User's Manual Part 3

Affinity® Control Systems - 140 -
®
Affinity LBD-200C-N1 Transmitter
Product Manual
20 Affinity Transmitter Control Systems
The upconverter amplifier (UCA) control system (driven by multiple microprocessors) monitors
and controls all of the transmitter sub-assemblies, and provides transmitter status information to
the operator.
A user-friendly man/machine interface is provided by:
x A front-panel control interface for menu driven commands (select, enter, escape, &
exit buttons).
x A front panel LCD screen located on the driver module providing transmitter status
information (status of transmitter, output power, power supply, local oscillator, and
upconverter).
The transmitter safety system is hard wired, which allows for real-time processing, and is
independent of the control system.
20.1 Automatic Control Systems and Monitoring
Automatic control systems protect the transmitter against VSWR problems and excessive air
input temperatures by affecting successive restarts---first at the nominal power---then at –3dB
while maintaining the transmission quality at the level obtained at nominal power output.
Approximately, a 30-second delay will occur between the restarts. The transmitter is
automatically shut down if the fault persists.
The transmitter is also protected by a safety system that causes amplifier module shutdown
(due to excessive transmitter temperature, etc.). Monitoring of operational parameters, alarms,
power output, VSWR, status of amplifiers, drivers and safety loops are available.
20.2 Status Monitoring and Control System (SMCS)
The Omnitronix SL81 Status Monitoring and Control System (SMCS) is provided for use with
the Affinity® LBD-200C-N1 transmitters. The SMCS is a rack-mounted unit located within the
transmitter cabinet. It provides a web interface and an SNMP agent for remote control. Remote
access to the SNMP agent is available through a GSM connection or via dial-up modem and a
PSTN line. All events and faults are stored in a logbook with date and timestamps.
20.2.1 SMCS Functions:
Controls
The SMCS has the ability to access the On (transmit), Off (standby), and Reset commands.
Other operational commands, monitoring and safety controls, and diagnostic help system are
available. The SNMP manager program can be used to browse the MIB of a connected device
and select variable(s) to be modified.