Different sources use different expressions for the threshold of when an antenna becomes a long-wire antenna. It has a frequency range of 3. 7 WL at 7 MHz which is less. I specifically wanted stranded wire. First, setup your end fed half wave tuner (ex. 15 metres, or thereabouts, long. The antenna can be fed as a random wire on other bands. 45' x 30" UHF Connector. LOW SWR is, and make the wire becoming a bit shorter until the LOW SWR is where you want it (for 140-43) is approximately 14:15 a 14. The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arangment. The longer the total wire the better. Solid Core Wire (two colors, 24-gauge recommended). 64 wave length elements fed in phase. I've previously covered building a multi-band linked dipole Inverted V antenna on here. This portion becomes an inverted "L" ungrounded quarter wave vertical, 39 meters in length, made up of #14 stranded (7x22) copper-clad antenna wire. · 67 foot insulated antenna wire · 34 foot counterpoise · Three antenna insulators · Copy of End-Fed Half-Wave Antenna article from 72 newsletter. L1 = 30 uH, 35 turns of 2. of NOT hanging a heavy coaxial feeder from a long span of thin antenna wire, has rekindled interest in end-fed half-wave antennas. It is about as basic as it gets and it can work quite well on any HF band. You should probably use ring terminal connectors of approximately 6mm to terminate and connect each leg of a dipole at the centre point, but soldered/tinned loops in the end of the wires will do. DX Engineering is your #1 source for wire antennas. 2 metres as the length is non-resonant for radio amateur HF bands 80, 40, 20 and 17m. The first thing I did was buy some 24 guage black wire, specifically this 100 foot spool. End Fed antenna applications. Also, an antenna tuner is required. This antenna works quite well no issues. The end fed feature adds convenience, but does present another issue. Com W0QH 2018-12-26T15:58:23-06:00. However, I'm experimenting with SDR quite a bit and would really like to bu. mfj mfj-1982hp end fed horizontal wire antenna, 1/2 wave, 80-10m, 800w End-Fed Horizontal Wires (EFHW) cover multiple bands with-out traps, stubs, or resonators End-fed radiators have the unique quality of resonating on the 1/2-wave fundamental frequency plus odd/even harmonics above!. do not exaggerate with the length of the wires: once they reached their optimum, the longer they grow, the lower is the radiation efficiency. 950MHz with an SWR of 1. You can see a picture of the antenna in use on my boat. 30 Watts QRP, 80-10 Meters. 300 watts New style resonant end fed antenna requires no counterpoise. 5MHz) therefore also resonant on second, third, and fourth harmonics, etc. I purchased my 'MFJ-1984MP end fed 1/2 Wave 300W 40M-10M Wire Antenna' from a local ham radio outlet store. The other side of the dipole is a quarter wave "floating" counterpoise for the inverted "L" vertical portion. No long counterpoise, radials or feedline required. Complete the form below and we will notify you when this product is back in stock!. 2MHz, ground mounted) SWR – Actual bandwidth on the 50Ω side of the coupler will be much narrower, due to the tuned circuit we are using. For a number of years I just used a circuit that I threw together with large components that I had in my junk box. There is no counterpoise needed per the instructions for the antenna. The problem with an end fed half wave antenna is that the antenna presents a high impedance, creating a significant miss match with the usual transceiver. We are feeding a half wave wire antenna (efhw) at the end due a low loss matching network. With this in mind, I purchased 9:1 UN UN from Balun Designs and ran another end-fed this time with a wire length of 52 1⁄2 feet, again from the palm tree but to a different corner of the house, then a 100 feet of RG-8X from the UN UN to. I brought out this coupler and used it with an end fed half wave vertical antenna for 20m. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. As you all probably know,I use this comercial antenna with a lot of good rapports with my Bitx projects. Others say that you can use a 6. Beginning Thursday, September 12th, customers can purchase these antennas directly at their website at Vibroplex. Shortwave End Fed Wire Antenna w/ Balun. Windom - Similar to the OCFD. Post navigation. Since the end fed wire is in the air it still can benefit from an RF ground "plane" underneath the antenna. Counter to tuning a length of wire like you would with a dipole, with a random wire you don’t. End Fed 80 - 6 meters HF Multi Band Antenna 600 watts unun continuious. Results depend on the height of the wire above ground. An End Fed Halfwave Antenna for Portable Ops I’m a very casual operator, and an even more casual portable operator. 