I have a project where a VHF/UHF "walkie talkie" is active and very close to the arduino.
It emits at high power (1W to 4W) and I noticed that the arduino does weird things: it resets, it "stops", the serial doesn't write anymore, ....
I noticed that UHF frequencies are less harmful than VHF.
I tested it with multiple arduinos with the same results.
Do you have any idea on how to shield the arduino from this EMI? It's already inside an aluminium box and the walkie talkie kills it even at 30cm distance. I can't increase the distance more.
RF is getting inside your box via the wires - normally you'd use feed-through capacitors to allow low frequency signals and power into the shielded box while excluding RF. Ferrite toroids can also help isolate RF.
However the best solution is always to keep the transmitter antenna well away from the circuitry, so a remote antenna on a metre or more of coax would be another method.
When your circuit is a few cm from the transmitter, it interacts very strongly with the antenna and every wire will pick up and reradiate RF power. You want the circuitry to be many wavelengths distant from the antenna.
Hi,
What have you external to the box got connected through the box to the controller?
Is the box connected to the controller gnd?
How are you powering your controller?
What model Arduino are you using?
