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[RFI] Touch Light Update #2

To: <rfi@contesting.com>
Subject: [RFI] Touch Light Update #2
From: Hare,Ed, W1RFI" <w1rfi@arrl.org (Hare,Ed, W1RFI)
Date: Thu, 21 Jun 2001 16:45:42 -0400
Jon,

Can you post a model number and source? John Phillips, the ARRL Lab's new
RFI engineer, has been testing some of these types of devices to see if they
comply with the conducted emissions limits. I would like to lay hands on one
known to have caused a ham actual interference.

73, 
Ed Hare, W1RFI
ARRL Lab
225 Main St
Newington, CT 06111
Tel: 860-594-0318
Internet: w1rfi@arrl.org
Web: http://www.arrl.org/tis



> -----Original Message-----
> From: Jon Ogden [mailto:jono@enteract.com]
> Sent: Wednesday, June 20, 2001 6:36 PM
> To: rfi@contesting.com
> Subject: [RFI] Touch Light Update #2
> 
> 
> 
> OK all, now for my second touch light update.
> 
> I previously told you that I had gotten my problems with my 
> under cabinet
> touch lighting solved on 10m.  However, I hadn't tested any 
> other bands.
> 
> Well, last night I got on 20m and yes, you guessed it - I got into the
> lights.  Every time I keyed the rig, I would step the lights 
> through their
> settings.
> 
> I already had a large torroid on the AC mains end of things 
> with as many
> turns (over 15) that I could get on it.  This was as close to 
> the control
> box as I could get.
> 
> I tried a small torroid on the sensing line - about 25 turns. 
>  In fact, it
> added so much inductance that it prevented the sense line 
> from working all
> the time.  Still no good.  The radio still got into things.
> 
> I then put torroids on nearly every other cable that is in 
> the whole set up.
> I am STILL getting into the unit.
> 
> I've opened up one of these gems and there isn't much inside. 
>  The case is
> entirely plastic and it doesn't look like there is anything 
> so much as a
> good ground connection to earth anywhere.  Pete, N4ZR, suggested I put
> bypass caps to ground on all the lines.  That is the point I 
> am at.  Short
> of that, I don't have any other solution.  I also wonder if somehow
> shielding all the circuitry may help.  Right now there is 
> none.  Anyone have
> any ideas for adding shielding to a little plastic box?
> 
> 73,
> 
> Jon
> NA9D
> 
> -------------------------------------
> Jon Ogden
> NA9D (ex: KE9NA)
> 
> Member:  ARRL, AMSAT, DXCC, NRA
> 
> http://www.qsl.net/ke9na
> 
> "A life lived in fear is a life half lived."
> 
> 
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