Kinemetrics 468-DC-MRS Service manual

TRUETIME
OPERATING AND
SERVICE MANUAL
"MODEL 468-DC-MRS"
Satellite Synchronized Clock
,.
0
... '.,.,,
".,·.: .. i
.:i -~' ' • ~7 l • "; • "l
_j ,_ I • _j l I ~J - • "j .)
NB,$, TIME
KINEMETRICS/TRUETIME: 3243 SANTA ROSA AVE., SANTA ROSA, CA 95407 [phone] -TELEX 176687 -FAX [phone]
MANUAL DATED 10/86

~
KINEMETRICS
"References in
this manual to:
468-DC
A-468MS
A-468RK
KINEMETRICS I TRUETIME
3243 Santa Rosa Ave.
Santa Rosa, CA 95407
May be
replaced 'by:
468-DC/MM
A-468MS/RK/MM-2
A-468RK/MM-2
11

TRUETIME
KINEMETRICS
MARTIN MARIETTA CORPORATION
SAT .RS OP..DER NO.
In 1982 Kinemetrics/TrueTime redesigned the Models A-468MS/RK and
A-468RK GOES antenna system. The newer MK II version of the
Model A-468MS/RK has a different circuit card and has different
dimensions than the MK I. The MK II antenna is still compatible
with the MK I Remote Kit, and the MK II Remote Kit is still com-
patible with the MK I antenna as far as function is concerned.
The MK II version of the Remote Kit also has a different circuit
card and different dimensions.
When we supplied GOES antennas to Martin Marietta in 1984, we
were able to remanufacture MK I kits from resources that were
still available to us. Those resources are no longer available.
Producing MK I antennas at this point in time would entail an ex-
tremely prohibitive expense for Martin Marietta. The MK II GOES
antenna system is now the only version available to us. However,
we can still accommodate Martin Marietta van application by
providing a special adapter plate to be installed on the MK II
Remote Kit. This plate will allow the user to interchange both
MK I and MK II Remote Kits. Both units
as far as input/outputs are concerned.
are
The mounting holes in the antenna pedestal baseplate have been
drilled out to 0. 459", and the upright mounting stanchion has
been shorted to 9.5" to conform to Martin Marietta Drawing No.
850MROR0026. Applicable drawings follow this page.
KINEMETRICS/TRUETIME: 3243 SANTA ROSA AVE., SANTA ROSA, CA 95407 [phone] -TELEX 176687 -FAX [phone]

ITEM
-l
2.
3
4
5
6
7
8
9
·468DC-MRS SYSTEM DESCRIPTION
PART NUMBER
468~DC MM
A-468MS/RK MM 2
A-468RK MM
A-468Br/MM
A-468 MM - 1.5
A-468 MM -20
A-468BC/MM
A-468AP1/MM
A-468PP1/MM
DESCRIPTION
GOES Satellite Synchronized Clock
GOES Antenna Mark II
Antenna Remote Kit
Base Plate Adapter for Item 3
Cable Assembly 1.5 foot length
Cable Assembly 20 Foot length
RG 214 with "N" Connectors
"N" Bulkhead Connector
Paint Code 17925 for Item 2 (White)
Paint Code 17925 for Item 4 (White)
WARRANTY INFORMATION:
The Kinemetrics/TrueTime design of the 468-DC-MRS is considered proprietary.
Kinemetrics/TrueTime's Santa Rosa factory is the only facility authorized to
perform warranty repairs. This warranty is transferable from Martin Marietta
to their end user. Refer to pages 1 through 3 of this manual for additional
details.

APPENDIX •A"
PAGE
DESCRIPTION
1 468-DC{MM ·
2 A-468MS/
~MM
3 A-468RK/MM· ·
4 A-468 BP/"· MM·

<
T
~
.22 TYP
MODEL 468-DC/MM
GOES SATELLITE CLOCK
10.00 MAX
"'

TO A-468RK/MM-2
REMOlE KIT
"N• CONNECTOR
~Annc-1 /\_.A~QU~ /DLt lt..At..A-?
IVIVLJLL I\ IVUIVl....J/ l'I'/ 1v11v1 '-
GOES ANTENNA
WITH MOUNTING HARDWARE

