[Milsurplus] Indicator, digital display

[Mike Andrews W5EGO]

On Thu, Jan 22, 2009 at 12:53:17AM -0500, Glenn Little WB4UIV wrote:
> I am trying to identify a piece of equipment that I uncovered.
> This is marked ID-1707A(V)1/U.
> It has 6 nixie tunes to read out Hours, minutes, and seconds.
> I has an input filter switch on the front with the following positions:
> 250 Hz, 1000 Hz, 20 KHz, 40 KHz and 80 KHz.
> Also on the front is a switch marked 1000 Hz/250 Hz, a switch marked 
> Reverse Code Control and a power switch.
> The rear has a 0.75A slo blo fuse in holder, a 4 pin connector marked 
> AUX OUTPUT, a 3 pin power input connector, a 24 pin parallel output 
> connector, a BNC connector marked INPUT and a BNC connector marked OUTPUT.
> Power comes in through a nice power line filter.
> The logic is TTL with date codes indicating that this was built 
> around mid to late 1974.
> The logic board is wire wrapped indicating only a few were built.
> The input circuit is on a PCB marked ASSY A3 ON175006.
> Other pieces have ON numbers on them indicating that this was 
> possibly crypto related.
> This is built into a rack mounted cabinet that looks to be 2RU high.
> It has a property tag indicating that it once was at N00069.
> 
> Does anyone recognize this?
> 
> Before I part it out, I would like to know what it was intended for.

It has the flavor of an IRIG (Inter-Range Instrumentation Group) time-
code decoder; this is reinforced in my mind by the ID- nomenclature. 
I'd really appreciate an image. It's possible that I might even 
recognize it from the image. 

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin