I can't imagine any noise source that would be suppressed by the transmission PLL loop gain. In principle, we could
just use a frequency counter there instead of a loop and get the same information.
Since our incoming vacuum system doesn't suppress any noise in the IO or transmission, you might as well build a sealed
plastic box to encase the transmission to see if there's any effect. Of course, even better would be to
FINISH THE RFPD ELECTRONICS DESIGN