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约找到 1041 条结果,耗时 0.332 秒
制作2.1kW电子管短波功放
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5年8个月前
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射频
发射器”明显远了,而且以前试验的效果是换台
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13年0个月前
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虎哥
7年3个月前
回复于
无线电
内容:由于9361没有找到模型,用9371来计算试试(注意,9371的
射频
特性相比9361有重大变化,通俗而言可以认为9371是直接怼混频器,没有LNA,所以噪声大得多,但截点高得多,给前级设计留下了更大的发挥空间
用于测向训练和比赛的多功能信标发射机KC1050
科创供销
4年11个月前
发表于
会员海报
无线电
内容:1、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
射频
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
射频
天线(UHF) 1条 用户手册 1册 USB充电线 ,a.自动等幅电报 发射机通过开关
射频
信号来发送摩尔斯电码,拍发的速度和电码的内容可在KC1050上编辑。,停止时,信标不输出
射频
信号。
科创(成都局)招聘专职工作人员启事
科创喵
5年0个月前
发表于
社区公务
内容:D、招聘岗位1、机械工程师主要工作内容:仪器仪表、半导体工艺设备、微波雷达等领域相关机械、结构设计,主要包括:1)非标自动化设备机械结构设计开发;2)天线、波导等微波
射频
结构件,根据微波工程师的仿真结果设计可制造的机械结构,5)结构较为简单的
射频
有源电路、功放设计。,能力要求:1)基础知识扎实,熟练掌握电磁场与电磁波、电路原理、高频电子线路的基本理论和设计方法;2)了解微波工程以及工业微波产品的一般设计模式;3)熟练使用
射频
电磁场仿真软件,能够快速建模并求取参数;4,3、硬件工程师主要工作内容:电路硬件部分原理设计、PCB设计,主要包括:1)模拟小信号放大电路2)
射频
小信号电路3)微带电路4)电源5)数字电路能力要求:1)基础知识扎实,熟练掌握电路原理、模拟电子线路的基本理论和设计方法,2)熟悉
射频
电子线路基本概念、原理和仿真计算。
关于空间通信的场强预测和功率初定
虎哥
13年0个月前
回复于
电子技术
内容:带宽太大,调制增益太低,增大的
射频
带宽和获得的扩频增益的取舍不经济,方案还需斟酌。
E类(class E)功放的原理及设计
ne555
8年7个月前
回复于
电子技术
内容:引用 papermillbridge:开关管两端电压含有正弦成分,而
射频
电流为余弦函数。
自制LORA平板定向天线
m24h
5个月7天前
发表于
极客DIY
内容:我在
射频
方面是个新手 无奈为LORA设备买到的便宜天线 都比较磕碜 看中的定向平板天线总觉得太贵 于是打算自制 当然是可能失败的 毕竟网上也找不到平板定向天线的资料 只能自己想象了目标是极化方面: 应该是线极化,调整成想要的频率点和覆盖带宽最后用巴伦进行阻抗匹配和完成平衡变换目前已买尺寸70mm左右的覆铜板 尚未到货 在kicad上模拟了一下 使用1.5mm线宽是个尺寸不错的选择 可以轻松画下2对分支 因为没有
射频
经验
HX9500.01手持式扫频分析仪全部开源
虎哥
13年0个月前
回复于
电子技术
内容:何况阻抗等也与
射频
系统相差甚远。
E类(class E)功放的原理及设计
ne555
8年7个月前
回复于
电子技术
内容:引用 papermillbridge: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
射频
电流所以需要用电感Lx来抵消正弦的
重开一贴,6000大样DIY一架2公里无线数传涡抡喷气发动机航模 实验机
hammond
14年10个月前
回复于
极客DIY
内容:图像传输方面可以考虑采用视频无线RF调制后发射,频率可以考虑用微波段,什么高清视频都没问题。
关于TC442X芯片在高频小特斯拉线圈上的应用探索
Miller
8年8个月前
回复于
高电压技术
内容:NPN型的直接到地,而PNP型的需要一个退耦电容把
射频
地短接。
KC761能谱仪日常进度(含设计变更公告)专用帖
巨大橘子
2年1个月前
回复于
核技术与核仪器
内容:就我的一点经历来说,大多是到误计数为止,然后这种误计数日常生活中影响程度可以挺大,来了也挡不住,感觉要是屏蔽能做到闪烁体的量程上部就可以了,大不了低量程以闪烁体为准…还是要各位
射频
大佬加油,我目前买了各种屏蔽材料一路遮上来跟没遮一样
火焰强劲的HFSSTC高频特斯拉线圈实验之(二)
joyeep
14年2个月前
回复于
高电压技术
内容:做个类比~~~ 6MHZ 以上的
射频
辐射,考虑转变成光和热能的能量,还剩下50%的电磁能,直接作用于机体。
场管好坏测量求助
北落师门
12年7个月前
回复于
高电压技术
内容:一般在用的MOS里IRF640的电容是比较小的,250这些管子非常大,而
射频
MOS由于需要在非常高的频率下开关,其GS电容非常小,只有几个p
Tektronix 496P频谱分析仪拆解
西葫芦
2年2个月前
回复于
拆机鉴赏
内容:2.8 前面板/CRT 前面板也比较容易拆卸,需要断开CRT相关的线缆和一些
射频
线。
坛里难道没人用电子管做感应加热?
