I will be radiating a low power (about 4 watts RF,   1mW ERP)  test
transmission this evening (Saturday) using 30s BPSK with the transitions
locked to GPS plus a few microseconds.   The data sequence is 8 bits long and
synchronised to the hour,  repeating every 4 minutes.

The exact frequency is 136718.25Hz  (to do with DDS resolution using a 5MHz
clock).  Accuracy is within 3*10^-10 which means that during the 4 minute
sequence interval, absolute phase should drift by no more than 4 degrees.

No prize, but kudos, to the first person to work out the data sequence.   To
resolve the phase ambiguity problem, assume the first bit sent at the
reference point is a '0'

Andy  G4JNT