2 Ft) N Male to SMA Male RG58 Coaxial 50 Ohm For CB Amateur Two-Way Radio 3G 4G LTE Ham ADS-B GPS Moonraker MU-9-9:1 Unun. for later and start with a wire antenna. SENTINEL BARRETT 160-6 METER HEXBEAM. An 84 ft long end-fed antenna wire, with a "counterpoise" wire of 1/5 the length of that antenna wire (i. If fed at the end (a. Step#4 --- Attach the end of the antenna wire with the insulator to a high support. So all 44m or wire is in one continuous piece. However it is limited to use on a single band. Model 4132 - 4:1 Unun for Multiband Verticals and Random Wires, 2kW. 38 – Off-center-fed Full-wave Doublet Antenna. Tuning end fed antennas Hi, I have been experimenting with end fed antennas, but for me they always need quite a high capacitor to tune them (150+pF) A friend of mine also is working with them, but he seems to need much lower capacitors (10-20pF) and uses beehive capacitors, he gave me one, but it has a too small capacitance for my antennas. Specially made for the portable user comes complete fixed with winder to unun to store away with ease while on the move. SWE-100 HF Broadband Antenna Single Wire End Fed Dipole 3. I set it up today as a horizontal at about 12 feet above the ground in my back yard. Now, in no particular order of preference, here are N4KC's Top Five Get-on-the-Air-Quickly Antennas: #1 - The half-wave wire dipole. The SWR was adjusted using the tapping point on the coil near the feeder. Portable Multi-band/ Half-wave 49:1 matching transformer, ready built with all fittings, just add the antenna wire. Shop our selection of Alpha Delta wire antennas, including multi-band sloper antennas for limited-space applications and SWL antennas for superior performance through 30 MHz. 1982hp, end fed horizontal wire ant. 000 mhz to 30. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Paypal Only. Most END FED antennas on the market require a tuner, this one does not require one to operate. - End-Fed antennas have wild impedance swings. 2 MHz would have a total length of 65 feet. FULL HF Coverage, no tuner needed on most frequencies. The windings for the 15m coupler are secondary 25 turns of 16 SWG enammeled copper wire with 3 turns of plastic covered wire over the earthy end. 5 mm copper wire with black plastic jacket. For most hams, an end-fed antenna is and "end-fed, half-wave," or EFHW, antenna. The size of the required coil increases with height. 30 Watts QRP, 80-10 Meters, 132 feet. This is showing the feed point SWR at 3200Ω. In the mean time,I changed my 3-bands wire,for a 5-bands wire. With this version of the antenna, interaction between elements and top resonance have been turned to our advantage allowing for excellent multi-band working, while maintaining a useful radiation pattern and efficiency on almost all Amateur Radio bands. One commonly repeated myth or "theory" is that half-wave antennas, being resonant, do not require a counterpoise , or that some magical length of antenna will prevent RF in the shack. Results depend on the height of the wire above ground. End-fed horizontal wire, an EFHW, offers the perfect solution for a wide range of ham activities. Shortwave End Fed Wire Antenna w/ Balun. An Inverted V Fan dipole antenna for 20m an 40m has been used as reference to compare different versions of the impedance transformer. More about that in a moment. coupling issues, it’s rarely implemented on end fed wire antennas. Wire Antenna Design Lengths. 45e-6 'Coil inductance (4. This unit built fine and works when you understand it's limitations. Here are instructions for making a multiband end-fed half-wavelength antenna that works on 17, 20, 30, and 40-meter bands. It is designed to match the high impedance of a non-resonant end fed antenna into a range where most antenna tuners and some internal tuners can produce good performance. Specially made for the portable user comes complete fixed with winder to unun to store away with ease while on the move. UV resistant ABS plastic housing encloses an efficient LC matching network allowing the antenna to be fed with common 50 ohm coaxial cable. This is an End Fed Long Wire wire antenna that will cover all bands from 80 to10 meters, including the WARC Bands, as well as 60 meters and MARS frequencies. Where the antenna wire passes close by several trees, it is held away from the tree trunk by the use of a nail-on electric fence insulator. This project is really simple and most of it was made using stuff I found in my junk drawer. The Sleeve dipole has traditionally been used by VHF antenna designers by sliding an external metal sleeve over the coax and connecting the sleeve to the braid of the coax so that the antenna appears to be centre-fed with an outboard “sleeve”. Supplied end insulators make suspension easy. Beginning Thursday, September 12th, customers can purchase these antennas directly at their website at Vibroplex. Amateur radio websites and YouTube channels are full of chatter about random-length wire antennas fed with a 9:1 impedance dropping transformer (aka 'unun'). 