Hello guys!
I'm one of the organizers and race directors in the Polish FPV micro drone racing league and I've been struggling with our lap timer solution for quite some time.
To quickly describe our setup:
Our laptimer (the device that measures our lap times) is based on multiple RX5808 5.8Ghz receivers. Each receiver is set up to a specific channel and when multiple drones are racing, it gets the RSSI data from all of them and looks for signal peaks. Laptimer is set up next to our start gate and when a drone flies through the gate, laptimer catches that.
The problem with the system is that often (especially on smaller tracks) drones will fly behind the laptimer or even above the laptimer and will get picked up. We managed to limit the issue by putting the lap timer inside of a metal ammo box and directing the open side of the box towards the start gate. It works much better, but it's still not great. When a drone files behind the ammo box, the signal peaks. The peak is lower than when the drone is in front of the box, but it's still high enough that it makes marshalling races very fiddly.
I'm determined to make a better solution, but I'm not sure what the best way would be. I know from our community that some people made enclosures using simple aluminum foil or copper mesh but even after grounding the mesh, the situation is still not great.
I don't know too much about RF, but I'm pretty sure things like mesh size/how it's grounded/enclosure opening size etc. make a big difference.
I'd love any help on what materials are best to use/what are the things to look out for etc. If you have any more questions, I'd love to answer them!
Thanks guys!
I'm one of the organizers and race directors in the Polish FPV micro drone racing league and I've been struggling with our lap timer solution for quite some time.
To quickly describe our setup:
Our laptimer (the device that measures our lap times) is based on multiple RX5808 5.8Ghz receivers. Each receiver is set up to a specific channel and when multiple drones are racing, it gets the RSSI data from all of them and looks for signal peaks. Laptimer is set up next to our start gate and when a drone flies through the gate, laptimer catches that.
The problem with the system is that often (especially on smaller tracks) drones will fly behind the laptimer or even above the laptimer and will get picked up. We managed to limit the issue by putting the lap timer inside of a metal ammo box and directing the open side of the box towards the start gate. It works much better, but it's still not great. When a drone files behind the ammo box, the signal peaks. The peak is lower than when the drone is in front of the box, but it's still high enough that it makes marshalling races very fiddly.
I'm determined to make a better solution, but I'm not sure what the best way would be. I know from our community that some people made enclosures using simple aluminum foil or copper mesh but even after grounding the mesh, the situation is still not great.
I don't know too much about RF, but I'm pretty sure things like mesh size/how it's grounded/enclosure opening size etc. make a big difference.
I'd love any help on what materials are best to use/what are the things to look out for etc. If you have any more questions, I'd love to answer them!
Thanks guys!