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7
circuit only work for the modulation cell, user can set parameter via this part.
Amplifier circuit contains preamp, power amplifier, and power monitor. The RF signal from
modulation goes to rated power after this amplifier circuit. This part also has separate
control-display circuit for listing the information as power, voltage, current, temperature, and
showing working status.
4. Test Instrument
Name
Type
Specification
Manufacturer
Television Generator
TSG-271
Tektronix
TV Monitoring Receiver
PM5696
Philip
Video Measurement Set
VM700A
Tektronix
Audio Analyzer
P1DD
Audio Precision
Video Modulate
Audio Modulate
Preamp
Power
Amplifier
Power Supply
MCU
LCD
Display
COM
Interface
Figure 3-1 ZHC518A-50~300W TV transmitter
Structure and function
Power Monitor
TV
RF Output
Key
Buttons
AC 220V
Input
Video Input
Audio Input
Power Supply
LCD Display
Key Buttons
