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Hi Joe
How many balloons do you intend to launch at the same time with the same call sign.?
Technically it is possible with the QRP-LABS tracking website, as long as the channel number is different, on each flight, and it would be better if there was no overlap or similar numbers on the telemetry ( 0x4xxx) timing.
That being said, Wsprnet maps probably would be confused and look odd with a number of tx sources and lines coming from the same callsign in different locations all over the world. And in practice ham radio operators do not usually transmit with the same callsign from different locations at the same time.
QRP-Labs tracking is supposed to filter for frequency and the timing of the Wspr and telemetry transmission and so all the balloons with the same callsign, should all be separated in tracking.? Other tracking websites may not filter for all these variables in the same way.
As far as I know, this venture with many balloons with the same unique callsign has not been tested extensively on the QRPLABS tracking website
You might not want to fly the same callsign , launch the balloons, and find there are data collisions. Definitely it would be a good idea to test all your radios on the ground at the same time and see what happens. I personally have 3 callsigns for multiple balloon events. The safest way, and what I would suggest for the moment, is to borrow a callsign from Ham friends and fly different callsigns on each balloon.
There may be another possible way of tracking... Tom W5KUB is showing a number of different flights on Sondehub but there is only one instance W5KUB on the Wspr website.? Perhaps Tom will chime in on this one.
Dave VE3KCL