On 9/1/2022 11:09 AM, Kim Elmore wrote:
I have a KLM KT-34A about 8 ft from and perpendicular to 40CD2. They each
appear unaffected by the other, at least as far as VSWR values go.
I wouldn't expect to see interaction from the elements if they were
perpendicular, but MAYBE from the boom.
An easy way to check for interaction between antennas is to model the
victim as a dipole with the addition of the potentially interfering
antenna as a dipole at the planned spacing, and look for current induced
in the potentially interfering antenna when the victim antenna is driven
at its operating frequency. If there is significant current, I'd start
looking at it's vertical pattern, also varying the lengths of the
interfering antenna to simulate the effect of reflector and directors of
the interfering Yagi.
If interference disturbs the vertical pattern enough to matter, you can
play with spacing until the effect is minimal.
73, Jim K9YC
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