[Mobile-Portable] Ford Excursion

[N5WV]

Thanks for the help.  Randy   N5WV 
----- Original Message ----- 
From: "Dick Flanagan" <dick at k7vc.com> 
To: "Mobile-Portable Reflector" <mobile-portable at mailman.qth.net> 
Sent: Thursday, September 17, 2009 1:31:46 AM GMT -06:00 US/Canada Central 
Subject: Re: [Mobile-Portable] Ford Excursion 

At 10:45 PM 9/16/2009, N5WV wrote: 
 >Hello Group. Im new to this group so bare with me.  I have a 
 >2003 Ford Excursion  6.0 diesel. I want to make a communications 
 >vehicle out of it similar to the ones used by the Red Cross.  The 
 >only modification that I have done so far is upgrading the alternator 
 >to a 250 amp unit.  But this vehicle has noise problems at HF. 

The very first step is to ground the end of the tailpipe to the frame 
using a short length of flexible braid.  I strip the shield off an 
appropriate length of RG-213.  Most tailpipes are insulated from the 
frame to minimize vibration.  This results in a nicely radiating 
quarter-wavelength antenna.  All the QRN from the engine is radiated 
via the tailpipe.  Ground it first and then try your other remedies. 

Dick 
-- 
Dick Flanagan K7VC 
dick at k7vc.com 


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