Jeff, Will get back to you on the 450MHz cavity model # later (They're at work). Must have missed the W6's comment about can size for other modes. I'll re-read with the concentration factor wound up a notch...
In your experimentation, were you using 4" diam 450 MHz cans operated at 3/4 wave for 1296 or 4" cans at 1/4 wave (stubbies !) for 1296 ? Just checking ... Thanks, Kit --- In [email protected], "Jeff DePolo" <j...@...> wrote: > The first thing that comes to mind was that the cavity you were attempting > to use had geometry that was causing undesirable moding. If this was a > conventional two-loop bandpass cavity, sweep it over a wide range, look for > any unusual responses such as a "second bump" in the pass response > well-removed from the center resonant frequency. > > From my experimentation, 4" diameter UHF cavities seem to work OK at 1.2 GHz > from a resonance standpoint. > > --- Jeff WN3A >
