2018.2.27 RF module distance test part I

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2018.2.27 RF module distance test part I

Last week,we finish 20 pcs EP2 sample for RF module, Fistly,we need to test PCBA performance test .include tranamitted power, frequency deviation,and harmonic wave,that took a long time,but not to worry,we can finish it. Secondly ,we must complete…

2018.3.1 RF module distance test part II-

1 Test circuit diagram 2 Test demo 3 Test record 4 Test analysis 5 Test results and discussion EP sample layout need change (R2 or C4)…

phoenix客户端连接hbase数据库报错：Traceback (most recent call last): File "bin/sqlline.py", line 27, in <module> import argparse ImportError: No module named argparse

环境描述: 操作系统版本:CentOS release 6.5 (Final) phoenix版本:phoenix-4.10.0 hbase版本:hbase-1.2.6 现象描述: 通过phoenix客户端连接hbase数据库时,无法正常连接,报下面的信息: [aiprd@host-10-191-5-227 phoenix-4.10.0]$ bin/sqlline.py 10.191.5.227 Traceback (most recent call last): File "bin/sqlli…

【VSCode】Windows下VSCode编译调试c/c++【更新 2018.03.27】

--------– 2018.03.27 更新--------- 便携版已更新,点此获取便携版已知BUG:中文目录无法正常调试用于cpptools 0.15.0插件的配置文件更新新的launch.json // Available variables which can be used inside of strings. // ${workspaceRoot}: the root folder of the team // ${file}: the current opened file…

2018/03/27 每日一个Linux命令之 cron

Cron 用于配置定时任务. -- 环境为 Ubuntu16-04 -- 先说说怎么配置一个简单的定时任务.直观的可以看到效果. 之前在网上查找资料,对Shell编程不熟悉的实在是很头疼,走了不少弯路,但是这个又是是比较重要的命令. 先明白Cron的结构,Cron是一个[守护程序]用于在指定的时间内执行行程类的任务,每一个用户都有一个Crontab文件,执行计划.相同的,系统也有一个 Crontab. -- 创建一个定时任务 crontab -e 当你输入指令时,会出现下面的界面,我们直接向下看…

2018.11.15 RF antenna impedance-matching

We have studied the impedance-matching of RF transmission line between the antenna and the RX / TX module today. 1. RX Sensitivity testing After the antenna and matched circuit are installed, there is 10 dB difference between the good machine and th…

安装Phoenix时./sqlline.py执行报错File "./sqlline.py", line 27, in <module> import argparse ImportError: No module named argparse解决办法（图文详解）

不多说,直接上干货! 前期博客 Apache版Phoenix的安装(图文详解) 问题现象 Traceback (most recent call last): File , in <module> import argparse ImportError: No module named argparse 解决办法 [root@master phoenix]# yum install python-argparse Loaded plugins: fastestmirror, refresh-p…