APPENDIX C
GPS OPTION 23A/23B LIGHTNING ARRESTOR
W/25 OR 50 FOOT ANTENNA CABLE
1.0 INTRODUCTION
This option provides protection of the GPS unit from external over-voltage transients which can
be created through lightning, static discharges, switch processes, direct contact with power lines,
or through earth currents.
The lightning and nuclear EMP arrestors limit the amplitude and duration of the disturbing
interference voltages. Therefore these arrestors improve the over-voltage resistance of in-line
equipment, systems and components.
Note: The antenna cable described in this manual has been replaced as described in “Appendix
D: Antenna Replacement Kit” on page D-1.
The 23A option comes with a twenty-five foot length of 9913 Antenna Cable and the 23B
option comes with a fifty foot length of 9913 Antenna Cable. Both cables have Type N positive
connectors on each end.
This Option may require that the GPS unit to which it is connected have a Bias T Assembly
installed externally. This assembly would furnish a separate +5 volts to power the antenna. See
the Bias T installation procedure furnished with the Bias T.
1.1 SPECIFICATIONS FOR THE 9913 LOW LOSS COAXIAL ANTENNA CABLE
Cable Diameter 0.45 Inches
Center Conductor 10 (Solid) .108 Stranded Copper .90 Ω per 1000 ft.
Shield 90% Tinned Copper Braid.
Attenuation Nominal 5.6 dB per 100 ft at 1.5GHz.
Cable Jacket Black PVC
1.2 SPECIFICATIONS FOR THE LIGHTNING ARRESTOR
Frequency Range 1565 to 1586 MHz
Return Loss > 20dB from 1565 to 1586 MHz
Insertion Loss < 0.5 dB from 1565 to 1585 MHz
Impedance 50 Ω
Connector Type N
ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
C-48
To Next Page
Loading...
Need help?
General
