User's Manual

TEX502LCD
ELETTRONICA
33 / 36
User Manual
Rev. 2.0 - 26/06/19
7.6 Control Board
The main function of this board is to check and correct the MOSFET polarization
voltage of the RF amplifier section.
It also provides the measurement of the absorbed current and contains a circuit
for signaling power supply unit faults.
If no alarms are present, the voltage is adjusted only depending on the set output
power, with a feedback mechanism based on the reading of the power really
delivered (AGC).
The voltage is also affected by other factors, such as:
• Control of the power level in output, depending on the setting
• External AGC signals (Ext. AGC FWD, Ext. AGC RFL).
• Excess of temperature.
• Excess of absorbed current from the RF module.
7.7 Low pass filter card
This card provide the low-pass filtering of the RF signal in output and measure theow-pass filtering of the RF signal in output and measure the
reflected and forward power output.
7.8 Bias card
This card controls the bias voltage and contains AGC networks for forward power,
reflected power, temperature, current and EXT AGC.