[Scan-DC] Classical music on 149.750 mhz

[john wilson]

    There will be some RF leakage on cable tv distribution systems.  The issue is whether or not it exceeds FCC maximum set limits.  This is a main reason that wise cable companies do not use mid-band channel frequencies in the 109-136 mhz.
frequency range due to possible interference with aircraft communications.  The FCC enforcement office gives that type of interference (safety of life) top priority.  I have a cable tv trunk
line routed on my road.  I have tower mast mounted preamps with Scantennas among other antennas located approximately 100 ft. from the road.
I pick up a weak video raster and audio on various high band vhf and uhf cable tv "channels".  Approximately 10 years ago my reception was severely affected with continuous RF intermod/video hum at different high band frequencies.  I suspected a
serious leak in the cable tv system.  I called and the cable guy found a rf coax connector had stress cracked in an in line distribution amp located about 500 ft. from my house and RF was spewing like a burst watermain.  He replaced the amp and
the problem was corrected.  I still some rf leakage, but it was back to the previous levels.

  Some cable co. vehicles have "snooper" receivers in them.  Along with the tv channels transmitted with be an FM transmission typically on an unused local area frequency in the 108-118 mhz. range (aircraft beacon/ILS range).  In my area one cable
company used 108.625 mhz. and another
117.450 mhz.  The snooper signal should not be strong if heard and may have a warbling audio like that on an emergency beacon audio.  When a vehicle's receiver hears snooper audio above a preset receiver  threshold level, the driver reports it as
a possible trouble area that needs to be checked or uses the signal it to assist in locating a rf distribution leak.

Stephen Platt wrote:

> Definitely cable tv leakage. If you have a handheld you might be able to find where it's leaking from if you walk around with your scanner without the antenna. Just might find an illegal hookup! 149.75 is the audio for cable 18; video 145.25 .
>
> You might be interested in reading about CATVI at my website www.qsl.net/kc4jgc/ and click on "cable TVI" on the 2nd paragraph.
> Steve KC4JGC
> Norfolk VA
>
> --------------------------------------------------------------------------------
>
> Any reason I'm hearing classical music on 149.750mhz
> from about 945Z(when I woke up) and it's still going
> strong as of 1030Z .... Narrow band FM modulation,  No
> station ID, etc... just classical for the last 45
> minutes or so...
>
> Matt
>
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