Ed,
Not the one in the handbook ?
73 de Gary, AA2IZ
----- Original Message -----
From: "Hare,Ed, W1RFI" <w1rfi@arrl.org>
To: <tentec@contesting.com>
Sent: Thursday, June 12, 2003 10:59 AM
Subject: RE: [TenTec] RFI update
> My best stab at switcher noise would be to try a "brute-force" AC line
filter. Radio Shack catalog 15-1111 may help.
>
> 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
>
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>
>
> > -----Original Message-----
> > From: Kevin J. Rowett [mailto:krowett@rowett.org]
> > Sent: Wednesday, June 11, 2003 11:18 AM
> > To: tentec@contesting.com
> > Subject: RE: [TenTec] RFI update
> >
> >
> > Switching power supplies tend to put out broadband noise from
> > about 150kHz
> > to
> > approximately 5MHz. Any number of design errors can cause
> > this - recovery
> > diodes
> > breaking down as they switch, high/low MOSFETs both on at the
> > same time for
> > an instant,
> > poor PCB layout.
> >
> > Copper tape, and ferrite beads are about the only cure.
> >
> > N6RCE
> >
> >
> > -----Original Message-----
> > From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]
> On Behalf Of wb5jnc@juno.com
> Sent: Wednesday, June 11, 2003 7:52 AM
> To: tentec@contesting.com
> Subject: [TenTec] RFI update
>
>
>
> Greetings all,
>
> About a month ago I posted a message about an intermittent RFI problem on
> the AM BC band and 160M (which shows up spaced at approximately 138 KHz
> intervals). I had continued to try to track it down as time/WX permitted
and
> had narrowed it down to my house and the neighbor behind me. Yesterday the
> neighbor's jr. op was out mowing the lawn so I went over and talked to him
> after he finished. It turns out that he came home from college about the
> time the RFI started. He brought his clone computer home that they had
> bought for him last fall when he went off to school and started using it
> here. I have checked from their QTH and the RFI seems to disappear
> completely with unplugging it -- now I need to get on the landline with
him
> and check from my QTH. I had him unplug it as a secondary test because
when
> it was on it _completely_ wiped out the AM radio in the hall outside his
> room with broadband noise! (BTW the computer is an "Alaska" brand: PS says
> "Made in China" as to be expecte!
> d.)
>
> Does this sound like it could be the culprit, and if so, what's the best
way
> to get it resolved? (The family is very cooperative and the system is less
> than 1 yr. old, so the question would seem to come down to whether the
> dealer or the manufacturer is responsible if I can prove that this system
is
> the source of the RFI.)
>
> TNX/73, Al
>
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