Yes ..... zero output.
This is gonna be hard to explain I can tell.
its set for WSPR.
I hear nothing on the WSPR frequency according to the LPF I’ve built. As I’ve built 6 LPFs.
Yes I’m trying to hear it in my TS590 which next to the U3S about 6 inches away lol!!!. I’m using Slot 0 only. No relay switch kit.
Just the U3S.