Sadly, the RF phase in ASAIR_A_RF45 changed again (see the previous report).

This time, an optimum demodulation phase for the simple Michelson was found to be 30 deg in ASAIR_RF45 while it was 14 deg last night. If we blame today's table repositioning (see alog 13683) for this phase shift, the ASAIR path would have shifted by (3 x 10⁸ m/s) / (45 MHz) x (16 deg) / (360 deg) = 30 cm. This seemed too big as we did not so much modify the setup. Also, I quickly checked the REFL_A_RF45 by locking PRX on the carrier. The optimum demodulation phase was 6.9 deg and this is slightly off from the last night which was 4.6 deg. No idea what is going on.