GUANG ZHOU HAN TING INFORMATION TECHNOLOGY CO.LTD WWW.FMUSER.NET
USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER
7
Physical Specification
Casing Size 3U
（
484mm
×
88mm
×
600mm
）
、
19Inch
Weight 25
±
0.2kg
Ambient temperature 5
℃～
+40
℃
Relative Humidity
＜
95%
Sea Level Height
＜
4500m
3. System Structure and Function
CZH618F-1000C digital FM broadcast transmitter is composed of five parts: Power Supply,
Main Control and Display Cell, Audio Processing and Frequency Synthesizing Cell, Power
Control Center, and Power Amplifier Cell (it is showed by Figure 3-1 ).
The Power Supply changes the 220V AC to all kinds of DC for other parts of transmitter.
Main Control and Display Cell is an interface between users and the machine. It puts all
information about transmitter on the LCD, and users can configure the transmitter via pressing the
key buttons.
Audio Processing and Frequency Synthesizing Cell is the core of the transmitter, This part
does pilot stereo code, pre-emphasis, and audio gain for inputting audio signal which can be analog
or AES or SCA by using digital signal process technology, and meanwhile, it using direct digital
synthesis technology to get frequency which users want.
Power Amplifier Cell contains Driver, Power Distribute, Amplifier, Power Combiner, Filter,
Power Monitor.
Power Control Center Controls output RF power at a value form Main Control and Display
Cell, according as sampling value of power, voltage, current, temperature. At the same time, it
sends sampling value to Main Control and Display Cell to display.
