[TowerTalk] 40 and 20 at 15 ft apart
ROBERT HARMON
k6uj at pacbell.net
Tue Aug 30 17:02:46 PDT 2011
Steve,
You are correct, I had it backwards. The KLM antennas have the elements insulated from the boom,
and Force 12 parasitic elements are connected to the boom. Thanks for pointing it out.
Yeah, interactions are intriguing. I have an 80 meter Waller Flag strung up to help
with nulling out some local power line noise on 80. At first the pattern was awful but now
is pretty good with a deep null towards the noise. Discovered that my tower was acting as an
antenna on 80 and throwing the Flag pattern way off. Also discovered my neighbors guy wires
to his old TV antenna were also enjoying being resonant on 80, hihi. I resolved the tower
resonance and my neighbor was kind enough to let me add some insulators to his guy wires
which remedied the situation.
Bob
K6UJ
On Aug 30, 2011, at 1:06 PM, Steve London wrote:
>> 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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