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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
- Date: Mon, 28 Dec 92 00:28:46 GMT
- From: rice@ttd.teradyne.com
- Newsgroups: comp.dcom.telecom
- Subject: Re: GTE Rural Area Phones Go Digital
- Message-ID: <telecom12.923.6@eecs.nwu.edu>
- Organization: Teradyne Inc., Telecommunications Division
- Sender: Telecom@eecs.nwu.edu
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 12, Issue 923, Message 6 of 9
- Lines: 32
-
- In article <telecom12.920.4@eecs.nwu.edu>, johnl@iecc.cambridge.ma.us
- (John R. Levine) writes:
-
- >>> [GTE says] benefits: ...; no threat of calls being monitored
-
- >> So, let's see: the phone calls are transmitted over radio now, so that
- >> eliminates that threat of them being monitored?
-
- > I suspect they were referring to monitoring by nosy neighbors on party
- > lines. Phone calls are carried all over the place by microwave.
- > Although it's certainly possible to snoop if you really want to, the
- > tightly focused beams require the snooper to be close to the line of
- > sight between the two dishes, and there are usually multiplexing
- > schemes more complex than your usual Radio Shack scanner can decode.
-
- 450 Mhz (As noted in the original post) is not 'microwave'. 'Dish'
- antennas aren't normally used at these frequencies. I am, however,
- confused about the message header (referred to "digital"). There
- wasn't anything in the message about 'digital radio', which would be
- difficult to monitor. The bandwidth required to run 24+ channels of
- digital, on 450 Mhz would be pretty wide, considering that most of the
- other services in the 450 Mhz band are NBFM (Narrow Band F.M.).
-
- If anyone has more information on these systems, please enlighten us.
-
-
- John Rice K9IJ | "Did I say that ?" I must have, but It was
- | MY opinion only, no one else's...Especially
- | Not my Employer's....
- rice@ttd.teradyne.com | Purveyor of Miracles,Magic and Sleight-of-hand
-
-