was 2 Meters would bounce the
speedometer around and modify the cruise control
slightly.  In later models this problem went away with
no changes in the radio.

But as suggested, check the grounds, look for service
reports on the vehical itself.  There may be some non
radio issues that are just reacting to RF in the
vehical.  I see no harm in the ferrites being put on
also.

Chuck AA8VS


--- Art Clemons <n8blk@aol.com> wrote:
> 
> 
> ka5mgl@conwaycorp.net wrote:
> > Hi everyone; 
> > 
> > My HF mobile installations works well, but suffers
> from one annoying problem.  On 40m (only), the
> tachometer moves with my speech;  like a VU meter.  
> The rig is an Icom 706MKIIG feeding a hamstick
> mounted off the rear bumper of 1990 Nissan KingCab
> pickup.  The SWR is less than 1.5.  The same thing
> happens elsewhere on 40m -- but *only* on 40m. 
> Operating on 75m, 20m, and 10m doesn't do this.  
> > 
> > Thoughts, comments, suggestions?
> 
> 
> Well, if nothing else is going crazy, you can try
> ferrites on the tach 
> cable.  Of course this problem does indicate the
> likely need for a 
> better ground system in your vehicle but if you're
> otherwise happy, 
> ferrites should work.
> 
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=====
Chuck Mabbott   
http://68.43.100.7:81/aa8vs


Whoever says, "money can't buy you happiness" 
should turn their savings over to me, then stand
back and be prepared to stand corrected.

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