TO 468-DC/MM
·aNc· CONNECTOR
FROM A-468MS/RK/MM-2
•N• CONNECTOR
MODEL A-468RK/MM-2 REMOTE KIT

• fV\._
··-
.050·
RIVNUTS
(HOLE PATIERN TO MATCH NEW
REMOTE Kil) FITS 5/16• BOLT
ADAPTER 7
r
COUNTERSUNK HOLES PLATE
FOR ATTACHMENT TO VAN
{HOLE PATTERN TO MATCH OLD
REMOTE KIT) FITS 10-32 FLATHEAD SCREWS
10.00· I I
1.00·
0.75•
......_------13.00• -----------4 ....
NOTE: DRAWING NOT TO SCALE
MATERIAL: 1/8• PLATE ALUMINUM, PAINTED
MODEL A-468BP /MM
MK I TO MK II REMOTE ADAPTER PLATE

TABLE OF CONTENTS
SECTION
PAGE
I GENERAL INFORMATION
1-1 INTRODUCTION................................... 1-1
1-7 WARRANTY ....................................... 1-3
1-8 SPECIFICATIONS................................. 1-4
II INSTALLATION
2-1 ANTENNA INSTALLATION ................ ~ .......... 2-1
2-7 RACK MOUNTING.................................. 2-4
2-9 INSTRUMENT START-UP ............................ 2-4
III OPERATION
3-1
3-3
3-7
3-11
3-13
3-16
3-18
3-24
3-26
3-28
3-36
3-41
3-45
3-51
3-55
3-66
3-74
3-75
3-79
3-84
3-88
3-92
3-94
3-97
3-98
3-104
3-106
3-114
3-123
3-125
'"\ 1 '"\ /""\
.)-1.)U
3-133
3-134
3-135
INTRODUCTION .................................. .
SATELLITE EAST-WEST LED ....................... .
DISPLAY ....................................... .
HOURS OFFSET .................................. .
12/24 HOUR CLOCK OPERATION .................... .
AUTOMATIC/MANUAL SATELLITE SELECTION .......... .
PROPAGATION DELAY ............................. .
1 Hz •••••••••••••••••••••••••••••••••••••••••••
1 KHz •.•••••••••••.••••.....•.•.•••••••••••••••
IRIG-B (REMOTE DISPLAY DRIVING OUTPUT) ........ .
SLOW CODE ..................................... .
C..() u~
vu 11~ • •••••••••••••••••••••••••••••••••••••••••
EXTERNAL OSCILLATOR (Option) .................. .
IRIG-H (Opt
ion) ............................... .
PARALLEL BCD TIME OUTPUT (Option) ............. .
RS-232 TIME OUTPUT (Option) ................... .
RS-232 MODE DESCRIPTIONS ...................... .
MODE C ........................................ .
MO DE T •••••••••••••••••••••••••••••••••••••••••
M0 DE F •••••••••••••••••••••••••••••••••••••••••
MODE M ........................................ .
MODE P ........................................ .
MODE R ........................................ .
NOTES ......................................... .
MODE U - DUT1 MODE ............................ .
M
0 DE E. . . . . . . . . ............................... .
I
-MODE -(Opt ion) ............................. .
DAMS/HEALTH MESSAGE SOFTWARE (Option) ......... .
DAMS/HEALTH MESSAGE SET UP KEY STROKESo••······
VERIFICATION KEY STROKES ...................... .
3-1
3-1
3-4
3-4
3-5
3-5
3'.'""5
3-7
3-8
3-8
3-9
3=9
3-10
3-10
3-11
3-15
3-19
3-19
3-19
3-20
3-21
3-21
3-22
3-22
3-23
3-24
3-24
3-25
3-27
3-27
DAMS/HEALTH MESSAGE INFORMATION KEY STROKES .... 3-29
OPERATING NOTES ................................ 3-29
IEEE-488 OUTPUT (Option) ....................... 3-30
INTRODUCTION ................................... 3-30
1

