Dual Antenna Problems

Thought id put this on here, to save cluttering Telegram / so its easier to find in the future.

Trying to get my dual-gps setup working, but having problems, have got the boards stacked / soldered up so everything can communicate, and ESP is loaded / running software no problem…

However the problem I am having, is after loading the config files to the F9P’s, they are both constantly flicking between a RTK fix, 3D and no fix, every time i gets a fix, it lasts a second or maybe less, then flashes back to no fix, over and over…same with both boards… As soon as I load the default config back, they sit stable at 3D… Wondered if it was to do with changing the rate to 10hz, but at 1hz I get the same problem.

Anyone else seen this / got any thoughts?

What’s the solution for this problem? I think i have eaxctly the same problem…