Unlimited Release

A Panel Mounted Time Code Reader

Richard L. Shaum

D.1 I:d.iliU'.nON OJ!' 1H1S DOCUA'lliNT ~ UNLaUTEQ

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This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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1 2

SAND77-ll96 Unlimited Release

Printed February 1978

A PANEL MOUNI'ED TIME CODE RF...ADER

Richard L. Shaum Precision Graphics & Maintenance Di vj E-ion 9621

Sandia Laboratories Albuquerque, New Mexico 87115

The time code reader described in this repo.rt is composed of an asserrbly of conmonly available electronic components logically arranged to minimize component count while reliably achieving the basic function of decoding and displaying the time of year information which is available in each of several standard Inter Range Instrumentation Group (!RIG) time codes. The time code reader omits all subsidiary functions of the coce except that of retrieving a readable time of year (day, hour, minute, second). The reader can be mounted on any equipment panel having an available flat surface that is 2 by 6 inches in dimensions. IRIG time codes A, B, E, and G can be read without the neceEsity of switching, and a relatively wide range of input voltages is accommodated.

' NOTICE----·

. This report was prepared as an account of work sponsored by the United States Government. ::~rt ~~ United States nor the United States Oep f their Ene gy nor any of their em})loyeet, nor any o con;ra~tors, sub..:unlrllcton, nr. their employees, ~e~ any warranty' express o.r imphed, or assu~:~m;:teness liability:or responsibility for the accuracy, p or Ulltlful!,,..n nf llP.Y information, apparatus, prod~ct o~ process dm:tOsed, or represents that tu WCI won no infringe privately owned rights.

DtSriHBU~lON OF T·HJS DOCUMF.NT 1J! UNLIMITED~ 3-4

A PANEL M:XJNTED TIME CODE RFADER

Introduction

The common use of Inter Range Instrumentation Group (IRIG) time codes

throughout the national test ranges and laboratories has brought to the

market a large variety of time code reading equipment. Generally, such

equipnent provides many options which are not directly related to simply

observing the time. These options increase the price of the equipment. It

is believed that there are many people who do not want these various

options but require simply a reliable display with which to visually

monitor the time. The device described in this report performs this

function and is both simple and economical (Figure 1) •

f) -

Figure 1. Time Code Reader 1-Dunted on Panel of a Time Code Reciever

5

6

Description of the Panel Mounted Time Code Reader

'rhe time code reader descr ibec1 herein is composed of an assembly of

commonly available electronic components (Figure 2) which are logically

arranged so as to minimize their number while re.1 iability achieving the

basic function of decoding and displaying the time of year information

which is available in each of several standard IRIG time codes (Figure 3).

These time codes are in use at present at national test ranges and

laboratories throughout the world.

Figure 2. Time Code Reader Components

TIME FRAME 0. 1 SECOND 10 20 30

INDEX COUNT (MILLISECONOSJ

40

SECONDS r___.....___, 100 200 1 . 2 .4 .8

so

IUl~ PS

70 80 90

L Ps P9 Tt"'• of tk ts potnt equal s 173 day, , 21 louun., 16 ltun. , 4.l,IJI~ ;:ecs.

3.JX X

TYPICAL MODULATED CARRIER Ref'"ornmended Frequency 10,000 Hl

10

- --- REF. TIMe'

TIME FRAME 1 SECOND 20 30

IN DE X COUNT (0 .0 I SECONDS)