TABLE OF CONTENTS (cont.)
SECTION PAGE
III OPERATION (cont.)
3-137
3-140
3-142
3-146
3-151
3-156
3-158
3-161
3-165
3-167
3-170
3-173
3-177
3-179
HARDWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
EXTERNAL TRIGGER ............................... 3-31
SOFTWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
MODE F ......................................... 3-31
MODE M ......................................... 3-32
MODE N ......................................... 3-33
MODE P ......................................... 3-33
MODE T ......................................... 3-34
SAMPLE PROGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 35
D.C. POWER INPUT (Option) ...................... 3-37
SOus TIMING (Option) ........................... 3-37
DAYLIGHT SAVINGS TIME CORRECTION .......•....... 3-38
RS-232 STANDARD MODES ......................... 3-38
ADVANCED PERFORMANCE OPTION .................... 3-39
IV THEORY OF OPERATION
4-1
4-16
4-17
4-19
4-21
4-26
4-31
4-34
4-36
4-38
4-42
4-47
4-52
4-58
4-61
4-64
4-68
4-71
4-75
4-77
4-81
4-84
4-87
4-90
4-102
4-103
4-105
4-107
4-119
THEORY OF OPERATION MODEL 468-DC .............. .
DETAILED DESCRIPTION OF OPERATION ............. .
ACTIVE ANTENNA ASSEMBLY 86-170 ................ .
PRE - AMP LIF IE R. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lST L.O. MUL'NPLIER/MIXER ..................... .
INTERMEDIATE FREQUENCY AMPLIFIER .............. .
DETECTOR BOARD ASSEMBLY 86-73 ................. .
ANALOG BOARD ASSEMBLY 86-74 ................... .
RF LOCK DETECTOR .............................. .
RF LOCK LOOP .................................. .
DATA DETECTOR ................................. .
DATA LOCK DETECTOR ............................ .
COARSE PHASE LOCKED LOOP .......•...............
FINE DATA PHASE LOCKED LOOP ................... .
EXTERNAL OSCILLATOR INPUT (Option) ............ .
TIMING CHAIN ..........................•......•.
DIGITAL BOARD - ASSEMBLY 86-42 ................ .
POWER SUPPLY - ASSEMBLY 86-52 ...............•..
DISPLAY BOARD - ASSEMBLY 86-43 ....•............
PARALLEL BCD TIME OUTPUT (Option) - ASSY. 86-44
RS-232 INTERFACE (Option) - ASSEMBLY 86-46 .....
DAMS/HEALTH MESSAGE (Option) ..................•
IEEE-488 INTERFACE (Option) - ASSEMBLY 86-47 .. .
D.C.
POWER INPUT (Option) ..................... .
SOFTWARE ...................................... .
PROGRAM DESCRIPTION ........................... .
RECEIVER CONTROL AND DATA PROCESSING .......... .
DESCRIPTION OF THE STATE DIAGRAMS ...•........•.
TIMING OUTPUTS ................................ .
2
4-1
4-6
4-6
4-6
4-6
4-7
4-8
4-8
4-8
4-8
4-9
4-11
4-13
4-14
4-15
4-16
4-16
4-17
4-17
4-17
4-18
4-18
4-18
4-18
4-20
4-20
4-20
4-20
4-26

V MAINTENANCE AND TROUBLESHOOTING
5-1 MAINTENANCE MODEL 468-DC ....................... 5-1
5-4 THIRD I.F. TRIM - AS~EMBLY 86-73 ............... 5-1
5-8 DATA SYMMETR~ ADJUSTMENT - ASSEMBLY 86-74 ...... 5-2
5-10 EAST SWEEP TRIM - ASSEMBLY 86-74 ............... 5-2
5-12 WEST SWEE? TRIM - ASSEMBLY 86-74 ............... 5-3
5-14 10 MHz FINE TIMEBASE TRIM - ASSEMBLY 86-74 ..... 5-3
5-16 1 MHz COARSE TIMEBASE, ASSEMBLY 86-74 .......... 5-3
5-18 FIRST LOCAL OSCILLATOR PEAKING, ASSEMBLY 86-74. 5-3
5-22 TROUBLESHOOTING ................................ 5-4
5-49 TROUBLESHOOTING THE EXTERNAL OSCILLATOR (Opt.). 5-8
5-51 TROUBLESHOOTING THE D.C. SUPPLY (Option) ....... 5-8
VI SCHEMATICS AND PARTS LISTS
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
6-12
6-13
6-14
6-15
6-16
6-17
6-18
6-19
6-20
6-21
6-22
6-23
6-24
6-25
6-26
6-27
6-28
6-29
6-30
6-31
6-32
6-33
PARTS LOCATION - ASSEMBLY 86-170 .............. .
SCHEMATIC - ASSEMBLY 86-170 ................... .
SYMBOL DESIGNATION REFERENCE 86-170 ........... .
PARTS LOCATION - ASSEMBLY 86-173 .............. .
SYMBOL DESIGNATION REFERENCE 86-173 ........... .
SCHEMATIC - ASSEMBLY 86-173 ................... .
PARTS LOCATION - ASSEMBLY 86-73 ............... .
SYMBOL DESIGNATION REFERENCE 8r ~1 ............ .
SCHEMATIC - ASSEMBLY 86-73 .................... .
PARTS LOCATION - ASSEMBLY 86-74 ............... .
SCHEMATIC - ASSEMBL'- 96-74 .................... .
SYMBOL DESIGNATION R~iERENCE 86-74 ............ .
PARTS 10CATION - ASSEMBLY 86-42 ............. .
SYMBOL DESIGNATION REFERENCE 86-42 ............ .
SCHEMATIC - ASSEMBLY 86-42 .................... .
PA~TS LOCATION - ASSEMBLY 86-43 ......... ~- ..... .
SYMBOL G:SIGNATION REFERENCE 86-43 ............ .
SCHEMATIC - ASSEMBLY 86-43 .................... .
PARTS LOCATION - ASSEMBLY 86-44 ............... .
SYMBOL DESIGNATI0N REFERENCE 86-44 ............ .
SCHEMATIC - ASSEMBLY 86-44 .................... .
PARTS LOCATION - ASSEMBLY 86-46 ............... .
SYMBOL DESIGNATION REFERENCC 86-46 ............ .
SCHEMATIC - ASSEMBLY 86-46. , ................ .
PARTS LOCATION - ASSEMBLY~: -47 ............... .
SYMBOL DESIGNATION REFERENCE 86-47 ............ .
SCHEMATIC - ASSEMBLY 86-47 .................... .
PARTS LOCATION - ASSEMBLY 86-52 ............... .
SYMBOL DESIGNATION REFERENCE 86-52 ............ .
SCHEMATIC - ASSEMBLY 86-52 .................... .
PARTS LOCATION - ASSEMBLY 86-147 .............. .
SYMBOL DESIGNATION REFERENCE 86-147 ........... .
SCHEMATIC - ASSEMBLY 86-147 ................... .
3
6-2
6-3
6-4
6-6
6-6
6-7
6-8
6-8
6-9
6-10
6-11
6-12
6-14
6-14
6-15
6-16
6-16
6-17
6-18
6-18
6-19
6-20
6-20
6-21
6-22
6-22
6-23
6-24
6-24
6-25
6-26
6-26
6-27

VI SCHEMATICS AND PARTS LISTS (cont.)
6-34 PARTS LOCATION - ASSEMBLY 86-53 ................ 6-28
6-35
SYMBOL DESIGNATION REFERENCE 86-53 ............. 6-28
6-36 SCHEMATIC - ASSEMBLY 86-53 ..................... 6-30
6-37 REAR PANEL ASSEMBLY 220-30 ..................... 6-31
6-38 PARTS LIST 220-30 .............................. 6-31
6-39 SUBCHASSIS ASSEMBLY 221-30 ..................... 6-31
6-40 PARTS LIST 221-30 .............................. 6-31
6-41
MODEL 468-DC FINAL ASSEMBLY 151-70 ............. 6-32
6-42 PARTS LIST 151-70 .............................. 6-32
6-43 MODEL A-468MS FINAL ASSEMBLY 142-170 ........... 6-33
6-44 PARTS LIST 142-170 ............................. 6-33
6-45 MODEL A-468MS SUB-ASSEMBLY 141-170 ............. 6-33
6-46
PARTS LIST 141-170 ............................. 6-33
6-47 MODEL A-468HX SUB-ASSEMBLY 141-171 ............. 6-34
6-48 PARTS LIST 141-171 ............................. 6-34
6-49 MODEL A-468HX FINAL ASSEMBLY 142-171 ........... 6-34
6-50 PARTS LIST 142-171 ASSEMBLY 142-171 ............ 6-34
6-51 A-468 ANTENNA SYSTEMS .......................... 6-35
VII ANTENNA INSTALLATION FOR MODELS A-468MS, A-468HX,A-468RK,
A-468Rtc, EXTERNAL ANTENNA INPUT
7-1 GENERAL INFORMATION ............................ 7-1
7-4 MODEL A-468MS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7 -9 I NS TALLA TI ON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7- 3
7-10 MODEL A-468HX.................................. 7-3
7-14 INSTALLATION................................... 7-4
7- 15 M0 DEL A-468 RK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
7-
21 M0 DEL A- 468 RK C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7-27 EXTERNAL ANTENNA INPUT ......................... 7-8
VIII IRIG-B AND IRIG-H TIME CODE FORMAT
8-1 INTRODUCTION................................... 8-1
8-4 IRIG CODE FORMAT ............................... 8-1
8-11 CONTROL FUNCTIONS .............................. 8-2
4

