[GreenKeys] Model 15 remedial question Inbox

[Jason W6IEE]

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
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive:
> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to kf6pqt at gmail.com

-- 
--... ...--
W6IEE, formerly KF6PQT
http://en.wikipedia.org/wiki/Junk_box
http://kf6pqt.net
http://www.flickr.com/photos/kf6pqt/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20220102/86906ee8/attachment.html>