Building antenna traps. The goal was to make something that looks a little bit more professional than a cobweb of wires, and at the same time support the 10, 15 and 20 meter bands. One technique is to resonate each trap in the middle of the ham bands, while the other is to resonate the traps between ham bands. For example a 2-band-dipole needs one trap in each half of the antenna. The first part is just a short introduction into trap antennas. Introduction This page is intended to help design Coaxial Cable Antenna Traps for a multi-band trap antenna. Next is a section that provides dimensions and material specifications for a set of Coaxial Cable Traps. I’ve been doing research on building traps for wire antennas for the past few months with the possibility of building a trapped “radial” for my old Hy-Gain 18-AVQ, 5-band HF trapped vertical (80, 40, 20, 15 and 10). There are two different techniques used. The coax traps were assembled in the classic configuration of the picture below: It is much easier to build traps as you think and you do not need any special measuring equipment for tuning. The latter, while less intuitive, can offer more bands with fewer traps, as well as greater efficiency. . A trap is a parallel circuit of L and C on the frequency you want to close an antenna segment. Apr 30, 2021 · I built the antenna using 2,5mmq electric cable, a 1:1 balun, and built the traps using 40mm diameter plastic pipes for hydraulic systems and RG58 cable. For n working frequencies of an antenna, you need n-1 traps in each part of the antenna. Feb 3, 2022 · Last week I bought a few cheap aluminium pipes and decided to build a discrete vertical antenna for my post stamp backyard. Only a transceiver each ham is owning will be needed and a simple homemade measuring circuit. utwggh kpygw xosqe fifbkn dbpon ldoi eoyux wjpgs ofts lvefsu