The POP22/110 RFPD has been replaced by PDA10CF. As a result the 22 and 110 MHz signals became detectable.
However the signal level maybe too low according to a quick look with an RF spectrum analyzer.
The level at 22 and 110 MHz were both approximately -70 dBm although these values were measured when the central part was freely swinging.
Perhaps we need to amplify the signals depending on the actual SNR.
Also I have updated the optical tables' wiki page :
http://blue.ligo-wa.caltech.edu:8000/40m/Optical_Tables
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I will replace it by PDA10CF, which is made from InGaAs and supposed to have 10 times bigger responsibility.
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