Text 7030, 47 rader
Skriven 2008-07-30 00:03:00 av Bob Klahn (1:124/311)
     Kommentar till en text av Richard Webb
Ärende: The Black Experience
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 ...

 RW> WIth cable systems and broadband over powerline however
 RW> these systems generate rf. COnsider cable channel 14 for
 RW> example.  It's frequency band is 121 mhz, right smack dab
 RW> in the middle of the aircraft vhf band. THe fcc, and faa

 121.5 is the aircraft VHF Emergency frequency.

 ...

 RW> as noted above. CLosed loop systems such as cable TV borrow
 RW> rf spectrum, and are supposed to be "closed loops" and if
 RW> not, then the fcc and the public has a strong interest in
 RW> making them clean up their act.

 ...

 RW> Btw I could find carriers for the cable company in the
 RW> aircraft band, and demonstrated how this worked for dad.
 RW> THe pols in this case wouldn't know how to even begin to
 RW> promulgate rules to give their wishes some substance.
 RW> Hence some people with engineering backgrounds have to do
 RW> it. Only trouble is, these folks are often overruled by
 RW> different political crooks whose palms are greased by those
 RW> they're supposed to regulate.

 RW> Hence, the public that's supposed to win loses.

 ...

 Just figure it out. Ch 2 is 50mhz or thereabouts. Just add them
 up, 6mhz per channel, IIRC, for 120 channels. Broadcast TV
 splits them between low and high VHF, and UHF. Cable just runs
 right on up. Then add in your pay and other speciality channels.
 Used to be, maybe 35 years ago, cable ran from 5mhz to 300 mhz.
 Now they run fiber optics, and I don't know how far that can go.
 But they do change to cable going into your house. With all the
 RFI possibilities that implies.


BOB KLAHN bob.klahn@sev.org   http://home.toltbbs.com/bobklahn

... Only thing worse than getting old & forgetful is NOT getting old.
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