[DML] Re: Feedback through CB when engine is running.
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[DML] Re: Feedback through CB when engine is running.

If you hear a whining or a high pitched whir that changes as the
engine speed changes then you have to add filters (capacitors) to the
alternator. If you hear cracks and pops then you have problems with
the ignition wires. You do need to bond (electrically connect) the
ground of the CB antennae to the frame. Not only will this reduce
interference it will give you a lot more range as the entire car cam
become the "Ground Plane". All of the S/S panels and the trim around
the windshield are supposed to be bonded by small wires. You may have
to repair some of them. This is not really "feedback" so much as
intererence created by the motor and picked up by the CB. Get an AM
radio and set it in between stations. You will hear the interference
and can use it like a direction finder to locate the source. The
closer you get the louder it will be. You may also have to add filters
on the power line to the CB radio to reduce the noise on the DC power
to the radio.
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, "Alan  Roberts" <twodelo2@xxxx> wrote:
> Patrick, 
> Your feedback problem is in effect, having isolation between the
antenna ground and the CB ground.  This is complicated in that the
coax from the radio to the antenna is supposed to be for isolation,
keeping the signal going through the cable from being affected by the
signal being radiated from the antenna.  Without a good ground to the
car c

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