Hello, Looking at W6NBC's article, he warns that operating in the harmonic mode will result in higher losses. Maybe 2-3 db may not be unreasonable for this mode. The other thing he warns about is maximum diameter of the cavity. He says that the cavity diameter can't be more than 1/3 wavelength in diameter. For 1296 that would be less than 3 inches?
What are the diameter of the cans? 73, Joe, K1ike [email protected] wrote: > Hi there, > > > I've had some success rebuilding & tuning 1/4 wave cavities for 146 MHz by > playing around with loop sizes, orientation etc and being fortunate to have > had access to an HP-Agilent VNA to "help along". (W6NBC's excellent article > on cavity loop optimisation was found <after> I had pulled out most of my > hair ...but I digress.)