2 Ft) N Male to SMA Male RG58 Coaxial 50 Ohm For CB Amateur Two-Way Radio 3G 4G LTE Ham ADS-B GPS Moonraker MU-9-9:1 Unun. When fed off-center at an appropriate location (typically the 1/3 point) and fed with a 4:1 balun, the dipole becomes a solid multi-band. Using the EFHW for 20m at GB0CMS 3. Shortwave End Fed Wire Antenna w/ Balun. DX work can be accomplished with a simple end fed wire antenna 50 to 100 feet in length, although longer antennas are better. End fed 7 band wire antenna for 80m, 40, (20m, 17m) 15m, 12m, 10m. 50 Add to basket; 12m 24mhz Mono-band end-fed-antenna with mounting bracket. It is designed to match the high impedance of a non-resonant end fed antenna into a range where most antenna tuners and some internal tuners can produce good performance. This is a 200 Watt PEP step up transformer for end fed full and half wave antennas without radials, designed as a 200 Watt PEP upgrade by PA0EJH for the originaly Par Electronics designed 25 Watt HF endfedz multiband end fed antenna. It works on 80/40/30/20/17/15/12 and 10 meter bands. 40 - Double Extended Zepp Antenna. Windom - Similar to the OCFD. Resources listed under End-Fed Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. To erect the antenna, clip the fishing swivel to the eye of the 20 foot fishing pole. This system, according to Ron, would take care of the problems I encountered with the random wire/1:9 balun/tuner concept. You need black wire ties because they are UV resistant, and they will cost you just a few dollars at a hamfest, flea market or hardware store. I've previously covered building a multi-band linked dipole Inverted V antenna on here. I did perform S11 on both to trim for the 30m band. This is showing the feed point SWR at 3200Ω. End Fed Half Wave Antennas VS Random Length End Fed Antennas Different fibreglass poles for Amateur Ham Radio & EFHW 20Mtr wire antenna. An End Fed Halfwave Antenna for Portable Ops I’m a very casual operator, and an even more casual portable operator. I will soon begin experimenting with End-Fed Half-Wave Antennas (EFHWA) as described by VK3IL. The horizontal section comprising of 57ft of wire will then make up the antenna. Only 30 and 40 meters are fully symetrical Vees, but all wires are a full 1/2-wave for the given band. These antennas can be mounted horizontally, vertically or as a sloper. ,(3,5 - 52 MHz), max. 0 ‘Length from start to coil SY Lcoil=0. I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. The good, the bad. They use some kind of matching network to trasnsform the very high impedance at the end of a half-wave wire to about 50 Ω. 9:1 Baluns are useful between 450 ohm balanced lines for center fed Zepps and G5RV antennas where the impedance at the end of the feedline is 450 ohms (1/2 wavelength feedline), or high impedance feeds for log periodic beams. The G0KYA EFHW – an end-fed half wave monoband HF antenna, plus two multiband versions (New!) A practical, cheap monoband or multiband (new!) vertical antenna that is great for DX and very cheap to build. Mon Apr 15, 2019 by gm_stack. Shortwave End Fed Wire Antenna w/ Balun. First, setup your end fed half wave tuner (ex. Other EFHW antenna designs by VK SOTA activators: Glenn VK3YY; Garry VK2GAZ; Reference site: Steve Yates AA5TB The End Fed Half Wave Antenna. Attach the other end to the center insulator in the same way. Log Periodic Antenna Calculator Long Wire Antenna Long Wire Impedance matching Loop-Yagi's — from PA5RWE Loop Antenna, Magnetic, Portable — from G4FON Low Band Antennas-- from. The popular End-Fed Half-Wave (EFHW) Antenna is an easily portable, high-impedance (2,000-4,000 ohm) wire antenna that resonates on its fundamental frequency and all harmonics above. G0KYA's HF End Fed Half Wave (EFHW) antenna - construction details Introduction The EFHW monoband matching unit (inspired by AA5TB) allows for a half wavelength of wire to be connected, giving a 50 Ohm impedance match to the transmitter (without a ground plane or ATU) at the frequency of operation. The end fed feature adds convenience, but does present another issue. We offer a variety of multi-band and all-band dipoles that provide great receiving performance with low SWR. As a side note, in any set of in-phase fed antennas--whether doublets, Yagis, or whatever--the effective. Windom - Similar to the OCFD. 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. As the impedance will be high at the end of the wire, some form of matching unit is needed and a simple parallel tuned circuit housed in a plastic film container is fine (figure 1). I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. If possible a symmetrical antenna like a center fed dipole, either horizontal or vertical, or a center fed symmetrical random wire using good twin lead or ladder line, will decrease the. The dipole was invented by Heinrich Hertz around 1886. The end fed half wave antenna appears in many professional and amateur radio textbooks and the design of. Technical Specs: Antenna Tuner; not Required. Resources listed under End-Fed Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. This project produces an inexpensive, multiband, end