[amsat-bb] Re: Automobile Noise

Edward Cole kl7uw at acsalaska.net
Wed Apr 15 20:17:07 PDT 2009

At 08:57 AM 4/15/2009, BobsImsai8800 at aol.com wrote:
>Hi all -- some facts I have learned about 
>automobile noise  after 40 years in the 
>profession. DEALER FIX:   While dealing with 
>many different professional  communications 
>users, I found that the automobile industry 
>usually has  a kit to fix most RF and electrical 
>noises that are generated by the auto  and with 
>problems that the auto has with RF interference 
>getting  into the circuits.  REASON --  It is 
>cheaper to provide the equipment to fix  the 
>autos that have a problem due to installed 
>communications equipment,  than to install the 
>fix on millions and millions of autos that don't 
>need  it.  SOLUTION -- I always told the 
>customer to check with the dealer to find the 
>proper fix -- it usually took a manager and up 
>the chain to a district manager  for a fix.  And 
>now we have Google and the Internet, which makes 
>finding  these fixes easier.  Of course the new 
>Hybrids have a whole new set of problems 
>and  solutions. Side note -- the diesel and the 
>2007 trip to Dayton:  One would  think a diesel 
>is very quite - no ignition and no electric fan 
>on the  radiator.  Wrong -- the electric 
>injector pump on the 1997 Ford  F350 had 20 over 
>S-9 noise when we put the radio in it.  My F150 
>with  a V6 gas engine has no noise, but it was 
>S-9 noise when just parked next to the  diesel. 
>Google RF noise on the Ford diesel -- there are 
>some solutions. Bob, K5GNA **************Great 
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You never know.

I had a 1978 International Scout Traveler (think 
diesel powered 2-door explorer).  It used a 
6-cylinder Nisan diesel engine with standard 
mechanical rack injector.  I had such a low RF 
noise level that I heard all the noisy vehicles 
passing by on the road.  My current truck is a 
2002 Toyota Tundra, very low audible noise in the 
cabin and no discernable radio noise (the heater 
fan motor is the notible source).

I agree that the manufacturer is a good source 
for noise fixes (more likely a couple years after introduction of a new model).

73, Ed - KL7UW 

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