[GreenKeys] Whazzit? Normal Input Keying (NIK)

[Nick England]

Hi Jim - this is different from the stepping modifications. I understand
that stepping allowed the crypto equipment to tell the TD or keyboard to go
ahead and release a character. As far as I can tell the M28 stepping mod
was essentially the same as for the KLI you describe - that makes sense
because you might connect either M28 or KLI equipment to the crypto unit.

This Normal Keying Input only changes the loop current from the TD or
keyboard contacts to the crypto unit input. It appears to put a couple of
4.7K resistors in series with the loop. I don't know what voltage/current
was actually in the loop but it was evidently supplied by the crypto unit.
Must have been pretty low current because one place mentions the need to
keep the TTY equipment's non-gold contacts very clean.

Nick England K4NYW
www.navy-radio.com

On Fri, Sep 23, 2016 at 5:02 PM, Jim Plummer <k8ary at yahoo.com> wrote:
>
> 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)
> .....
> 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.
> ...
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