[GreenKeys] Whazzit? Normal Input Keying (NIK)

[Nick England]

Actually I got that definition of NIK from an Army manual of definitions :-)

TM 11-5815-602-24 says that the UGC-74 supports "NIK for the TSEC/KW-7"

AHA, I just found a KW-7 interface drawing in that manual that says the
marking contact current is 80uA. So NIK is evidently a 50-80uA loop current.

Additional note - there is a STEP connector on the KW-7 so I guess it was
one of the crypto units that put out that 50mA pulse to release a character
from the TD or keyboard.

The UGC-74 also supports +/-6V signaling (MIL-STD-188C) - what the Navy
meant by "low-level" signaling (and that's also what this Army document
calls it)

Info from a TI document -
LOW LEVEL - Military Standard 188C (MIL-STD-188C) is similar to
TIA/EIA-232-F in the fact that it specifies an unbalanced point-to-point
interface. Driver output is +/-5v to +/-7v and receiver input impedance is
>6k ohms

See also "Low Level Technical Control Equipment"
http://www.navy-radio.com/manuals/tty_ctl-391-6010.pdf

I suppose this could all be part of a disinformation plot to confuse us
about what was actually connected to what....

Nick England K4NYW
www.navy-radio.com

On Fri, Sep 23, 2016 at 5:40 PM, Duncan Brown <duncanancy at earthlink.net>
wrote:

> Nick,
>
> Never heard of "NIK" in the Army.  Our KLI equipment connected to KW-7s
> with "low level keying". As I remember, it was a 50uA current loop and
> unidirectional (not polar). The KLI keyboards and tape readers had both
> Mark & Space contacts, but the Space contacts were never used, even with
> the KW-7.
>
>
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