[ICOM] Help needed with noise on HF in the mobile

[Des Pendergast]

Hello William and other watching this.  Thanks for the comments.
Exhaust pipe could be a consideration.  Do you think that this could be
antenna induced as I indicated with my 'rough' test?

Des.


----- Original Message ----- 
From: "William Lambing" <w0lpq9 at msn.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Friday, June 02, 2006 9:11 AM
Subject: Re: [ICOM] Help needed with noise on HF in the mobile


I have my IIg in my 2000 Pontiac GP GT.  The body is mounted in the
trunk and remoted to the lower center dash area.  My noise was S-8.
Looking at the way things were grounded (or lack of it) I found some
stray brass strip from my days at Collins in Cedar Rapids.  Using a
metal wire brush, I cleaned the exhaust tips on both exhausts.
Purchased some SS exhaust clamps for this use also.  Ran the brass
strips (which were 1.5" wide) from the exhaust tips to the frame made
the noise drop to S-2.

The radio is mounted on an aluminum plate in the trunk.  The 13.8V feed
runs to the back onto the plate through a Sprague Hi-Pass mounted on a
bracket.  The cap has screws on both sides and on both sides I have .001
and .01 caps to ground via terminals.  I then decided I would ground the
plate to the frame via a flexible braid (about 1.5" wide) about 9" long
to frame ground.

At the moment, My noise is S-1 to S-2.  That I can live with.  Since
yours is mounted on the front, you might consider straps on the hood to
frame ground.  Try the exhaust pipe also, as mine was insulated via
rubber bushings for sound deadening.

Bill, W0LPQ
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