中国无线电频率分配表免费下载。
2022-07-18 17:01
推荐的业余无线电频率使用规划频 段 通信方式 频率（单位：MHz） 1.8MHz
2010-09-15 16:43
为了充分、合理、有效地利用无线电频谱，保证各种无线电业务的正常运行，防止各种无线电业务、无线电台站和系统之间的相互干扰制定了无线电频率划分规定。本规定中列入的中国
2011-07-09 14:46
无线电频率资源是宝贵的战略资源。对影响无线电频率资源价值的因素，如频段的传播特性、带宽、产业链成熟度、干扰共存等进行了详细分析，提出了一种比较评估任意频段、任意带宽
2021-03-19 09:21
中华人民共和国无线电频率划分规定:《中华人民共和国无线电频率划分规定》已经2006 年9 月5 日中华人民共和国信息产业部第二十三次部务会议审议通过，现予公布，自公布之
2010-02-11 14:42
2012-11-14 16:48
Abstract: With industrial/scientific/medical (ISM) band radio frequency (RF) products, often times users are new to the structure of Maxims low pin-count transmitters andfully integrated superheterodyne receivers. This tutorial provides sim
2012-10-08 17:45
There are only two basic steps used to optimize the operation of a simple ISM transmitter （shown in Figure 1）： make sure that the reference frequency is properly tuned， and correctly match the output network of the transmitter to the antenna. A crystal oscillator is commonly used as the reference in both the transmitter and receiver circuits， so that optimization technique is addressed in the Receiver Optimization section below. After establishing a starting point， adjustments are guided by measuring the transmitted power and the PA current as a function of frequency. The measureme
2017-04-05 09:57
无线电管理的术语与定义 .......11.1 一般术语 &nbs
2008-08-22 22:31
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2023-07-19 17:11
