The selecting frequency network usually located in the amplifying circuit, or located in the positive feedback network.

其中的选频网络一般可以设置在放大电路中，也可以设置在正反馈网络中。

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The single frequency network (SFN) is the key technology in very high frequency (VHF) channel transmission of automatic hydrological forecast systems.

单频组网是水情自动测报系统中采用特高频信道传输的关键技术。

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This paper introduces a design of single frequency network adaptor, which consists of a core functionality module based on FPGA and a control module based on an ARM embedded CPU.

介绍了一个单频网适配器的设计方案，该方案由基于FPGA实现的核心功能模块和基于ARM嵌入式CPU实现的控制模块组成。

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There are two main methods of creating a single-frequency network.

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"Low-frequency spectrum on a network as big as ours is a real notspot-killer, " he said.

BBC: Mobile firm on rural net crusade

The cheapest way to increase capacity is to add more spectrum or to move a network to a lower frequency, which allows radio waves to penetrate walls more easily.

ECONOMIST: Saturated mobile networks