[RFI] Auto quieting

w6rgs at cox.net w6rgs at cox.net
Sat Oct 3 21:48:40 EDT 2015

The "whine" is usually caused by your 
alternator.  While it can sometimes be faintly 
heard when your alternator's diodes are fine, it 
can get much louder as the diodes fail.  Try 
listening to the noise at the same time you're 
varying the load on the alternator, such as turning your headlights on and off.
Bill W6RGS

At 06:28 PM 10/3/2015, Michael Coslo wrote:
>Good evening all, My mobile installation in my 
>2013 Jeep Patriot went well, and is operating 
>FB. I do have a bit of noise, but something is a 
>little odd about it. Driving along with my foot 
>on the gas, there is a noise like ignition 
>noise, it raises and lowers the number of bursts 
>just like you would expect, but here’s the odd 
>thing. Going downhill, and letting off the gas, 
>the noise diminishes, and then goes away 
>completely, leaving  nothing but ambient band 
>condx. Quietest mobile installation I’ve ever 
>heard. As soon as I hit the gas again, it starts 
>again. Now that’s kind of saying fuel pump to 
>me, but every other vehicle I’ve had, fP noise 
>is a high pitched whine. Anyone have any ideas? -73 de Mike N3LI -

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