Webantenna for VHF and UHF? Build a simple antenna that uses a single feed line for less than $10. Figure 2––This EZNEC plot shows the difference in the radiation patterns between a vertical half-wave radiator operated at its fundamental (146 MHz) and third harmonic (445 MHz). At the fundamental, most of the energy is directed at right WebPART 1 In this video, I compare a store bought GMRS two-way radio antenna to a DIY (homemade) two-way radio antenna! First up is the STORE bought GMRS antenn...

C ONSTRUCTION OF A N J P OLE A NTENNA FOR 2m - K8QIK

WebSep 9, 2013 · Antenna 1 Priorities are: low cost, ease of build, low swr. Antenna 2 Priorities are low swr, durability, max range in one direction. Antenna 3 This antenna … WebUse the string to pull the antenna up inside the shell. There will be some resistance as the foam spaces pass the first opening. Work it. Then remove the string. You now need to secure the top of the antenna with the top … オービス 免停期間 点数

Homemade Antennas!! - General Discussion - myGMRS.com …

WebTo mark the cap for drilling with an 1/8" drill bit is very easy. Just measure across the cap to find the center and mark a location 1/4"-3/8" from the middle on each side. The two holes … WebThe collinear J antenna improves the Super-J by separating the two radiating half-wave sections to optimize gain using a phasing coil. [29] The resulting gain is closer to the optimum 3 dB over a conventional J-pole or halfwave antenna. [29] The approximate gain in the H-plane of the Collinear J antenna is from 4.6 to 5.2 dBi (2.4 dBd to 3.1 dBd). http://clackamasares.org/wp/wp-content/uploads/2024/12/MENTORFEST_ANTENNA.pdf panzaschpile