Hey, Eric: I had a full-blown duplex UHF IMTS way back when and it, too, had a Secode system. It was about as automatic as one could get back then. In full auto, it would locate an unused channel, lock on it and let you know that it was time to dial. You could also go semi-auto and poke around the channels until you fell on an open one. As I recall, an open channel was indicated by a tone transmitted continuously on the open channel. When the IMTS mobile captured the channel, the tone went away and the Secode stuff did its thing. This IMTS phone was built into an attache case.
The RCVR had no squelch, but the RCVR audio was turned off until the radio captured a channel. 73, Dick W1NMZ ----- Original Message ----- From: Eric Lemmon To: [email protected] Sent: 25 March, 2006 21:24 Subject: RE: [Repeater-Builder] AGT = IMTS ? Skipp, I'm just grasping at straws. The IMTS is a lot more complex than a simple duplex system that might have been used internally by AGT rather than by subscribers. Back in the late 60's, I used a half-duplex GE Pacer (!) radio in an MTS system for a couple of years after IMTS became available. It would have been better to use a full-duplex radio, but this is what I had at the time. The Pacer was an all-tube radio, except for the transistorized power supply. It had a mechanical decoder made by Secode. To make a call, I had to key the handset for a few seconds, and wait for the mobile operator to respond. That was not much more sophisticated than a magneto telephone! I eventually got kicked off the system because there were only a handful of people using the manual MTS- everyone was scrambling to get on the IMTS bandwagon. Ah, yes... Those were the good old days! 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of skipp025 Sent: Saturday, March 25, 2006 9:01 PM To: [email protected] Subject: [Repeater-Builder] AGT = IMTS ? Would the Alberta Gov Telephones system be something like an IMTS (system) operation? Cute to think Motorola came out with something later than the Pulsar for IMTS... or was there a UHF/VHF Privacy Plus IMTS Phone? skipp > "Eric Lemmon" <[EMAIL PROTECTED]> wrote: > I suspect that your full-duplex radio was used in a mobile > telephone system by Alberta Government Telephones (AGT), > which later changed its name to TELUS. If there's no > selective call decoder in it, or loose wiring suggesting > that one was connected, it might have used multiple PL tones for > simple selection. Just a thought... > > 73, Eric Lemmon WB6FLY Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
