During some tests of my new 10GHz transverter I have got some problems with the antenna relay. After some time with 22 W continuous carrier on 10 GHz the actuator pins have melted (see pictures).
Maybe it's a small transition resistance which then makes the pins melt (made of synthetic material) at the high power on 10 GHz. Up till now this effect appeared only at "second-hand" SMA relays.
Clean the relay-contacts
after a longer storage.