fed HF antenna matchbox that is quick and easy to setup and use. As an experiment I bored a 6" hole down 15 feet to the water table and then inserted a 1/2' copper pipe 5 feet deeper into the mud. The company’s name is meant to emphasise the high quality standards (‘Hy End’) as well as the concept of end-fed half-wave antenna (‘End Fed’). Band conditions were AWFUL, with a major solar flare hitting the ionosphere on April 6. " In the case of an end fed vertical antenna the RF ground "plane" is a number of radial wires stretched out from the base of the antenna. It consists of a 30-ft length of coax between the antenna tuner and the UNUN and a 30-ft single-wire end-fed radiator on the "output". hf antennas. This article will not address that antenna type. Being a half wave, no radials or counterpose wires are needed. The South end of the antenna is attached to its supporting tree in the same manner as the North end. NOTE 1: This original N2CX article was first published in the 72 newsletter back in 1997 or 1998. 66) end support. There are plenty of end fed wire antennas commercially available for around $75, but you can build the core of this antenna for less than $10. A better version of long-wire antennas is the V-Antenna. You could consider the end-fed half wave an "off center fed" dipole that's fed VERY off center, like a Windom. This in turn means that the antenna is fed at the end closest, or even inside the shack. WIRE LENGTH IS APPROXIMATELY 50 FEET! YES, ONLY 50 FEET! END FED "RANDOM WIRE" FOR 80-10 METERS WITH BUILT IN RADIO TUNER BUT MANY BUILT IN RADIO TUNERS WILL TUNE THIS ANTENNA PERFECTLY ON 80-6 METERS!! Made in the USA by a (((TAX PAYING))) HAM for Hams. It is a resonant Half wave on 80m (3. Below is a small list of some of the Magic Numbers that I have collected. The main category is End-Fed Antenna that is about End-Fed Antenna projects and plans. Signal path to maximize RFI rejection in an urban environment. Put together a second story, indoor, end fed using the 9:1 from your workshop. MFJ-1982HP EndFed 1/2 Wave 800W 80M-10M Wire Antenna 132 feet. There are alternatives to a full size half wave dipole. You need black wire ties because they are UV resistant, and they will cost you just a few dollars at a hamfest, flea market or hardware store. 5 mm copper wire with black plastic jacket. The half wave end fed antenna is simply a half wavelength wire fed at the end rather than the center like the half wave dipole. Some books say that you don’t use the counterpoise at all on 10m. I then passed the wire through the end of an insulator, and bent the irrigation tubing round using 3 cable ties to hold in position. 95 Shipping/Packing for USA shipments via Priority Mail. Back to the first page. The idea was to test each antenna in as equivalent band conditions as possible. 30 Watts PEP. This formula takes into consideration the capacitive "end-effect" from insulators which shortens the physical length requirement for the equivalent electrical length. It is a resonant Half wave on 40m (7MHz) therefore also resonant on second, third and fourth harmonics. The feeding point of a multiband End Fed antenna is practically a wide band impedance transformer. The Magic Numbers are lengths that seem to work very well for them. Notice how the feedpoint is not quite as high impedance as the top of the antenna. 45' x 30" UHF Connector. The South end of the antenna is attached to its supporting tree in the same manner as the North end. As described in the accompanying article, the half-wave end-fed antenna can be as effective as the common center fed dipole antenna yet is simpler to put up and much easier to carry along for. The smaller EF-4010 End-fed antenna is ideal for portable or attic installations between 40 and 10 meters, plus it makes for a great all band SDR receiving antenna from 0. The one end of the antenna was at 25-30 feet at the fed end, 20 feet on the far end. It incorporates a 9:1 UNUN at the feedpoint enabling it to be fed directly with 50 Ohm coaxial cable. However, I'm experimenting with SDR quite a bit and would really like to bu. 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. End-fed horizontal wire, an EFHW, offers the perfect solution for a wide range of ham activities. The far end of the antenna is about 6 feet above the ground. Most END FED antennas on the market require a tuner, this one does not require one to operate. In my last post I talked about using a high impedance end fed matching transformer connected directly to an aluminum chalk line reel capacitively coupling to the wire that is used to create a variety of field deployable antenna shapes without a tuner. Recently, it had a better test - down on a rented beach house in a more remote area. One of my favorite single band portable antennas is the end fed half wave antenna. After all, a half wave dipole is 250 feet long. Complete the form below and we will notify you when this product is back in stock!. The wire is more expensive than others but resists kinking and has a very rugged PVC coating. Current along the half wave. Resources listed under End-Fed Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. When used as a sloper, the favoured direction can be altered by moving the sloping wire at the lower end. