Err http://us.archive.ubuntu.com/ubuntu/ lucid/main fakeroot 1.14.4-1ubuntu1 Could not connect
2018-06-23 06:26
怎样对MY-RK3288-EK314 ANDROID5.1进行编译呢？有哪些编译步骤呢？
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Ubuntu10.04怎么安装？
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嗨，我正在尝试使用网络分析仪和功率计来表征高功率设备的输出功率（峰值o / p功率46dBm）。我正在脉冲模式下进行测量。输出功率和插入增益在-13dBm下测量。 1.我已经完成了源功率校准和增强的响应校准，用于测量S21和S11测量。我获得了大约68dB的增益。输入回波损耗为-4dB（非常差）。 2.为了在DUT上进行输出功率测量，我在网络分析仪上以我需要测量输出功率的频率执行源功率校准。 3.我发现功率计上显示的功率与S21输入功率计算的o / p功率之间的差值超过了dB。我在路径中使用的总衰减为40dB。功率计在设备输出端看到匹配良好。由于回波损耗差，计算和测量的功率差异。 DUT也处于压缩状态。你能澄清一下吗？ Rgds nsm 以上来自于谷歌翻译 以下为原文Hi, I am trying to characterize the output power of a high power device(peak o/p power 46dBm) using a network analyzer and also a power meter. I am doing the measurements in the pulsed mode. The output power and the insertion gain is measured at -13dBm. 1. I have done a source power cal and an enhanced response cal for measuring the S21 and the S11 measurements. I get a gain of approx 68dB. The input return loss is at -4dB(very poor). 2.For doing the output power measurements on the DUT , I do a source power cal on the network analyzer at the frequencies I need to measure the output power. 3. I find that there is a difference of more than a dB between the power indicated on the power meter and the o/p power computed from S21-input power. 4. I am using a total attenuation of 40dB in the path. The power meter sees a good match at the output of the device. Is the difference in the power calculated and measured because of the poor return loss. The DUT is also in compression. Could you please clarify. Rgds nsm
2019-07-23 11:17
