Re: Transmitter update
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It's a single defined frequency per band - so no need to change based on regions like you have to with APRS or other VHF/UHF modes.
I do, however, have to add some logic so it won't transmit over certain countries where airborne transmissions are illegal. I'm not sure yet whether to do this geofencing based on lat/lon or grid square.
Mine will do 20 meters WSPR only. So it can be locked on the defined 20 meter frequency with a tuned dipole. The signal generator makes the slight changes in tones (4 of them total) to encode the almost 2-minute long WSPR transmission.
Some balloons are using 20 and 30 meter WSPR, but this makes the antenna configuration a bit more complex. And some are also using APRS with a separate transmitter. I may add APRS depending on what the weight comes to.
On Fri, Jun 9, 2017 at 3:41 PM, Tyler Griffiths <tyler.griffiths@...> wrote: