APPENDIX C
GPS OPTION 08CE 10-37VDC DUAL POWER INPUT
ASSEMBLY 100002
1.0 INTRODUCTION
This option provides the ability to use one of two DC sources to power the GPS TC&FG.
1.1 FUNCTIONAL EXPLANATION
Two separate DC inputs labeled J1A and J2A and a On/Off switch are located on the rear of the
unit. These inputs are routed through the switch, separate fuses and bridge rectifiers, and
connected together to the input of a single DC/DC converter. This DC/DC converter supplies +5
and +/-12VDC to power the unit.
Because the two DC inputs are routed through bridge rectifiers, the individual input pins are not
polarity sensitive. Because the outputs of the two bridge rectifiers are connected together to
form the input to the DC/DC converter, which ever input is the higher DC voltage will power the
unit. If the higher DC input is lost (or not present), the other DC input will power the unit.
1.2 SPECIFICATIONS
Input Voltage/Current: +10VDC to +37VDC.
Approximately 1.5 amps @ +10VDC.
Approximately .5 amps @ +37VDC.
Note: The input current is dependent on the number of options installed in the GPS
TC&FG.
Internal Fuses: F1 protects DC input from connector J1A.
F2 protects DC input from connector J1B.
Fuses are 4 amp, slow blow, 5x20 millimeters (located on Assembly
100002).
C-18 ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
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