Another shot, try replacing the speaker lines found to cause the problem(or
all of them) with cat 5 cable. Not really very expensive and it is twisted
pair. Parallel pairs if you need increased wire size for power.
73, de Jim KG0KP
----- Original Message -----
From: "Missouri Guy, N0TT" <n0tt1@juno.com>
To: <giw@bellsouth.net>; <RFI@contesting.com>
Sent: Saturday, August 21, 2004 8:05 PM
Subject: Re: [RFI] RFI to intercom
> Van,
>
> Temporarily disconnecting cables to a few of the stations may
> help isolate some cables that could be resonant to 20m.
>
> I would suggest bypassing the speaker leads right where they enter
> the chassis with some 0.01mfd disk capacitors. Also, check to be sure
> that
> the intercom cables to the various stations are of twisted pair, not
> parallel
> wiring.
>
> Single-point grounding is also important....I don't know the layout of
> the
> MC 602, but assuming that it uses a metal chassis/case, you might
> try grounding the chassis/case if it isn't already grounded.
>
> Try the easy stuff first...go from there.
>
> 73,
> Charlie
> N0TT
>
> On Sat, 21 Aug 2004 13:09:26 -0400 "Van Fair" <giw@bellsouth.net> writes:
> > My next door neighbor has an houswide intercom system that picks up
> > my 20 meter SSB signal and sends it all over his house to 10
> > speakers. The radio in it is turned off but it does have an antenna
> > in the attic. The unit is supposed to be a high end system by M & S
> > in texas model MC 602. The unit cant be turned off as it serves as a
> > door bell and has no off control. I knock him out of bed if I
> > transmit late at night!!! Anyone have any thoughts on how to handle
> > this problem. Neighbor is 100% cooperative and knows it is not my
> > fault. I run 1kw on 20 and it mailnly affects him when I turn my 4
> > El Steppir towards his house. My guess would be that the RF is being
> > picked up on the speaker or AC wires and brought into the amplifier.
> > What can he or I do to the unit to stop this from happening. Thanks
> > Van W4GIW
> > _______________________________________________
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> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
> >
>
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