1. If you already have experience with tin soldering, you can consider assembling your own radio. I still recommend getting your B license first, then learning how to solder, and then purchasing a kit. I've always recommended the ADX-S – a fantastic DIY radio that supports seven bands of digital modes and has a 5W output for communication with ground stations. It doesn't cost more than 4000 RMB.400 yuanFor more details, please contact Mr. Rong from BD6CR (WeChat official account).
Furthermore, it is a digital protocol designed for low/micro-power applications, which can overcome the limitations of QRP and prevent frustration due to weak signal strength. Compared to CW (continuous wave), FT8 is more like a relaxed mode that's easy to get into.
2. When choosing magnetic rings, be sure to check the specifications carefully and don't rely on AI-generated information. I know of a size coding system that starts with "FT" (such as FT32-43), as well as Fairrite part numbers. You can purchase iron oxide magnetic rings from the United States through Liuchang's overseas purchasing page, using suppliers like Mozew and Dejie, which will include customs duties (you won't believe how cheap it is – just a few dollars for customs). Alternatively, you can copy designs like Unibalun and @Electwave's small-power end-feed magnetic rings, or buy directly from Xianyu. The cost should be kept below 30 yuan.
3. It is not recommended to permanently install the antenna unless you have thoroughly assessed the safety aspects with the school beforehand, and a surge protector is also an additional expense. The J-shaped antenna you mentioned is a variation of a full-wave antenna; the short wavelength is too large for it (making installation difficult). In fact, I still recommend using a dipole antenna (GP), which does not require a balun or unun. This 1/4-wavelength antenna is easy to store and deploy (I have a DIY guide on the internal website), but you also need to lay down a ground mat.
Feed antenna（EFHW）Actually, it works fine, but one end needs to be pulled up high. This type of cable is typically used for guy wires and requires a balance between its own weight and tensile strength.
4. For the cable, buy one that's about four to five meters long. Use connectors with M-type or BNC heads – these are designed for practical use. SMA/SMB connectors are too fragile. Operate in a shaded area. Don't make it too long; longer cables have higher power loss. I also don't recommend remote operation = = If the situation is poor, address it immediately.
5. If you really need a desktop computer, then getting a 13-inch portable laptop would be the best option (you can even find a used one for only a few thousand yuan). Also, if you use FT8, there's a software called FT8CN on your phone that has all the necessary features, so you won't need a desktop computer.
I believe that, with all the components, I can complete it for under 600 yuan. (DIY radio: 400 yuan, GP antenna: 110 yuan, attenuator: 30 yuan, cable: 30 yuan; excluding computer). I hope your club activities progress and you have fun.
6. Additionally, you could try DX communication on the 144 MHz band, which is very popular in Japan. However, it requires a bit of luck. You might consider starting with building your own Yagi antenna (with a budget of approximately 50 yuan, using PVC pipes and stainless steel rods). If resources are limited, listening to signals can also be an interesting option. Recommended equipment: RTL-SDR V4, around 280 yuan.
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