Thanks, Stan.
Well, the dipoles are purposely short ... only 10 feet long ... and
since they aren't even close to being resonant at 15 MHz the idea was
that any coupling would be minimal. I modeled broadside dipoles using
EZNEC and the results for phase difference versus elevation tracked the
separately calculated values literally to a couple of tenths of a
degree, so that showed no coupling effects.
Besides, the test run I did with the drone didn't show any obvious
coupling effects that I could discern. The ground effects seemed far
greater.
And while end-to-end dipoles would probably work OK (although I think
verticals would be better) for azimuth, I don't think they would work as
well for elevation. In any case, I don't have the structures available
to point a rope at WWV.
73,
Dave AB7E
On 4/10/2026 3:51 AM, Stan Stockton wrote:
Very impressive work, Dave! Doesn’t matter if AI wrote the code. You were the
brains behind it.
When I first read your post I thought perhaps you were going to use a couple of
dipoles end to end with rope between them for the antenna and was surprised to
see the dipoles on a boom. Would that not present some problem with the
coupling between those dipoles in the same plane with one behind the other?
73…Stan, K5GO
On Apr 10, 2026, at 2:11 AM, David Gilbert via TowerTalk
<towertalk@contesting.com> wrote:
Not too long ago I mentioned that I was working on a application that would
hopefully measure and display the arrival angle of an RF signal by feeding the
audio from two phase locked receivers into the sound card of a computer and
doing the processing on a browser web page. The application is now functional
and I have created a YouTube video describing what I tried to do, how the
application works, and to what degree I was successful. At 50 minutes it's
pretty long so if you decide to watch it you might want to click on the YouTube
settings icon at the lower right to speed it up. My production skills are
limited so please take that into account.
The YouTube video is here:
https://youtu.be/MxRaYSRMPE4
The actual application is here:
http://www.ab7e.com/ArrivalAngle.html
You can run the app directly from my web page but you can also just download it
(right-click, save page as .html) and run it locally on your own computer.
It's totally free and comes with no guarantees of literally anything.
I'd appreciate any comments or suggestions, and I'll try to answer questions.
73,
Dave AB7E
p.s. The application was written by OpenAI's Codex coding agent. I created
the layout and the prompts that specified how it should work, and I did a lot
of refining, but I didn't write a single byte of the actual code. We're in a
new era of custom software for almost any use no matter how limited the
audience may be for it.
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