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. If it isn't end-fed, then it's usually near-center fed and becomes a dipole antenna instead. I use a 29 foot wire with my PackTenna 9:1 balun for 40m-10m and then add a 28 foot length for better coverage on 80m when needed. Getting a Big DX Signal on 160-10 m from One Small, Low Antenna Chuck Counselman, W1HIS I live on a small lot in a dense, inner suburb of Boston and Cambridge. The Par Electronics EF-SWL is an end-fed short wave antenna optimally designed for 1-30 MHz reception. This antenna works in high frequency range. 46 - Piggyback Antenna for 10m. , 84 / 5 ≈ 17 ft). This all-aluminum gutter is fed with coax with an unterminated shield (at this end, shield connected to radio ground at the other) to reduce nearby computer hash from inside the house. The good, the bad. both use a guinella type balun but wound 20t on each of two ferrite cores that are then taped side by side. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. Add a few inches for loops to connect to both center and end insulators for mechanical support. Using inner conductor of a coax feedline as an antenna. (13-AWG) wire wound on an Amidon T-400-3 Toroid. Shortwave End Fed Wire Antenna w/ Balun. 300 watts New style resonant end fed antenna requires no counterpoise. This antenna works in high frequency range. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. An end fed antenna consists of a wire fed on its end, the length of that wire is not resonant with any frequency or frequencies you will be using it on. The versatile end fed wire A piece of wire of almost any length can be used as an antenna on the HF bands. I bought a fiberglass GFK pole 11,5 meters long (collapsed 1,5m) for attaching an end fed wire. An exact multiple of a half wave length from the reflection point (end of the wire) to the radio, means the SWR will be so high as to be almost impossible to tune. END FED 6-40 Meter Multiband HF Antenna Introduction This project produces an inexpensive, multiband, end fed HF antenna matchbox that is quick and easy to setup and use. In either case, the antenna. 3:1) on 80m and 40m, and below 3:1 on 20, 15 and 10m. The most simple is a 75 meter dipole fed with open wire or ladder line, tuned up on 160 meters, as shown in Figure 1. This portion becomes an inverted "L" ungrounded quarter wave vertical, 39 meters in length, made up of #14 stranded (7x22) copper-clad antenna wire. 136 - Bi-Loop Antenna for 20m. 7m) central support and a 12ft (3. This antenna wire is fed via a section of parallel-wire transmission line with 1/4 the length of the antenna wire (i. How to build a mono band 80 meter 1/2 wave wire an Hy End Fed Antenna;. 42 - Vee-Sloper Antenna. 950MHz with an SWR of 1. A better version of long-wire antennas is the V-Antenna. The wire is more expensive than others but resists kinking and has a very rugged PVC coating. of twin-lead wire with one of its wires soldered to 33. LOW SWR is, and make the wire becoming a bit shorter until the LOW SWR is where you want it (for 140-43) is approximately 14:15 a 14. The end fed halfwave connects mechanicaly to the UNUN as follow: Phising pole. The other 6 feet will be used to support the antenna at the ground ends, (gray closest to ground), and for jumpers. A bit of background. Counter to tuning a length of wire like you would with a dipole, with a random wire you don't. This is showing the feed point SWR at 3200Ω. All SAL Electronics' HF wire antennas are designed with a low noise direct DC ground transformer. It lies on the ground and is insulated from it (#14 insulated multi strand wire). Added a 17 foot counterpoise that heads off the 9:1 in the opposite direction as the antenna wire. The 7-Band antennas need at least 120 feet of ground space end-to-end. 300 watts New style resonant end fed antenna requires no counterpoise. The "extension" being an extra 1/8 wavelength added to the Zepp (on each side). L1 = 30 uH, 35 turns of 2. One end of the wire attaches to a tree, pole or other support, preferably at a high point. Lengths of a half-wave or multiple must be avoided. You apply a little RF and adjust the antenna tuner to achieve the lowest SWR. , 67 / 4 ≈ 17 ft). 