WebNov 1, 2003 · Antennas. 5/4 Wave 2 Meter Antenna 70cm Collinear Antenna From Coax Home Brew A 4 To 1 Balun Copper pipe dipole antenna construction for 2 Meters … 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
Collinear Coaxial Antenna Design Calculator - jeroen.steeman.org
WebJul 15, 2024 · A coaxial Collinear antenna for 2m and 70cm mostly made from junk bits and pieces for less than £1 Oxford Shortwave Log 7.43K subscribers Subscribe 86 7.9K views 2 years ago Hi … WebSep 28, 2013 · Colinear with good performance almost for free Here is the performance graph of my almost costless colinear 10 element antenna made from RG59 cable ends.The cable setting is occupied in a leftover 3/4 inch PVC water pipe and my device is a RTL 1090 DVB-T dongle from China.The RG59 cable costs about 1 $.The two ends of the pipe are … impact parents adhd
Quarter Wave Dual Band VHF/UHF Ham Radio Antenna by
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). WebDIY GMRS base / repeater antenna prototype ElfNet Designs 1.95K subscribers Subscribe 83 Share 6K views 5 years ago Ok so this is my first prototype build of a UHF GMRS … WebA dipole for the GMRS frequencies would only be ~35cm long. You'd be better off with a J-Pole or a ground plane at home. paazig • 5 yr. ago. There's a good Android app called … impact paris forum