ka3jjz
Wiki Admin Emeritus
Those of you that subscribe to MT and got the June issue saw an article on stations that, although heavily encrypted, are being watched by the well known ENIGMA 2000 numbers monitoring group. In that article, Hugh Stegman mentioned a freeware package (Sigmira) that evidently can copy STANAG 4285, which is a mode known to be used by NATO forces. To the best of my knowledge, the only packages that can copy this mode are the ones made by Wavecom and (I think) Skysweeper.
Anyway I went to the website listed in the article (the software is designed to be used with SDR radios, but from the description and article, works with other receivers too) which is supposed to decode this mode, only to find the URL is incorrect as listed (at least under Firefox). Remove the 'index.html' from the lowest node, and it works. Here's the corrected one...
Sigmira
We've long known there are many 'uncopyable' RTTY-like (or multitone) signals out there - this just adds a little piece to the puzzle, thanks to this article. 73 Mike
Anyway I went to the website listed in the article (the software is designed to be used with SDR radios, but from the description and article, works with other receivers too) which is supposed to decode this mode, only to find the URL is incorrect as listed (at least under Firefox). Remove the 'index.html' from the lowest node, and it works. Here's the corrected one...
Sigmira
We've long known there are many 'uncopyable' RTTY-like (or multitone) signals out there - this just adds a little piece to the puzzle, thanks to this article. 73 Mike