[GreenKeys] Model 15 remedial question Inbox

[Jason W6IEE]

On Sun, Jan 2, 2022 at 7:20 PM Jason W6IEE <kf6pqt at gmail.com> wrote:

> Holy heck, is that what that toggle is there for???
>
> I’ll post some pics.
>
> On Sat, Jan 1, 2022 at 2:09 PM Robert Downs via GreenKeys <
> greenkeys at mailman.qth.net> wrote:
>
>> Minor correction – late in the production life of the Model 14/15/19,
>> Teletype Corp came out with a second type of selector unit that usually has
>> a DPDT toggle switch mounted on it that could be switched between 60 mA and
>> the later standard of 20 mA by connecting the two coils in either series
>> for 20 mA or parallel for 60 mA (note that no one that I know of has ever
>> come up with an explanation of why it is 20/60 instead of 30/60 – it just
>> is).  The new selector is called the “Holding Magnet” type and the original
>> type came to be called the “Pulling Magnet” type.  The Pulling Magnet
>> selector cannot be rewired to operate on 20 mA because  the two coils are
>> already in series.
>>
>>
>>
>> If someone removed the switch and hard wired the magnets or if you have
>> just a loose magnet, it is easy to ID which type of coil you have.  The
>> original Pulling Magnet coils are round (and larger).  The Holding Magnets
>> coils are square (and smaller).  You can also ID the two types by opening
>> the loop or turning off the DC supply and letting the machine run open.
>> The armature of the Pulling Magnet selector will not move or jump around as
>> the motor runs.  The armature of the Holding Magnet type will jump as the
>> drive shaft rotates.  The armature of the holding magnet type is held in
>> the Mark position if the pulse is a Mark and allowed to fall away if a
>> Space.  Hence the name.
>>
>>
>>
>> Robert Downs
>>
>>
>>
>> *From:* greenkeys-bounces at mailman.qth.net [mailto:
>> greenkeys-bounces at mailman.qth.net] *On Behalf Of *Tom Hunter
>> *Sent:* Friday, December 31, 2021 23:14
>> *To:* GreenKeys at mailman.qth.net
>> *Subject:* [GreenKeys] Model 15 remedial question Inbox
>>
>>
>>
>> Jason,
>>
>>
>>
>> You need to measure the current flowing through your model 15, even with
>> a multimeter in series with your loop.
>>
>> It should be 60 Milliamps. I have voltages from 80 to 180 in my various
>> loops, but in all cases the current is set to 60 mils by variable
>> resistors. I have so many places to measure loops, I buy 100 milliamp panel
>> meters three at a time.
>>
>>
>>
>> By the way, 120 is the most common voltage.
>>
>>
>>
>> But the current MUST be 60 mils for a model 15!
>>
>>
>>
>> If you have your loop connected to the selector magnet, it should be
>> pulled in already.If you can still push the armature in, then there is
>> something very wrong with you loop supply. Harold is correct - everything
>> in the loop is in series. If you want two machines to talk to each other,
>> both keyboards and both selectors are all in series across the loop supply.
>>
>>
>>
>> I have machines in three different locations here and everything is in
>> series.
>>
>>
>>
>>
>>
>> Tom N3CRK
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>>
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>>
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>
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>
-- 
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