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."
