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6
8. the distance between video and audio carrier 5.50MHz
±
500Hz
2.1.3 RF Index
1. RF frequency range
2. Frequency accuracy 5KHz
3. Total frequency deviation 20KHz
4 A/V ratio -8~-22dB(0.5dB step)
5 C/N
≥
62dB
6. spurious output suppression
≤-
60dB
7. RF output impedance 50
Ω
2.1.4 Others
Power Voltage AC200V~ AC250V 47Hz~63Hz
Heat dissipation Forced ventilation
2.2 Physical Specifications:
RF output connector L16/L27
Casing Size 4U
（
484mm
×
172mm
×
600mm
）
、
19Inch
Weight
Ambient temperature 5
℃～
+40
℃
Relative Humidity
＜
95%
Sea Level Height
＜
4500m
3. System Structure and Function
This TV transmitter is comprised of two general parts, modulation cell and power amplifier
cell. Modulation cell contains power supply, modulation circuit, and control-display circuit; as the
same, power amplifier cell includes power supply, power amplifier circuit, and control-display
circuit (shown as figure 3-1).
Modulation cell put audio and video signal on the carrier RF signal. This control-display
