#JT65 FREQUENCIES SOFTWARE#
If it’s off by a second or more, it won’t decode the messages. JT65 relies on the computer’s clock being very accurate. Seeing a waterfall, but nothing being decoded? Joe Taylor K1JT with Essex Ham’s Pete M0PSX JT65 TroubleshootingĪ few bits of information to help with JT65 troubleshooting If there’s any interest, I’m happy to expand this article, but hopefully this tells you what JT65 is all about, and gives you enough to get started.
I found the application Dimension 4 really helps here, as it runs in the background and keeps your clock in-sync by resetting the time to one of the online atomic clock servers every 20 minutes. Computer’s onboard clocks are notorious for drifting off, and you need your clock to be accurate to the precise second, or things don’t work. One key thing I learnt along the way is that your computer’s clock has to be spot on.
Once it’s working though, using the software is fairly straightforward.
#JT65 FREQUENCIES PC#
The software is rather tricky to get set up, and sorting the handshaking between rig and PC was something of a trial-and-error affair. JT65 Alert – A handy application that helps manage your JT65 QSOs.JHB9HXQ – A custom build of JT65-HF with extra features to help you make contact with wanted countries (and also includes an NTP clock sync for keeping the clock correct).JT65-HF by W6CQZ – The main application for JT65 (Also available here: JT65 at Sourceforge).WSJT-X – Written by JT65’s creator Joe K1JT, this also supports JT9 and WSPR.As with WSPR and PSK31, you’ll need some kind of TNC (Terminal Node Controller) to interface between rig and soundcard.
#JT65 FREQUENCIES PLUS#
This is just a summary, plus some notes on what I’ve discovered so far.įirst off, you need to connect your PC to your HF rig.
#JT65 FREQUENCIES FULL#
This is one of the more tricky modes to set up for, and this won’t be a full “how to” guide, as there are plenty of those online already. A screenshot of the PSKReporter website, showing received signals Setting up for JT65 You can also use the great online PSK Reporter website to see where your JT65 CQ calls are reaching, making it great for checking your antenna’s performance. You also don’t need a lot of power to make a contact – you can work the world on 10 watts. It also works many dB below the noise floor, so although you may not be able to hear any signals – they could be there. JT65 handles very weak signals, just like WSPR, so will get through where voice and PSK31 won’t. It’s a case of tuning in to a JT65 frequency, waiting for one-minute transmit cycle to complete, and looking for a CQ message to reply to.
You’ll see from the above screenshot that there is a “waterfall” (as with PSK31) that shows multiple QSOs. One person sends on the odd minute, and the second person sends on the even minute. M0PSX says Reception Report Received (all OK)Įach message of up to 13 characters is sent over the course of 50 seconds, starting at the top of each minute, so the above conversation would take seven minutes. Here is a typical conversation over JT65: “CQ M6PSK JO01” With JT65, you’re restricted to very small messages, with a limit of 13 characters per message. It’s also great for making contact over distance with low power, where a voice signal just can’t make the trip.Īs with modes such as PSK31 and WSPR, you interface your HF rig to a computer, and send out text encoded by your computer over the amateur bands. JT65 is one of the more specialist data modes that I’ve played with, but I must admit, it’s quite addictive.
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