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Re: Re: Inquiry

In this case, there would be cause for concern of a ground-loop circuit.  I
would not want to know that the inside of my passenger compartment would be
considered a better ground than outside the passenger compartment!

OM:  Joel B. Black, KS4AW     XYL:  Kristie H. Black, KF4CHN
Eutaw, AL...............EM62bv     kahblack@mindspring.com
AMSAT member #32589
AO-10, AO-27, FO-20, FO-29

-----Original Message-----
From: Franklin Antonio <antonio@qualcomm.com>
To: GPersons <railfan@flash.net>
Cc: amsat-bb@AMSAT.Org <amsat-bb@AMSAT.Org>
Date: Monday, April 26, 1999 5:09 PM
Subject: Re: [amsat-bb] Re: Inquiry

>At 02:26 PM 4/26/99 , GPersons wrote:
>>Can anybody suggest why they would want to not ground in the passenger
>>compartment? On a vehicle, it would seem to me that a ground is a ground.
>Well I suspect that they fear high currents (RF or DC) which would produce
>voltage drops, and make other systems malfunction.  I don't think it's
>correct to think that "a ground is a ground".  In particular, the various
>pieces of the passenger compartment (especially around the dash) in a
>modern car may be connected together in a complex way, involving plastic
>parts, things that look like wood screws etc.  Some pieces look like metal,
>but are really plated plastic.  Sometimes there aren't even any
>screws.  Sometimes the pieces snap together.  It ain't the construction of
>your daddy's car.  A high R in the ground path turns into a voltage drop
>when current flows thru.
>In addition, there's usually an engine control computer under the dash
>somewhere.  These things often have analog inputs which could easily be
>disrupted by some voltage drops in the ground system.  It ain't the engine
>control system of your daddy's car either.
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