[amsat-bb] SEC: UNCLASSIFIED - RF breakthrough (was: Conductive paint)

["Ellis, Peter" <Peter.Ellis@xxxxxxxxxxxxxxxxxx>]

Another interference situation is the home intercom / internal communication
systems - those things that allow each room to talk to every other room plus
the doorbell, the laundry chute, the pool pump, etc. 

A friend has INTENSE breakthrough from HF onto his home intercom. 
He can only operate when everyone else leaves the house. 

Any suggested fixes out there?
((Thanks, Franklin. I note the suggestions about ferrites...))

Peter R. Ellis, VK1KEP
peter.ellis@cbr.defence.gov.au

		-----Original Message-----
		From:	Roy Welch [mailto:rdwelch@swbell.net]
		Sent:	Monday, 14 February 2000 16:58
		To:	amsat-bb@AMSAT.Org
		Subject:	[amsat-bb] Conductive paint

		Hi Fellows,

		Does anyone know of a source for electrically conductive
paint?  For
		sometime I have had the annoying problem of RF getting into
my PC
		speakers.  Every time the radios key up there is a healthy
thump from the
		speakers depending on the antenna orientation.  I have
completely filtered
		all inputs to the small speaker amplifier in one of the
speaker cabinets
		with no appearent improvement.  Since then I temporarily
used some foil
		inside the speaker cabinet and this had considerable success
in getting rid
		of the RF.  So the RF is being directly radiated into the
amplifier,
		bypassing the filtering on the inputs.  I want to get some
conductive paint
		and paint the insides of the speaker cabinet to provide the
shielding.  I
		have looked into adhesive copper foil, but the inside of the
cabinet is
		difficult to get into with the foil.

		Thanks.

		-- 
		73, Roy

		Internet: w0sl@amsat.org
		Home Page: http://home.swbell.net/rdwelch
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