thanks,  I apreciate that, I think I have it now. Doesn't seem perfect but
it seems to work and that is what I wanted.
N1UMJ   John Miller
JEM Racing Seekonk speedway formula-four #3 in need of sponsors to race but
giving it a shot no matter what.
To chat with me, look on aol instant messenger: jemracing3 or ss4mula4 3
----- Original Message -----
From: "Terry Robinson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, January 25, 2001 1:31 AM
Subject: Re: question about artificial ground


> Hi John,
>
> I have one of those here.
>
> The Knob on the left, which doesn't turn continuously, is the sensitivity
> control for the meter;
> The middle Knob switches taps on the coil;
> The right hand knob, which turns continuously, is the variable capacitor.
>
> The wing nut goes to the counterpoise wire whilst the other, which is
> actually a combined 4 mm socket and screw terminal, goes to the earth
screw
> on the ATU or radio.
>
> The thing is a series tuned circuit which, using the counterpoise,
presents
> a low RF impedance at resonance and so effectively sets the ATU, or radio,
> at RF ground.
>
> I had to adapt mine by connecting a jack across the meter so I could use
my
> audio Voltmeter to read it, of course, you're only looking for the peak
> reading, not what the voltage actually is.
>
> One problem I had on mine: The top half turn of the coil is used as part
of
> the wiring, there was a short circuit between this and the top of the coil
> which effectively bypassed the capacitor. This was easily fixed and I
trust
> isn't a common problem, hi!
>
> Hope this helps.
>
> 73,
>
> Terry, G3WUX
>
>
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