> What type/model/brand/size of cavities were you using? The
> first thing that
> comes to mind was that the cavity you were attempting to use?
>
> --- Jeff
Sorry, hit send too soon.
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
