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To: rsgb_lf_group@blacksheep.org
Date: Fri, 7 Jul 2006 09:05:06 -0400
Message-ID: <20060707.090507.784.1.CW4EVER4@juno.com>
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From: R obert H Reif <cw4ever4@juno.com>
Subject: Re: LF: Antenna Tuning
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Status: O

You might try un grounding the tower and tieing it to the antenna feed
point.  The grounded tower may be confusing the tuning so give that a
try.  73  Bob  W1XP

On Fri, 7 Jul 2006 03:24:09 -0000 "J. Allen" <vy1ja@northwestel.net>
writes:
> The tower is grounded at its base at this time, but is up on 
> insulators and 
> can be ungrounded easily by disconnecting a 1/0 grounding conductor.
> 
> The vertical portion of the antenna is a piece of coaxial cable 
> spaced about 
> 4 feet away from the tower.
> 
> Still no luck finding the first resonant point. All points have been 
> checked 
> from 20 kHz through 250 kHz.  It acts like I have a big capacitor 
> connected 
> to the end of the coax.  At the base of the antenna, I have 
> installed a 
> relay and can switch between the dummy load and the antenna base 
> loading 
> network.  Whatever is wrong is wrong on the antenna side of that 
> relay.  If 
> the dummy load is put on the other connector it acts as a dummy 
> should, so 
> the problem is not in the relay or its connection.  If I substitute 
> a lumped 
> constant for the antenna, the traces are as expected with the scope.
> 
> I just do not seem to be able to find a resonant point using a 
> frequency 
> divider and tiny amp.  The scope traces are either sine wave traces 
> but with 
> the voltage and current out of phase, or else really convoluted 
> forms which 
> are in phase.
> 
> I am still at step one.   How to I get the two waveforms to coincide 
> and at 
> the same time have them look like sinewaves?
> 
> Any ideas where to go with this now?
> 
> "J" 
> 
> 
> 
>