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VK5QX > PROPAG 06.12.03 13:58l 77 Lines 2681 Bytes #999 (0) @ WW
BID : E60767VK5QX
Read: GUEST OE5EWL
Subj: GREAT CIRCLE MAPS
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0BEL<SP7MGD<VK3KAY<VK6HGR<VK5UJ<VK5BRC<
VK5SPG<VK5LZ
Sent: 031205/0519Z @:VK5LZ.#ADL.#SA.AUS.OC #:9152 [Elizabeth] $:E60767VK5QX
From: VK5QX@VK5LZ.#ADL.#SA.AUS.OC
To : PROPAG@WW
THE EASY WAY TO GO.
It is a very simple matter to determine such things as long and short path
distances as well as forward and reciprocal bearings.
I do have a very high quality Great Circle map centred on a location just
a few kilometres from my home QTH, however, it is not always easy to
obtain a readily available map of this nature.
There are easy ways to determine such information, PLUS A WHOLE LOT MORE.
I suggest to you that you use the internet to download a copy of the FREE
(public domain) program "W6ELProp" Version 2.70 by Sheldon C. Shallon
W6EL.
Simply use your search engine to find the "W6ELProp" program and you can
download it in no more than just a minute or so.
This excellent program allows you to derive ionospheric predictions for
frequencies between 3 and 30 MHz.
It also allows you to display these predictions on screen or print the
propagation forecast diagrams for both long and short paths.
Details of both long and short path distances are also displayed in either
"kilometres", "nautical miles", or statute "(US) miles."
One very interesting facet of the program is its ability to display, and
allow a print out of, the great circle map for whichever particular path
between locations that you decide to choose.
You can also print out a simple great circle map for use as a general
purpose operating aid.
All you need is to enter the relevant longitude and latitude for the
respective terminal locations. You can, in fact, utilise the available
facility of a list of prefixes if you so desire.
To extract propagation prediction information, MUF's and OWF's etc. you
must enter either the current "K Index" or "Solar Index" figures.
A variety of other maps, as well as a table of short path bearings from
your QTH to other prefixes, can also be printed.
Another feature is that you can determine anticipated signal levels, in
decibels above 0.5 microvolts OR signal to noise ratios in decibels.
As indicated above, this very handy program is available at no charge.
I can highly recommend the "W6ELProp" program as being useful from quite
a few different points of view.
The graphics are quite well done and it is simple to use.
Other propagation programs, such as "Miniprop", will provide you with
details such as path distances etc. There are also a number of more
sophisticated propagation prediction programs available, at a cost.
However, I find that "W6ELProp" meets practically all my needs in this
area of interest.
I hope that this information will also be of use to you.
Regards,
Ian
__________
73 de Ian, VK5QX
@ VK5LZ.#ADL.#SA.AUS.OC
05 December 2003
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