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

[Paul Gates, KD3JF]

I bet if you bond the exhaust pipe your will have the solution. Do you have a problem doing that? 
  
Paul, KD3JF 
Glen Burnie, MD 
FM19qd (Map Grid Square) 
 
 
 
----- Original Message ---- 
From: Des Pendergast  
To: ICOM Reflector  
Sent: Thursday, June 1, 2006 8:04:57 PM 
Subject: Re: [ICOM] Help needed with noise on HF in the mobile 
 
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"  
To: "ICOM Reflector"  
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 
---- 
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net 
Icom Users Net: Sundays, 1700Z, 14.316 MHz 
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---- 
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net 
Icom Users Net: Sundays, 1700Z, 14.316 MHz 
Icom FAQ: http://www.qsl.net/icom/