[GreenKeys] Model 15 remedial question Inbox

Mon Jan 3 11:30:54 EST 2022

For some reason I didn't get the pictures.

I just wanted to point out the switch detail, sorry if a duplicate.

The P visible in the slot to the right of the upper screw is an 
indication of parallel connection.  If you flip the switch to the other 
side it will reveal an S indicating serial connection.

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 1/2/2022 9:20 PM, Jason W6IEE 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 <mailto: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>
>     [mailto: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 <mailto: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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