[TowerTalk] 40 and 20 at 15 ft apart

[Edward Sylvester]

Anybody using a Steppir with Cushcraft 402CD?  I have this combo with the Steppir at the bottom and the Cushcraft 12' above it.  I had just one opportunity to mount these, as I had a short-term rental on a lift.
 
I decided from the get-go to offset them 90 degrees from one another.  The C/C works as it should, with about 250 KHz of bandwidth and great F/B.  Just thought I would share my experience.
 
For the record, the boom of the CC  is 22' long which is close in resonance to 15m.  Still trying to sort it all out....
 
73,
Ed NI6S

--- On Tue, 8/30/11, Steve London <n2icarrl at gmail.com> wrote:


From: Steve London <n2icarrl at gmail.com>
Subject: Re: [TowerTalk] 40 and 20 at 15 ft apart
To: towertalk at contesting.com
Date: Tuesday, August 30, 2011, 1:06 PM


> The older design tribanders like the KLM KT34's had
> the parasitic elements
> electrically attached to the boom and it is almost impossible to achieve a 
>low interaction regardless
>of height/orientation.

Really ? I have a KT-34XA, a KT-36XA and a KT-34A. All elements are insulated 
from the boom.

You can get surprising interactions. For example, I have a 2 element wire beam 
on 80 meters, supported from, and electrically insulated from a 34' boom, 
attached to the tower. That 34' boom could look a lot like a 20 meter reflector 
to the KT-36XA that is also on the tower.

73,
Steve, N2IC
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