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- Newsgroups: sci.electronics,rec.radio.amateur
- Path: sparky!uunet!decwrl!csus.edu!netcom.com!n1gak
- From: n1gak@netcom.com (Scott Statton)
- Subject: IMTS Telephony (saga)
- Message-ID: <pb9mwrh.n1gak@netcom.com>
- Date: Mon, 17 Aug 92 05:40:23 GMT
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- Summary: ANI Spill
- Followup-To: poster
- Keywords: IMTS Telephone Mobile
- Lines: 33
-
- Greetings,
-
- @SAGA ON
- I recently inherited a pair of IMTS mobile telephones. For those who
- don't know: IMTS is the predecssor to Cellular in the United States.
- VHF (155.x Mhz) and UHF (45x.x Mhz) and relatively high power. It's
- only serious drawback was the small number of channels available. 11
- VHF frequencies, and roughly the same number of UHF frequencies. Since
- those were shared over a very large geographic area, contention was, shall
- we say, heated. So - great thing - Cellular Telephones are invented and
- sell and everybody who hated not getting a channel moved over to AMPS and
- got crappy signal quality - handoffs to /dev/null and really much cheaper
- service. Even Better Thing: Now, with all the yuppie-scum moved up to
- 900 Mhz, IMTS is wide open. Nice loud signals, no handoff troubles, and
- no waiting for dial tone.
- @SAGA OFF
-
- Serious question:
- Does anyone know the signalling format for the ANI spill at
- the beginning. This is only a curiosity question. I worked for a company
- that made IMTS phones back in high-school, but I worked on user-interface
- stuff, and never needed to know the signalling behind it.
-
- Other serious question:
- What was the origin of the alpha codes for the frequencies,
- and what is the translation table to the numeric channel numbers?
-
- P.S. If anyone needs to know how to program the PROM for the Harris 1555,
- I've done it.
-
- Thanks in advance,
- Scott
-
-