Without getting into the measurements - I think you need to detune the tower if that is going to work at all. Probably put a trap in the bottom 20 feet.
Tree N6TR On Thu, Dec 21, 2023 at 6:27 AM Noel Lopez via Topband < [email protected]> wrote: > Here is my 2 cents worth. First of all, I am not an antenna expert nor do > I know how to use antenna modeling software.These are my thoughts based on > my experience and what I remember reading. My low band system is an > inverted L under a SteppIr yagi that can be retracted. This avoids the > capacitance hat effect on the inverted L. > The capacitative top hats you have on your tower make the inverted L > "appear" longer thus requiring morecapacitance to match the inverted L. > If there were no yagis to create capacitance over the inverted L, > the antenna would appear shorter and require less capacitance to match. > Capacitative matching is less lossy and more efficient than inductive > matching from what I remember. > I am posting this to see if anyone can add-to or correct my comments. > Noel Lopez NR5R > On Wednesday, December 20, 2023 at 07:52:00 PM CST, Steve Muenich < > [email protected]> wrote: > > I have an Inverted-L question that hopefully someone can answer for me. > > I installed the 160m wire to the 80 ft level on a 100 ft Rohn 45 tower > with top mounted yagis. > The horizontal (sort of) portion is approx 45ft long. > The wire starts at 80 ft down approx 5 ft from tower and when it gets to > the match box the bottom of the wire is about 10ft away from tower. > > I have about 50 or so 120 ft long radials. > > I am able to get a X=0, R=52. SWR 1.19:1 tune according to my RE Zoom using > load shunt match at base of tower. > > My question is why do I need so much series capacitance (5300pf) with > parallel inductance approx 8uh? > > Everything is working fine, but I am wanting to understand why I am needing > so much series capacitance? Does this indicate an issue I need to resolve? > > TIA, > > Steve, NA5C > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
