I am having trouble with interference from a GSM modem and my switch mode PSU.
I do not know much about interference and how the radiation patterns works for GSM. Below is an image of the circuit which we build for a client. The unit worked perfectly when they previously had an external antenna installed, however it was getting vandalized, so we then installed this anti-vandalism antenna. Since then, when we close the box, the switch mode PSU dies. I assume it goes into a protection mode. And you have to cycle the power in order to get it to recover.
PSU: Meanwell MDR-10-12
Now the antenna and PSU are fairly far from one another. I can simulate the PSU behavior on another unit of mine, but putting the antenna right up against the PSU. (however it doesn't immediately die, it seems random).
Questions that come to mind: