User's Manual

Operation
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 32 of 134
3. 2-level FLEX™ is enabled by pulling the H-bit to Gnd otherwise 4-level FLEX™ is enable.
FLEX™ OPERATION FOR LEGACY SYSTEMS
For legacy systems which have firmware older than 4.0, the MSB and the LSB need to be swapped and the
configuration is as follows:
1. The LIU connector is wired with the H-bit as the MSB and the L-bit as the LSB.
2. The FLEX-4 protocol is selected by Profiles -> Paging Protocol -> FLEX-4 with Data Invert ->
Normal.
3. 2-level FLEX™ is enabled by pulling the L-bit to Gnd otherwise 4-level FLEX™ is enable.
4.4.6 Custom Deviation
The transmitter supports generation of non-standard paging protocol settings by selecting custom in the
Profiles -> Paging Protocol option (see 0). A custom deviation and either 2 or 4 level FSK can be set and used
for that protocol. The custom deviation setting is useful for legacy paging systems with non-standard protocols
and/or paging receivers.
4.4.7 Carrier Offset
The carrier offset setting is provided for use in simulcast paging networks. The offset from the carrier
frequency can be specified for each protocol. The carrier offset can be set from +4000 to -4000 Hz in
increments of 1 Hz.
4.5 Fan Control
The transmitter has two fans for cooling; the front fan is an intake and the rear fan is the exhaust. The fans
turn on at the configured fan turn on temperature, and then turn off at the configured fan turn off temperature.
The temperature reference is configurable to either individual sensors, the hottest of all sensors, or the hottest
of all sensors on the PA and Isolator (‘PA Group Sensors’).
4.5.1 Fan Override
There is a fan override feature available to force the fans to turn on at full speed. When fan override is set to
always on the fans will turn on and ignore the reference temperature.
4.5.2 Self-Test
The fan controller has a self-test feature which causes the fans to run at full speed for a minute so fan operation
can be verified. The self-test feature runs once every 24 hours by default.
Paging Protocols -> Advanced
Paging Protocols -> Profile [1|2] -> Carrier Offset
Fan Control