SECTION I
GENERAL INFORMATION
1-1
INTRODUCTION
1-2 This manual has been designed and written to provide
the owner of the Model 468-DC 'GOES' Satellite Synchronized Clock
r.1 ; t- h a 1 1 /"\ f f- h o rt !l t- !l !l n rt ; n f /"\ r m !l t- ; /"\ n n o o rt o rt t- /"\ /"\ no r !l t- o !l n rt 1 1 f- ; -
VY ...L. '- L J \.A ..L ..L '-J .L. '- L J "- ..._... '-" '- \.A \.A L J. '"4 ..&.. .L J. .L ..._,, .L l..l.J. \.A '- .L '-J L J. 1. .I ""-'" '- ..._... '- "-& '- .._,. '-' t' """" .L. '-" '- "-' \.A L J. '-.& \A '- ..L
lize all its features.
1-3 The information included in this manual is as complete
as possible and includes normal maintenance and adjustment data
that may be required to facilitate field repair of the unit.
1-4 The Model 468-DC has been designed to receive the NOAA
"GOES" Satellite which transmits on a frequency of 468 MHz and
decode the time information from the broadcasts as well as dis-
play outputs for supplying the time information to other equip-
ment. The Synchronized Clock in its standard configuration pro-
vides a front panel display of days, hours, minutes, and seconds
with five rear panel BNC connectors with IRIG B, 1 Hz, 1 kHz,
Precision 60 Hz, and Slow Code locked to the electrically output-
ted time (and options if ordered), may be in either Universal
Coordinated Time (UTC), more commonly referred to as Greenwich
Mean Time (GMT), or in local time. This is done through the
proper time zone offset selected by the rear panel thumbwheel
switches. The Model 468-DC is shipped to display the time of
year in the twenty-four hour format. By simply removing the
cover and switching the position of the small switch on the
microprocessor circuit board, the unit can be converted to dis-
play and output time in the more conventional twelve hour format.
1-5 This instrument has been designed to be completely
automatic requiring only antenna installation and connection of
the unit to the power source. Once the instrument is installed
and turned on, the microprocessor will lock to the signal from
the "GOES" Satellite (either East or West Satellite by sweeping
for lock), decode and display the time. From that point on, the
unit will require no further attention and will provide time to
an accuracy of +1.0 ms, continually updated by and phase locked
to the transmissions of the "GOES" Satellite. In the event of
loss of signal, the unit will continue operation on its internal
crystal time base. If power should fail, upon restoration, the
unit will again read the time signals and start displaying the
time transmitted.
1-6 The Model 468-DC Satellite Svnchronized Dis:dtal Clock.
when using the A-468MS Antenna, is gu~ranteed to op~rate ~t any
location within the 5° viewing angle of the satellite as shown on
the map enclosed. For viewing angles of 0° -5° the Model 468-HX
should be utilized.
1-1

