Counterpoise for end fed antenna. Some reading that might help - aa5tb. Learn placement tips, choke use, and coax length adjustments for accurate results. Correct or incorrect? May 14, 2022 · An end fed isn’t really an end fed, but a highly off center fed, off center fed dipole. Dec 7, 2022 · For a non-resonant end-fed, what are the recommended counterpoise lengths for 160-80-40-20-17-15-12-10 meters? Is there an advantage of having 8 different counterpoise lengths and will 8 improve usability vs. In a ground plane antenna, it flows through the radials and possibly a ground rod. That’s why you don’t need a ground connection or counterpoise when using a balanced antenna except for static/lightning purposes. Thus the need for a short counterpoise (so 5 to 15% of the antenna is on the other side of the transformer/balun) to optimize the impedance match. A choke near the antenna helps Feb 10, 2020 · Hi Declan, I’m a dipole man, but when I looked into trying end fed antennas, it seemed that most sources were staying that a counterpoise need not be very long. Figure 6 - SWR vs "Counterpoise" Length vs Turns Ratio for an End Fed Half Wave Free Space Antenna The graph below (fig. . Optimize SWR measurement for end-fed antennas using coax as a counterpoise. com AA5TB - The End Fed Half Wave Antenna The End Fed Half Wave Antenna explained by AA5TB. In a dipole, it flows back through the leg connected to the coaxial shield. The place where a 9:1 or 49:1 transformer balun matches the off center impedance isn’t at the very end, but close to the end. 1 counterpoise? I presume since the antenna portion of the system is not resonant, neither should the counterpoise (s). 7) is of actual measured data of an end fed half wavelength antenna with an isolated coupler using an 8:1 turns ratio. May 3, 2025 · Every Antenna—Including an EndFed—Needs a Counterpoise To radiate effectively, any antenna needs HF current to flow out and return: the return current. When using unbalanced, end-fed antennas like mobile whips, verticals, random wires, rubber ducks and EFHA’s, we need some form of a return path (the “other half of the dipole”). gmog ozulz ozjohn yruuksc drqin vdjv yxqj ulcu ukp hjm