Specifications

18 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. E
Invisible place holder
Figure 13. Master Station Rear Panel
TX, Antenna and RX Coaxial Connectors (Type-N)
These are for connection to the station antenna, or external equipment
such as a duplexer or cavity filter. The connectors present will depend
on whether or not the radio was shipped for operation with these
external devices.
Application # 1—
No External Devices
The most common arrangement of the master station is to connect
directly to the antenna system. In such cases, only the
ANT connector
will be present and the other coaxial connector holes will be plugged.
Figure 14 shows a direct antenna connection.
Invisible place holder
Figure 14. Antenna Connection with Internal Duplexer
(Most common arrangement)
Application #2—
External Duplexer
This arrangement is used in systems where the duplexer is to be
mounted externally to the radio. The radio’s
TX and RX ports are the only
connectors present, and they connect to the duplexer as shown in
Figure 15. Contact the factory for duplexer ordering information.
OPTIONAL POWER SUPPLY
(Redundant Models)
ADDITIONAL HEATSINK
(Redundant Models)
HEATSINK
RADIO A
RADIO B
J10 ALARM
J2
4-WIRE AUDIO
J9
RJ-11
ORDERWIRE
J1
DIAGNOSTICS
(DB-9)
Power Supply
POWER
ON/OFF
POWER
INPUT
TX*
J3
DATA
(DB-25)
RX*
ANT
Ground Lug
(Hidden)
* Present when external duplexer or
cavity filter is supplied. Otherwise, holes
are plugged. See text.
Present when internal duplexer is supplied.
Otherwise, hole is plugged. See text.
†
†
ANT
Master Station