The remote control device crystal frequency stabilization using pulse amplitude modulation transmitter, A simpler circuit, high frequency stability, launched 28MHZ are continuous carrier amplitude.

该遥控装置采用晶体稳频脉冲调幅发射机，电路较简单，频率稳定度高，发射的是间断的28MHZ等幅载波。

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Transmitter has a high frequency stability and big FM deviation and can also operate under the changing of power supply voltage in the range of. 30%.

其发射机频率稳定度高，调制频偏大，在电源电压变化约30%的条件下亦能稳定工作。

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For high requirement of transmitting carrier in TV transmitter, frequency synthesizer as one of the most important parts in transmitting system is researched in this paper.

就电视发射机对发射载波的高要求，论文对电视发射系统中关键部件之一的频率合成器进行了研究。

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The high-frequency sound from the transmitter produces sharp reflections of small objects for the same reason that an electron microscope (which operates at high frequencies) can see smaller things than a light microscope (which operates at low frequencies).

ECONOMIST: Archaeology