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80M 波(3.5xxMHz)简单发射电路
jrcsh
13年3个月前
回复于
电子技术
内容:发
射频
率在3500-3600KHz内预选定,载波发射功率大于0.8W, 电码键控载波发射(CW),电源为DC9V, 配有内接1#电池盒。
KC901K、KC901J、KC901R固件升级指南及固件下载
kcma
7时20分前
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科创仪表
内容:相比于0.05版本,有以下改进:1、增加
射频
信号源功能;2、增加增强响应校准;3、合并其它硬件驱动分支;4、RBW 6K改为3K;5、修复气压计读数偏差过大问题;6、修复全功能校准会抹掉频谱校准数据问题,升级注意事项:升级后,需对
射频
信号源进行校准。,选择“
射频
信号源校准”,按提示操作,即用同轴跳线经10dB衰减器连接1-2端口,再点击OK。,修改功能:按RUN/STOP键0.5秒,进入“停止”状态,此时数字处理部分彻底断电(此前只切断
射频
部分电源),实现更深度的省电。
谁的创意能够阻挡电动车被盗的洪流???
混吃等死
17年10个月前
回复于
极客DIY
内容:个人认为不管是自行车还是机动车,防盗的终极方法应该是:ipv6.以及大面积实施的
射频
芯片技术。
监测侦察接收机KC908简介
kcma
3年6个月前
发表于
会员海报
内容:基于监测接收机的多用途
射频
分析仪,内置信号源、频谱仪功能。
海量清仓处理,有盖格管、正比计数器、音频分析仪、电源等--活动已结束,请勿再汇款
虎哥
11年4个月前
回复于
跳蚤市场
内容:03-贴片阻容元件 杂 05-铝合金机壳 20-摇表 31-电源 35-同轴电缆 :hambaby(运费到付) 07-废板 10-基站的
射频
板 28-邻频调制器 38-PCB 40-内存 :warmonkey
贺新版开张,旧闻重发:走近诺贝尔奖大师K1JT
虎哥
12年10个月前
发表于
无线电
内容:这项工作把他的
射频
电子学实用知识和对科学的热烈追求结合到了一起。
用NE555实现ZVS的又一方法
坚持and突破
12年0个月前
回复于
电子技术
内容:相反用PLL加CLASS-E结构就很容易控制....实现软开关,而且频率可以做的很高,到达
射频
频率。
新作品!激光PCB打印机,再不用感光和热转印了,精度超高
csaaa
9年0个月前
回复于
电子技术
内容:还有一种就是
射频
方面的开发,各种形状的天线,板厚度,介质材料,馈源,甚至过孔位置和数量都对天线的性能有影响,如果每次都去工厂开,耗的就是时间,而用本机做个2.4g的板载天线20分钟搞定,立即可以测试。
关于电热炮超高速连发的想法
badboy-fly
11年11个月前
发表于
电磁炮
内容:然后认识一下一件超高
射频
的武器——金属风暴 金属风暴发射系统无传统的机械操作部件,主要由装有弹药的枪管、电子脉冲点火节点、电子控制处理器等组成。,金属风暴不仅仅抛去了机械操作部件还提高了
射频
(射击频率)同时还把弹壳给省了 =========================接下来就引入正题了=============================
请教监测用接收机设计思路。
forkeureka
9年4个月前
发表于
无线电
内容:在此向各位坛友求助,请各位熟悉软无或者
射频
监测的朋友不吝赐教,提出宝贵建议。
【继续原创】一块凝固的气体
彼岸江山
16年0个月前
回复于
极客DIY
内容:间苯二酚甲醛气凝胶(
射频
气凝胶)是在一种类似生产白炭黑。
[求助]压控震荡器max2605 DIY 50MHZ频率对讲机(发射机)
987518529
3年1个月前
发表于
无线电
内容:我不太懂模电,我是这样理解的,10k可调电阻给芯片一个基本的电压,确定一个发
射频
率。
俄罗斯有人把stm32便携sdr做出来了
actionchen
4年11个月前
回复于
无线电
内容:毛子哥已经说过了,他原理图设计的时候250-400M的时候
射频
开关引线走错,这一段得从AM端口进入。
以色列开发出新型无线电源可传输100瓦电力
mass_lynnxy
17年1个月前
发表于
电子技术
内容:电子标签通常由阅读器和标签构成,阅读器利用天线在周围形成磁场,与阅读器发
射频
率调谐的“标签”从磁场中获得能量后转换为电信号发送给阅读器。
KC新产品即将问世:400MHz—3GHz宽带手持天线
虎哥
11年7个月前
发表于
仪器仪表
内容:上述增益是采用原装的1.5m
射频
电缆时的增益。
[转帖]2007年度十大“酷炫”IC揭榜!
