Ive built the one that was in QST December 1985 as well as Handbooks.
It was built into commercial metal outlet strips for 120V.
For 240V I used #12 wire and a longer rod and duplicated the inductance of
the smaller one. These are built into small Hammond chassis with cover and
are just an IN and OUT.
Ive built about 8 for 120V and 4 for 240V to use at all operating positions.
They work well as numerous family and neighbor complaints were solved plus
less crud in the receivers.
Carl
KM1H
----- Original Message -----
From: "Steve Flood" <kk7uv@bresnan.net>
To: <amps@contesting.com>
Sent: Tuesday, April 01, 2008 7:58 AM
Subject: [Amps] EMI Filtering
>I don't see them used in amp supplies - at least in the various commercial
>or 'handbook' designs I've come across - but are they considered a good
>idea or quite needless?
>
> Followup - when I rewire my shack next month for 230v, I am bringing in a
> 10awg, 4 wire cable (black-black-white-bare) from the service panel to a
> NEMA 14-30 wall socket. (My power supply will have a 120 circuit in it as
> well, so I followed the advice of a previous AMPS topic.) The 230v EMI
> filters I looked at (Qualtek) only have two connectors on the 'load' side.
> What happens to the neutral lead? Does it just 'go past' the EMI filter?
>
> Tnx,
> Steve KK7UV
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>
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