On 12/9/2010 6:50 AM, Patrick Dyer wrote:
> 145.25 is the CATV Ch 18 (Ch E) NTSC video carrier frequency, and on an
> (FM) HT it will sound pretty much like unmodulated dead air. The audio
> for that is 4.5 MHz higher (so out of the 2m band). It's the only basis
> that the FCC will accept a formal complaint from hams for CATV egress
> RFI situations.
Not sure I understand the wording of that.
If you can hear them, they can hear you. Years ago...actually many
years ago...Bout 81, or 82 I lived in Alma MI. I was driving home and
noted some interference on the 2 meter rig. Tuning to 145.25 I found it
full scale. Much of the East and North side of town (the only area I
drove in) were that way. As I drove right by the
receiving/distribution center/office on the way into town I stopped for
a chat. When I walked in I keyed the HT and their set went dark. The
receptionist immediately called service. They weren't impressed as I was
so close to the set. So, I asked them if this was the distribution
center wasn't every one down stream seeing the same thing. They
nonchalantly said "it's probably just this set" without checking.
Sooo... I pointed out my car on the other side of the parking lot and
suggested I try the mobile. A quick test, some one answered me and we
started a short chat explaining what I was doing. About that time I saw
the guy come out of the office waving his hands. I was dumping the
cable system for the entire town.
Back inside I explained that there were quite of few of us living in
town and that almost all ran as much power as I did because it was quite
a distance to the repeater...which took another explanation. At any
rate we both figured if I could hear them they could hear me and so
could any one down stream of the egress/ingress point. When I came home
the next day, most of my route was clean. The next day most of the town
was much better and within a week there was not a spot in town where I
could hear them. I did stop by the office and than them.
Of course if it's just in a house that's a bit different and
particularly with an illegal tap. Had one of those across the road many
OTOH with the telephone, I lost service one day, which was not uncommon,
but this time they didn't find any problems outside the house which cost
me $50. A search found a unterminated run (behind the desk that held
the rigs) with all the wires stripped and twisted together as neatly as
if it had been on purpose. ... CAT!
> I had to resort to that (thru the FCC Houston office)
> to get the local CATV moving on what turned out to be a classic case of
> "dog-chewed cable" on adjacent property in early 1991. The CATV work
> order/ticket actually had that as a checkable item of cause (it being so
> common)! The CATV coax was rerouted to minimize a reoccurrence.
> All the numerous CATV audios between 130-150+ MHz are a pretty good way
> to ascertain/demonstrate egress since they are not broadcast (OTA) TV
> freqs and "stand out". When the leaks were on OTA freqs such as this
> http://www.qsl.net/wa5iyx/images/833311.jpg could occur - Sept 1983 when
> our local Ch 4 was off (turned out to be an adjacent-east illegal tap,
> before TX had enacted any CATV theft-of-service statutes, "cured" by
> changing the 4-port in the pedestal in their yard to a 3-port. BTW, the
> renters were evicted 2 mon. later.). Needless to say, with that source
> at c. 20 ft away it really messed up my OTA TV reception. (And probably
> provided good CATV ingress for any of my VHF RF :<)
> 73, Pat - WA5IYX
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