David,

I did use one of these in the late 80's  at my old QTH where the shack was 
on the second floor.  It really did work.   It has a large tapped inductor 
and variable cap in the box.   I think the idea is to tune out the 
inductance in a long ground lead.   I was pleased with the results.

73, Steve KW3A


----- Original Message ----- 
From: "David W Wood" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, June 06, 2007 12:00 PM
Subject: Re: RFI problem.


> Hi all:
> I acknowledge the antipathetic view toward MFJ stated on list of late.
> However, I am told that the MFJ artificial earth works reasonably well.
>
> David
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Butch Bussen
> Sent: 06 June 2007 15:59
> To: [log in to unmask]
> Subject: Re: RFI problem.
>
> Yep, grounding is strange.  I'd try ungrounding stuff and see if that
> helps.  I was trying one of those clear speech speakers a friend had here
> once and when I hooked it up to my main power supply, I almost blew the
> thing off of the desk when I hit the ptt.  I grabbed a little 12v wall
> wart and used that instead for the speaker, and was clear as a bell.  You
> just have to try stuff.
>
> One trick I saw a ham use years ago, and yes, it does work, for a long
> ground run take a piece of coax using the center conductor for your ground
> wire.  Bypass each end to the braid with a .01 cap.  I don't know why, but
> keeps the ground from radiating as an antenna.
> 73s
> Butch Bussen
> wa0vjr
>
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