Text 7039, 61 rader
Skriven 2008-08-01 13:13:00 av Bob Klahn (1:124/311)
     Kommentar till en text av Richard Webb
Ärende: The Black Experience
============================
 RW> Hi Bob,

 RW> On Wed 2036-Jul-30 00:03, Bob Klahn (1:124/311) wrote to
 RW> Richard Webb:

 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

BK>>  121.5 is the aircraft VHF Emergency frequency.

 RW> YEp, and the one I use when I"m chasing rf interference
 RW> from powerlines and cable systems around here.  IF I can
 RW> hear it there I've got damned good ammo!

 I hadn't thought of that one. Now that is something they would
 "have" to address.

 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.

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

 RW> YEp, and that's the problem.  THough a staunch libertarian
 RW> in most aspects of life and government I still consider the
 RW> airwaves a public resource.

 Yep. My entire career in electronics started with Short wave
 listening. I still consider the airwaves sacred grounds.

 RW> Everybody wants a piece of
 RW> them these days, broadband wireless, baby monitors; garage
 RW> door openers; cell phones; business radio comms systems ....
 RW> SOmebody with some actual tech chops needs to balance the
 RW> interests of the public against the needs of the
 RW> individuals.

 And all too often it's the whims of the individuals.

 RW> Imho our regulators are doing a poor job of
 RW> regulating.  I could even use stronger language to express
 RW> my sentiments, but not in a public echo.

 Understood.


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

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