Smooth Earth Diffraction Calc

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Smooth Earth Diffraction Calc - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

nubbage

Post subject: Smooth Earth Diffraction Calc

Posted: Thu Jan 25, 2007 11:51 am

General

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 304
Location: London UK

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.

Mr.Whatever

Post subject:

Posted: Mon Mar 05, 2007 11:23 am

Captain

Joined: Fri Apr 07, 2006 6:10 pm
Posts: 22

I found this interesting article:
http://www.nor.com.au/community/sarc/re ... ateurs.pdf

I hope this helps. :-)

nubbage

Post subject:

Posted: Tue Mar 06, 2007 6:01 am

General

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 304
Location: London UK

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.

Mr.Whatever

Post subject:

Posted: Wed Mar 07, 2007 5:22 pm

Captain

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.

Posted 11/12/2012

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