[RTTY] HF Channel Simulators
Kok Chen
chen at mac.com
Wed Feb 8 18:59:02 PST 2012
For those interested in using HF Channel Simulators to test their modems, the ITU has apparently made many of their documentation free for downloading. This includes ITU-R F.1487 "Testing of HF Modems with Bandwidths of Up to 12 kHz using ionospheric channel simulators."
This is the document that has the Watterson parameters for many standard propagation conditions, such as "Mid-Latitude Disturbed Condition," etc. Both PathSim and cocoaPath accept Watterson parameters. All the ITU-R F.1487 propagation profiles are built into cocoaPath.
It used to cost Euro 25 (at least that was what it'd cost when I got my copy a couple of years ago), but is now completely free at
http://www.itu.int/rec/R-REC-F.1487/en
Many other interesting ITU documents for the Fixed Service section are equally free and listed here
http://www.itu.int/rec/R-REC-F/en
The propagation section at http://www.itu.int/rec/R-REC-P/en includes recommendations like P.533 ("Method for the prediction of the performance of HF circuits").
There are tons of good stuff in the archive, and now they are free to peons like us.
73
Chen, W7AY
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