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Two meter freqs in cable/TV systems; WAS Re: [aprssig] Yaesu FT1500M

Ron Stordahl ron.stordahl at digikey.com
Fri Mar 11 17:06:21 UTC 2005


We had a similar problem in my town, however the cable company fixed it 
because the leakage was 'in' as well as 'out', which resulted in picture 
interference on channels 18 and 19 when hams and when commercial 2 way 
users (police, ambulance, sheriff, highway patrol) were transmitting.  
These commercial users all run fairly powerful repeaters just above the 
2 meter band.  So if the 'teeth' have been removed, there is still 
customer satisfaction to consider by the cable company.  Our APRS and 
voice repeater no longer hears the cable nor does the cable hear them 
(at least as one can see from the picture, where previously wavey bars 
walked across the screen system wide).  On the other hand if I ran 1 KW 
on 2 meters I would not be surprised to get into sets on channels 18  
and 19, if for no other reason that the sets are not all that well shielded.

It seems to me that it would have been a lot easier for the cable 
company to just abandon 18 and 19, and put those services (Discover and 
MTV) on other channels, as I know they spent a lot of time 'tighting' up 
the system.

Ron, N5IN

Glenn Little WB4UIV wrote:

> The FCC removed the "teeth" from the rules. The cable company no 
> longer has to reduce the leakage below the point where they cause 
> interference, as long as they meet the leakage specs for the air band.
>
> Glenn
> WB4UIV
>
> At 07:54 AM 03/11/05, you wrote:
>
>> Can't you call The FCC and get this fixed? I used to fly a plane that
>> had special antennas for CATV leakage surveys.
>> 73
>> Joe
>>
>>
>> Glenn Little WB4UIV <glennmaillist at bellsouth.net> wrote on 03/11/2005,
>> 05:11:56 AM:
>> > Channel E is channel 18 and has a video carrier frequency of 
>> 145.250. We
>> > have a repeater here and cable causes a lot of interference.
>> >
>> > Channel 16 is 133.2625 MHz video carrier.
>> >
>> > Google is your
>> > friend
>> >
>> >
>> > 73 Glenn
>> > WB4UIV
>> >
>> >
>> >
>> > At 10:33 PM 03/10/05, you wrote:
>> > >Channel 16 on cable systems lies in the middle of the
>> > >two meter band as well.  Is it 146.55 or similar?
>> > >
>> > >Chris
>> > >KB8UIH
>> > >
>> > >--- Scott Miller  wrote:
>> > > > > (Channel "E" on analog cable systems lands almost
>> > > > directly on 144.39)
>> > > >
>> > > > Huh... my cable-ready TV only gets numbered
>> > > > channels.
>> > > >
>> > > > Maybe that's why I can never find anything good on
>> > > > TV.  Here I'd always
>> > > > figured it was because mass media had degenerated to
>> > > > a festering cesspool of
>> > > > reality shows and mindless drivel.
>> > > >
>> > > > I wonder if I can get a hexadecimal remote...
>> > > >
>> > > > Scott
>> > > > N1VG
>> > > >
>> > > >
>> > > > _______________________________________________
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>> > > > aprssig at lists.tapr.org
>> > > >
>> > >https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
>> > > >
>> > >
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>> >
>> >
>> >
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