I bought multiple copies of 3DR telemetry radio modules a long time ago (about 4-5 years ago). Their frequencies were different, and it caused some issues.
I tested one of them, and the range was about 100 meters with my ArduRover. I think I might have mixed a 433 MHz antenna with a 915 MHz module.
According to this reference 3DR Radio Telemetry, the RSSI should be over 190 at a 1-meter test.
However, when I check the RSSI window, it shows “L/R Rssi: 155/188.”
What do L Rssi and R Rssi mean? I think it stands for Low and Regular.
I have a two questions:
What is the appropriate RSSI value?(Anyone can show me with their mission planner, thank you.)
How can I distinguish 915 MHz antennas from 433MHz antennas?
Because there is no label, there is no way I can’t distinguish it.
This time, I also have to comment on something. The question was about the appropriate RSSI value for the module, but your page does not include information about antenna size or RSSI. Since my antennas have the same shape and size, I can’t distinguish between them.
The module is from AliExpress, so I don’t know the manufacturer.
Because my module broke down when I tested its RSSI between antennas yesterday, I might have to buy a new one.
The first thing you should do when diagnosing range issues is the “one meter test”. Setup the two radios one meter apart and look at the local and remote RSSI. You should get a value of over 190 for a standard SiK radio.
I’m Not sure where you can see L/R RSSI. But I guess “local and remote RSSI”, hope it helps.
— EDIT：
BTW you have to check the above links and make a deep dive. There is a detailed calculation for RSSI and dbm, see below.
You will see the marker 433 or 915. And if you have these two stick antennas, the one for 433 MHz will be longer than the one for 915 MHz (You need to look at the internal metal antenna rather than the plastic casing. holybro did a good job for marking those antennas).
The L/R RSSI is 167/193, so I assumed that the local antenna is 433 MHz (the module is 915 MHz) and swapped the antennas. However, the resulting L/R RSSI is nearly the same (164/196).
What you are suggesting is what I am already doing, as I mentioned above. You keep giving me offical guides docs without reading or understanding what I am saying. It was the same when you answered my previous questions (For example, you gave me an ArduPilot debugging guide, but I had already read it and it was not applicable to the example code, putty was solution, and it was not related to guide link you gave, and I still think official guide should be modified, about example code debugging.).
I tested all the antennas, and none of them worked well.
Thank you for your effort for the community; I admire your knowledge, but I will handle it myself. As I have said four times, I just want someone to check the normal RSSI value for the Aliexpress telemetry module.
I searched my house and found some old telemetry equipment.
This works, and I am sharing the ordinary good values for the AliExpress V5 module.
The antennas I have all seem to be 433 MHz, while the tested module is 915 MHz. I think that’s why I struggled so much. All the antennas I have look identical.
