Hi Reino, Belt and suspenders - WSPR is the belt and would be the primary tracking source providing, location and encoded in the power field altitude in some transmsissions, and temperature in others; FT8 would be the suspenders as a secondary mode and just provide a position using a four character grid square to supplement the WSPR transmissions of provide fills whenever they may not be any WSPR reports.
The basic premise is the use of crowd sourced reception reports by the world wide users of FT8 and WSPR. WSPR of course uploads reception reports to wsprnet.org. WSJT-X uploads FT8 reports to pskreporter.info but only for those CQ <CALL> <GIRD> messages - as far as I know something like VE3GHM FN25 (without the CQ) would not get uploaded by WSJT-X to pskreporter.info. these pico balloon tracker are transmitting approximately 5mW at best. At the moment I have a very simple beacon transmitting FT8 that hops around on 80/40/30 and 20m sending a CQ once a minute on each band at 5mW. The actual transmit frequency within the FT8 sub band is randomized as well. All based on an Arduiono UNO and a QRP Labs si5351a synthesizer. That 5mW does surprisingly well for a pip squeak signal on very busy and active FT8 frequencies. This will show what other stations have copied my transmissions over the past 24 hours: https://pskreporter.info/pskmap.html?preset&callsign=ve3ghm&txrx=tx&mode=FT8&timerange=86400&hideunrec=1&blankifnone=1&hidepink=1&hidelight=1&showgrid=1&showsnr=1 Now, if WSJT-X uploaded reception spots for VE3GHM FN25 to pskreporter then that would also make for a very simple solution. I think I tried that but I may try it again just in case it does work. cheers, Graham ve3gtc On Fri, Jan 3, 2020 at 8:23 AM Reino Talarmo <[email protected]> wrote: > >Since my call is six characters the grid gets truncated hence the reason > for my journey of discovery down the path of digging into the WSJT-X source > to understand how the standard message with non-standard call logic works. > > > > Hi Graham, > > You have an interesting Pico Balloon project. May I ask how the FT8 mode > will should provide a belt and suspenders? I assume that the balloon > transmitter just broadcasts WSPR and/or FT8 without any reception > possibility and so nobody should answer to that CQ. If so I think that you > don’t need a ‘CQ’ in your message at all and could use Free text to > broadcast VE3GHM FN25 or whatever the locator may be. Even VE3GHM FN25JR > would just fit in! > > 73, Reino oh3mA > _______________________________________________ > wsjt-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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