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【901】网分 技术讨论、问题报告、勘误通报
虎哥
12年8个月前
回复于
无线电
内容:仪器的输入端接混频器前,要准确就得考虑阻抗匹配,那么需要把混频器输入端断开,将
射频
前端的末尾经阻抗匹配后接仪器输入。
nanoVNA矢量网络分析仪的原理浅析
虎哥
3年7个月前
回复于
仪器仪表
内容:
射频
部分在开源网分中算是做得比较认真的。
求助:简易的大功率射频发射器的制作
小特斯拉圈圈
15年1个月前
回复于
电子技术
内容:引用第12楼WZB616于2009-12-17 19:39发表的 :大家再看看这个电路,在鬼佬的网站上找的一个
射频
发射器,宣称功率可以很大(换大功率高频管)。
出一台进口超导体设备
refinder
8年2个月前
回复于
跳蚤市场
内容:是非常理想的
射频
滤波器和信号放大器,装在基站上,可以覆盖更远的区域,减小干扰,从某种意义上可以减少基站个数,节省了成本。
想做个自动天调有些疑问
1176764177
9年11个月前
发表于
无线电
内容:也是c5的问题) 调整顺序是否可以这样c5调到最小->调整L1 C6到天线谐振 -》调节C5容抗为50ohm左右-》调整L1 C6到天线谐振-》循环逐次逼近 问题3,驻波比用那种方法检测 我想的方法是
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线套一个互感器互感器次级
求论坛里的HAM指导:新人玩SDR入手hackrf one 好吗?
cccyl
9年7个月前
回复于
无线电
内容:比如采样位数高得多、
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前端足够好、采样率高、可以全双工的!
KC908频谱仪内测样机生产进度情况通报
虎哥
4年8个月前
回复于
无线电
内容:今天
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板终于到货了,部分物料当时未到,需要手工补焊以后再测试。
问个阻抗问题
张静茹
9年2个月前
回复于
无线电
内容:还有一点我觉得挺奇怪的,
射频
线的阻抗为什么跟长度好像没关系?
ZIGBEE无线定位技术
mass_lynnxy
15年7个月前
发表于
电子技术
内容:定位引擎技术 定位引擎根据无线网络中临近
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的接收信号强度指示 (RSSI),计算所需定位的位置。,在不同的环境中,两个
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之间的 RSSI 信号会发生明显的变化。,例如,当两个
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之间有一位行人时,接收信号将会降低 30dBm。,在 RF 网络中,具有已知位置的定位引擎
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称为参考节点,而需要计算定位位置的节点称为待测节点。 ,将 ZigBee
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作为 ZigBee 协议栈上的参考节点所需的代码容量通常小于 1 Kb。
如何能够快速方便地焊接超细铜丝
Abe
8年11个月前
回复于
电子技术
内容:,拖焊,齐活 这个办法我也试验过 比较复杂 先不说转印质量 我当初用的菲林曝光 起初一切顺利 等切板子的时候 放弃了 先焊接桥丝 切割时有时会崩开 后焊接 那个要用夹具一个一个夹上焊 当时还设计过抗
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干扰的
ROHDE & SCHWARZ ESH3 测试接收机拆解
西葫芦
2年0个月前
回复于
拆机鉴赏
内容:ESH3是ESH2的继任,其
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部分设计基本相同,ESH2早在78年就上市了(没有处理器,全逻辑电路控制)。
对数周期天线KC-R100B
科创供销
4年9个月前
发表于
会员海报
无线电
内容:上述增益是采用原装
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电缆时的数据。
联发科Filogic 830(MT7986A):0~1920MHz直采
你咋不上天和太阳肩并肩
1年6个月前
回复于
无线电
内容:虽然,联发科的手机芯片的WiFi功能,近十年来,一如既往地通过IQ通道(ADC直接连接引脚)连接2.4GHz/5.8GHz的
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前端。
我与红蜘蛛势不两立之憋死这帮孙子们
迪纳米斯
6年7个月前
回复于
农业
内容:超声波照射、
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照射、微波辐照、X射线辐照、γ射线辐照。
[无奈发问]驻波电桥方向性,如何提高?
irly01
3年9个月前
发表于
电子技术
内容:实验过程:将3根
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开路线分别焊在芯片的3个端口上output端口输入是德信号源扫频信号,coupled端口接是德频谱仪input通过接开路校准件,50欧姆负载校准件来测量电桥方向性图2,图3两块电路板的测试结果基本相同图,(用
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开路线焊接测量)3.为何在系统PCB上设计的电路驻波电桥加盖上大屏蔽盒后方向性变得更差了些?
