But there are two weird voltage drops which I can't explain.
Looking at it in more detail I find that
(a) the voltage drop occurs between the end of the previous wake cycle and the measurement at the beginning of the next wake cycle. So this issue doesn't seem to be caused during the wake cycle.
(b) I also log which time stamp I received in the packet that woke the Mote for the measurement. In the first case this is a 1, in the second a 0. The possible range being [0,2800] I think this cannot be coincidence.
Together it seems as if the radio is kept in rx for a longer period than usual. That leads to it catching very early packets in a burst and it also explains why the voltage is already down when I do the initial measurement. Another listen mode bug?
Tom, how does your data look?