Hi The narrower the bandpass of the network, the more delay it will have. The more delay it has, the more phase shift you will have over temperature. With a “low Q” T network, the phase shift is pretty small. It is likely you will have as much shift in other parts of your system as in a Q = 1 match network.
Bob > On Jul 17, 2015, at 2:23 PM, Michael <[email protected]> wrote: > > Before I waste time simulating too much... > > Does anyone have any intuition around temperature dependence of these > designs? Is one 'style' significantly better than another? > > I'm far more concerned about phase shift of the fundamental during > temperature swings than I am relative harmonic levels/phase moving around. > > Michael > >> Hi > >> But your 3 pole will not be as good as my 5 pole. My 5 pole will not be as >> good as the next poster’s >> 13 pole. My 5 added traps will not do as much as the next poster’s 13 traps. > >> What *will* happen as all of these parts are added: > >> 1) It becomes a real mess to properly lay out and align >> 2) Even with good equipment, you will need ever more accurate parts to >> implement it >> 3) The sensitivity of the result to minor parts variation will keep going >> up. (I get -180 dbc here and “only” -120 dbc 1% away). >> 4) The odds of anybody actually building one go down probably as the square >> of the number of parts involved. > >> The simple filter topology posted earlier by Charles is indeed quite >> adequate. You can get -60 dbc harmonics without >> going very crazy on the design. Part values can either be calculated from >> formulas that have existed for > 80 years >> or you can play with simulation. > >> Bob > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