2MHz, ground mounted) SWR – Actual bandwidth on the 50Ω side of the coupler will be much narrower, due to the tuned circuit we are using. End-Fed 2x14 turns UnUn transformer (1:49) End-Fed 3x24 turns UnUn transformer (1:64). MFJ-1984HP EndFed 1/2 Wave 800W 40M-10M Wire Antenna 66 feet. Being end fed the 2012/912 broadband portable antenna is quick and simple to install, requiring a mounting point such as a small pole or tree, the other end being attached to either a vehicle bull bar or the housing of a portable transceiver. The Magic Numbers are lengths that seem to work very well for them. More about that in a moment. End fed / long wire antenna Multiple wavelength long wire End fed half wave antenna W3EDP antenna The end fed half wave antenna is an attractive option for many radio hams as it is able to provide multiband operation without the use of traps or stubs whilst occupying a minimum amount of space and not presenting a very ugly visual impact. End Fed Half Wave Tuner Kit The original SOTA tuner developed and kitted by KI6J This kit was designed for use by travelers, packers, and other ultra/P amateur operators needing a lightweight, easy to deploy antenna system. An End Fed Halfwave Antenna for Portable Ops I’m a very casual operator, and an even more casual portable operator. 8 cm) apart. But for everyone else, YMMV. The idea was to test each antenna in as equivalent band conditions as possible. I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. Building an End Fed Random Wire Antenna. endfed antenna This end fed type of antenna was marketted in the UK and is a useful system for the portable set-up. But be warned - end-fed antennas can be noisier and also cause more EMC/interference problems. EFwire antennas are also great portable multiband antennas that can easily be deployed using trees, glass fibre masts, flag poles. This material is very strong yet can easily be coiled like a rope for portable work. Supplied end insulators make suspension easy. (There is a variant by OH5RM for low angle on 10MHz - see pdf doc). One end of the wire attaches to a tree, pole or other support, preferably at a high point. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. One commonly repeated myth or "theory" is that half-wave antennas, being resonant, do not require a counterpoise , or that some magical length of antenna will prevent RF in the shack. - End-Fed antennas have wild impedance swings. If only 80m and 40m were considered, the idea is to make an antenna half way between 20m (¼ of 80m) and 10m (¼ of 40) ie. item 7 LWHF 160 DX HF 160 -6m Multiband Long Wire Ham Antenna Aerial universal End Fed 6 - LWHF 160 DX HF 160 -6m Multiband Long Wire Ham Antenna Aerial universal End Fed £54. EndFed 1/2 Wave 800W 80M-10M Wire Antenna SKU: ZMF-1982HP. Below is one example of how to build an 80 metre band long wire antenna for a house with a smaller garden. Other EFHW antenna designs by VK SOTA activators: Glenn VK3YY; Garry VK2GAZ; Reference site: Steve Yates AA5TB The End Fed Half Wave Antenna. The simplest field antenna involves tossing a weighted line over the nearest high tree, pulling the wire up as high as it will go, and feeding it from the end. The first 6ft (1. A simple tuner will match over something more than an octave (2 x frequency) so. Also, an antenna tuner is required. Materials (pictured) A/B. CM End fed multi-band using a single coil to adjust resonance CM CE SY L1=2. With a good ground system the antenna could also be used a compromise quarter-wave "Marconi" antenna on 3. Rugged weather-resistant 50-Ohm matching network. An 84 ft long end-fed antenna wire, with a "counterpoise" wire of 1/5 the length of that antenna wire (i. This is an End-Fed Half-Wave (EFHW*) antenna for 40/20/15 and 10m bands. End-fed wires resonate on their 1/2-wave fundamental frequency plus all odd and even harmonics above. 135 - Collinear Vertical Antenna 6dB-Gain for 2m, 1. This will place the feed point of the antenna 45 feet in from one end. End insulators are supplied making suspension easy. 0:1 on the 11 meters band it was built for. One leg of this antenna is 45 feet long and the other leg is 90 feet long. PackTennas are light weight, compact, portable HF antenna systems ideal for operating on the trail, at the campsite, on Field Day, SOTA activation, air travel, or HOA restricted locations. 5 mm copper wire with black plastic jacket. 30 Watts QRP, 80-10 Meters, 132 feet. Add to Wish List. Attach the feed line at the center insulator, and solder each connection. When used as a sloper, the favoured direction can be altered by moving the sloping wire at the lower end. The wire and feed line are light enough that it can be mounted with just the two ends supported. 300 watts New style resonant end fed antenna requires no counterpoise. The NI4L end-fed 40-6m dipole antenna is just about perfect for portable operation. ; End-Fed Horizontal Wires (EFHW) cover multiple bands with-out traps. 3:1) on 80m and 40m, and below 3:1 on 20, 15 and 10m. End-fed horizontal wire, an EFHW, offers the perfect solution for a wide range of ham activities. Results depend on the height of the wire above ground. The Elecraft KX-3 tunes it easily on all bands and it competes favorably with a Buddistick. 000 mhz to 30. 03 'Length of coil SY L2=39. Mounted in this fashion, the end fed half wave makes an excellent NVIS (Near Vertical Incedent Skywave) antenna that gives good coverage out to around 300 miles on the low bands 30 thru 80 meters. 