[GreenKeys] Teletype Monopulse printer

[Duncan M. Brown]

Officially known as the "Model 36", the "Monopulse" sends one pulse for
each character.  The length of the pulse controls how far the typewheel
rotates.

I have never seen one, but I belive that the M36 typewheel is a cylinder
like the type wheel on a M28 and TT-76 reperfs.  The M31 type surface is
curved, but is only about 1/4 (or less?) of a full cylinder. 

The AWA Museum has a M36 transmitter.  It is about 4" square, with the
letters of the alphabet arranged in a circle.  When you press a key, a
rotating arm is released from its "rest" position and rotates to the key
that was pressed.  During this rotation time, current flows and the
receiver type wheel rotates also to the proper position.  Then, somehow,
the transmitter rotating arm must return to the rest position before the
next key is pressed.  We don't have a receiver (or if we do, I've never
seen it) so I have never seen the whole system in operation.

They were designed for low speed, low volume, low cost applications, such
as inter plant communications.  But I don't think that they ever became
very popular.

have fun,

Duncan Brown, K2OEQ
USASA  31J

Chief TTY operator & repairman
AWA Electronic Communication Museum
http://www.antiquewireless.org/



> [Original Message]
> From: David Ross <ross at hypertools.com>
> To: Greenkeys <greenkeys at mailman.qth.net>
> Date: 19-Nov-09 15:17:34
> Subject: Re: [GreenKeys] Teletype Monopulse printer
>
> Brooke -
>
>    What does "Monopulse" mean?  Does it have to do with the signal 
> format that drives the printer?
>
>    More & larger photos of the mechanism would be nice.
>
>    Maybe it has parts that are common with the Teletype Model 31.
>
> Dave Ross    N7EPI
>
>
>
> Brooke Clarke wrote:
> > Hi:
> > 
> > I've received the printer and have some photos at:
> > http://www.prc68.com/I/Monopulse.shtml
> > Unfortunately it's missing the print wheel and some unknown component
that had 
> > 3 wires cut.
> > 
> > Have Fun,
> > 
> > Brooke Clarke
> > http://www.prc68.com
> > 
> > Brooke Clarke wrote:
> >> Hi Jerry:
> >>
> >> It's on the way to me.
> >> How to find out more about the Teletype Monopulse printer????
> >>
> >> Have Fun,
> >>
> >> Brooke Clarke
> >> http://www.prc68.com
> >>
> >> gfmurphy at earthlink.net wrote:
> >>> There is a Teletype Monopulse printer available on
> >>> Craigslist.  The link is:
> >>>      http://sfbay.craigslist.org/sby/atq/1456216759.html
> >>> The seller is located in Santa Clara, Calif. and
> >>> they are asking $195.00 for it.
> >>> Regards,  Jerry Murphy
> >>>
> >>>
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