Used to be the audio sub carrier for Ch 18 on Charter was on 145.25. I
have no idea now, but cable can cover a very wide spectrum.
I haven't looked at cable with a SA since digital.
There's a lot of internet on there too.
73
Roger (K8RI)
On 9/13/2016 Tuesday 4:42 PM, Jim Brown wrote:
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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