A hairpin or a parallel matching inductor should be adjusted this way: 1. select inductance (hairpin length); 2. adjust wire length for the desired resonant frequency.
Repeat 1 and 2 until you get SWR = 1 at the desired resonant frequency. Do not attempt to adjust resonance via hairpin length! But in most cases inverted L needs no hairpin, only the wire length should be adjusted for desired resonant frequency, and a satisfactory SWR follows automatically. Please note that the hairpin adjustment is NOT a substitute for wire length adjustment. 73, Sinisa YT1NT, VE3EA _________________ Topband Reflector
