(SpamLover) wrote in message . com...
Just out of curiosity - Did anyone ever try a cabinet-sized or
room-sized cavity resonator as roof filter in a HF receiving system?

I've trawled a bit for construction details, and found that a squat
cylindrical resonator may have a radius of a quarter wave, so say...

Hi Filippo,
some experience is described by Harry SM0VPO at
http://w1.859.telia.com/~u85920178/use/cavity.htm He worked from 28
to 1300 MHz. The biggest object he used was an old galvanised dustbin.

BR from Ivan