mass_lynnxy
17年1个月前
发表于
电子技术
内容:Othello-3T AD6552是ADI为支持3G TD-SCDMA标准专门设计的第二代
射频
收发器,并且是对ADI的TD-SCDMA基频芯片组(包括SoftFone-LCR和SoftFone-LCR+,AD6552通过取消发送路径通常需要的表面声波(SAW)滤波器,简化了3G无线手机
射频
部分的研发,从而节省了成本和印制电路板面积。,另外,AD6552整合了各种单芯片手机
射频
设计所需要的全部电路,包括压控振荡器(VCO)、储能电路、环路滤波器和电源管理电路。,新推出的“单片3G手机”方案BCM21551将高速HSUPA 3G基带、多频带
射频
收发器、支持增强数据速率(EDR)技术的蓝牙2.1版、调频收音机接收器和调频收音机发射器(用于汽车立体声音乐播放)集于一身
nanoVNA矢量网络分析仪的原理浅析
该用户不需要名字
4年6个月前
发表于
仪器仪表
内容:我目前也不是
射频
或数字信号方面的专家,所以有问题欢迎指出,太难的问题我也没法回答。,关于本文:着重于定性上理解它的工作原理,默认读者具有一定的
射频
基础,大致了解矢量网络分析的原理。
KC908频谱仪软件缺陷/功能意见征集(BUG报告帖)
Kana
3年1个月前
回复于
仪器仪表
内容:补充:在进一步测试中,还发现“
射频
组件温度”一项的值固定在36℃,无论机身实际温度多少,都不再变化。
KC903无线电通信综合测试仪 自诊断逻辑
kcma
5年5个月前
发表于
仪器仪表
内容:上述第(5)项,是因为有些自诊项目需要前面的项目都正常才能进行,否则没有意义(比如,信号源
射频
故障,则无法诊断接收机),此时自诊必须中断退出,因此,如果自诊中断,则错误代码并不代表全部情况。,对于
射频
部分,基本方法是用设备自带的场强表、接收机采集设备自带的信号源的输出。,假如示波器检测音频源正常,而
射频
检测不正常,则判定调制器或接收机有故障,反之则判定示波器有故障,以此类推。 ,如果AF信号源(DDS)、
射频
信号源及其处理回路、接收机回路及调制分析器有任何一部分故障,最终就无法得到正确的调制频偏数据。,1、基本自诊 基本自诊不依赖
射频
电路,主要检查预设的反馈点和外观目视检查(该项不做判定)。
【转】 GBPPR EMP实验 1 英文
初中学生ZYX
9年5个月前
回复于
EMP和强微波
内容:最“真实世界”的脉冲发生器的目的是为超高频或微波
射频
波段采用机械腔调谐。,微波
射频
能量的波长越短,在目标电子器件中被耦合到电路板的痕迹是理想的。
【KC出品】KC901H手持式标量网络分析仪(含频谱场强功能)团购帖
虎哥
12年3个月前
回复于
会员海报
内容:901供应给混频器的
射频
功率约50mW,输出到电桥前的功率最大接近100mW,电桥有6~7dB的损耗,所以输出才为10mW左右。
谈一下最近很火的自激特斯拉小线圈的调试方法 [经验]
rb-sama
9年2个月前
发表于
高电压技术
严肃内容: 教程/课程
内容:在
射频
的影响下,可能由于线径的原因,导致阻抗比较大,后来把线圈位置上移一点,电弧强度和功率就上去了。,
射频
下其实趋肤效应比较明显,次级线圈能烧烫。
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:请先用仪器测试
射频
连接线的插入损耗( 连接方式如图 ),并在测试时晃动连接线和接头,确认没有接触不良的情况,插入损耗稳定,不随晃动而改变。
拆!欣赏一下惠普(安捷伦)公司的仪器内部
1211
17年3个月前
回复于
电子技术
内容:所有高档
射频
仪器都必须依耐进口。
【大新闻】可靠消息称 业余无线电台 新管理办法 已于10月17日通过,2012年11月1日发
nmjnsjj
12年2个月前
回复于
无线电
内容:对业余无线电台专用无线电发射设备进行型号核准,应当以《中华人民共和国无线电频率划分规定》中有关无线电发射设备
射频
技术指标的规定为依据。,业余无线电台专用无线电发射设备不得用于其他无线电业务,其发
射频
应应当在业余业务或者卫星业余业务频段内。
RFS为上海地铁提供覆盖解决方案
mass_lynnxy
16年5个月前
发表于
电子技术
内容:每个高功率远端机能将光信号转化成
射频
信号,并将其放大,保证足够的信号水平贯穿整个隧道。
开启业余卫星通信之旅:它比你想象中更简单
科创喵
3年10个月前
回复于
无线电
内容:定向天线定向天线最主要的优点是有很好的增益和方向性,能将
射频
能量集中在一个方向。,图2 碟形卫星天线馈线馈线在地球站通信系统中起传输信号的作用,通过它将天线接收的信号传给前端系统,前端输出的信号也是由馈线传输到天线;它的唯一目标是尽可能有效地把
射频
功率从一端传到另一端。,图3
射频
同轴电缆所以有经验的爱好者使用低损耗的同轴电缆。
使用PlutoSDR接收GK-2A气象卫星的云图
该用户不需要名字
2年10个月前
发表于
无线电
极客DIY
动手实践: 实验报导,严肃内容: 教程/课程
内容:然而,想要完全复现本文中的结果,是需要相当程度的编程、硬件和
射频
的能力的。
PCB上射频线转弯和嘉立创PCB高频性能的实测(增加过孔测试图)
量子隧道
7年8个月前
回复于
电子技术
内容:这是昨晚把PLL bank固定下来的结果,还没调
射频
功率。
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