Paul, By doing this you are actually tuning out the inductance caused by the longer than resonant wire by adding a series capacitance near the same value.
Herb, KV4FZ On Sun, Feb 4, 2018 at 8:35 AM, Paul Christensen <[email protected]> wrote: > >"Another technique that is often used for matching is to make the wires > much longer than resonant (that is, resonant around the top of the BC > band), so that the feedpoint Z is 50 +jX ohms (that is, inductive) on 160M, > and tune the capacitance out by adding a capacitor of equal value in > series. NEC can easily model this." > > When over-resonating with a long T-top, the maximum current point moves > away from the ground and up toward the center of the vertical radiator -- > another benefit. Unless there's a deliberate need to resonate on the > operating frequency (e.g., with some phased arrays), then over-resonating a > single T-top vertical radiator should be the objective, subject to the > availability of long, tall supports on either side of the vertical section. > > Paul, W9AC > > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
