As we are meditating on things to look at for PRMI + 2 arms, Rana brought up the question of the demod board situation.
We then found this table on the wiki (LSC demod boards) that indicates that all of the demod boards were originally given lowpass filters, no matter the demodulation frequency. Back in September, I switched out the low pass filter for a bandpass filter in POP110, and put in the same bandpass when putting together AS110 (elog 9100). So, the 11MHz diodes are probably okay with lowpasses, and the 110 diodes are okay, but we need to think about all the other ones.
We should probably do a first guess by putting in a bandpass filter, but then simulate and measure to figure out what our requirements are for attenuation at the non-demodulation frequencies for each board.
The SXBPs from Minicircuits look pretty good, but there are lots of options on their website.
For tonight, Rana has put a coax 100 MHz highpass filter on the input to the REFL165 demod board.