End Feed Half Wave antenna for SOTA. 31. January 2022 OE9IHR Leave a comment. As SOTA is becomming more and more an issue for me and I would like to act not only as hunter, but also as activator, I decided to build myself a multiband EFHW antenna. My choice fell to the EFHW antenna as built by HB9EAJ. Here are some pitures of building the antenna. MEF-330-1K Multi Band End Fed Half Wave Antenna Transformer. This is an End-Fed Half Wave antenna (EFHW) Transformer for frequencies between 3 and 30 MHz. To use it at any frequency in this 3-30MHz spectrum just add half wave long wire for the frequency of your interest. Benefit of the EFHW antenna is that it will be resonant on harmonic. Multiband End-fed Half-wave EFHW Antenna - Amazing Amateur Radio trend vu2nsb.com. This is a common trait shared by other multi-band wire antennas like the G5RV, Windom, Off-Center Fed Dipole (OCFD), Doublet (Double Zepp), T2FD/T3FD antennas, etc. At the higher frequency bands due to multiple half-wave resonances along the wire length, the.
It's half the size of a dipole and allows for an optimal installation due to it's convenient configuration. Perfect for a typical home and garden arrangement. The multi-band version of an inverted L is smaller than the mono band version, the use of traps reduces the overall length of the antenna due to their inductance. Building and Understanding Your Multiband End-Fed Half-Wave Antenna By Daniel Marks, KW4TI Fiddling with a complicated antenna assembly process when you’re on the road is always a pain. Rather than erecting some multiple section beast of a mast to reach the into sky, wouldn’t it be better just to. 4mm aluminium mounting plate with 48mm clamp (galvanized). 22-23m long (approx) depending on the 80m tuned frequency. Resonant on 80, 40m, 20m, 15m and 10m bands, fully tunable on 80m, an atu will be needed to cover 80m, will be tuned to a spot frequency of your choice. Full half wave on 40m band. So239 socket.
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Designed to be used on 80 through 10 meters, the EFHW antenna wire is approximately one half-wavelength long on 80 meters. A 49:1 impedance transformer converts the high feed point impedance of the wire at its end to a value closer to 50 , more suitable for use with coaxial feed lines. Figure 1 - EFHW Transformer Unit and Antenna Wire. This is the local South African version of the popular EFHW multiband HF antenna.-> This version (Q40X High Power) has two of the extra large FT240’s stacked and wound with 2000 volt insulated wires. Perfect for 40m – 10m at 100 watts, we can also give you an 80m extension to cover most of the popular amateur bands with perfect results. It is called the EFHW-8010. It is simply a half wave end-fed on 80m which will resonate on all multiples of that frequency, loaded with a small inductance near the feed end. This inductance has the effect of bring the resonances a bit lower, particularly on the higher bands and thus improving the match. The commercially available version of.
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The Antenna Tuner will load an End Fed Long Wire effectively, especially if it is cut to aprox. an Odd Quarter Wave-Length of your target band... 186 ft / 16.5 ft and 186 ft / 33 ft... The entire antenna is #12 stranded insulated copper. The Antenna Tuner is a 1977 HeathKit HFT-9, a small QRP size tuner of the Cap-Coil-Cap double"L" design. Multiband End-Fed Half-Wave EFHW Antenna. The End Fed Half Wave antenna or the popularly known EFHW antenna has been around almost ever since the inception of HF radio. Nevertheless, the EFHW antenna had in the past, been rather sparingly used by amateur radio operators due to various reasons. Although it is simple to build and is a multiband. SWR on the low bands dropped and the model showed that the electrical efficiency increase to about 80% rather than 40 % on the 160m band. Efficiency is >95% on 80m and even better on 40m with the new ferrite according to the model. The bands needed another alignment adjustment with the big ferrite installed.
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If you have antenna restrictions, neighbors that tend to complain about antennas, simply want to operate without drawing attentionor you want a lightweight multi-band antenna to use in portable or emergency situations, the CHV-5X is a great choice. Max power: 40/20M 150W SSB 15/10/6M 220W SSB. Horizontal length: 13 ft approx. Weight: 5 lbs. Toggle navigation. Find or Create a Group; Help; Log In; Sign Up; Help; Log In; Home Messages Hashtags Subgroups. Trapped five band EFHW SOTA antenna. Having recently built a MTR2 3-band CW transceiver, I was keen to make band switching on a mountain top as simple as possible. I have been using a 40m End-Fed Half Wave (EFHW) antenna very successfully for the last few months and I wanted to extend the design to multi-band whilst avoiding the need to take a.
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