使用ADI的RF DAC制作高端无线军用干扰机
雪馒头
3年8个月前
回复于
无线电
内容:不过混频器验证板不复杂,可以进一步修改来降低价格
射频
功率放大器也是采用ADI的芯片,2W的功率,更高功率的芯片,官方没有验证板,也没有文件,即使有,也需要配套的电源电路。
讨论下RF宽带双工/反向保护的问题
虎哥
13年0个月前
发表于
电子技术
内容:现在要求:从端口上送入50W
射频
(平均功率,任意频率),或者50V直流电压时,可以耐受1分钟,仪器不损坏(前端衰减器默认为10dB)。
4MHZ 高频微型SSTC 【Class.E SSTC v0.09】
cjboy2008
14年8个月前
回复于
高电压技术
内容:驱动电路可以输出10W的
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功率,要比老外的大一倍。
洛克希德马丁公司无线电探空仪
虎哥
3年3个月前
回复于
拆机鉴赏
内容:给这东西通上电,他就应该开始发射,频率可能是403MHz或1675MHz。
[无奈发问]驻波电桥方向性,如何提高?
irly01
3年9个月前
回复于
电子技术
内容:抱歉工作有点忙,测试时附近的微带线我都割断了,再焊接
射频
开路线测试的。,甚至我把画的微带线全割了,3根
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开路线都直接焊在器件的焊盘上,指标曲线也是一样的差(曲线重合),波浪式恶化。
新坑:基于AD9361的手持监测侦察接收机
虎哥
7年3个月前
回复于
无线电
内容:
射频
芯片有需要负电源的。,某些
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功能,用正电源的选型,性能就比负电源的差。
KC-R100型便携式对数周期天线(已停产)
kcma
5年5个月前
发表于
仪器仪表
无线电
内容:上述增益是采用原装的1.5m
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电缆时的增益。
军用反坦克导弹为什么一根火箭喷出多道火焰
梁少博
9年4个月前
回复于
喷气推进
内容:引用 liushang100:引自薯条的话: 光纤直径微米级别,很小一卷就能有几十公里,用无线电的话,几百发齐射,频段就不够用,光纤就没这问题,可以几百发导弹一起图传 看到啥可以转头过去打啥,比如说本来打算打坦克
把之前的声卡SDR完善了一下,可以使用SDR#等软件控制
永恒之桔
4年1个月前
发表于
无线电
动手实践: 实验报导
内容:如果再在ADC前面加入一个
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开关,连接R820T等芯片,可以拓宽频率接收范围。,/XXXXXXXXXX/Dfinitski/SDR-Micron/ 下面是我制作出来的SDR接收时录制的视频 下图为采集和控制的板子,声卡引出了两路ADC和两路DAC,通过IPEX和下面的
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板连接
适用于火箭爱好者的遥控点火控制器KC107
虎哥
5年6个月前
发表于
无线电
喷气推进
内容:发射功率
射频
发射功率可设定为:微、小、中、高。,发
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率用于设定发
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率以避开干扰。,注:接收机设置菜单下的“新建”、“重新校码”操作,发
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率为固定的433.0MHz,不可设定。 ,收发频率该频率是指接收机的接收频率,他等于发射机的发
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率。,详情参考“本机设置”->“发
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率”设置。
我军老一代战术电台的研制与改进
TUNGUSKA
16年6个月前
回复于
电子技术
内容:中国的晶体管事业算是彻底完蛋了,别说
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,就是低频大功率管国产也没见一个能摆上台面的,搞来搞去尽是在做假货,去买几个功放的音频管,居然跑遍市场没有真货.最近搜了一些大功率MOS和IGBT的资料,鬼佬的高压
E类(class E)功放的原理及设计
papermillbridge
8年7个月前
回复于
电子技术
内容:为了使功率因数为1,就需要一个电抗抵消掉楼主这块我还是不懂,前面的傅里叶分解把U分成正弦的US和余弦的UC两部分,我们想要的到余弦的
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电流所以需要用电感Lx来抵消正弦的US,可是US和UC都会经过LX
【KS-5C】第一部分 扫频信号源 介绍以及实现
GiroPetrenko
4年8个月前
发表于
极客DIY
电子技术
内容:现阶段则使用的为LMX2572这款“带有相位同步及JESD204B支持的 6.4G 低功耗 宽带
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合成器 ”不仅如此,这款芯片还包含内置的扫频以及FSK。,另外一种解决方案为使用ADF4158(PLL)+ HMC431(VCO),但是由于更高的价格以及自制
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功分器带来不可控的插损,该方案被抛弃。
工信部51号令:《业余无线电台操作证书》不再作为设置业余电台的证明材料
虎哥
5年11个月前
回复于
无线电
内容:第十三条 各级《操作证书》允许使用的发射功率及测量方法为: (一)功率限额(指发射设备的
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输出峰值包络功率即PEP): 《操作证书》等级 30MHz以下 30MHz以上,三级 10瓦 3瓦 四级 — — (二)
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输出的峰值包络功率,,是指发射机输出端与负载正确匹配并处于最大激励时,在调制包络最大值处,一个
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周期内的平均功率。,3.在缺乏必要的
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仪表时,可以用
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未级直流供电的电压乘以最大供电电流再乘以0.8来估算。,第十四条 四级《操作证书》允许在所有业余频段内收听,一至三级《操作证书》允许使用的发
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率及操作方式按附件三的规定执行。
DIY一台玩具级的微波雷达
ddomax
7年8个月前
回复于
无线电
内容:引用 refinder:不对啊,接收端第一次变频的本振不是发
射频
率,所以feedthrough变不到低频嗯,图中情况是变不到低频,经过downconvert才到基带。
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