What a funny old thing...the dipole wins again!
p.s., excuse my ignorance, but wht does <g> represent???
David
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----- Original Message -----
From: "John O. Newell" <jnewell@...>
To: <FT817@...>
Sent: Thursday, June 14, 2001 12:44 PM
Subject: Re: [FT817] Re: NVIS Saturday afternoon test
I think most of your answers would be answered in Feilder's and
Farmer's book "Near Vertical Incidence Skywave Communications --
Theory, Techniques and Validation". I highly recommend it.
Jim --
Yes, I think we will continue experimenting!
Thanks for the reminder. In fact, I have a copy of the book
you mentioned, but it had slipped far down in the reading
pile. I skimmed it, quite late last night, and will start
reading it. It looks very good. Among the points I noticed
skimming last night...
- the author says that, based on reports from many stations
over a number of years, low power stations can confidently
expect to succeed with NVIS; the rub is that "low power" is
400w <g> and he says operators of 20w backpack radios often
have great difficulty...
- the AS2259-type antenna that Keith N1XTK and I were using
does indeed, as I had recalled, rate pretty low compared to
other types
- the author(s) suggest that the best antenna for NVIS may
in fact be ye goode olde dipole (or , if the angle is not
too great, an inverted Vee) at low fractions to the ground,
possibly with a reflector below at a measured distance.
If you compare my main antenna to their recommendations, on
40 and 80 it pretty much fills the bill (with the exception
of the reflector element). This reminds me of an
observation in an article I read recently on NVIS for packet
radio, in which someone was quoted as saying that there are
a whole lot more NVIS antennas out there than most people
suppose!
So, more to read -- this book looks like an engaging and
profitable read, so thanks to Jim VE3XJ!
73
John Newell
KB1FPM
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