Chapter 4 GPS Antenna Feeder System
Index name
Index Specification
Rain-proof
air-sealing
Material of antenna shield
UPVC
weight
450 g
Support tube dimension
Φ27 mm x 300 mm
GPS Feeder
Functions
The
GPS
feeder performs following functions:
�
Connects the GPS antenna with the clock module.
�
Transmits signals received by the GPS antenna to the clock
module for proper processing.
�
Transmits the DC 5 V power generated by the clock module to
the GPS antenna as the working voltage.
�
PE insulation impedance is 50 ohm. It is one-layer bare copper
braided shielded.
Structure
When the GPS feeder length is less than 100m, 1/4" RF coaxial
cable can be used. 1/4" RF coaxial cable appearance is shown in
Figure 54
F
IGURE
54 GPS F
EEDER
S
TRUCTURE
1. Cable core
2. Shield cover
3. Insulating layer
Technical Indices
Table 38
lists the technical indices of GPS feeder cable.
T
ABLE
38 GPS F
EEDER
C
ABLE
T
ECHNICAL
I
NDICES
Technical Parameter
Index Scope
Name
1/4″ foam polyethylene insulation wrinkle
copper tube external conductor RF coaxial
cable.
Characteristic impedance
50 Ω
Inner conductor calibra-
tion outer diameter
2.6 mm.
Insulation layer calibra-
tion outer diameter
6 mm.
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