User's Manual Part 3
Backplane/Interface Boards - 130 -
Affinity
®
LBD-200C-N1 Transmitter
Product Manual
System Configuration
During factory set-up and test, the various transmitter systems under the control of the MSI are
configured, and settings stored, in the MSI non-volatile memory. Some configuration settings
are used to enable and set-up optional resources of the MSI. The settings are stored in
“personality” variables. In general, users should not change variables, but the user can read
back the values of the variables to recall the available MSI resources. The variables are briefly
described below. For a more detailed description of the personality variables, refer to the SNMP
document.
x On Board Resources Personality (OBR_PERSON) – enables or disables MSI
systems such as PAS Manager for quads and MRO.
x Local Serial Bus Personality (LOCAL_PERSON) – enables or disables local serial
communications with the plug-in modules.
x Auxiliary Serial Port Personality (PORT_PERSON) – enables or disables the Aux
Port system.
16.7 True RMS Detector Module
The signals coming from the directional coupler feed the
True RMS Detector Module with both the forward power
and reflected power proportional to the transmitter output.
The input attenuator matches the directional coupler port
and level to the detector.
The RMS Detector Module is based on a true RMS
detector-chip that provides linear RF detection with high
sensitivity. The log function of the detector allows for the
measurement of the rms power independent of the peak-
to-average ratio of the specific waveform of the
transmitting signal. Temperature compensation and fault
detection are provided with the circuit.