[GreenKeys] Whazzit? Normal Input Keying (NIK)

[Nick England]

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
www.navy-radio.com
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