129 - 2m Vertical Wire Antennas. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. The versatile end-fed wire. These antennas can be mounted horizontally, vertically or as a sloper. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. In order to get an idea of the right place to start, certain formulas are generally accepted. End fed 1/2 wave matching system end feed, W8JI: End fed antenna lambda/2, IV3ZNK: End fed-Halfe-wave antenna, OE3MZC: End fed half wave antenna EFHWA: End-Fed Monobanda: End Fed Half Wave Antenna Coupler, M0UKD: End-Fed Wire Antenna, IK0RKS: End Fed Wire Antenna for 10,15,20 and 40 meter band, PA1ED: End Feed Half Wave Antenna, IZ0HCC. 160-10 Meter W7FG Open Wire Fed Dipole-240' Top Length Dipole With 150' Feed Line 600Ω Open Wire Ladder Line One Conductor from Balun or Tuner to Far End Insulator. There are plenty of end fed wire antennas commercially available for around $75, but you can build the core of this antenna for less than $10. It would normally be on half wavelength long on the lowast band you wish to use it on. Being a non-resonant length the feed point shouldn't exhibit a very high impedance thus placing the End Fed wire antenna impedance within range of my homebrew T. This is an End-Fed Half-Wave (EFHW*) antenna for 40/20/15 and 10m bands. A “general purpose” end fed half-wave wire antenna can work OK* and is very simple to deploy in the field. Cut your wire in half (each end is now 234/frequency), and insert a center insulator in the middle. 30 Watts QRP, 80-10 Meters. Built into a 1 1/2" PVC Cap. So all 44m or wire is in one continuous piece. Below a small description of an easy to make and cheap multiband wire vertical. Minimum handling and a relatively high efficiency. Also, an antenna tuner is required. See this link for more info. An overview and where it all started 2. There will be a certain amount of radiation. Orientation was roughly north/south. 300 watts New style resonant end fed antenna requires no counterpoise. EndFed 1/2 Wave 800W 80M-10M Wire Antenna SKU: ZMF-1982HP. These are sometimes known as a Magnetic Longwire Balun. Half-Lamda Tee Antenna. Note that any of these lengths are going to be long on 6 meters. Why wire? "Skyhooks" made with wire are relatively inexpensive compared to 40-meter dipole fed with 80-meter energy has a low radiation resistance but very high reactance. Classic end fed long wire consists of 30' of #24 insulated antenna wire with 3. Over this span of time, End-Fed users have come up with a group of Magic Numbers. I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. FULL HF Coverage, no tuner needed on most frequencies. The other end connects to the random-wire connector on a suitable antenna tuner. NOTE --- Hanging the antenna at least 20 ft. A random wire is exactly that—a piece of wire that's as long as you can possibly make it. The "extension" being an extra 1/8 wavelength added to the Zepp (on each side). , 84 / 5 ≈ 17 ft). Beginning Thursday, September 12th, customers can purchase these antennas directly at their website at Vibroplex. 30 Watts PEP. Assembling your antenna, and this where the fun comes into play. Several ways exist to bring the wire's high impedance feedpoint closer to the desired 50 ohms, including use of a 49:1 or 64:1 unun, which eliminates the need. End-fed antennas, or antennas with the single wire feeder brought into the shack, come with a little misconception. With a good ground system the antenna could also be used a compromise quarter-wave "Marconi" antenna on 3. 99 Buy It Now , $7. A random wire antenna usually consists of a long (at least one quarter wavelength) wire with one end connected to the radio and the other in free space, arranged in any way most convenient for the space available. SWE-100 HF Broadband Antenna Single Wire End Fed Dipole 3. Wire Antennas Amateur Wire Antennas : The Vibroplex PAR EndFedz® are a full length half wave dipoles, but with an important difference. The Magic Numbers are lengths that seem to work very well for them. The first thing I did was buy some 24 guage black wire, specifically this 100 foot spool. Half-Lamda Tee Antenna. A bit of background. Many hams don’t have room to install one. PackTennas are light weight, compact, portable HF antenna systems ideal for operating on the trail, at the campsite, on Field Day, SOTA activation, air travel, or HOA restricted locations. 1982hp, end fed horizontal wire ant. End-Fed 2x14 turns UnUn transformer (1:49) End-Fed 3x24 turns UnUn transformer (1:64). 300 watts New style resonant end fed antenna requires no counterpoise. The antenna has like the fan dipole parallel wires for the bands for the bands it has to work on. I messed around with this quite a bit but I couldn't find a good length of antenna wire and feeder which made a significant improvement over the 'normal' sized version. We have designed a range of half wave end fed wire antennas. A Low Antenna: Height less than one-eighth wavelength. 