Any "realistic" end fed wire antenna has a counterpoise which may merely be the ground or actual wire conductors on the ground or some variation. Moonraker MWA-HF MKII Long Wire Antenna With Balun. The random wire is not without it's draw backs. … You can test the End Fed antenna impedance transformer by using a resistance of about 2500 Ohm (for example 2K7) on the ground of the coax connector and antenna connection. This item LWHF-80 80-6m Multiband End Fed Long Wire Antenna. 30 Watts QRP, 40-10 Meters, 66 feet. £28.10 (£23.42/Unit) ... LWHF 40 40-6m Multiband Long Wire Ham Antenna Aerial universal End Fed. The LW HF DX20 End fed long wire antenna. LWHF-40 hf vhf 40 - 6m multi-band ham radio long wire antenna / aerial lw10. But if a power line runs between the trees, forget it. Your feed line is essentially the counterpoise, so a separate one is not needed. addition to the connections to the antenna wire and coax, the instructions suggest MyAntennas End-Fed Half-Wave Antenna for 80 – 10 Meters Bottom Line The EFHW-8010-1K provides an easy-to-deploy antenna that can be operated on all HF bands, except 60 meters, with a low enough SWR to be used without an antenna tuner on most bands. LW HF DX20 End Fed Non Resonant Long Wire Antenna 80m - 6m With an ATU. One antenna that I have always used with good results was an end fed random wire. The other end connects to the random-wire connector on a suitable antenna tuner. A 133ft long 80m version will do 80m through 10m plus WARC bands depending on … In excellent working condition. This is a great end fed antenna complete with a 9:1 Unun . The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arangment. Whether you`re QRP backpacking, vacationing, running a emcomm station, or need an antenna neighbors will never see, MFJs got an EFHW for you: MFJ-1982LP, $59.95. Some books say that you don’t use the counterpoise at all on 10m. 11. I have read a lot of post on the internet regarding the great performance off a End Fed Long Wire Antenna of with a 1:50 / 1:64 matching network. SKU: 11-494 Category: Manufacturer: Moonraker . EFHW-8010-1K ™ Multi-Band End Fed Half Wave Antenna . In this way, the SWR meter should show a standing wave ratio of approximately 1:1.5 or lower. A random wire is just any old length of wire that runs from a support to the back of a tuner and fed to an HF transceiver. You may have a pair of 70-foot trees perfectly positioned to sup- port a wire beam aimed at your favorite DX area. Only 1 left. Quantity: +-Add to Cart. 1 Pc For Balun 1:49 - 49:1 For 5-35MHZ End Fed Half-Wave Antenna 100W PEP HAM. A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long … The following data are for the far field radiation patterns and 3D color views of a sloping End Fed Half Wave antenna with the feed point near ground and curving upward to 40 feet at the far end. £44.95. So do all antennas, but not at the design frequency - there, at the design frequency, the terminal impedance is quite predictable. End Fed 80 - 10 meters HF Multi Band Antenna 1.5 kW 9:1 unun with Kevlar wires. Below is the ideal setup for an end-fed half wavelength antenna that I have determined through experiments and antenna modeling (fig. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. Look into a resonant end fed half wave or EFHW, which will operate on its fundamental design frequency and most harmonics. Moonraker MU-9-9:1 Unun. The direction of radiation is the Blue trace on the polar graphs. W3EDP end fed antenna . This post details my construction of the end-fed half-wave autotransformer and antenna for the 10m, 20m and 40m bands. install an antenna where it can contact a public utility wire. LWHF-40 40-6m Multiband End Fed Wire Antenna. W3EDP Antenna Multiband HF Antenna 80-10M. You do need an ATU though. The antenna is very effective, can be erected in a variety of ways, exhibits low noise, doesn’t cause any RFI in the shack (use a choke balun in addition), places the feedpoint very near to your transceiver and it’s pretty easy to build. Popular. Long Wire and Dipole Antenans for ham radio category is a curation of 179 web resources on , NorCal Doublet Antenna, High Performance Wire Antennas, Random Wire Antenna Lengths. (That dipole may be cut to length on a specific frequency or it may be "however long you can make it", but it's still a dipole, not an end-fed wire.) Below is one example of how to build an 80 metre band long wire antenna for … This antenna wire is fed via a section of parallel-wire transmission line with 1/4 the length of the antenna wire (i.e., 67 / 4 ≈ 17 ft). Mar 4, 2019 - The Experiment: In this experiment were going to explore the use of a 1:64 Matching Auto Transformer on the End Fed Long Wire Antenna. Resources listed under Wire Antennas category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. Free P&P. - End-Fed antennas have wild impedance swings. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m Steve Nichols G0KYA A shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1.3:1) on 80m and 40m, and below 3:1 on 20, 15 and 10m. Add to Basket Whether you`re QRPbackpack, vacationing, emcomm station, or an antenna neighbors will never see, MFJs got an EFHW for you: MFJ-1982LP, $59.95. 30 Watts QRP, 80-10 Meters, 132 feet. One end goes straight into the rig, often with no feedline, and the other end in the air attached to something as high as you can find. MFJ-1984LP, $49.95. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. LWHF-80 80-6m Multiband End Fed Long Wire Antenna. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. This makes the end-fed antenna perfect as a multi-band antenna. I've used dipoles and verticals, but the random wire has always done in a pinch. Other antennas like a simple end fed wire often called a long wire antenna would need a good earth connection for the antenna to operate correctly. End-fed horizontal wire, an EFHW, offers the perfect solution for a wide range of ham activities. SIGMA EUROCOM SE-HF-X80 VERTICAL RADIAL FREE ANTENNA 80 TO 6 METRES. Be heard on the hf bands with an M1ECC Antenna. You'll earn 37 Watts for this item. If it isn't end-fed, then it's usually near-center fed and becomes a dipole antenna instead. The W3EDP antenna is particularly useful when the station is in a room above ground. It is important to use a counterpoise. The best way to determine R,X of the feed point (assuming that is what you want) is to compute them using NEC2. Just look at the following example: 20 meter wire is a half wavelength for the 40 meter band, two half wavelengths for the 20 meter band, four half wavelengths for the 10 meter band and 3 half wavelengths for the 15 meter band. 30 Watts QRP, 80-10 Meters, 132 feet. It is designed as a highly portable wire antenna, easily set up as an inverted V, horizontal, sloper, or in the case of higher frequencies, a vertical radiator. Figure 5 – Ideal End Fed Half Wave Length Antenna The exact impedance of an end fed half wave length antenna has been debated but if you design a coupler to match close to the impedance range in figure 3 a good match can be obtained. An 84 ft long end-fed antenna wire, with a "counterpoise" wire of 1/5 the length of that antenna wire (i.e., 84 / 5 ≈ 17 ft). HF Broadband Long Wire End Fed Antenna The HFLW-230 Long Wire Broad Band Antenna offer optimum performance, fully automatic, low VSWR operation over the HF band 2-30 MHz and suitable for receiving, transmitting or HF spectrum monitoring or surveillance with polarization diversity. A random wire is exactly that—a piece of wire that’s as long as you can possibly make it. It consists of an 85ft wire fed against a 17ft counterpoise (attached to the earth point on the ATU). End fed wire antenna - Icom AH-4 tuner. This is an End Fed Half Wave Long Wire wire antenna that will cover all bands from 80 to 10 met.. This means that the antenna will always have a feedpoint impedence appreciably higher than 50 ohms and will not require much of a ground system to perform adequately. Sign up for price alert. Others say that you can use a 6.5ft counterpoise on 20m. One end of the wire attaches to a tree, pole or other support, preferably at a high point. £44.99. To make the best use of an End-Fed antenna, it should be fed with a transformer. But performance is down about 8-12db on a dipole on 80m. One such antenna is the W3EDP end fed. Your radio expects a 50-ohm impedance, but the impedance of an end-fed wire is much higher, on the order of thousands of ohms. WSPR results on 40M When the solar flux index was only 60. of NOT hanging a heavy coaxial feeder from a long span of thin antenna wire, has rekindled interest in end-fed half-wave antennas. So in… It is for these reasons that roughly 40 metres is a good length for an end-fed wire antenna for the 3.5 to 28 MHz HF bands. $\begingroup$ @Phil_12d3 Usually when one talks about random-wire antennas, one talks about end-fed wire antennas. OR. Also supports End fed Sloper, Inverted L or Vertical Configurations. For the past couple of weeks, I’ve been playing with end-fed wire antennas. The 25m long antenna described here will get you on air without an ATU on 80m, 40m, 20m, 15m & 10m. It has been purposely reduced in length compared to a full sized 80m dipole by the insertion of a 70uH loading coil. You apply a little RF and adjust the antenna tuner to achieve the lowest SWR. End-fed horizontal wire, an EFHW, offers the perfect solution for a wide range of ham activities. If you couldn’t get the SWR down to 1:1, try connecting the antenna tuner/radio to the other BNC connector and repeat the previous step. 5). This is an End Fed Long Wire wire antenna that will cover all bands from 80 to10 meters, including t.. We continue our antenna offerings with this single band, 80m-10m end fed half wave wire antenna. End Fed 80 - 10 meters HF Multi Band EFHW 100 watts 49:1 transformer. For example, a 40m version at about 64ft long also operates fine on 20, 15 and 10m. 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