I had a set of 220Mhz homebrew duplexers made out of copper pipe that worked better when I did NOT lock down the rod after adjustment. This avoided the problem of the threaded rod pulling the plunger up and down during heating and expansion. As long as you didn't subject the cans to any sharp movements they stayed in tune.
73, Joe, K1ike ---- skipp025 <[EMAIL PROTECTED]> wrote: > I went there with pretty good results... if you build the > plungers right you don't have a big problem with drift once > they're locked down.
