Hello, Mabe some of the old 'bakelite' ones are pretty poor, but the ones I remember were made of white porcelain (I think) which should have good RF properties. 73, Tom G3OLB < .... the one I use is
Mabe some of the old 'bakelite' ones are pretty poor, but the ones I remember were made of white porcelain (I think) which should have good RF properties. 73, Tom G3OLB Doc.
I have read that these old knife switches have very poor RF insulation qualities. Perhaps this effect is frequency and/or power sensitive (for want of better terminology) to some extent. Doc. Tom, G3
Tom, G3OLB: Years ago I remember my grandfather having a wireless aerial (as it was known then) down his garden which came through an insulator in the window frame and was connected to a ceramic knif