John --
In addition to being able to obtain a great circle map set at your
location, the STARTING and ENDING boundaries of the grey line can be set to
any value. I have set mine so that the gray line:
-- starts when the sunrise/sunset line hits the atmosphere at the height
of the D layer...
-- ends where the sunrise/sunset line contacts the height of the F-layer.
This has an additional advantage over traditional gray line displays,
since it illustrates, at sunset:
.. when the sun stops illuminating the D layer, and absorption starts to
decline
.. when the sun stops illuminating the F layer, and ionization starts to
decrease more rapidly.
The inverse is indicated in the sunrise portion.
When one examines the path a great circle radio signal takes through
this grey line, it becomes much easier to see when signals will peak on the
low bands (low absorption, some F layer illumination occuring).
-- Eric
At 03:31 PM 1/16/98 -0500, John Warren wrote:
>Bob N8YGG wrote:
>
> |Go to the home page of GeoClock, they offer both a shareware and a
> |pay for version that are great. It includes a screen saver also.
> |I'm currently running the shareware version under both 3.1 and 95
> |and it handles both with no problem. They also offer a ham version
> |to buy. Their web site is at:
> |
> |http://www.clark.net/pub/bblake/geoclock/
>
>But the gray line is not plotted on to a great circle map for your
>location. That's what is REALLY needed to understand propagation. Don't
>think that exists however, certainly not in real-time software (either MAC
>or Windows).
>
>John, NT5C.
>
>
>
>
>--
>CQ-Contest on WWW: http://www.contesting.com/_cq-contest/
>Administrative requests: cq-contest-REQUEST@contesting.com
>
>
-- Eric K3NA
scace@uu.net
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