[time-nuts] looking for data on time code display
paulswedb at gmail.com
Sun Dec 11 22:29:19 EST 2011
It was just on the thread a month ago.
nematime $15 donation.
I have used it and it worked well.
On Sun, Dec 11, 2011 at 5:25 PM, J. Forster <jfor at quikus.com> wrote:
> I think I've seen IRIG Time Code SW for the PC that uses a sound card, but
> I forget where. The various IRIG formats are well dovumented.
> And yes, Time Code readers were used with high and low speed searches on
> IRIG tape recorders. You set Start and Stop points and the tape would
> Play, Stop, Reverse, Stop, Play as you demuxed/analyzed the data.
> Typically there were 5 or 12 tracks of analog data and two time code
> tracks. Sometimes digit was recorded in roughly the same way.
> > Fascinating. I also have one of these with slight differences, but it
> > does have a Fort Meade tag. Bought it from a guy on the BoatAnchors
> > list in Atlanta in the dim past.
> > The HTID number is H9823180065821, NSN 664500DISPLAY, User ID STWA104
> > The rotary switch adds a 160 KHz position. The two switches are marked
> > CODE POLARITY and POWER ON. The rear panel has a 4 pin circular jack
> > labeled AUX and a 24 pin rectangular connector marked PARALLEL.
> > A partly torn tag taped to the top says Made by TRAK, Model ?? 2234/U,
> > SN 517. A plastic envelope contained a DD Form 1348-1A release/receipt
> > document from the Defense Reutilization Marketing Office at Meade. It
> > released 5 of these units worth $1500 each, dated 1-29-98, ship from
> > H98231 (in HTID number above) to SX1213 (marketing office?).
> > Somewhere I'd heard that these units were for locating times on tape
> > recordings of intercepts. The different filter frequencies are for
> > different tape speeds, from high speed search to fine positioning.
> > The code might be IRIG but it could just as easily be something the
> > NSA invented for the purpose.
> > I bought it because I'd visited the NSA museum at Fort Meade and seen
> > the code breaking machines. I didn't find them intimidating at all.
> > The gift shop would sell me a jacket with NSA logos, but I didn't
> > know where I would wear it. There is a certain cachet to having a
> > box that was used by top secret agents to decode radio intercepts.
> > Bill Hawkins
> > P.S. I'd recommend doing some signal tracing from the Input connector.
> > We have no idea what signal levels were used, if it wasn't IRIG. I
> > never found time to do that.
> > -----Original Message-----
> > From: ed breya
> > Sent: Sunday, December 11, 2011 2:12 PM
> > I looked at your first post again and noticed there were apparently
> > lots of TTL circuitry, so it could be an IRIG code receiver, and you
> > should be able talk to it. If you don't have a source readily
> > available, you may be able to fool it into responding a little to
> > gibberish applied from a modulated signal generator, just to see if
> > it's functional.
> > Ed
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