> I had a set of homebrew 220Mhz duplexers made out copper pipe > that would drift with temperature changes.
"Inch and Five-Eights" hard line should not change value nearly as much as the same circuit home-brew from copper pipe. > I built a plywood box, put them inside, and added a small lightbulb > controlled by a thermostat. This kept them very stable. Can't argue with the above success unless you're the one paying the power bill. > There's no reason that you couldn't do the same thing for the > coax duplexers. Not very pretty, but effective. Probably not required. I often use reverse temp caps to track and trim temp changes the other way. cheers, s.
