[TowerTalk] Interaction potential Hex and 40 m dipole

[Guy Olinger]

On Mon, May 1, 2017 at 6:48 AM Mpridesti via TowerTalk <
towertalk at contesting.com> wrote:

> Any experience here placing a shortened 40 M dipole near and below the Hex
> beam?


Force12 famously kept their x40N series of 40m near full size yagis from
interfering with their XR19, XR31, etc series of 20/15/10 tribanders by
tinkering with the 40m folded element design until the secondary resonances
lay in the WARC bands. That allowed mounting them within six feet on the
same mast in the same direction without discernible effect on the
tribander's pattern.

Without experimentation on the 40m antenna, there is no way to know what
bands may be bothered on the hex beam. Further, unless someone has the
exact same setup as you there is no basis for extrapolating their results
to your situation, particularly since feedline length and whether
non-active coax are grounded or open at the coax switch will also affect
results.

Also note that "unaffected" SWR does not mean the pattern has not been
trashed.

Placing 80 and 40 dipoles/vees 30 feet away is the only way to minimize
interaction with a five band hex beam for sure.

I'm sure that wasn't what you wanted to hear.

73, Guy K2AV





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