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约找到 1041 条结果,耗时 0.264 秒
穷鬼买频谱分析仪,求指点
虎哥
13年4个月前
回复于
电子技术
内容:新的MDO4000混合域示波器系列有助于工程师捕获时间相关的模拟、数字和
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信号,获得完整的系统级观测,帮助他们快速解决复杂的设计问题。,通常情况下,一位工程师要么是混合信号/数字信号工程师,要么是
射频
(RF)信号工程师。
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立棍
13年10个月前
回复于
电子技术
内容:结论是最好有专用
射频
仪器,否则制作难度极端大。
请教这个板子为什么失真这么大?
ZhangYannan
7年8个月前
回复于
电子技术
内容:自己不是学这个专业的,
射频
相关知识也没系统地学过,不过对这个方向很感兴趣,自己学着玩,问题很鸡肋,惭愧惭愧。
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LShang001
9年4个月前
回复于
喷气推进
内容: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,图传看见那边有个指挥部
KC901S测量板载天线时如何对延长线进行校准?
zepan
9年5个月前
发表于
仪器仪表
内容:我刚接触
射频
,有些地方可能理解有误,所以希望坛上的大神指点确认下: 蓝牙芯片是差分信号出来(芯片引脚输出阻抗70+j30),经过一个巴伦,再经过一个滤波器(匹配电路?)
回 53楼(bolide) 的帖子
古人
11年8个月前
回复于
科创基金
内容:但是出于严格遵守我国对于无线电相关规定的态度,这个模块的发
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率和功率均超出了免执照无线电频谱范围之外。,——箭体材料的选用,请咨询ASR项目组总负责人还哲同志;GPS天线将安装在整箭无大幅信号衰减性材料的地方,同时使用全向馈电阵子与带通滤波器和低噪声
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放大器,提高信号接收可靠性。,对于如何解决这个问题,T.A.A.T.现有两套支持
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直采的ADC EVM,以及一片NovaTek GNSS Receiver,我购买这三套EVM的目的就是通过使用软件无线电的方式解决上述问题,把解算环节交给电脑
手持式无线电侦察仪KC908用户手册
kcma
4年9个月前
回复于
无线电
内容:
射频
插座已经严密加固,但插座的结构决定了不能承受较大的力。,长的接头会显著增大力臂,容易撬坏
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插座。 ,弯头如果凸出仪器外廓,仪器意外倾倒时,会撬坏
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插座。 ,在城市中,宽带室外天线收到的总
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功率比较大,往往可达0dBm以上。,(4)天线柄的根部应当坚固,柔软的天线柄很容易导致芯针晃动,撬坏
射频
端口。
日狗MSO5072示波器小测,结果还说的过去。
bg1ug
1年9个月前
发表于
仪器仪表
内容:测试环境:罗德施瓦茨SM03HD信号源,GOER 18G
射频
线,RIGOL 5072示波器。
(水水水)高压线性稳压器(设想)
ehco
4年9个月前
回复于
极客DIY
内容:开关电源并不简单,做一台合格的开关电源,拓扑计算,磁元件设计和环路设计就够你喝一壶,难度丝毫不亚于
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电路设计;UC3842是电流型PWM芯片,一般用来驱动正、反激拓扑,基本都是硬开关应用,效率不经过特殊设计的话不可能高于
先进的小学生发明,求解
3ha510
12年7个月前
发表于
极客DIY
内容:(原文还有一张图的,上面ms用的是
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通信模块。。。)
讨论如何去DIY一套无线电测向系统(315M进行中)无线电爱好者请现身指导
jrcsh
13年7个月前
回复于
无线电
内容:大概您是打算把天线放在相距仅几十厘米的地方,这样已经小于一个波长了,前端
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模块,特别是“315模块”不可能在一个周期内鉴别出先后,甚至几个周期也不行。
罗德施瓦茨RS-FSEA频谱仪的维修两例
虎哥
11年2个月前
发表于
仪器仪表
内容:拆开机器,设为0SPAN,测YIG
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环路的检测端,几乎无信号,说明内部有故障。,取下本地震荡器板,接上检修电缆和
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电缆,悬挂在机器上。,用901接探针测鉴相器的两路
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输入,晶体来的720MHz可测到约0dBm的信号,VCO来的信号,能测到-10dBm的信号。,和其它机器比较,
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电路板上的接插件不匹配。
采购电容
TUNGUSKA
16年11个月前
回复于
电子技术
内容:2-26 22:43:13的发言:不计成本这个限制条件太恐怖了,没有人敢和你竞争……当年陈老总放话“脱裤子当当,也要把原子弹搞出来”这种电容的特性我很清楚,允许非常大的脉冲充/放电电流和相当高有效值的
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电流
手机信号屏避那玩意是啥原理 能DIY不?
六味地黄丸
13年11个月前
回复于
电子技术
内容:是同频干扰原理,宽带(只要覆盖移动电话的某一频点的地址码,而具体到你的移动电话,顾不知道随机状态)干扰场强只要大于等于(小于也行,只要干扰的一组数,大于纠错码数)接收点,即可以了.说了半天,就是你发射的(干扰源)
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带宽大于
4MHZ HF SSTC V0.01版
金坷仙
12年11个月前
发表于
高电压技术
内容:由于我现在还在上高三,没有太多的时间弄TC所以对于电路的驱动部分做得很简洁,其实对于
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电路,强劲的驱动是必须的,等高考后我还会对驱动电路做改进!
