One measure of a transmit antenna's performance is how loud the signal from
it is at some distance away. In addition to the RBN, a WSPRlite Classic
Antenna Performance Analysis System from SOTABEAMS is great for determining
that. It can be used to compare transmit antennas at the same location, or
how your antenna compares to an antenna at another location.
73,
Marsh, KA5M
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim
Brown
Sent: Sunday, October 1, 2017 10:16 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fan Dipole
On 10/1/2017 5:26 PM, Wes Stewart wrote:
> It's a hobby . We get to choose our own metrics.
We can certainly decide what's important to us, but Mother Nature will
decide how things work.
> Did you compare your antennas on a calibrated range operated by
> skilled people?
There are other good ways to evaluate (or at least compare) antenna
performance. 1) Skilled contesters can get a pretty good idea about how one
antenna compares to another by using both in a contest.
2) The Reverse Beacon Network can be used to compare two antennas simply by
transmitting into both at the same time using different callsigns, then
averaging and analyzing a very large number of signal reports over a long
test interval.
3) Carefully constructed models are generally pretty good if rules for the
modeling method are followed and the model accurately describes the antenna
and considers other variables like soil and surrounding objects.
A few years ago, W6GJB and I found very good correlation between #2 and
#3 (using NEC2) comparing an 80M inverted vee with apeax at 44 ft with a
70 ft vertical that was center fed with top and bottom loading.
73, Jim K9YC
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