Re: Two Band Moxon/wire beam

Posted by Charles Greene-2 on Oct 03, 2005; 4:34pm
URL: http://elecraft.85.s1.nabble.com/Two-Band-Moxon-wire-beam-tp382311p382319.html

Gil,

It performed well during our special event this weekend.  We had it
up at an average height of 25'.  We used it on both 20 and 40 meters
simultaneously using Array Solutions RF filters with a little 2nd
harmonics or phase noise on 20 from the 40 meter transmitter.  We
were able to reduce this interference about 18 dB using a shorted
coax stub on the 40 meter feed line.  The resonant frequency is 3 to
5% low from the design value, which turn out to be caused by my not
taking into account the velocity factor of the insulated wire I used
for elements.  Hopefully, we will get everything corrected for field day.

Chas, W1CG

At 09:38 AM 10/3/2005, Gil Stacy wrote:

>Hi Charles,
>
>The trimming technique of W1AX looks like a well-thought out
>approach to solving the idiosyncracies of location diffferences in
>erecting the antenna.  I've always been impressed by the Moxon
>technology in using wire to erect a simple gain antenna.  I emailed
>W1ZY about his switchable 40 meter Moxon and never heard back.  The
>sound file of his front and back switching is very impressive.  I
>suppose he had a lot of "cutting and trying" to perfect it as well
>as more relays than one can imagine.  Let us all know how your
>antenna performs.
>
>73, Gil NN4CW
>

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