How High Is The Balloon?

The WSPR power field is used to convey altitude. (I’m using a 10 mW output into a dipole). The latest data can be found in the WSPRnet database.

Note – this is out of date, we’re now using more precise 6 character grid square and more precise altitude using Type 1 andf Type 3 WSPR messages.

The WSPR data is transferred to APRS.fi with this format: RX_UTC_day  RX_UTC_time  Callsign  Frequency_MHz  RX_SNR_dB  RX_drift  TX_gridsquare  TX_power_dBm  RX_callsign  RX_gridsquare  RX_miles