Manualshelf

User's Manual

ManualsBrandsTechnalogix ManualsElectronics8VSB TELEVISION TRANSMITTER
21222324252627282930
Technalogix Ltd TAVD-500 Transmitter
VI-1
Section VI – Monitor and Control System
Control System Overview (Insight)
The Insight control system is used for a variety of functions, the most important of which is
ensuring that the transmitter continues to operate in a safe manner. The control system also
allows the user to monitor and control the transmitter from both the front panel and the remote
access port.
Five modules comprise the Insight control system. These modules work together to provide all
the functions of the control system. The modules are: User Interface, Coupler Conditioning, RF
Conditioning, Temperature Sensor, and the TxNET modules. The operation of each module is
outlined in the following sections.
For the TAUD-20-3 only, all three Power Amplifier chains are controlled by one User Interface
Board and all three Power amplifiers are monitored on one LCD screen. In case of an alarm,
the unit number and the fault will be displayed on the front panel (i.e. PA2 High Reflected
Power). During the alarm situation only the error screen will be displayed while the other two
units continue to run normally. The alarm buzzer will sound different on PA1, PA2 and PA3.
User Interface Module
The primary function of the User Interface module is, as the name suggests, providing the user
interface for the control system. This circuit board is mounted to the front panel of the
transmitter, directly behind the LCD display. The membrane switch on the front panel is also
connected to the User Interface module. These components together provide the user with the
ability to monitor the transmitter from the front panel.
The following parameters can be monitored from the front panel:
• Forward (incident) power at the transmitter output.
• Reflected (reverse) power at the transmitter output.
• DC voltage of the transmitter power supply.
• DC current for each pallet in the transmitter.
• Digital attenuation for input signal.
• Temperature of the heat sink of the transmitter.
• The time since the transmitter was last shut down.