请教一下各位大佬，请问有开源的低通滤波器项目或相关教程吗，准备做一个短波多波段的低通滤波器，控制自制机的杂散😋

可以看下atu100的低通部分，以及各短波电台技术手册低通部分的原理图，直接百八十淘块船台的低通板也行，花不了多少钱

@"Syryia"#p45402 感谢KSR老师，那我去学习学习ATU100的电路😋

说错了……不是atu100，是atu100作者N7DDC作者下的一款百瓦功放HFPU100

@"Syryia"#p45407 @"Syryia"#p45407 OKOK，明白辣，请问这些都在哪里开源呀，平时找无线电开源项目总是找不到😭

https://github.com/Dfinitski/HFPU-100

@"Syryia"#p45410 收到收到，太感谢辣✌✌

随便找个短波机维修手册看一下，大部分功放输出LPF的电感电容都有参数。当然这些LPF的S11一般不是太好，有条件的找个仿真软件把参数怼进去再优化一下，不然电台端看到驻波会偏高

@"BH7JUO"#p45464 这个思路确实是捷径，谢谢大佬

最近正好给自己的功放配了一个LPF，参考的这幅图 [upl-image-preview url=https://storage.hamcq.cn/2024-12-18/1734543709-19460-image.png] 我担心自己焊的电路继电器不可靠导致功放损坏，因只用20米和40米波段，就用磁环绕制了这两个波段的lpf。这幅图来自于：A Broadband HF Amplifier Using Low-Cost Power MOSFETs，原文链接 https://golddredgervideo.com/kc0wox/wa2ebyamp/amppart1.pdf https://golddredgervideo.com/kc0wox/wa2ebyamp/amppart2.pdf

Problems with low-pass filters

BG2MEM

Hello everyone, I was wondering if there are any open-source low-pass filter projects or tutorials available. I'm planning to build a shortwave multi-band low-pass filter to reduce unwanted noise in my homemade radio receiver.😋

BG2MEM

Syryia Thank you, Mr. KSR, I will go to learn about the circuit of ATU100.😋

BG2MEM

Syryia

Syryia Okay, I understand. Could you please tell me where these projects are open-source? I often have trouble finding open-source radio projects.😭

BG2MEM

Syryia Got it, got it! Thank you so much! 😊😊

BH7JUO

Just find a shortwave radio repair manual and take a look. Most of the amplifier output LPFs have parameters for inductors and capacitors. Of course, these LPFs' S11 values are usually not very good. If possible, use a simulation software to enter the parameters and optimize them, otherwise the antenna end will see a higher standing wave.

BG2MEM

BH7JUO This approach is indeed a shortcut, thank you!

BG5CJI

I recently added a low-pass filter (LPF) to my amplifier, and I used this diagram as a reference.

I am concerned that the relay I soldered may be unreliable, which could damage the amplifier. Since I only used the 20-meter and 40-meter bands, I built low-pass filters (LPFs) for both of these bands using toroidal inductors.

This figure comes from: A Broadband HF Amplifier Using Low-Cost Power MOSFETs, original link.
https://golddredgervideo.com/kc0wox/wa2ebyamp/amppart1.pdf
https://golddredgervideo.com/kc0wox/wa2ebyamp/amppart2.pdf

闽ICP备2021006864号-7

闽公网安备35020602002794号互联网举报中心

用户协议隐私政策社区规范积分规则中继规则转载须知
更新日志联系我们常见问题友情链接运营报告赞助

浩奇科技（厦门）有限公司

是无线电，把我们联系在一起