SuoYuC Thank you for your reply. Here's a brief summary:
1. Regarding the 3000, I'm not considering the antenna feed; I'll build my own. (Is "pa" a power amplifier? If so, would a new B be unable to handle it?) Also, besides the official xpa125b, are there any other relatively inexpensive 100W amplifiers that you recommend?
Two. I checked the models of a few older machines you gave me, and it seems they've all been used extensively (?). Although I do have some electronic repair skills (fixing phones, fixing appliances), I feel that if these models develop problems, I probably won't be able to fix them, so I'm not considering them.
III. It's definitely a low-power setup that can be frustrating. For example, during the recent WAPC competition, I tried using BH3GEX's equipment (less than 20W) for general communication (more accurately, to learn how to use low-power radios for general communication). My voice was strained, but I still couldn't make any successful contacts (using a vertical antenna). (I believe the device was a Q900 from Guhe, but its machine is slightly off frequency at 22MHz and hasn't been used on 28MHz yet.)
Four. Does "X6100 series broadcast" refer to receiving broadcasts on the amateur band? I checked briefly and it seems that G90 also has this problem (possibly a common issue with XieGu, except for the X6200). How can this be resolved? (I haven't found a solution online, or perhaps I was too tired to find one.)
Five. That means B's new question bank hasn't been released yet? If I study the old question bank in advance, will it still be useful? Are there significant changes between the old and new question banks?
Finally, thank you for your suggestions.
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