https://www.ab4oj.com/nsprog/hf_xcvr.pdf 看了觉得总结的不错。。。适合大部分接触HF的HAM

短波的一些基本知识，不错，挺有用，谢谢分享

Here's a link that I found particularly useful:

https://www.ab4oj.com/nsprog/hf_xcvr.pdf
I found the summary to be quite good... Suitable for most HF enthusiasts.

Some basic knowledge about shortwave radio – it's good and useful, thanks for sharing.

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