[Icom] RE: Mobile Noise Supression Help Needed

Wed, 21 Aug 2002 13:59:35 -0600

Hi,
One maybe  related topic, on some Subaru cars, poor grounding is known 
to cause poor engine performance.
73,
Tony, VE6CGX

Dick Flanagan wrote:

> At 06:27 AM 8/21/2002, Denis G. Barton wrote:
> >Dick, what did you use to hold the RG-8 shield to the tail pipe?
>
> I cut the braid to length and crimped an uninsulated lug on each end.  
> I then attached each end with a #8-3/8" self-drilling sheet metal 
> screw with external-toothed lock washer.  Alternatively, take your car 
> and the shield to a muffler shop and they will be happy to tack-weld 
> each end to the frame and pipe.
>
> Whenever I have a noise problem, I actually make up a dozen or so of 
> these lugged shields and go around the car with my electric drill and 
> bond every distinct panel to the body, frame or its adjacent 
> neighbor:  hood, doors, fenders, side panels.  I also make it a point 
> to crawl under the car and make sure the body is bonded to the frame 
> in at least two locations.
>
> But do the tail pipe first.  I can't speak for any vehicles other than 
> my own, but this has always eliminated 80-90% of any ignition noise I 
> was experiencing.
>
> This does NOTHING for RF feedback or charging system noise 
> ("alternator whine"), each of which require different methods.  My 
> personal rule of thumb (I do a lot of mobile operating) is when I 
> install a radio I am careful to ground the radio where it is mounted, 
> run separately-fused power cables directly to the battery and ground 
> the tail pipe.  Only if I then experience noise do I take further steps.
>
> So far on both of my current mobile IC-706s (this is the ICOM 
> reflector, after all), when I am monitoring 75 meters I can't tell 
> whether my engine is running or not.  They are currently installed in 
> an old 86 Ford F-150 (aka pickup truck with Magnecor wires and full 
> bonding) and a year-old Chevy Tahoe (aka Suburban with tail pipe 
> bonding only).
>
> If anyone would like any additional generic non-ICOM-specific help, 
> please contact me directly at [email protected] or join the 
> [email protected] reflector.
>
> 73, Dick
> -- 
> Dick Flanagan W6OLD OOTC CFII Minden, Nevada
> Visit http://www.cvrc.net
>
>
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>