The snag, however, has been that while efficiency is good at close contact, it can drop to zero at even a few millimetres from the transmitter.
一个意料外的障碍是，尽管在相当近的距离内传输效率很高，可一旦和传输器的距离达到几毫米，效率就会跌到零。
Linearization and efficiency enhancement techniques of power amplifier can be adopted to improve the linearity and power efficiency of the transmitter.
于是功率放大器的线性化以及提高效率的技术被采用来改善发射器的线性度和效率。
Designing a high linearity and high power efficiency wireless transmitter is a big challenge due to the nonlinear characteristic of the power amplifier.
而功率放大器又具有非线性特性，因此要设计高效率又高线性度的无线发射机便成了一个相当困难的挑战。
For RF transmitter circuits, the efficiency is largely determined by the efficiency of the power amp (always abbreviated as "PA" in RF discussions).
对RF发送器来讲效率主要由功放(PA)的效率决定。
The MW SSB stereo broadcasting system requires high efficiency of the transmitter which usually employs high power amplifier, as the high quality of information transmission is important.
中波单边带立体声广播发射系统，除要求高质量传送信息外，由于其发射功率较大，因此，如何提高发射机效率也是至关重要的问题。
To improve the spectral efficiency for uplink data transmissions in TD-SCDMA, the authors propose a scheme to transmitter and receiver for uplink.
为了在TD - SCDMA上行链路传输中获得更高的频谱利用率，提出了一种上行链路的发送和接收方案。
This transmitter can simultaneously emit all signals in the whole bandwidth, having high operating efficiency, simple structure and strong feasibility.
这种信道化发射机能同时发射整个处理带宽内所有信道上的信号，具有很高的运算效率，且结构简单，可行性强。
Based on the National Hi-Tech Research and Development Program (863), this project studies a novel high efficiency and linearity front-end of RF transmitter.
本课题是基于国家高技术研究发展计划(863)项目，研究新型高效率高线性射频发射前端。
Based on the National Hi-Tech Research and Development Program (863), this project studies a novel high efficiency and linearity front-end of RF transmitter.
本课题是基于国家高技术研究发展计划(863)项目，研究新型高效率高线性射频发射前端。
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