l -- REF. MARKER

SECO NDS MINUTES HOURS

~~~~ I II lfl II n.Wl JLJ l.J lf1 Jl flJ lfl n fUULJlfUU..JlJJUUW PO I I .JL.;IN1~~ ·o · P211 SMS P3

~ r-- SMS II ~TYPICAL ) ~ hNARY ' I '

50 60

.1 SEC. INOE '(MARKER

.01 SEC. INDEX MAR KER

TYPICAL MOOULAl'EO CARRIER Aecommen41!d Fr•q~o~ ~rr,cy , 1000 Hr

{TYPICAL )

70 80

Code A

40

DAY

90

Code B

Figure 3. !RIG Standard Time Codes A, B, and E

50

7

8

5.0

1.0

Rt:FE RENCE MAR K(R

1r- PI

0.02 SEC. BINARY ' 0 ' (TYPICAL)

6 .0

I SEC. IN DE X MARKER U.1 SEC. INDEX MAR KER

P6

TIME FRAME 10 SECONDS

2.0 3.0

INOE X COUNT 0. 1 SEC.

~2~

7.0

PI

0.05 SEC. BINARY ' 1' (TYPICAL )

PJ

8.0

-...j ~ 0.08 SEC. POSITION IDENTIFIER

....... (T YPi r AI 1

~

,tt+ TYPICAL MOOUI ATFO CARRIER

Re commended Frequenc:y 100 H1 or 1000 H,

4.0

-.I ~ 0. I SECO~~ I I (TYPIC AL )

9.0

Code

Figure 3. (Continued)

5~0

E

Devices designed for the purpose of displaying time codes generally

include features not required in most display ayplications (e.g., error

hy-pass, automatic gain control, parallel outputs). The time code reader

described in this report omits all subsidiary fw~Lions of a time code 1~

designed specifically to retrieve a readable time of year (day of year,

hour, minute, second). This has resulted in the following advantages:

1. '!'he reader. has been reducc:d in size snch that it can

be mounted on thl? n11t-~=iide of any equipnent panel

having an available flat surface dimension of 2 by 6

inches.

2. Each of several time codes can be read without the

necessity of switching, and

3. A relatively wide range of input voltages is

acccmnodated.

Operation of the Time Code Reader

Figure 4 is a block ·diagram of the time code reader. The time code is

introduced to the signal splitter which distinguishes between the coded

high cycles and the clock signals~ This is accomplished by a resistor

divider which, in the·case of the clock amplifier, biases its inpUt so that

a zero crossover approxtmation is achieved. This amplifier is a schmitt

trigger inverter, and thus the output is free of "bounce." The data

channel operates in the same manner except that a higher level input i~

required to t'rigger the amplifier; it thus outpiJtS only those canponents of

the input signal which are termed "high cycles ...

Time Code Input

Signal Splitter

Clock

Sync.

High Cycles

Strobes 1 2 3 4 5

Counter

0

~

2

3

4

5

Shift 6 Register 7

8

Data

---.---,

I

6 or 9 Digit Latching Display

\..._ ~- - - -- ~ - _.J

Figure 4 ·• Block Diagram of Time Code Reader

The.clock signal is fed into a counter; causing it to increment once

per incoming cycle. The counter is synchronized to th~ incaning code by

the use of certain high cycles which are included in the code for that

purpose. The counter outputs an index count (clock 10) which causes a

shift register tq process the inoaning high cycle data to provide 1/10

frame in parallel form to a display matrix. The counter al$0 outputs a

signal to a time decoder which provides output pulses which are timed to

strobe data from the shift registe~ into a latching display.

9

10

The time and data matrix generated is canposed of five strobes ancl

nine (;ata lines, which are the signals r€qui red to recover time of year

data from the code. The time/data matr:ix is now w~ed to enter decoded

information into each of nine latching numerical display cevices in a

ripple update mode.

Utility of·the Ti.me Code Reader

The sync system is designed to accorranooate IRIG code formats A, 13, E,

and G. Synchonization occurs in :tess.than two frames of coC!e.

'I'wo·models of reeKier h~ve been designed: (1) the CI(...,T33896 (FigureB S

and 6) displays day of year (three digits), hours (two digits), minutes ·

(two digits), anc; seconds (two djgits); an(l (2) the T-46.41.6 (Figures 7 and

8), in which the day of year display is anitted and a switch may be

substitut~1 to transfer the hours and minutes displays. to the day or year

code \>.>hen desired.· Thus, the T...,46416 eliminates three digits without

eliminating the function. A typical container is depicted in Figure 9.

