You're right John ...
---- Original Message ----
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Acoupleofquestionsabouthardline ??
Date: Mon, 24 Apr 2006 18:27:47 -0400
>The MF or Muti Freq. tones were even numbers 700 + 900,
>700 + 1100, 900 + 1100 for 1, 2, 3 then they used 1300 1500 1700
>with the other low group for the rest.
>
>This was known as "In band signalling" and is what the operators
>used on their tandem trunks (Inter office circuits) to place long
>distance calls. An idle circuit had 2600 tone on it
>also known as SF (Signalling frequency)
>
>73 John VE3AMZ (Retired Bell Canada)
Later, Motorola studied for a human ear sensitive tone to use on
their pager alerting ... and also settled on 2600 Hertz.
The first pagers that came out drew a lot of customer complaints -
as when the customer was on a long distance call and his pager
alerted him, his long distance call got dropped.
Fast forward ... apparently, the 2600 Hz alert tone was the same
tone Telco used as a disconnect tone.
BEEP - BLAST - your call got dropped ...
Neil
>
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>----- Original Message -----
>From: <[EMAIL PROTECTED]>
>To: <Repeater-Builder@yahoogroups.com>
>Sent: Monday, April 24, 2006 5:13 PM
>Subject: Re: [Repeater-Builder] A couple of questions about hard line
>
>
>>
>> Hi, I believe the term Multi-Frequency was used to describe the
>> early AT&T inter office toll dialing scheme.
>>
>> The tones used were not the tones you hear on your telephone -
>> but another completely different group.
>>
>> If I dig around here far enough, I may still have the
>> information.
>>
>> Mike, WA6ILQ, may be able to detail this better than I or,
>> perhaps, a retired AT&T or Western Electric systems engineer.
>>
>> Neil - WA6KLA
>>
>>
>>
>> ---- Original Message ----
>> From: [EMAIL PROTECTED]
>> To: Repeater-Builder@yahoogroups.com
>> Subject: Re: [Repeater-Builder] A couple of questions about hard
>line
>> Date: Mon, 24 Apr 2006 14:08:09 -0700
>>
>> >And Touch Tone (tm) is a registered trademark of AT&T. Everyone
>else
>> >has to use DTMF or MF depending on which side of the planet you
>are
>> >on.
>> >
>> >On 4/24/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>> >>
>> >> Of course !!
>> >>
>> >> CG = Channel Guard - General Electric
>> >>
>> >> PL = Private Line - Motorola
>> >>
>> >> QC = Quiet Channel - RCA
>> >>
>> >> All are commonly referred to by CTCSS
>> >>
>> >> Neil - WA6KLA
>> >>
>> >
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>> Yahoo! Groups Links
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>Yahoo! Groups Links
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