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At my dipole's feedpoint I have a coil of rg8 mini coax
wrapped 6 turns in a 2-5/8" dia circle. I found a program for calculating coaxial traps for dipoles and here are the numbers it gave me: Form diameter 2.375" Coax diameter 0.242" Capacitance/ft 25.20pf Turns 6.000 Coil length 1.45" Coax length 50.30" End sensitivity 99.130 khz/inch Turn sensitivity 257.94 khz/inch Length/Diameter 0.550 Inductance (L) 2.342 uH Capacitance (C) 105.620 pF Reactance (X) 148.90 ohms The program says this coil is resonant (?) at 10.120 mhz Now here comes the really dumb question - will this cause a problem on 30 meters? I seem to hear OK but I've not yet tried to make any contacts... My SWR meter indicates a 3:1 SWR there but my nifty Z11 autotuner tunes it just fine....... What am I not understanding here? Ken KG0WX |