Paul, The number of time-out (“missed”) messages is not the same as the real number of missed signals. The weewx-rtldavis driver has the following calculation: number of missed signals is theoretical number of expected signals minus number of received signals. For one transmitter the data you found might be close, but if there are more transmitters near-by, the hopping frequencies will interfere at a regular interval. In my situation, with four transmitters active, about 10% of the messages of each transmitter is lost. Channel 0 should get a message each 2.5625 seconds; add 0.0625 seconds for each next channel. The messages of channel 7 should come exactly each 3.0 seconds.
Luc
