Chapter 7 Installing GPS Antenna Feeder System
Name
Gain (dB)
SMA male jumper
-2.5
ICM board (ublox-5t receiver)
25.5
ICM board (Trimble receiver)
23.5
Feeder attenuation indicator: take 1/2" as an example, gain -10.0 dB per 100 m, so the
indicator is 0.1 dB/m.
7.1.2 Indoor Forwarding Scheme
shows the system structure of indoor forwarding scheme.
Figure 7-2 Structure of Indoor Forwarding Scheme
From
, the indoor forwarding scheme includes outdoor receiving antenna, indoor
forwarding antenna, indoor receiving antenna, lightning protector / power divider, antenna
feeder lightning protector, and GPS signal controller.
If there are multiple BSC devices and it is not convenient to install the multiple antenna
feeder systems in an equipment room, you can use the GPS indoor forwarding scheme.
This scheme has the feature of only a set of antenna feeder system in an equipment room
and the GPS signal can cover certain scope through the indoor transmitting antenna.
The wiring of some connectors for antenna feeder lightning protector is shown in
for indoor forwarding scheme.
Figure 7-3 Wiring at Connector for Lightning Protector
The calculation formula of gain at receiver is described as follows.
Receiver gain = signal forwarder gain + gain of antenna feeder lightning pro
antenna gain + N-connector gain (or 7/16 cable connector gain) + gain of TNC/N coaxial
7-3
SJ-20110531095035-004|2011-10-28 (R2.0)
ZTE Proprietary and Confidential
Содержание ZXG10 iBSC
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