Towertalk
[Top] [All Lists]

[TowerTalk] Stacked tri-banders vs. Single mono-banders

To: <towertalk@contesting.com>
Subject: [TowerTalk] Stacked tri-banders vs. Single mono-banders
From: n4zr@contesting.com (Pete Smith)
Date: Sun, 25 Jan 1998 19:10:17
I've been toying with adding a second C-3 at 69 feet to my current one at
97 feet.  The 2-stack appears from modeling to be pretty decent for 20 and
15, but leave a lot to be desired on 10, given the over-wide spacing.  Do
the assembled antenna wizards have any opinions on the idea of adding a 3
or 4-element 10-meter yagi halfway between the two tribanders?  If I
understand things correctly, I would need to have odd 1/4 wave multiples of
feedline from the common feed point (UNUN box, presumably) to ensure that
all 3 antennas would get equal current on 10, despite their dissimilarity.
I'd also try to make the 3 driven elements line up with each other, more or
less, to mibnimize phasing errors from that source.  On 15 and 20, the
10-meter antenna would be effectively disconnected, of course, but with the
two C-3s my hope is that feedpoint currents will be similar even if I can't
follow the 1/4 wave rule for them.  Right/wrong?

Any opinions, caveats, things to avoid?




73, Pete Smith N4ZR
n4zr@contesting.com 

"That's WEST Virginia.  Thanks and 73"

--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search

<Prev in Thread] Current Thread [Next in Thread>