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Antique Telephone with modern telephone ring problem

Discussion in 'General Electronics' started by Dave, Oct 8, 2003.

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  1. Dave

    Dave Guest

    Hello all,

    I've hooked up an antique telephone (Automatic Electric AE50A, I
    think) in with the rest of my modern phones. The problem I'm having is
    that either the antique phone will ring with the others not ringing,
    or vise-versa. I would like both to ring. I'll provide more detailed
    info later (i.e. which wires cause what).

    Is anyone familiar with this?

    Thanks in advance,
  2. Rein Wiehler

    Rein Wiehler Guest

    And before you added that "antique" phone everything was ok?
    Old phones needed quite a bit of ringing voltage (~80-100VAC at 20Hz)
    to get the ringer going. And if per chance you are not close to the
    exchange you are at the signaling limit on your loop
    which does no allow to connect to many phones at once. Wait if somebody
    comes with an idea how to change the ringer in the "antique" phone.

    Was all mechanical.
  3. The load factor of the phone is too high in relation to the newer type

    Jerry Greenberg
  4. Dbowey

    Dbowey Guest

    jerry posted:
    Ok, I'll bite. What is the "load factor of a telephone."

  5. It's called a REN (Ringer Equivalence Number) It indicates how much
    current is needed by the ringer circuit. Old style mechanical bell
    phones have a REN of 1. Most modern phones have a REN far less than 1.
    Part 68 says that the phone company should supply enough current to meet
    the need of 5 REN's. Since he only has one old style phone, there
    should be no problem.

    Perhaps the OP was unhappy that the old phone actually rang when the
    ringer signal was applied, whereas the newer phones tend to ring at
    their own leisure after detecting the ringer signal's presence.

  6. Dbowey

    Dbowey Guest

    michael posted:
    I was hoping too see a response from jerry, who coined the "load factor" term.

    I imagine he is just another guy with nothing meaningful to say, but wants to
    post anyhow.

    By the way, older phones may present a load equivalent to several 1 REN phones,
    and since they pre-date the Registration rules, there is no way to determine
    their REN short of testing. Also, many older non-Bell phones are tuned to one
    of many frequencys, unlike Bell phones, which have had 20 Hz ringers just about
    forever. Mixing old and new is a trap-shoot; you may get a hit or a miss and
    you get what you get.

  7. Oops, sorry to interfere.
    I forget the specific model number, but a "standard" phone was assigned
    the value of 1 when the REN system was fabricated by ma bell. I don't
    know why they couldn't just tell us how many watts (Amp-hours?,
    Watt-seconds?) per REN. I suspect that one REN is something less than
    20mA maximum current which really surprises me that it's enough power to
    ring a rather large mechanical bell.
    Lately I've been tinkering with a phone line powered caller-id display.
    It just about working now, but I still get some bit errors mucking
    things up. I did the 1200 baud FSK modem in software on a PIC chip. At
    any rate, that's why I'm "in the know" on the REN thing. ;-)

  8. Thats kind of nasty. I usually find Jerry's comments worth reading. I
    just went to the Yahoo home page and typed in 'ringer equivalent' and
    got 15,100 hits. That seems meaningful to me. BTW, I have nothing
    meaningful to say.
  9. Dbowey

    Dbowey Guest

    GG posted:
    And how many relevant hits did you get for "load factor of a telephone?"
  10. N. Thornton

    N. Thornton Guest


    The OP cleverly forgot to tell us which part of the planet they're on.
    In England mechanical phones are REN 4, modern phones are REN 1. Total
    max domestic load is REN 4. Hence connecting an oldie plus several new
    ones is optimistic.

    They're all 16Hz here, so at least no tuning issues.

    Regards, NT
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