The PC board is simply mounted by the use. of silicone rubber in. each co~;ner.

There are many ana varied appllt:dlluns fc1r thi:J t:imc ooda rGade;:-. At

the Tonopah Test Range it !s being u~~u wllb a ~t~rco c.:lOcctta to recor,t:'l

aircraft communication on one track (voice actuated) and the IRIG-B time

coc1e on the ot11er track. In the event of an unus1,1al circumstance (such as

an accident), the tape can by playec1 back and the time is monitoreC!

directly frcm the recorder while one listens to any message (s) that may

have preceded the accident. The economy of construction suggests its use

in liel,l of parallel type remote displays which require expensiv¢ cabling.

Printed circuit masters for the time code reader can be obtained by

contacting Division 962L.

'l'he power and input requirements aJ;e as fol!CA-IS:

Pao~er: + 5 Vee @ 1 amp (supplied externally)

Signal: 6 VPP referred to grounc (500 Z)

11

...... N

-.....

I I

A. ..c. Jill"'•• V•J.

, •• JC

•••• lr:a..

~

~~ ..... =· ~i SI1W ~ •• ..... ~~ -- ~~ uuu.

~· I ... ~ -

r---"~;:. :J 'I

• I ·- c ' r I _l i I~ -.

& Jj I I fl q N~ ~

~ ~ L"l 71 • 7 f •_t_ ~_I_ ~s.~LJ67' .. s .... , ... ltlt7lff67

ll , 'W II 1IUS ~ 11.1·1·1 li.IOi(l ~) • UIU,) .. e£iS,} JI.IOe ~ I~ Ill . ,. ;;,.I

~(I;~ ht)JO! b"'o .I, .. I 1 I I .a I

v .....

·f '- Lf 1'.~~ I

~ l .Ll

I T -:-

~ .~ , •.. liT .,..... _,. I l ./1~ ., ~ ..... M6 ,, I '

.llr.. ~) ,, ..... ....

Lf~· I'T ..t

s.&tr J

Mlii,

ll.iL " • ~~ cD •

:?igure S.. Schematic of Nine Digit Time ·Code ReE-der (C1{-1'38896)

I

1. "

6.8K 3.6K

~------------------ 5 .. 7" -----------------~

Figure 6. Printed Circuit Board for Nine Digit Time Code Reader

' ~ J I I II I. I 1 l I I I I :a • I

J.U:: I I

.a I ' .....=:::w (J) \. ~~ f &JI a•T J,

.~... ~ ~~rT 1ti-----1L-+1---..._--11--+-f---+-+-+-+......_H-++--il-+~ ~~ IlL 1 •I! .a•JL:t llrr. ••t---'&.....,:----+-11--+-t--:-+-t-t-+-H-++---i~

~--~~~-}------~~+1._ ________ ~---LSt~~;@~::

I .... ~

~ .&J.T ·,.,____.s--.-------:--H-++-----4-++6-----+~ ~o>tlfT l,,,__..a....._,I ______ +H-----+--i~------'< ..... UA. ,,__,_ • .-------4~------+...._ _____ ...J

• ~-~~~~~~,--------._------~ I I

/LH

· lCON

Figure 7 •. Schemat:ii.c ·of Six Digit Time Code Reader (T-46416)

1 8"

Cut paths ·before installing switch

Hours

U6 us U4

U8

~---Com · :.,._ ___ + 5 v :...----Code Input

:t.....,~---3.6K

~--~~~~~~~----6.8K

U3 U2 Ul

._ ... __________ 4.1" -------....,..-----4

Figure 8. Printed Circuit Board for Six Digit Time Code Reader

r~ .1 R

t 1.80

j_ D

· S·:ale = 1:1 inches Mat' 1 - Alum or Mild St. Finish - Flat black .

{,\Type 90 = \VType 60 =

4.411

2.911'

0 H.ole for DAYS .switch on typ~ 6!)

t

Weld and contour corners

Fig~re 9. Typical Container for Time Code R~ader

1

.150 D

DISTRIBUTION:

White Sands Missile Range (3) White Sands ~lissile Range, NM 88002 · Attn: Q. M. Flint

CCNC-TWS-E

lliO J. D. Kennedy ll20 G. E. Hansche (3) 1130 H. E. Viney (5) ll31 B. G. Edwards 1240 H. M Dumas. (2) 2160 c. 13. McCampbell 2320 K. Gillespie 2330 D. M. Olson 2510 D. H. Anderson 2552 R. A. Erickson 4300 R. L. Peurifoy, Jr. (5) 5210 J. B. Gerardo 5230 M. Cowan 5240 G. Yon as 5310 w. D. We art 5320 J. R. Banister 5410 D. J. McCloskey 5420 J. v. Walker 5430 R. M Jefferson 5450 J. A. Reuscher 5710 G. E. Brandvold 5730 H. M. Stoller 5740 v. L. Dugan 8300 B. F. Murphey (3) 8410 R. Baroody 9335 D. c. Bickel 9335 w. ·K. Kluesn~r

9400 H. E. · Lenander ·9414 R. K. Peterst;:n 94H G. L. Miller 9420 T. L. Pace 9421 M. J. Navrati~ 9422 G. L. West 9471 R. R. Beasley 9471 K. E. Johnson 9471 D. A. Mayhew 9471 J, D. Tebbs 9472 R. D. Bentley (2) Y472 H. R. Guest 9474 R. N. Schowers 9473 J. D. Patrick 9473 K. J. Datz

·9480 T. s. Church 9481 R. D. Robinett 9482 A. E. Bentz

9482 .9483 9487 9510 9520 9560 9570 9600 9620 9627 9627 8266 3141 3151

K. R. Nielsen W. V. Hereford A. F. Huters W. C. Kraft R. H. Schultz J. R. Sublett R. S. Wilson C. F. Bild R. W. DeVore W. F. Peay R. L. Shawn (5) E. A. Aas C. A. Pepm1,1eller (Actg) (5) W. L. Garner (3) For DOE/TIC (Unlimited Release)

DOE/nC (25) (R. P. Campbell, 3172-3)

17