What you are seeing is the Switching Power Supply cycle on and off, 15 seconds on, 45 seconds off,
constantly to keep the back up battery charged. Also the Switching Supply has close to 10KHz pulses
that generate a Square Wave rich in harmonics that generate Harmonics. The filtering from 14MHz to
430MHz is almost non existent.
Maybe with luck, you might get 20dB more rejection with shielding, but that may not be enough !
Verizon's System Engineering for FIOS, if it even exists, would need to look at this to really solve the problem.
Most places just buy Third Party componets abd deploy this crap out in the field. 99.5 % of the time, it works, but in your case your the 0.5% and not in their norm for them to know what is going on !
( FFT) Fast Fourier analysis of a square wave that represents their signal content to be very broadband
from their unit. Having a receiver that can see almost down to -120dBm makes it very difficult to eliminate
such interference.
Verizon would need change the way they are charging the Back up Battery without a Switching Supply.
The typical Verizon Techs are just hands on Monkey Techs with no real knowledge. You need to talk to a real
RFI Engineer to really know how to solve the problem. '
Good Luck, very few at Verizon know what's going on, unless you talk to a real Engineer.
73's
RFI Engineer