GE MDS 4790 Series Installation & Operation Manual page 27

Application #2—
External Duplexer
Application #3—
External Cavity Filter
MDS 05-3438A01, Rev. F
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Figure 14. Antenna Connection with Internal Duplexer
(Most common arrangement)
This arrangement is used in systems where the duplexer is mounted
externally to the radio. The radio's
tors present, and they connect to the duplexer as shown in
Contact the factory for duplexer ordering information.
Figure 15. Antenna Connection with External Duplexer
In some areas, interference from strong signals such as paging transmit-
ters might require using a cavity filter. A cavity filter is an exter-
nally-mounted device tuned to the frequency of an interfering signal. It
removes or greatly attenuates the unwanted signal before it is detected
by the master station receiver. Contact the factory for filter ordering
information.
Because the cavity filter must be installed inline between the master sta-
tion receiver and the station antenna, the cabling arrangement in
Figure 16 on Page 20 is required.
MDS 4790/9790 Series I/O Guide
Invisible place holder
ANT
Master Station
and ports are the only connec-
TX RX
Invisible place holder
Ext. Duplexer
ANT
RX TX
RX TX
Master Station
Figure 15.
19