拔刀斋
13年9个月前
回复于
电子技术
内容:晶体管感应加热很早之前用三极管(不是MOS)已经可以做到13.56MHz以前无线电论坛上BA7KW(呼号名)倒卖大量这种淘汰的洋垃圾用来DIY大功率
射频
功放普通MOS作开关可以用到500KHz,线性放大十几,MHz,就是杂波大点,不适合做
射频
功放引用第7楼oki于2011-05-04 08:01发表的 :随着半导体器件技术的发展和价格的逐步降低,在感应加热电路中得到应用越来越多的应用。
树莓派图传和DIY方法
山雨欲来风满楼
1年2个月前
回复于
极客DIY
内容:惊异于0.8瓦功率的图传能用非指向性天线能打100km😨不过我觉得可以改装一下
射频
部分,整个功率大一点的PA提升信噪比(这可能会远高于豁免功率😢)或者可以思考用其他的方案实现小型化,之前见有些USB
求论坛里的HAM指导:新人玩SDR入手hackrf one 好吗?
熊猫阿Bo
9年7个月前
回复于
无线电
内容:作为HackRF One的拥有者之一,我必须说明,由于
射频
前端设计以及板载时基是在是不行,导致虽然是8位采样,但是噪声状况会让你觉得完全没有得到8位能做到的效果。
一天干一点,消磨无聊的生命。2通道干涉仪测向机。
虎哥
8年4个月前
回复于
无线电
内容:单通道干涉仪需要N个90度移相器在
射频
端工作,这就很麻烦,因为宽带移相器指标很难做好,不知是怎么解决的。
拆解一台HP8673D射频信号源
虎哥
9年4个月前
回复于
仪器仪表
拆机鉴赏
内容:比如MEMS
射频
器件,中国处于世界领先水平哟,但是人家被军品订单养得肥肥的,根本不屑于建设民用市场,于是我们只好买国外的,国外的价格便宜量又足(相对于国产而言)。
仪表局神作KC901S到手开箱上手测试图-多图杀猫
S.D.P
9年9个月前
发表于
会员海报
内容:你们也知道,我不是专业的
射频
研发人员,于是乎我就光上图,少说话好了。,右边的屏蔽壳后面应该就是
射频
测量部分了。
回 16楼(坚持and突破) 的帖子
jxs
12年7个月前
回复于
高电压技术
内容:搞
射频
还有点够呛。。
玩高压的朋友们注意了,当心电离辐射
refinder
14年0个月前
回复于
高电压技术
内容:这里不会是
射频
电磁波,因为能量太低没有粒子效应。
gongke1979
uid: 67266
浪迹天涯
机友 笔友
2
文章
6
回复
0
学术分
注册时间:2016/3/20 09:28:29
最后活动:
7年3个月前
2001年大学毕业后一直从事军工电子产品研发,擅长
射频
微波产品方向的设计和开发,现就职与航天科工集团某研究所的下属公司,从事电子对抗、半实物仿真测试、雷达系统、无线电监测测向类产品研发和管理工作。
拆解一台HP8673D射频信号源
TBsoft
9年4个月前
回复于
仪器仪表
拆机鉴赏
内容:,电子管作为一种成熟技术仍然被沿用,例如经典的雷磁25型酸度计(pH计)以及某些示波器、信号发生器、毫伏表、Q表、扫频仪等,80年代国内继续生产这类仪器的原因主要是技术成熟,性能在当时也满足需求,毕竟
射频
信号源
能否自制信号屏蔽器?这个好像真不难 ,急用!!!
暴走蟹
8年11个月前
发表于
EMP和强微波
内容:翻了一些拆屏蔽仪的帖子,发现它的结构并不复杂,用555产生锯齿波,供给一个压控振荡器(VCO),然后功率放大,每个频段三个主要元件(555、VCO、功放)就搞定了,原理也简单,就是用大功率
射频
信号在相应频段范围内扫描
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