[BC] Older telephone systems

[Gary Glaenzer]

who can forget sorting out the 6 wires per phone, finding the open A1 lead,
crossed intercom wires, and all the other fun

those were the days !

Thank you Jerry McCarter of General Telephone for teaching a
wet-behind-the-ears broadcast engineer enough to be dangerous !


----- Original Message ----- 
From: "Jerry Mathis" <thebeaver32 at gmail.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Wednesday, May 21, 2008 12:32 PM
Subject: [BC] Older telephone systems


> Moving a tad off topic, I used to be fascinated by this kind of thing
> myself. Telephones and telephone exchanges and PBX's were a hobby of
> mine for many years. I installed several different PBX's at a private
> school I attended. The first one was an all-relay system, first
> installed in a bank in Illinois in the 1930's. It had 25 lines, with
> the capability of 2-party lines with ground ringing, 4 city trunks,
> and 6 line-finders. Dial tone was accomplished by a vibrating reed
> relay. Ring voltage at 20 Hz was provided by a weighted vibrating
> reed relay that opened and closed a set of contacts on a transformer,
> switching DC through the transformer primary. Watching it work was
> fascinating. It ran on 24 volts provided by two car batteries in series.
>
> The fun kind of went out of the hobby after even dedicated electronic
> cabinets went out of style, and it all became computerized.
>
> Jerry Mathis
>
> On Wed, May 21, 2008 at 11:16 AM, Paul B. Walker, Jr.
> <<mailto:walkerbroadcasting at gmail.com>walkerbroadcasting at gmail.com> wrote:
> No big deal, it's nothing more then a matter of curiosity as to how
> the numbers are assigned to specific towns.
>
>
>
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