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Smooth Earth Diffraction Calc - RF Cafe Forums
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| nubbage
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Post subject: Smooth Earth Diffraction Calc
Posted: Thu Jan 25, 2007 11:51 am
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 304
Location: London UK
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Hi Yorl
I have a trivial problem to solve but
no budget for suitable software.
Anyone know
a reliable freeware or website with a Java applet
to compute smooth earth diffraction at VHF?
I
am trying to predict performance of a system using
yagi antennas at 160MHz over an 80km smooth path
using -110 dBm sensitivity receivers and 45watts
Tx power with 8 or 10dB gain antennas each end,
low feeder loss.
"Anyone, anyone?"
And
for 5 bonus points, where does that quote come from?
The usual undying devotion to those who can
help.
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Mr.Whatever |
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Post subject:
Posted: Mon Mar 05, 2007 11:23 am
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Joined: Fri Apr 07, 2006
6:10 pm
Posts: 22 |
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nubbage |
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Post subject:
Posted: Tue Mar 06, 2007 6:01 am
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 304
Location: London UK
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Hi Whatever
Thanks a bunch for that link. As
the author says "Information on the subject is very
hard to come by."
I will follow up one of the
references he mentions.
I had not seen this approach
to analysis. It does not appear to be either ITU-R
or NBS, and the author of the paper admits he has
lost the provenance of the procedure.
Thanks
again. It will give me a third approach, and hopefully
narrow down the discrepancy I am experiencing when
using different methods.
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Mr.Whatever |
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Post subject:
Posted: Wed Mar 07, 2007 5:22 pm
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Joined: Fri Apr 07, 2006
6:10 pm
Posts: 22 |
Hi nubbage
If you send me an email at mr[dot]whatever[at]gmail[dot]com,
I can try forwarding you a PDF file that I got.
I'm not sure if it helps, but its worth a try.
Replace [dot] with . and [at] with @ in the
email.
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Posted 11/12/2012
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