KC1050信标发射机相关资料
kcma
5年1个月前
发表于
会员海报
内容:一.概述KC1050是一款无线电信标发射机,可以在VHF频段(2m)和UHF频段(0.7m)发射小功率
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信号,作为测向训练的搜索目标或电码练习器使用。,KC1050的包装包含:KC1050 信标发射机 1台
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天线 1条用户手册 1册升级线可单独订购,此时 以订单配置为准。
自制的业余电台出现问题
UECMITSUI
3年2个月前
发表于
无线电
内容:前天晚上没有接入强放级,直接由6P14的振荡级辐射出经音频调制后的
射频
信号,效果得比较完美,收音机接收信号很强且没有太多交流声。
美将建世界首座太空太阳能电厂要电力(组图)【转载】
wink101495
15年9个月前
发表于
极客DIY
内容:根据计划,Solaren将利用绕地球轨道运行的太阳能电池板发电,而后将电量转换成
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电波加以传送,位于弗雷斯诺的接收站则负责接收
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电波。,在这里,
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电波将被转换成电量并输入电网。
KC901H标量网络分析仪开源图纸资料
kcma
5年5个月前
发表于
仪器仪表
内容:下载链接:
射频
组件控制组件结构展示图内蒙古呼和浩特网友王志安先生2012年初设计的开机图片因为硬件改动等原因,KC901H的固件存在很多版本。
一种数字图传的设想
你咋不上天和太阳肩并肩
2年2个月前
回复于
极客DIY
电子技术
内容:①恒玄 BES2500YP(蓝牙5.2双模 支持LC3编码器的LE Audio)最关键的是拥有一个用于同步左右耳机音频(主耳机转发到副耳机)的10~15MHz的
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收发器,速率高达3Mbps,涵盖短波通联著名的
手持式无线电侦察仪KC908用户手册
kcma
4年9个月前
回复于
无线电
内容:
射频
端口在仪器的顶部,左侧主要是数据端口和调节旋钮。,
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端口采用K型阳性连接器,俗称2.92连接器,兼容SMA标准。,2端口(右)可以输出较弱的
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信号。 ,拨动电路板确认完全松动后,(7)用带钩的工具从远离
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端口的一端将电路板提起至略高于外壳边缘,(8)沿与
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端口相反的方向将
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端口退出外壳,移除电路板,即可看到电池。,复装前,先检查电路板上的
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端口是否有错位,即
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连接器外壳与电路板侧面应当紧密贴合,不可留有缝隙。
拆解一个古代微波源
coulson21
4年3个月前
发表于
拆机鉴赏
内容:一个标准的
射频
信号发生器对于这个应用有点大材小用了。
连载:DIY适用于高可靠应用的遥控器和接收器
虎哥
7年4个月前
回复于
电子技术
无线电
内容:LoRa芯片资料:关于
射频
怎么做,这种低频小功率对科创实验室而言没什么难度,以后细讲。
连载:DIY适用于高可靠应用的遥控器和接收器
虎哥
6年3个月前
回复于
电子技术
无线电
内容:2、原本由甲遥控器负责遥控的从机,不能被乙遥控器触发(概率0);3、从明确安全责任考虑,不允许多个遥控器同时控制一个从机,即使用户故意试图这样设置也不行;4、攻击者录制任何时候的遥控信号(例如直接录制
射频
从航空那边转的,大家看看可不可靠
warmonkey
11年4个月前
回复于
无线电
内容:如果考虑了地球曲率,频率就不能用得太高这时候出现2个问题1是否允许在该频率使用如此大带宽的
射频
设备2能否在低频率制作出宽带90度功率分配器,并且保证有足够低的相位误差2是比较难满足的条件,0.1db幅度误差
偶们3GHz标网的用户手册正在编写,再此连载,欢迎纠错
虎哥
12年11个月前
回复于
无线电
内容:续集第三章、测试前的准备
射频
电路与低频电路的测试有显著不同。,来到
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世界,我们就必须准备专门的器材,使用专门的方法,才能得到正确的结果。,在这种情况下,只需要增加一根
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电缆即可组成测试系统。,如果待测器件较大或者接插件的型号恰好不匹配,就需要用到两根
射频
电缆。
Tektronix 496P频谱分析仪维修
西葫芦
2年2个月前
发表于
仪器仪表
内容:为检查本振和大部分
射频
通路,将频谱仪调谐到0Hz,也就是所谓的“零频”。,在此处频谱仪可以看到自身的本振泄露,这说明496P的大部分
射频
通路和控制系统都正常工作,可以进一步进行工作状态检查。,1.拆除输入衰减器,直接从第一混频器输入端口处提供100MHz
射频
信号,根据频谱仪CRT显示的RF ATT值设定信号源幅度,REF LVL为0db时,RF ATT为30db,因此输入-30dbm的信号,,实际上读出的幅度在-40dbm以下,这代表
射频
通路中某处损耗大或增益低。
场管最大开关频率计算
量子隧道
14年8个月前
回复于
电子技术
内容:只要有合适的
射频
匹配和阻抗变换,能在计算匹配时把这些电容巧妙地计算在内,并尽量降低电路阻抗以与大电容匹配,也能获得很大的功率增益。
关于空间通信的场强预测和功率初定
虎哥
13年0个月前
发表于
电子技术
内容:可以得到场强预测公式:E(dBuV/m)=74.77+eirp(dBW)-20lgd(km)以下均针对50欧
射频
系统而言。,即根据噪声场强的大小,换算出噪声在端口上的电压,并要求信号大于噪声某一个值,为了安全,还可以人为设定一个
射频
保护比。,已知一台接收机的灵敏度是-110dBm,带宽1MHz,接收天线是0dBi的全向天线,有L=3dB的馈线损耗,工作频率1260MHz;火箭上的发射天馈系统的最小增益是-6dBi(即不论火箭如何滚转,都不会小于这个增益),
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保护比
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