User's Manual

Installation
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 9 of 134
Use extreme caution when installing antennas and follow all instructions provided. Because external antennas
are subject lightning strikes, STI Engineering recommends protecting all antennas against lighting strike by
using lightning surge arrestors.
2.3 Product Installation
The back panel of the AC model paging transmitter is shown below in Figure 1.
Figure 1: Paging Transmitter Back Panel (AC model shown)
1. System Ground: External connection for system ground. When connecting a 24 VDC supply the
negative line is connected to the system ground. When connecting a -48 VDC supply the positive line
is connected to the system ground
2. RF Output: Modulated RF output from the paging transmitter. N-type female connector.
3. External Frequency: External reference input for accurate channel synthesis. BNC female connector.
4. Ethernet: Ethernet connection for configuration and diagnostics over UDP. RJ45 connector. The
Ethernet cable from the RFI-148/900250 to the Ethernet switch must be less than 10 metres long.
5. AC Switch: Power switch.