Point well taken!
Lew
deboer@pacbell.net on 04/09/98 09:26:08 AM
Please respond to deboer@pacbell.net
To: mg-t@Autox.Team.Net
cc: (bcc: Lewis Palmer/Notes4/Vanstar)
Subject: Re: Noisy CB in my TD
Nobody has addressed the fact that an uneven commutator, with the
brushes jumping and arcing is often the real problem with generator RF
noise. Simply putting a capacitor on is like putting a bandaid on a big
wound. I usually turned the armature, replaced the brushes AND installed
a capacitor to get a much greater reduction in static.
Cleaning/replacing the rotor & cap also helps, and also keep the cap and
HT wires CLEAN!
BTW: the PLACEMENT of the antenna affects the field strength of the
signal. If you put the antenna on the rear splash apron, @80 % of the
signal will go diagonally to the FRONT. For a simple visualization: just
think of the car body steel as a "magnet" that "pulls" the signal out of
the antenna and sends it on it's way. For maximum loops both fore AND
aft, the antenna should be centered just ahead of the windshield on a T
type. Jarl
ROBERT G. HOWARD wrote:
>
> H Lew,
> I posted my reply to Charlie Palmer before I received yours. These
> messages tend to confirm the theory that it's generator noise as well.
> For example, my CB plugs into the circuit, but I use my Celphone on its
> battery. Cel phone works fine.
> How does one go about determining what capacitors to fit?
> Do you use resistor spark plugs too?
> Does negative ground change the static problem?
> Bob
>
> On Wed, 8 Apr 1998 15:03:03 -0500 lpalmer@vanstar.com writes:
> >
> >I've had similar problems, mostly with a cellular phone - not a CB.
> >The
> >observation of solid copper wires being a problem is definitely a
> >contributing factor is correct. I already have negative ground in the
> >TD,
> >but have had the best luck changing to silicon core resistance plug
> >wires.
> >The only down side of this is that the somewhat lower voltage to the
> >plugs
> >has caused a bit more fouling than normal. This can be mostly overcome
> >with
> >a higher output coil - like the Lucas Sport coil.
> >
> >Also correct is the use of capacitors and any other spark suppressors.
> >Don't overlook a similar capacitor across the generator output. The
> >commutator brushes are another major source of interference.
> >
> >Regards,
> >Lew Palmer
> >32, 50, 59, 72 MGs
> >
> >
> >
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