Results: I could never tune 80m but now I can.
1:9 voltage unun_v1 9:1 voltage unun (1.8 - 30MHz) T-200-2 powdered iron toroid zelf vispate maken core.Best 73 Kelvin, G4ZTD The WA6GUZ Installation!The problem with scramble-winding is that the first and last turns of the coax may touch each other.Another "name" for it is the air choke.The balun kiko make up belgie cured this as well.It is for this reason that I chose to not include the balun as an integral feature of the T-Match network, opting for the flexibility of an outboard balun and the ability to trial various baluns subject to the antenna system and impedances presented.He also says it's a big improvement over the dipoles he had on those bands.
Photos courtesy Bill, KI4PCB, using 4 " PVC form Notice the screw terminal block used for connections KI4PCB "Ugly Balun" on the air!
He installs an S0-239 in the bottle cap and antenna connectors on the other end!An additional evaluation of the efficiency of the balun was preformed by simply measuring the RF power at selected frequencies fed into the balun and measuring the out put power from the balun using the set up shown in Figure.They work!." 73 de Eduard (YV5GRB) Below are some ideas from Kelvin, G4ZTD Balun shown attached to vertical antenna Antenna connector end shown Balun shown mounted to gray pipe SO-239 end I used 21 feet of rg58 on 4 inch drain pipe, I used clear 3mm plastic.Build an All Band HF Air Core 1:1 Choke Balun, tHE "ugly balun introduction.Whats more, the transformation, SWR and return loss are near perfect.