In a message dated 10/13/98 5:21:02 AM GMT Daylight Time, K7LXC@aol.com
writes:
<< Subj: Re: [TowerTalk] 402-CD Spacing with KT-34XA
To: <towertalk@contesting.com>
Date: 10/13/98 5:21:02 AM GMT Daylight Time
From: K7LXC@aol.com
Sender: owner-towertalk@contesting.com
To: k9rz@probe.net, towertalk@contesting.com
In a message dated 98-10-12 21:58:41 EDT, k9rz@probe.net writes:
> I have just completed installing the Cushcraft
> 40-2CD 12 feet up the mast above the top of the tower. I plan on
installing
> the KLM KT-34XA this weekend, right at the top of the tower. With the 12
ft
> spacing, do I need to be concerned enough with interaction between the two
> antennas that I should rotate them 90 degrees apart, or is this spacing
> sufficient to permit them to be aligned in the same direction?
>
Twelve feet is plenty and don't worry about the orientation. Point the
antennas the same way and you'll be fine. The KLM 4L 40M was the antenna that
seemed to suffer degradation that necessitated the 90 degree off-set but the
CC has been fine in all the installations that I'm familiar with.
Cheers, Steve K7LXC
>>
For what it's worth, I just put up an XM240 eleven feet above a Hy Gain 204BA
which has a shorter boom than your KT34XA. There was definitely a change in
SWR from having the 2L40 alone on the tower to when the 204BA was added. Both
antennas are oriented the same direction. This tells me that there IS SOME
interaction. The question is whether it is enough to really diminish the
performance of either antenna.
It would be interesting if someone modeled this with a program that could
handle stacking. I'm sure it has been done by someone here on the TT
reflector...
Anybody done this who would care to share the results??
73,
Will
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