150° 180° 150°
120°
900
~o ~o ~
EAST WEST +IN-ORBIT
SPARE LOCATED AT 105° W
FIGURE 1-1
GOES SATELLITE COVERAGE MAP
1-2

1-7
WARRANTY
KINEMETRICS/TRUETIME warrants each
instrument it manufactures to be
free from defects in material and
workmanship for a period of one
year from the date of delivery to
the original purchaser. Under this
warranty, any instrument which is
returned to us (freight pre-paid)
and is found by us to be defective
in material or workmanship will be
repaired or replaced (at our op-
tion) at no charge to the customer
and returned freight pre-paid.
Our obligation under this warranty
is limited to servicing or adjust-
ment of any instrument returned.
Items not covered by this warranty
are: fuses, batteries, and any
illuminated parts or damage caused
by accident or physical destruction
of the instrument.
This warranty is expressly in lieu
of all other obligations or liabil-
ities on the part of TrueTime.
TrueTime neither assumes nor autho-
rizes any other person to assume
for them any other liability in
connection with our sales.
1-3

1-8 SPECIFICATIONS
RECEIVER FREQUENCY:
SYSTEM SENSITIVITY:
SYSTEM NOISE MARGIN:
TIMING ACCURACY:
PROPAGATION
DELAY CORRECTION:
TIME BASE STABILITY:
DISPLAY:
DISPLAY ACCURACY:
NOMINAL TURN-ON TIME:
OPERATING TEMP:
1-4
468.8250 and 468.8375 MHz Automatic or
Manual select.
The sensitivity is suitable for proper
operation with satellite viewing angle
5° or more above the horizon when using
the A-468MS Antenna. (approximately
.2uV/m)
Operates with 9db attenuator inserted
between A-468MS flat plate and preamp
input in locations which have a satel-
lite elevation of greater than 15°.
1)
+1.5 ms of UTC/NBS Time when cor-
rected for propagation delay
through on-board switches and using
the A-468MS Antenna.
2) The time difference between neigh-
boring clocks locked to the same
satellite is considerably improved
over UTC timing accuracy. Consult
the factory for specification and
conditions.
Two internal decade switches provide
+50 ms correction capability in 1 ms
steps.
When not phase locked, crystal controls
to +l x 10-6.
For higher stability time base when not
phase locked to satellite, see "External
Oscillator Input" Option.
1/2" high planar gas discharge.
plays day of year, hours, minutes
seconds.
Dis-
and
-0 to +100 ms, anytime colons are not
flashing.
Three minutes from power on and
reception with 90% confidence
average signal conditions.
0° to 50° C.
signal
under

REAR PANEL OUTPUTS:
1 Hz:
1
KHz:
DRM()'l'R f\T ~ DT AV
.l\..LU:J \J ..L .U LI.LU L. .UC:J. .&..
DRIVING (IRIG B):
SLOW CODE:
60 HZ:
EXTERNAL
OSCILLATOR
(Option):
Rising edge on time, drives ten TTL
loads or CMOS. High 10%, Low 90%. See
SECTION III, entitled "l Hz".
Rising edge on time, drives two TTL
loads or CMOS. High 10%, Low 90%. See
SECTION III, entitled "l KHz".
IRIG B Time Code is provided on a rear
panel BNC connector. Standard IRIG B
Time Code is an amplitude modulated 1
KHz carrier. This output can also be
easily field converted to TTL compatible
D.C. level shift time code. See Section
III, entitled "IRIG-B (REMOTE DISPLAY
DRIVING OUTPUT)".
BNC output of 1 pulse per minute (lppm),
1 pulse per hour (lpph), and 1 pulse per
day (lppd). The pulses go high on time
and remain high for 2 seconds for minute
mark, 4 seconds for hour mark and 6
seconds for day mark. Capable of
sourcing 40 MA at 4.0 volts minimum, and
pulled to ground by a lk ohm resistor.
See SECTION III, entitled "SLOW CODE".
Provided on BNC connector as frequency
source to drive a synchronous motor
through a power amplifier.. Capable of
driving 10 TTL loads. The output square
wave has an unusual duty cycle. The 60
Hz is a 50% duty cycle over 50 ms (3
cycles).
Cycle #1
Cycle #2
Cycle #3
High 9ms, Low 8ms
High 8ms, Low 9ms
High 8ms, Low 8ms
See SECTION III, entitled "60 Hz".
Input level of less than 4V and greater
than 2.4 volts (TTL) sine wave or square
wave is required. Any frequency from
100 KHz to 10 MHz in multiples of 100
KHz is satisfactory. No unit adjustment
is needed regardless of frequency. Used
as clock time-base when not phase locked
to the satellite~ See SECTION III.
entitled "EXTERNAL OSCILLATOR". .
1-5

