Thread: HF is Smokin
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Old May 3rd 12, 05:13 PM posted to rec.radio.amateur.antenna
[email protected] jimp@specsol.spam.sux.com is offline
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First recorded activity by RadioBanter: Jun 2006
Posts: 1,898
Default HF is Smokin
wrote:
On 3 May,
wrote:

The next modification will likely be finding a 10 M trap at a swap meet
and installing it at about 5/8 wavelengths to push the 10 M lobe down.

Why not put a quarter wave stub for 10metres about half wave down from the
top to make it radiate as two half waves in phase on 10? That would also
guive a little loading on the more LF bands increasing efficency slightly.
I'm not sure without checking what the effect on the bands below 20 would be.

Mostly because of the mechanical complexity of doing that and the winds
here can exceed 60 MPH.

Inserting a trap is much simpler and catches less wind.



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