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R: SEC: UNCLASSIFIED - RF breakthrough (was: Conductive paint)




----- Original Message -----
From: Franklin Antonio <antonio@qualcomm.com>
To: Ellis, Peter <Peter.Ellis@cbr.defence.gov.au>
Cc: <amsat-bb@AMSAT.Org>
Sent: Tuesday, February 15, 2000 2:27 AM
Subject: Re: [amsat-bb] SEC: UNCLASSIFIED - RF breakthrough (was: Conductive
paint)

>
>
> .......
>
> In an old ARRL handbook, I saw a related scheme where you put the cable
> thru a cardboard tube from a roll of paper towels, then you stuff the
space
> between the cable and the cardboard with steel wool.  The idea is that the
> RF from the cable is coupled into the steel wool (you've made a
transformer
> where the cable is the primary, and strands of the steel wool are the
> secondaries), then the is dissipated by the resistance of the steel.  I
> have never tried this.  I believe this was proposed as a TVI fix.
>
>

and I think they were rather embarrassed later, when on testing such a
device they found out that steel wool is no substitute for ferrite or iron
powder.

Pesa, IKØHIT

Gabriel Pesarini
ik0hit@amsat.org
pesa@libero.it
PGP available on request



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