Alignment and Adjustment of Synchronously Tuned Multiple-Resonant-Circuit Filters

摘要: A simple method of "tuning up" a multiple-resonant-circuit filter quickly and exactly is demonstrated. The may be summarized as follows: Very loosely couple detector to the first resonator filter; then, proceeding in consecutive order, tune all odd-numbered resonators for maximum output, even-numbered minimum output (always making sure that immediately following one resonated completely detuned). Also considered correct adjustment two other types constants filter. Filter can always reduced only three fundamental types: f0, dr(1/Qr), Kr(r+1). This true whether lumped-element 100-kc or distributed-element 5,000-mc unit being considered. dr adjusted by considering rth single-tuned circuit (all detuned) setting bandwidth between 3-db-down-points required value. Kr(r+1) (r+1)th adjacent double-tuned resulting response peaks Finally, values K Q are given an n-resonant-circuit will produce (Vp/V)2=1 +(?f/?f3db)2n.