[GreenKeys] mystery machines

[Eric Scace K3NA]

   Cable signaling code was self-synchronizing.  It is a bi-polar code using equal length elements for both dot and dash.  One
polarity was sent down the cable for a dot and the reverse polarity was sent down the cable for a dash.  No power to the cable when
nothing was sent.  Synchronization is achieved by watching for the polarity transitions.

   No gaps were needed for separating dots and dashes within a letter; gaps were only required between letters and words.  This, in
conjunction with the uniform symbol duration for both dots and dashes, made cable code much faster.  "PARIS" would be rendered as
+--+O+-O+-+O++O+++, taking just 18 units (plus two for the word space) in cable code.  In conventional code PARIS requires 25
additional units for the long dashes and the inter-element spaces.

   Hand keys for undersea cables were a bit out of the ordinary from a ham's perspective.  The mechanism contained two keys mounted
next to each other.  The operator pressed one to apply the polarity for a dot and pressed the other for dash polarity.

   The equipment to implement all this stuff is on display, and runs in working order as a complete cable telegraph station, at the
fabulous Cable & Wireless Museum of Undersea Telegraphy at Porth Curno (near Penzance), at the far southwest tip of England.

   Multiplex is something else...

-- Eric K3NA

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net]On Behalf Of Tom Kleinschmidt
Sent: 2004 November 22 21:47
To: George B. Hutchison; greenkeys at mailman.qth.net; gil smith
Cc: ashor002 at aol.com
Subject: Re: [GreenKeys] mystery machines


George you are right on! The perforator is a Kleinschmidt Electric design.
Teletype made them at least trough the 1940s. During WWII they were used "by
the U.S Government".

The Teletype manual is Bulletin 125 " Description and Adjustments of the
Teletype Wheatstone Perforator and the parts manual is Bulletin 1025 There
are also various updates. Interesting there is no model number listed in the
documents

Per the manual you can get the unit with "Continental" or "Cable" signaling
code. This is also known as Multiplex telegraph - it only synchronizes at
the beginning of the message - fast but can turn to a jumbled mess quickly.
None of that stinkin' start stop stuff :>)

I have an original Kleinschmidt and 2 Teletype. One of the Teletype's has a
Russian keyboard. The interesting thing on the Kleinschmidt is it is the one
photographed in my Great Grandfather's book - it was returned to him by a
customer working after 30 years of service! The space bar is wood and a
portion of it is worn half way down!

As for the distributor, this is the first one I have seen. More info is
greatly appreciated!

Tom
----- Original Message -----
From: "George B. Hutchison" <w7tty at usintouch.com>
To: <greenkeys at mailman.qth.net>; "gil smith" <gil at vauxelectronics.com>
Cc: <ashor002 at aol.com>
Sent: Monday, November 22, 2004 10:23 AM
Subject: Re: [GreenKeys] mystery machines


> Gil and GreenKeyers - - -
>
> You have uncovered a Morse Perforator that I believe was a Kleinschmidt
> design but late production as indicated by the Teletype name plate on the
> cover.
>
> The second machine that appears to be a variable-speed morse transmitter,
a
> companion to the perforator. I have never seen the likes of the
transmitter
> before, but judging from the tape path and the narrow wheel, plus the
> interesting contact set on the lower left deck, I don't think I am far
off.
>
> Dick Dillman, W6AWO, has a manual on the perforator. Seems to me the most
> common CW Tape Transmitters were made by Boeheme. I think Jim Haynes or
Tom
> Kleinschmidt will end up being the master info resources for both items.
>
> 73,
>
> George, W7TTY
>
>
> _______________________________________________
> GreenKeys mailing list
> GreenKeys at mailman.qth.net
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