Use APKPure App
Get WSPR Tx old version APK for Android
WSPR Tx is WSPR signal source for your transceiver.
WSPR Tx is WSPR signal source for your transceiver.
You need radio transceiver with VOX enabled to use this free app.
Set your call sign, grid locator, transceiver power level. Adjust TX framing (minutes) and TX frequency offset. And press start.
You need an amateur radio license to send signals.