OPTION DESCRIPTIONS
GPS OPTION 08G 38-73VDC POWER SUPPLY
ASSEMBLY 55194
1.0 INTRODUCTION
This option takes two nominal inputs of 48V through a rear panel terminal strip and provides +5
and ±12 VDC to power the GPS Time Code and Frequency Generator.
All inputs to Assembly 55194 are from rear panel terminal strip TB1.
All inputs have metal oxide varistors for transient voltage suppression.
The pin assignments for TB1 are shown below (as viewed from the rear of the unit):
Figure One
+ – C C – +
Pin Assignments
TB1-1 + 48V (INPUT A)
TB1-2 Return (INPUT A)
TB1-3 Chassis Ground
TB1-4 Chassis Ground
TB1-5 Return (INPUT B)
TB1-6 +48V (INPUT B)
1.1 SPECIFICATIONS
DC Input Voltage Range: DC = 38-73 VDC
DC Input Current (Max.) @ 38V: .6 amps
DC Input Current (Max.) @ 73V: .3 amps
Note: The input current is dependent on the number of options installed in the
GPS TC&FG.
Internal Voltages Generated: +5V, +12V, -12V
Max Current available for above voltages: 5A, 1A, 1A
Max Watts: 25watts
Internal Fuses: F1 protects DC input from Input A.
F2 protects DC input from Input B.
Fuses are 1 amp, fast blow, 5x20 millimeters (located on Assembly
55193).
Symmetricom Inc ET6 ExacTime GPS TC & FG (Rev C) C-21
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