At 6/28/2008 23:30, you wrote:
>"need to be re-tuned?" Depends on who you are, where the >equipment is, what type of duplexers you have and how they >are set up. > >I can make a strong case for both yea or nay. > >One of the larger players in the choice to to re-adjust is >the Q of the duplexer cavities. Some of the really high-Q large >diameter bottles have some fairly sharp F-center band pass and >reject points when they're cranked (adjusted) up for high >performance applications. I'm going to disagree here. Gary said he's only moving 12.5 kHz, & I've never seen any coaxial resonator in common use (that means VHFLB cavities being used @ UHF don't count) that has enough Q that 12.5 kHz is going to make a significant difference. I say don't bother having the duplexer retuned unless you think it would need retuning without any frequency change. Bob NO6B
