[RFI] MFJ 75 amp switcher.

[Dave Harmon]

Indeed!
I've had several very satisfying experiences with Steven Pan.
When it seems impossible to make something happen....Steve makes it happen.

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.

-----Original Message-----
From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
Behalf Of Gary K9GS
Sent: Sunday, March 11, 2012 10:02 AM
To: rfi at contesting.com
Subject: Re: [RFI] MFJ 75 amp switcher.

Hello Jim,

I think the first thing I would do is call Mr. Pan back and ask him if he
would fix the problem.  You might be pleasantly surprised.

This is classic switching PS noise behavior and the first thing to try is
some filtering on the AC input side of the power supply.  I've had very good
luck with filters like these:

http://www.cor.com/Series/RFI.asp



On 3/11/2012 9:17 AM, W4ATK wrote:
> Before purchasing this unit I asked Steven Pan of MFJ if this unit was
quiet. I was assured no problem.
>
> Well I soon noticed a very raunchy signal that moved about the 20 meter
band and eventually settled in about 14.070 MHz. Wonderful, as I enjoy PSK
and the other digital modes.
>
> The strange thing is, I cannot detect the noise if the switcher is on but
not connected to any load. Once I plug it in to the power strip, then the
signal shows up on the P3 panadapter and in the receive audio.
>
> I believe it is being propagated over the power cabling and intend to try
some clamp on ferries. Any other suggestions gratefully received.
>
> Jim, W4ATK
>
>
> Sent from my iPad
>
> _______________________________________________
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> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>

-- 


73,

Gary K9GS

Check out K9NS on the web:  http://www.k9ns.com Greater Milwaukee DX
Association: http://www.gmdxa.org Society of Midwest Contesters:
http://www.w9smc.com

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