[GreenKeys] GreenKeys Digest, Vol 102, Issue 61

[Ralph Irish]

To David,  dbonamo at aprsnet.net

The item indicated in the photo is an answerback drum and trip solenoid.  The drum has 20-some slots, and each slot can hold
one 'blade' which might be preprogrammed by Teletype, or done by an indidivual to create any of the 32 Baudot/Murray codes.
As the drum spins, it interacts with the signal generator, or keyboard blades, I think, and generates the Mark-Space (or logic 
"1" and logic "0" functions to create a character.  Some keyboards have a key marked "Here Is" which, when pressed will
mechanically trip off the answerback sequence.  Once it gets to the last character it 'resets' itself and is ready for the 
next cycle.

In large networks, it was possible for someone to 'query' a remote station with a key labelled "WRU"  for Who Are You.  This
would trip the solenoid at the remote location and if the drum had the proper 'blades' in it, the identity or station number
of the remote station would be sent over the wire.

To keep both drums from operating, when the WRU sequence was  SENT, there was a contact that opened up to prevent the local
solenoid from operating during the sequence.

Some hams had that set to give out their 'RTTY ID' for the beginning and/or end of a QSO.  

My 28KSR has one of these and the ASR does not.

Ralph - W8ROI

- - - - - - - -


On Jul 23, 2012, at 4:27 PM, greenkeys-request at mailman.qth.net wrote:

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> Today's Topics:
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>   1. Model 28 Keyboard  What is this extra machinery? (David)
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> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sun, 22 Jul 2012 04:24:43 +0000
> From: David <dbonamo at aprsnet.net>
> Subject: [GreenKeys] Model 28 Keyboard  What is this extra machinery?
> To: "greenkeys at mailman.qth.net" <greenkeys at mailman.qth.net>
> Message-ID:
> 	<9DEB605CE02E7E40B6B68AF85ABB359CC189D7 at EXCHANGE1.hosted.exmailto.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> Hi All
> 
> 
> 
> I have t 28's ASR and KSR
> 
> 
> 
> I just notice something different this evening, on the KSR there is some additional mechanism to the right, I have attached a photo to the email.  Can anyone tell me what this is?
> 
> 
> 
> Thanks
> David
> 
> 
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> End of GreenKeys Digest, Vol 102, Issue 61
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