Huang
1. It's not mandatory to have a certificate, but you need to have an operating license number. You can use it to search on Zhihu.
2. Yes, this usually refers to the pairing that occurs during the initial application for a license. However, there may be specific situations in certain regions, so it's best to consult with your local association or relevant government department.
3. Yes, the license grants permission to use the equipment, and you must provide the equipment's serial number when applying for the license. The specific application process varies depending on the location, so it is best to consult with your local association or industry and commerce bureau.
4. I don't know much either, so I can't answer properly. Let's see what others have to say.
I have only recently become a ham radio operator, and I am providing this information based on my own experiences. If anything is incorrect or if my answers are not satisfactory, please forgive me.