I am searching for a way to communicate with my plane from the ground, long distance away, like 10km.
I saw many people use dragonlink system for both controller radio and telemetry/command(MAVlink) link.
However, it seems it is not allowed to use them in Japan, even with license. (This part, I am actually not so sure yet.. trying hard to confirm if it is really true.)
In the mean time, I believe there should be some general purpose and legally compliant modem modules in Japan. But I don't know what kind of spec parameter and configuration I should look at. Like..
- what kind of bandwidth/bitrate is required for PX4 datalink system?
- do I just need modem modules with UART interface? Or do I need a micro controller between modem and Pixhawk and load some kind of interfacing firmware? (Sik??)
- How about the controller radio? Can I use one modem for handling both radio control input and telemetry/command(MAVlink) ? Or do I need to modems?
I actually got a license associated to myself (not to products) for commercial purpose telecommunication; and this allows me to use transmitter of 1W power, for example. (Without license, it is up to 10mW only)
Therefore, I believe that as long as there are right modules/products connected and set up, I should be able to do this long distance operation.
I dare to start this long distance operation in Japan, but I'm stuck at this problem.
Can anybody give me some comments?