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Old November 30th 08, 02:24 AM posted to rec.radio.amateur.antenna
Richard Fry Richard Fry is offline
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First recorded activity by RadioBanter: Jun 2006
Posts: 440
Default Low-angle Elevation Gain of a 1/4-wave Vertical Monopole


On Nov 29, 4:51*pm, Roy Lewallen wrote:

Since you can use this method to get results you believe
to be correct, why do you need EZNEC?


Roy:

Don't _you_ believe that the results I posted using the FCC method I
described to be "correct?"

Regardless, and to answer your question -- I don't really need
EZNEC. But it can be interesting to see how various analytic methods
compare.

Quite a few years ago and after due investigation/consideration, I
paid about $300 for the NEC-2 products of one of EZNEC's competitors,
because I preferred its graphical output choices and print quality,
its higher segment limit compared to EZNEC+, and the customization it
allowed in its printed output legends. This capability included the
synthesis and import into the NEC model of any one of many dozens of 2-
D and 3-D structures, to their specific mechanical specifications
defined by the NEC user.

The main reason I use EZNEC occasionally is to investigate the claims
of others who use EZNEC.

Sorry to be blunt , Roy, but then you asked.

RF wrote:
My point when starting this thread was to show that the elevation
pattern radiation actually launched by vertical monopoles on any
frequency does not have a zero/very low relative amplitude at/near the
horizontal plane, which from what I read on these NGs seems to be a
popular belief.


Roy Lewallen responded:
I don't believe I've ever read that. But if anyone does believe it, a
much larger number believe just about the opposite -- that the signal
strength from a vertical is maximum at zero elevation angle at great
distances from the antenna.


?? My reading of these NGs shows that many/most amateur radio
operators ignore/discount the fact that the peak radiation launched by
a vertical monopole of 5/8 lambda or less in height ALWAYS occurs in
the horizontal plane., regardless of the operating frequency, or the r-
f ground in use.

The radiation/reception characteristics at low elevation angles of
such an antenna can be useful in establishing contacts with the most
distant possible single-hop DX sites, can they not?

RF