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The Telecom Digest for Sun, 21 Nov 2021
Volume 40 : Issue 300 : "text" format

table of contents
Re: Does anyone remember the IMTS System?
Re: Does anyone remember the IMTS System?

Message-ID: <20211121044129.GA1760@telecom.csail.mit.edu> Date: Sun, 21 Nov 2021 04:41:29 +0000 From: Moderator <telecomdigestsubmissions@remove-this.telecom-digest.org> Subject: Re: Does anyone remember the IMTS System? On Thursday, May 21, 2015 at 4:43:36 PM UTC-7, Bill Horne wrote: > Here's a trip down memory lane: does anyone remember the IMTS > systems that preceded cellular? I find myself getting nostalgic > for the "good old days" of the mobile world, and I wonder if > any of that equipment has been converted to other uses. Here's an excellent site that covers both "MJ" (VHF) and "MK" (UHF) IMTS Systems ... http://www.wb6nvh.com/MTSfiles/Carphone5.htm -- Bill Horne Telecom Digest Moderator
Message-ID: <snbfg5$b5h$1@panix2.panix.com> Date: 20 Nov 2021 18:41:09 -0000 From: "Scott Dorsey" <kludge@panix.com> Subject: Re: Does anyone remember the IMTS System? Jay Hennigan <nobody@example.com.invalid> wrote: >Organization: Disgruntled Postal Workers Against Gun Control > >On 2021-11-02 15:27:34 +0000, Marc SCHAEFER said: > >> Simple generation: >> >> sox -V -r 48000 -n -b 16 -c 2 imts-disconnect.wav synth 30 sin 1336 >> sin 1800 vol -10dB >> >> The file is on: >> >> https://login.alphanet.ch/~schaefer/tmp/imts-disconnect.wav >> >> You could then adapt the sox command line for your needs. > > Not quite. The tones alternate at 20 pulses per second, not > simultaneous. 1336 for 50ms, then 1800 for 50 ms, then 1633 for 50 > ms, You should be able to do that with sox too. Check the man page. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis."

End of telecom Digest Sun, 21 Nov 2021

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