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Re: Arrow Mod



Hi David

Ooops... I tried something similar to what you tried, anyway! I hadn't read
your mail properly. I didn't note that you wanted to put _all_ the elements
onto one boom. I'd guess that following my previous experiment you'd have
enormous problems tuning due to coupling, not to mention a potentially
appalling radiation pattern.

If I had the patience to learn those NEC programs I'd give it a go!

Add to my previous note, that I tried briefly using two dual band yagis on
one boom in an X config. It was 5 ele on 2m and 9 ele on 70cm (so 10 on 2
and 18 on 70 in total). The original antenna had both 2 and 70 elements in
the same plane, so I though this would be easy.

Again another failure. My history of antenna failures is long, but I still
try. Unsuccessfully usually.

73 Howard G6LVB

----- Original Message -----
From: "David M. Tipton, PhD" <tiptond@psi.com>
To: <amsat-bb@AMSAT.Org>
Sent: Sunday, October 15, 2000 6:30 PM
Subject: [amsat-bb] Arrow Mod


> I was sitting here this morning wondering if it would be possible to
> convert the Arrow design into 2 CP yagis on the one boom.  Could the
> additional elements be offset by 45 degrees?  Thus making it a 6 Element
CP
> Antenna on 2M with elements at 0/90/180/270 Degrees and 14 Elements on
70cm
> at 45/135/225/315 Degrees?
>
> I'm simply thinking about camera/tripod use.  This would provide a heavy
> (But not unwieldy) Mode J Antenna that would just about be the ideal for
> portable applications.  Would this be enough seperation, or would it cause
> too many problems?
>
> Dave, N8KXA
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>

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