After a month of work, our homemade USDX and Box6 systems successfully passed testing in Langfang without any external components. This is likely the first such successful self-made test system in Langfang.And the second partHomemade amateur radio station.
Please include one free pain relief packet.
The entire process can be described as quite challenging. Since no one in Langfang had ever performed self-inspection before, it was essentially a case of "knowing nothing and asking everything" (i.e., lacking knowledge of relevant laws, inspection standards, and standard procedures). However, the friendly and helpful attitude of the young lady at the frequency station made it possible to implement a self-inspection process with all necessary materials and in compliance with the procedures. Therefore, those who go to Langfang for self-inspection later should find the process much smoother. I hope this experience will help those who are going to perform self-inspection in Langfang in the future, reducing potential difficulties for both parties.
End-to-end:
1. Contact the relevant authority to report the situation.
2. Prepare the necessary self-made documentation (such as schematics, BOM lists, photos of soldering and debugging processes, etc.), a reference table for RF technology (specifying operating frequency range and transmission power), and equipment usage manuals (for technical use in testing).
3. I should call you in a few days to let you know the results of the testing.
The first time I used it, I didn't have any experience or instructions, and I tried fiddling with the technology for a long time without being able to figure out how to use my abstract hand-held device.
Additionally, I left a note for Langfang without Tube: they haven't fully understood the GB/T 32658-2016 standard and are unable to provide a clear explanation. I hope that future collaborators will continue to work on this issue so that subsequent collaborators can benefit from their efforts.
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