"John - KD5YI" wrote
Are the formulae used in this program approximate and perhaps do not
apply
in circumstances in which you have no time (at this time in your
life) to
tell the "secrets" about? Without source code, it is difficult to
"read
between the lines".

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John, just for your benefit I have uploaded the source code of program
PROPGATE to my website. You will find it available from "Download
source code from here".

I hope you are able to make sense of it. Please let me know.
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Reg, G4FGQ