2024 Efhw counterpoise

Efhw counterpoise

Author: nari

August undefined, 2024

WebI've tried it several different ways, and the difference is hard for me to tell. I've seen advice to put the counterpoise perpendicular to the antenna wire, or parallel to the wire (under it) … WebSep 14, 2024 · The MFJ-1714 with and without the additional 1/4 wave counterpoise “tiger tail” is in yellow. Keep in mind this is NOT antenna gain, but effective radiated power that includes power from the radio plus the gain of the antenna. Since a little asymmetry exists in the MFJ-1714 graph plots, understand…. +90 is when the top of the antenna was ...

Highly Efficient L-Matching Networks for End-Fed Half-Wave …

WebCounterpoise: The coax shield isn't "ideal" but it definitely can work fine. I do not have a counterpoise on my EFHW, and I regularly run my Henry 2k4 at full power into it. No problems with EMI or "rf in the shack". It helps if your antenna is matched, as mine is, without the use of a tuner at the radio-side. WebNote that the point of this article is not to provide definitive values of impdances vs. length (since many factors influence this result), but rather to show what happens as the counterpoise length approaches zero. We … bons gynaecology

EFHW - SOTABEAMS

WebEFHW antenna without a counterpoise may well give rise to problems of various sorts; a counterpoise should not be longer than a quarter-wave; a resonant half-wave will … WebCounterpoise: The coax shield isn't "ideal" but it definitely can work fine. I do not have a counterpoise on my EFHW, and I regularly run my Henry 2k4 at full power into it. No … bons goodgame empire

20m End Fed Half Wave (EFHW) Build - GetHamRadio.Com by …

WebJun 11, 2024 · End-fed half-wave (EFHW) antennas provide a convenient way to move the coaxial feedpoint for a half-wave antenna from the center to one end. ... Sometimes, the counterpoise is provided by the coax that feeds the L-matching network, in which case the feedline will definitely carry common mode currents that will tend to spoil the antenna … WebSep 18, 2024 · Some commercial EFHW antenna manufacturers (salesmen) state that a ground/counterpoise is not needed (except for safety/lightning protection; true). They rely on the uncontrolled, random capacitance between the coax feedline shield (or your body/radio) and the lossy soil to complete the circuit. Not real good. god eater gpop.ioWebDec 1, 2024 · The good news here is the counterpoise only has to be about 5% of the wavelength at the lowest frequency of the antenna. Therefore, for an 80M end fed antenna, the counterpoise has to be approximately .05*80M = 4M = 13.12 feet. ... This is the BEST EFHW article I have ever read. I have built several EFHW antennas using commercial … god eater graphics on blender

"WebJul 20, 2024 · With very little counterpoise, the antenna is being fed at a high impedance point so a rather large impedance step-up is employed. ... In the case of the EFHW 49:1 … " - Efhw counterpoise

Efhw counterpoise

Playing with end-fed wire antennas and 9:1 ununs

WebJan 24, 2024 · 3. No, it is not needed, but it can improve the antenna system. An EFHW is simply a half-wave length of wire and a matching device, and that's it. Counterpoises are … WebEFHW antennas might have elevated SWR readings on some bands due to the different position, height above ground or impact from nearby objects. ... Also, do not listen to internet “experts” saying that some form of hanging …

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WebLaurence, WA2TLY, is asking some questions about a few aspects of the EFHW 80-10 antenna, Why they are there and what they are for? Watch to learn more.Subsc... WebI used some stand-offs for the secondary and a terminal block glued to a small block of MDF for the primary. The coax is soldered to the primary, the terminal block is just to hold it in place. There is a counterpoise …

WebI could run 1/4 wave radials in several directions along the ground/just below the surface and feed the inverted L just a few feet off the ground, giving me a longer vertical section. Another option I'm considering is feeding the inverted L at a height of about 10 feet, giving me a 20+ foot vertical section, along with elevated wires at about ... WebSep 14, 2024 · The MFJ-1714 with and without the additional 1/4 wave counterpoise “tiger tail” is in yellow. Keep in mind this is NOT antenna gain, but effective radiated power that …

WebEFHW Counterpoise. For the last few months, I have been operating a homebrew 40-10 EFHW that runs just above my roof. It’s my first HF antenna, and is a stealthy solution to … WebAug 12, 2016 · Actually, the 9:1 ratio is kind of magic, because 9 is the square of an integer. Your unun has integral numbers of turns in its primary (9 turns between the counterpoise and the radio tap) and an integral number of turns in the secondary (27 turns between the counterpoise and the antenna with 9 of the turns common to both primary and secondary).

WebThe EFHW performs similarly to a resonant, half-wavelength dipole on 80 meters, radiating best broadside to the antenna. As long as the impedance at the end of the antenna is suitably high, the SWR ... generally not critical but it is helpful to understand feed line interaction and counterpoise function. In Figure 2A, the ground attachment ...

WebIt is important to use a counterpoise. A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6.5' for 20m). ... therefore, is either a more … bons gratuits a imprimerWebOct 13, 2024 · Echolink Project on 985. End-Fed Halfwave Antenna, Do they need a counterpoise, or not? Getting Started with Echolink and the 985 Repeater. Hints & Tips. ICOM SET UP 9700/7300 for digital modes. Listen to the 146.985 W3GMS live feed. LOG, Loop On Ground, RX Antenna. Mobile Stations of 985 / Mobile Ham Radio Install Pics. god eater highest damageWebJan 18, 2024 · It needs a counterpoise (including the mantle of the coax cable, the TX and the operator, hi). A 40m long wire is about multiple half wave (i.e. high-impedance) on 80m, 40m, 30m, 20m, 17m, 15m, 12m, … god eater heavy moonWebAccording to Moxon [], because of the very high impedance (i.e., very low current) at the end of a half wavelength antenna, only a small counterpoise (1m @ 14 MHz) or a few pF of capacitance to ground is required to … god eater hdWebAug 6, 2024 · The counterpoise will need to be about .05L in length (at the lowest frequency of operation). To build a EFHW Broad Brand Transformer with an inbuilt CMC … god eater god arkWebApr 5, 2024 · Unlike 1/4 wave verticals that require a fairly robust counterpoise / radial system for effective operation, the counterpoise requirements for a half-wave are far less-demanding. ... Great job, Steve. I have two EFHW’s (commercial units from myantennas.com) – one for 80 through 10 meters and the other (in a perpendicular … bon shabu koreatownhttp://nx0g.org/miscfiles/Understanding%20the%20EFHW.pdf god eater hilda