20
GPS Antenna and Cable Information
4.2
Verifying Antenna and Cable Operation
A two-color operate LED, located at the base of the antenna, indicates proper antenna operation.
GREEN indicates proper operation (i.e. the antenna is getting the correct voltage); AMBER
indicates improper operation (i.e. the voltage is low).
4.2.1
Checking the Antenna Voltage
The GPS clock pr5 Vdc to the GPS antenna, which is carried through the antenna cable.
Nominal antenna current is 13 mA. Check the voltage at the antenna connector on the rear panel.
Without the signal, the antenna and the GPS clock will not synchronize with the Global Positioning
System and can generate an out-of-lock alarm, if the Out-of-Lock feature is enabled.
4.2.2
Power Supply Check
The Antenna Voltage test (above) actually tests the main power supply voltage for all models of
clocks. This signal should be between 4.9 and 5.1 Vdc.
4.2.3
Checking the Antenna Resistance
Checking the internal resistance of the Arbiter GPS antenna is not as useful as verifying the antenna
operation mentioned above. Antenna resistance measures several megohms with meter probes at
one polarity and less so if you change the meter probe polarity.
4.3
GPS Surge Arrester
Figure 4.4 illustrates the GPS surge arrester kit (P/N AS0094500), which is mounted in line with
the antenna cable. The surge suppressor has two female F connectors, which are bidirectional, and
two ground lugs with hardware for connecting to a solid ground.
Antenna
Receiver
Surge Arrester/Grounding Block
AS0094500A
Figure 4.4: GPS Surge Arrester
4.3.1
Using the GPS Surge Arrester
Before installation, review the documentation on this device found in Appendix B. The AS0094500
surge arrester is weatherproof except for the F connectors, which may be sealed with rubber port
seals or GE Silicone II compound.
Summary of Contents for 1084A
Page 4: ...iv ...
Page 6: ...vi ...
Page 18: ...xviii LIST OF FIGURES ...
Page 24: ...4 Unpacking the Clock ...
Page 36: ...16 Connecting Inlet Power Input and Output Signals ...
Page 44: ...24 GPS Antenna and Cable Information ...
Page 114: ...94 Startup and Basic Operation ...
Page 123: ...B 4 Physical Dimensions 103 Figure B 1 Suggested Mounting of the AS0094500 Surge Arrester ...
Page 124: ...104 Using Surge Arresters ...
Page 134: ...114 Options List C 6 2 Option 06 Firmware Setup Figure C 3 Option 06 Firmware Setup ...
Page 142: ...122 Options List Figure C 5 Option 06 Output Jumper Settings ...
Page 158: ...138 Options List Figure C 13 Option 17 Board Layout and Jumper Locations ...
Page 163: ...C 13 Option 20A Four Fiber Optic Outputs 143 Figure C 14 Option 20A Jumper Locations ...
Page 170: ...150 Options List Figure C 16 Option 23 Internal Jumper Setup ...
Page 172: ...152 Options List Figure C 17 Option 27 Jumper Locations ...
Page 190: ...170 Options List Figure C 20 Option 29 Connector Signal Locations ...
Page 246: ...226 Options List ...