Yuri K3BU Said:
If installed over salty marsh. Ever tried to model or compare any vertical
over average and "perfect" sea ground and see the gain at LOW angles?
Thomas KN4LF Says:
Speaking of low angles, when it comes to 160 meter vertical antenna's you
can get a bit of a lower take off angle (TOA) from a full 1/4 wave vertical
or electrical 1/4 wave tee vertical of 10-20 degrees, versus ~30 deg. with
the inverted L. However it's an exercise in futility as the nighttime E
layer MUF blocks 160 meter low angle transmitted radio signals from ever
reaching the F layer to be propagated. So unlike with HF propagation, MF
propagation success does not require the lowest of take off angles to work
DX.
Also higher take off angles of ~30 degrees via the inverted L are better
able to take advantage of the low signal loss E valley-F layer propagation
duct mechanism, a form of Chordal hop propagation.
- -... ...- -,
Thomas F. Giella, KN4LF
Lakeland, FL, USA
kn4lf@earthlink.net
KN4LF SWL & Amateur Radio Autobiography: http://www.kn4lf.com
New Scientific Evidence for the Existence of God:
http://www.cosmicfingerprints.com/audio/newevidence.htm
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