[SML] Tele-Q & Practical Phones

[e-mail frank.wood95]

So should I.

A conventional telephone line has 50V DC between the two legs of the
line: ringing is an AC signal of about 75V at 25Hz. (it used to be 16
3/3Hz) The incoming line is only a two-wire connction, the othe two
wires being used for internal connections, such as connecting all the
bells in series. Hence the high ring voltage.

Modern telephones still maintain backwards compatibility with the old
Strowger central battery system, devised before 1909! So do modern
exchanges. While electronics has replaced electromagnetics in their
operation, they will still receive and send the same signals.


On 18 November 2014 22:12, Dorian Kelly via Stagecraft
<stagecraft at theatrical.net> wrote:
> I thought the teleQ provided the line power as well as the ring power, no?
> Dk
>
> Sent from my iPhone from illuminati. Please excuse brevity and autocorrect errors if any.
>
>> On 18 Nov 2014, at 21:33, Ford Sellers via Stagecraft <stagecraft at theatrical.net> wrote:
>>
>> Charlie Ruh said something really cool:
>> -----Original Message-----
>>
>> We've used the Viking DLE-200B to connect two standard phones as a standalone ring-down intercom for quite a few years with great success.  Uses standard phones and cable.
>> https://www.vikingelectronics.com/product-details.php?pid=38
>>
>> Charlie Ruh
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> WOW, Cool!
>>
>> Download the Ringdown guide, too.
>> It points out how to eliminate the 2 second delay, and to make it only ring in one direction (so your actors can't make it ring in the SM booth.)
>>
>> This is REALLY cool.
>>
>> -Ford
>>
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-- 
Frank Wood