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[RFI] Neon signs?

To: <rfi@contesting.com>
Subject: [RFI] Neon signs?
From: EDWARDS, EDDIE J" <eedwards@oppd.com (EDWARDS, EDDIE J)
Date: Tue, 11 Jan 2000 10:25:11 -0600
Okay, I should've looked this up first!  

The ARRL's "RFI: How 2 find it & fix it" book has a fix for Neon signs and
it's not ferrites!  The ARRL's RFI books are excellent resources for many
EMI problems.  I highly recommended that everyone add one to your library.

The fix calls for an AC Line filter mtd directly at the sign's transformer,
and also resistors (10-Kohm, 1-W) in series with each high voltage lead to
the sign.  Also, they mention ensuring a good ground connection for the
transformer case.  This is probably missing in many installations.  A 3-to-2
prong adapter, if used, would eliminate the needed ground.  

Lastly they suggest for tough cases: try winding thin magnet wire around the
neon tube along it's entire length (6 or 7 turns per foot) and ground at
each end.  

An electrician should probably do most if not all of the above work
(especialy that last one!).

73, de ed -K0iL

> -----Original Message-----
> From: EDWARDS, EDDIE J [SMTP:eedwards@oppd.com]
> I don't have any experience with neon signs.  I'd start by contacting the
> owners and find out who is the manufacturer of the signs.  Then try
> calling
> the mfr for some help.  They may have a fix they can send out to the shops
> using their signs.

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