[GreenKeys] Whazzit? Normal Input Keying (NIK)

[Jim Plummer]

Nick - While in the AF, I installed stepping modifications to the KLI equipment in our communication centers at Andersen AFB.  This was done to allow the crypto gear to pulse the TTY gear... that is to say the crypto was ready to receive or transmit.  The mod would allow the crypto gear to pulse the TDs via a low voltage relay.  Prior to the modification, the crypto equipment would "jump set" and have to be restarted with new code cards.  This must be the early version of the reboot.  What you described seems to be the M28 version of the same thing.  I don't know for certain how the 28 gear was stepped by the crypto as I never saw M28 and crypto in the same location.  
de Jim - K8ARY

 
      From: Nick England <navy.radio at gmail.com>
 To: Greenkeys <greenkeys at mailman.qth.net> 
 Sent: Friday, September 23, 2016 4:44 PM
 Subject: [GreenKeys] Whazzit? Normal Input Keying (NIK)
   
I have come across some Navy manuals on modifying M28 equipment for Normal Input Keying (NIK) for connections to crypto gear. NIK was new to me. 

The only definition I have found is:
normal input keying (A)
Low level keying in which battery to the teletypewriter keying
contacts is provided by the cryptoequipment.

So it seems that this is a variant of low-level signaling where the keying contacts in a TD or keyboard are handling some low current unipolar signal direct to the crypto gadget (KW-7, KW-26). 

I understand standard low-level signaling was differential bipolar +/- 6v.

Comments and/or Clarifications ??

Nick England K4NYW
http://www.navy-radio.com/

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