Monday, November 14, 2011

JT65A, propagation and data visualisation

When I met Dave WW2R/G4FRE back in the spring he mentioned that after you've played with JT65A on HF you really don't want to do HF any other way. Having had a good weekend playing with the mode, I'm inclined to agree! Of course there are provisos - this is a mode to make bare bones contacts with minimal power or poor propagation. It's certainly not a mode for chatting!

Having said that, I have loved having the receiver running all day hooked up to the wonderful JT65A-HF program from W6CQZ with the data being uploaded to both the Reverse Beacon Network and the PSK Reporter network

The other thing about this is that when you call CQ or work someone, you can readily see who else heard you, which is absolutely fascinating.

Over the weekend I think my signals have been heard in all continents on 28MHz running anywhere between 10 and about 50 watts (depending on conditions) to the vertical. I have had some fascinating contacts and found some interesting openings.

Mike M0PRL is interested in visualising propagation data to look for openings and he kindly put together a fascinating time lapse sequence of the stations that my JT65A receiver hears over a period of 24 hours (though I confess it's usually switched off overnight, as you will see). Congratulations Mike, this is a really great visualisation!



PE4BAS, Bas said...

Nice vizualisation though a little blurred. But with some imagination you can see the propagation move from east to west. I like JT65A as well and had some amazing QSOs with it. But still like SSB as well on HF. 73, Bas

Tim said...

Hi Bas. The original video that Mike sent was very sharp. Not quite sure why the upload has made it blurry. I will have to see if I can sort that out.

m0prl said...

It does seem to have got a bit mangled! I've uploaded the video directly to Youtube at

It's still not quite as sharp as the original, but it's not too bad, especially fullscreen at max quality.

VE3WDM said...

morning Tim, I have heard a lot about JT65 and this weekend I should be giving it a shot. I ordered the Sigalink USB and it should be here sometime this week I hope. It is very nice to be able to see where else your signal has been heard. I will be operating at about 5 or less watts.


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