IRIG H (Option):
PARALLEL BCD
TIME (Option):
RS-232 (Option):
I-MODE (Option):
S-MODE (Option):
BNC output of standard IRIG H format TTL
DC level shift supplied unless otherwise
requested. If 1 KHz amplitude modulated
carrier requested, IRIG B will automati-
cally be supplied in D.C. Level Shift
format. See SECTION III, entitled
"IRIG-H (Special Order Option)".
If ordered, Parallel BCD time of year is
provided on rear panel 50 pin "D" con-
nector. Days, hours, minutes, seconds
and milliseconds are provided. Lines
indicating worst-case time error of +l,
+5, +50 and +500ms drives 15 "LST'T"L"
Toads-or 'CMOS': See SECTION III, enti-
tled "PARALLEL BCD TIME OUTPUT (Special
Order Option)".
The High Capacity Parallel BCD drives
100 LSTTL loads.
The displayed time of year is outputted
in EIA Standard RS-232C configuration
via a "Motorola ACIA". Output format is
D D D H H M M S S
and an indicator of the time quality,
CR/LF. Baud Rate and "ACIA" opt ions are
dip switch selectable. See SECTION III,
entitled "RS-232 TIME OUTPUT (Options)".
Time can be preset and displayed without
synchronization to NBS transmissions.
DAMS/Health Message Software. Assists
users of NESS data collection system to
check the quality of uplink transmis-
sions.
IEEE-488 (Option): IEEE Buss interface is also available.
HOURS OFFSET:
1-6
The time is outputted in ASCII format,
with the most significant digit first
(lOO's of days). Among operating modes
is time on demand to the millisecond
level, or marked time to the millisec-
onds level. See SECTION III, entitled
"IEEE-488 OUTPUT (Option)".
•
Rear panel thumbwheel switch allows
adjustment of + or -"O" to "11" hours
from transmitted UTC time. See SECTION
III, entitled "HOURS OFFSET
11 •

12/24-HR. OPERATION: Dip Switch located inside unit allows
use as 12 hour clock in place of 24 hour
format as shipped. See SECTION III,
entitled "12/24-HOUR CLOCK OPERATION".
468-DC SYNCHRONIZED DIGITAL CLOCK
SIZE:
WEIGHT:
POWER (Standard):
D.C. POWER INPUT:
A-468MS ANTENNA
CT7"R.
u.Lu:J.J•
WEIGHT:
A-468HX ANTENNA
SIZE:
WEIGHT:
A-468RK DOWN CONVERTER
SIZE:
WEIGHT:
1-3/4" x 17" x 10-1/2" (4.4 x 43.2 x
26.7cm) behind panel. Mounts in stan-
dard 19" (48.9cm) EIA rack system, hard-
ware included. 24" (60. 9) hardware
available.
7-1/4 lbs. (3.5kg) Ship Wt. 12 lbs.
(5.4kg).
96-135VAC, 60-400Hz, less than 25 volt
amps. Others available on request.
When ordered, the standard AC input is
replaced with binding posts on 3/4"
centers, red is positive, black is nega-
tive. Common "Banana Plugs" can be
used. Input voltage may be 11 vdc to 32
vdc. Power is approximately 20 watts
depending upon option.
10" x l 0
II
(25.4 cm x
hi oh
•• ~b ..
25 .. 4 cm x 30.5
cm).
10 lbs(4.5 kg) Ship Wt. 16 lbs.(7.3kg.)
17" x 17" x 43" high (4'.1.2 cm x 43.2 cm
x 109 cm) Provided with a universal
mounting system and hardware.
22 lbs (10 kg) Ship Wt. 66 lbs. (30 kg)
10 .. x 13" x 2.4" (2.54 cm x 33.0 cm x
6. 1 cm) .
10 LBS (4.5 KG) Ship Wt. 16 lbs.
(7 1. lro'i
' , • ...,,, .. ~b ,/ •
1-7