[RFI] Mobile amps and vehicle issues

[FoMoCo EMC]

The Crown Vics for police duty do have a number of differences in them for 
safety, convenience of mounting police accessories, and they are required to 
protect for radio reception in the radio bands above 30 MHz.

Performance below 30 MHz isn't any better because of the police package.  
There is a big difference 20 meter amateur reception and public service 
VHF/UHF reception.  The two services are separated by an order of magnitude 
in frequency with the amateur radio service HF stuff that much closer to the 
ignition noise and pulse width modulated signals (frequency-wise).  There is 
also the difference in signal levels and modes with the public service radio 
generally having higher received signal levels and being FM which is more 
immune to noise.

Good radio performance above 30 MHz doesn't guarantee good performance below 
30 MHz.

EMC


>From: "N6KI Dennis" <n6ki at juno.com>
>To: fomoco_emc at hotmail.com
>CC: rfi at contesting.com
>Subject: Re: [RFI] Mobile amps and vehicle issues
>Date: Thu, 12 Jan 2006 08:35:23 GMT
>
>Hmmmmm...maybe I missed somrthing here.
>
>Don't most Police Depts buy American cars, like especially
>the Ford Crown Vics etc and what do they get when they buy
>the "police special" since they have deal with commo gear
>to be installed or is it not a problem at the freqs the
>police and other service vehicles use.
>
>73, Dennis N6KI
>
>
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