Ok thank you very much.
Also, Good luck with your drone. it sounds very important
When using more than one in parallel, the SIK radios interfere with each other!
I use them with groups of students, with several pairs of radios running at the same time. As long as you properly set the NetID for each unique pair there hasn’t been any issues. The biggest hassle is setting the NetID in class. You need to be 100% sure that all the other radios that are still on defaults are turned off. I’m sure there is a limit to the number that can be used at once, but so far I haven’t hit it.