I have two ultra small/sub-miniature coaxial connectors on my circuit board - one for a cellular (4G) antenna and one for a GPS antenna. I accidentally connected the cellular antenna to the GPS connector and the GPS antenna to the cellular connector.
With the wrong setup, I powered the device and started seeing errors when trying to get the GPS signal through AT (modem) commands. However, when I connected the antennas properly the errors went away and I was able to get GPS and cellular signals. The board seemingly functions fine now.
What can go wrong in this case? Is there a chance I could have damaged my circuit board or the antennas with a setup like that? If so, then why?
Schematic for the antenna connectors: