2024 Efhw counterpoise

Efhw counterpoise

Author: bxdi

August undefined, 2024

http://www.gnarc.org/wp-content/uploads/The-End-Fed-Half-Wave-Antenna.pdf 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 …

EFHW counterpoise : amateurradio - Reddit

Web$\begingroup$ @BrianK1LI I believe EFHW (end fed half wave) is a most commonly used name. It is a half wave antenna (basically a dipole) that is fed almost from the end. Almost - because it requires a counterpoise ~0.05 lambda to get a non-reactive impedance. A 64:1 or 49:1 transformer is used to match the impedance (2500..3200 Ohm) of the feed ... 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 … ruby sands ballito

Does a 1/2 wavelength end-fed antenna need a good RF …

WebFeb 10, 2024 · Hi, been playing with antennas on my SOTA activations, in summer linked dipole, in winter a EFHW trapped for 3 bands. Now playing with random wire antennas … WebThe End Fed Half Wave Antenna - gnarc.org 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 … scanner software photos

EFHW works only on one band - what am I missing?

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

WebEnd-Fed Halfwave Antennas (EFHA’s) seem to be experiencing a bit of a moment right now and we’ve heard questions about the need or desirability of grounds or counterpoise … Webextensive ground like a big ferrous vehicle body, only a short counterpoise wire. It is a favorite of Summits-On-The-Air (SOTA) activators and ARES/RACES that roll it up into a backpack or toss it in an emergency go kit. Furthermore, it’s easy to build, low cost, does not require an automatic antenna ruby sanctum wotlkWebEFHW 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 … ruby sample programs

"WebApr 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 … " - Efhw counterpoise

Efhw counterpoise

WebAug 28, 2024 · Adding 0.05 wavelength wire to EFHW antenna. Using the gear explained in the previous article about these end-fed dipoles, I performed one run with an additional … WebAug 17, 2024 · Remember the coax shield is a counterpoise. Here is a little more explanation of what I was trying to do… I wanted a very specific single band antenna tuned to 14.230 in the 20m band, preferably end-fed for the location I wanted. ... With an EFHW, a 49:1 is needed for this. I used the 49:1 transformer design found on Ham Radio Archives ...

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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 … WebMar 5, 2024 · There are three main areas where you can find gunpowderfish: Coral Highlands, Rotten Vale, and Elder’s Recess. You have just as much chance catching this …

WebOct 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. … 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 …

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) … WebOct 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.

WebDec 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 … rubys and montysWebJun 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 … rubys and diamondsWebAccording 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 … rubys anaheim menuWebSep 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. ruby sandwichWebJan 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 … ruby sans fonthttp://arrl.org/end-fed-half-wave-antenna-kit ruby sanitize_sqlWebEFHW 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 my HOA restrictions. The UNUN I built has a connection for a counterpoise, but I didn’t attach one, so the 90 feet of coax that runs from the UNUN to my TS-590SG is ... scanner software receipts