... it is worth noting that the battery voltage displayed from the telemetry is the instantaneous 'loaded' voltage at the time of the transmission, but the controller makes the decisions on the 'unloaded' battery voltage while not transmitting, so there will be a discrepancy between the action taken at "Full battery = >4.0V" noted in the table above and the voltage shown in the telemetry as displayed on Habhub.
Also, the internal resistance of the battery increases significantly at lower temperatures, so the 'unloaded' to 'loaded' voltage discrepancy will be larger at night. This becomes particularly apparent if the balloon bursts at night and the temperature increases as the altitude gets lower during the (approx.) 2 hours it takes to fall ... the battery voltage rises even though there is no solar charge!
BTW, two instances of WSJT-X v1.5.0-dev and two instances of WSPR-X running here on one computer being fed by two radios, one for 30m and another for 20m, and a selection of broadband directional antennas to choose from according to the position of the balloon. Some clever people have managed to get one radio to frequency hop to the schedule as required via CAT control
The challenge I enjoy is messing with antennas to get
consistent JT9 telemetry decodes from the 25mW transmitter from as far away as possible.
73,