Hi Richard, Just so we are clear, which application are you using to make JT65 QSO's (WSJT, WSJT-X MAP65) / (HF/VHF/UHF - EME)?
See below for additional comments: On 04/12/2014 03:31 PM, Richard Shaw wrote: > Ok, maybe I'm missing something but I did manage to fumble my way > through a jt65 contact... > > I see the "manual" which has all the technical info but where's the > practical guide to actually performing QSOs? There is one manual for each application. I don't believe there is an abridge version per say. Can you provide us with a link or reference to what your currently using? > > If someone TXs on even, should I respond on odd minutes? Do I need to > respond within the 5+ seconds I have before the next minute? How do I > make sure I'm not stomping on someone else? JT65 (and others) are time structured TX/RX exchanges. They start at 00:00 and run for a full minute (about 45-50 second TX). The time between your decoding of the CQ, and your response, is approximately 10 to 15 seconds, or until 01:00, which starts the RX sequence of the person calling CQ. The only way to determine if someone else is also going to call the CQ station, is to wait one cycle. This is not a guarantee, as you may not be able to copy all stations responding to the CQ station. The best option is to go ahead and respond, then let the CQ station sort out who to work. A full sequence would be (for HF QSO's, VHF/UHF/EME can quite different): I am CQ-ing and You are the responder: 00:00: CQ KI7MT DN46 01:00 KI7MT KF5OIM <GRID> 02:00 KF5OIM KI7MT -05 <-- Only If I copied your station, others may also be answering my CQ. 03:00 KI7MT KF5OIM -05 <-- Send report back if you copied my rpt ok. 04:00 KF5OIM KI7MT RRR <-- Optional CFM 05:00 KI7MT KF5OIM RRR <-- Optional CFM 06:00 KF5OIM KI7MT 73 07:00 KI7MT KF5OIM 73 Start New Sequence: 08:00 CQ KI7MT DN46 You can shorten the sequence to ~4 minutes or so by omitting the RRR steps. I do this when signals / band condx are solid. For rare DX or to ensure you've both copied the signal reports, send RRR to be safe. Start times are important, you should use NTP, D4 or some other application to ensure your computer clock (time) is within +/- 1 second GMT. The larger the time error, the less likely you will be able to decode or be decoded by a CQing station. Hope this helps 73's Greg,KI7MT > Thanks, > Richard > KF5OIM > > > _______________________________________________ > Wsjt-devel mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/wsjt-devel
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