JT65 and HF

Julian G4ILO has an interesting post about using W6CQZ’s JT65-HF software.

“One of the features of JT65-HF is that it automatically links in to the PSK Reporter network so you can see all the stations you heard on a map and, even more interestingly, all those that heard you.”

In 20 minutes on 20m at 5W he managed to be heard twice on the west coast of N America under S9 noise condx. Julian says he can understand “why the mode is so popular, even addictive”.

More info on JT65 from HFLINK. “JT65A is a weak signal digital QSO mode.
JT65A is normally used on HF and 6 meter bands.” Also not to be missed are The Complete Bozo’s Guide to HF JT65A (a work in progress) by Andy K3UK and the ‘smart person’s guide’ to the mother mode WSJT.


Prompted by Julian G4ILO’s musings about the possibility of volcanic ash being responsible for propagation he observed a few days back, I’ve been looking deeper into WSPR, the application that produced the data that inspired the notion.

First stop was the main WSJT site where Princeton physicist Joe Taylor K1JT outlines the application along with other weak signal communications applications. The WSPR page points to the 20pp. User’s Guide (pdf).

There’s also some information at the WSPRnet site – especially the stunning map and the detailed database of recent spots.

Map of WSPR contacts
Map of WSPR contacts

Full circle – when I searched for a general introduction to the software and the mode it’s based on – sure enough I end up back with Julian, G4ILO. He’s published a very readable and comprehensive article which quite rightly comes up #4 on a WSPR google search. He describes how easy it is to become part of a global beacon network and contribute to the generation of up-to-the-minute propagation reports.

Right now, I’d really like to know how to interpret the colour and thickness of the lines tracing the transmission paths on the map.

Windows soundcard software

Via the new SDR list heard about RV3APM’s page listing a very wide range of ‘Windows software via Soundcard’. It’s a comprehensive, detailed and at the moment very up-to-date listing.

Also includes handy information about frequencies for different modes, discussion groups and other background info about soundcard modes.

I wonder if there’s a comparable listing of Mac applications… But that’s probably this page!