User's Manual

14 TRM SB Integration Guide MDS 05-4121A01, Rev. 02
Table 2 summarizes minimal recommended access requirements for
field setup and servicing of the TRM SB radio transceiver. Other
interface signal functions may be of use to field service personnel or as
part of a diagnostic design for the whole user-defined package.
2.3 Antennas and Feedlines
Antennas
The transceiver can be used with a number of antennas. The exact style
depends on the physical size and layout of the radio system. Suitable
antennas are available from several manufacturers, including GE MDS.
At master stations, omni-directional antennas (Figure 6) are typically
used to provide equal coverage to all remote sites in the network.
Invisible place holder
Figure 6. Typical Omni-directional Antenna for Master Stations
(Shown mounted to mast)
Table 2. Configuration and Evaluation Signals
Function
Data
Interface
Pin Signal Type
)
Description
Enable Configuration 11 Low = Enabled Enables terminal
interaction with module.
Disables payload
throughput.
Received (RF) Signal
Strength Signal
Indicator—RSSI
12 Analog
0–3 Vdc
Aid to aiming antenna
system and determining
presence of radio signals
Synthesizer Lock 2 H = Locked
L = Out-of-Lock
Unprocessed indicator of
state of transceiver’s
frequency synthesizer.
Signal may contain
inconsequential transients