Smiths TRAK 9100

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TRAK MODEL 9100 MODULAR FREQUENCY/TIME SYSTEM

3-2

TM4400013 Rev D

3-2.1. GPS Reference Modules, A1 and A2

The Model 9101 GPS Reference Module front panel is shown in Figure 3-2. Descriptions of the indicators and

test points are given below.

FAULT Red, module fault summation

ON LINE Green, indicates module is the on line reference

STANDBY Green, indicates module is in standby

LOCKED Green, indicates internal oscillator is within ± 400 ns of GPS. At power up and until the

module is locked the indicator flashes, during this time the 1 PPS, 5 MPPS and

Composite signal outputs are muted.

TRACKING Green, indicates GPS is tracking satellites

The Model 9101 GPS Reference Module front panels shown in Figure 3-2 contains the following test points:

1 PPS Module 1 PPS monitor

5 MPPS Module 5 MPPS monitor

COMPOSITE Module Composite monitor

IRIG-B Module IRIG-B modulated time code monitor

GND Ground

Figure 3-2. Model 9101 GPS Reference Module (GPS)

NOTE: GPS Reference modules that contain a front panel fan have an internal Rubidium oscillator. Modules

without the fan contain a crystal oscillator.

GPS REFERENCE

FAULT

TRAK

SYSTEMS

ON LINE

STANDBY

LOCKED

TRACKING

1 PPS

5 MPPS

COMPOSITE

IRIG B

GND

GPS