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Re: [RFI] CATV Frequencies for Leakage Probes

To: rfi@contesting.com
Subject: Re: [RFI] CATV Frequencies for Leakage Probes
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 14 Sep 2016 04:22:34 -0400
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
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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