I'm working on updates to the ARRL Handbook, and would like to provide
frequencies for carriers that can be used to probe for cable leakage.
The idea is to allow a portable RX (like a talkie with wideband RX) or a
mobile rig to probe along a system.
A Rigol looking at my drop from the Comcast system here in NorCal shows
a strong carrier at about 67.2 MHz (-41 dBm), and another around 133.23
MHz (-48 dBm). Everything else is around -70 dBm. (I buy only internet
and basic cable, so I see nothing below 67.2 MHz. Comcast discontinued
un-scrambled QAM several years ago when the FCC voted to allow them to
do so.)
Can anyone provide info about other systems commonly in use?
Thanks and 73, Jim K9YC
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