[TowerTalk] Monoband Yagi stacking heights

[Jim Reisert]

At 10:04 AM 10/15/00 -0600, n4kg@juno.com wrote:
 >More comments below.  N4KG
 >
 >On Sat, 14 Oct 2000  Pete Smith <n4zr@contesting.com> writes:
 >>
 >> At 07:47 AM 10/14/00 -0600, n4kg@juno.com wrote:
 >> ...
 >> >Coverage of high angles drops off 3 degrees
 >> >for each 1 degree you pick up with increasing
 >> >height which means that the higher you go
 >> >the LESS coverage you have.  For the really
 >> >low angles, I like 120 ft for the high bands.
 >> >At this height, the SECOND lobe is also
 >> >at useful waveangles for daytime propagation.
 >> >Fill in the hole with another antenna at 40 to 60 ft.
 >>
 >> I think this generalization is maybe a little too general, and much
 >> truer for the lower high bands than for 10m.  Just as an example,
 >> my C-3E  at 100 ft. on 28 mHz shows lobes at 40, 26, 16 and 5
 >> degrees, with the  highest angle lobe only 4 dB down from the
 >> lowest.  By contrast, on 20m the  same antenna has forward lobes
 >> at 10 and 32 degrees, with the high-angle  one only 1.42 dB down.
 >
 >> The big problem here is the deep null between  the two lobes,
 >> right where you might need gain to run Europeans in the
 >> afternoon.
 >>
 >> 73, Pete Smith N4ZR
 >>
 >
 >EXACTLY my point.  I have been preaching that a LOW
 >antenna is best for Europe and Africa on ALL of the high
 >bands during mid-day for the last 20 years.

But this is exactly where I'm differing with you, Tom.  I think your
statement is much truer on 20 than on 10 meters, at least to Europe.

It's clear from modeling that the North-South path from the States is a
very different creature.  You can see some decent propagation modes from
Argentine to the Eastern US at angles in the 30-35 degree range, far higher
than anything that happens to Europe.  Of course, ionization is much higher
over the equator than anywhere else, on average.

73, Pete Smith N4ZR

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