160-10 Meter W7FG Open Wire Fed Dipole-240' Top Length Dipole With 150' Feed Line 600Ω Open Wire Ladder Line One Conductor from Balun or Tuner to Far End Insulator. Our showroom facility is a focal point for the local amateur radio community. By adding a broad-band matching network, the wire’s high impedance feed point is transformed down to 50 ohms across a wide frequency range and, in most cases, you don’t need a tuner to operate. SWE-100 HF Broadband Antenna Single Wire End Fed Dipole 3. Specially made for the portable user comes complete fixed with winder to unun to store away with ease while on the move. This antenna has been a great performer - when and where you can set up the pole, get the angle on the V correct and keep other stuff out of its near field. The OCF80 use the "GU4-HF-5KW-A" Guanella 4 to 1 Current Balun (supplied) which is rated at 5000 watts. The main category is End-Fed Antenna that is about End-Fed Antenna projects and plans. 2MHz, ground mounted) SWR – Actual bandwidth on the 50Ω side of the coupler will be much narrower, due to the tuned circuit we are using. The "Easy To Erect" SWE-100 is an efficient. END FED HALF WAVE ANTENNA; MTC sells Wire antennas from RadioWavz and MFJ. If you look closely, you can see the screw in the tree trunk. No ground plane or counterpoise is needed. This article will initially concentrate on the half wavelength of wire and its use as an effective multiband antenna. Double Bazooka - Broad banded dipole made out of coax. Center fed wire 35 feet above ground –14 MHz 1/2wl 180 degrees 35’ 68 ohms (resonant) 3/8 wl 135 degrees 25. On 20 it is much the same, just more wire on the side opposite the feedpoint. Beginning Thursday, September 12th, customers can purchase these antennas directly at their website at Vibroplex. Easy Storage/transport. It consists of a main board with tuner and SWR indicator, two trap pcb’s and an end wire support. The EF 40-6 contains a trifilar wound, 9:1 UNUN (unbalance to unbalance) toroid matching transformer that will match the high input impedance of an end fed antenna into the range where most antenna tuners can produce good performance. End-fed, half-wave antennas (EFHWs) are a half-wavelength long and are resonant. At the moment I'm really just after receiving, but a nice-to-have would be allowing to use it for transmitting without much modification, in the future. Twin-Led Marconi Antenna. i have worked 70 countrys in six months including a. First, setup your end fed half wave tuner (ex. 000 mhz to 30. Materials (pictured) A/B. LNR is pleased to announce that the PAR EndfedZ line of wire antennas has been acquired by Vibroplex. I set it up today as a horizontal at about 12 feet above the ground in my back yard. Cut your wire in half (each end is now 234/frequency), and insert a center insulator in the middle. 37 - Multi-Band Portable Antenna. However I do like these antennas, they work almost as good as a mono-band dipole would. What is the best type of feedline for a base UHF VHF ground plane antenna with a distance of around 50-75 feet of coax? 2. See the Halfer kit page for additional details. First, setup your end fed half wave tuner (ex. 4 , 9 MHz, 12. Counter to tuning a length of wire like you would with a dipole, with a random wire you don't. The 25m long antenna described here will get you on air without an ATU on 80m, 40m, 20m, 15m & 10m. The problem with an end fed half wave antenna is that the antenna presents a high impedance, creating a significant miss match with the usual transceiver. 00 mhz Made 1. By varying the length of the 450 ohm ladder-line feeding the antenna, we can achieve an SWR of less than 2:1 on all frequencies on all HF bands with the exception of the lowest part of 80m. Anyway, I've used them from time to time but never thought they were as good as a long wire, loop or dipole cut for a specific frequency. 300 watts New style resonant end fed antenna requires no counterpoise. I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. 5 to 108 MHz. Some variants of the common dipole are the end-fed halfwave antennas such as the End-Fed Zepp (originally strung behind Zepplin airships), and the VHF J-Pole which simply uses a transmission line transformer instead of a tuned circuit to match the coax to the high impedance at the end of a dipole. Thanks for sharing, Have been using two different end fed wires 124' and 84' #14 wire for abt 3 weeks now, made the 9:1 ununS with junk box toroids and #16 enameled copper wire. Latin America Probably doesn’t need listening antenna. A so-called random wire antenna is an end fed antenna. The results are fantastic. Design of an end-fed HF antenna I haven't done much with HF over the years, but want to put up an antenna out the back of my place for HF. End-fed antennas, or antennas with the single wire feeder brought into the shack, come with a little misconception. By adding a broad-band matching network, the wire’s high impedance feed point is transformed down to 50 ohms across a wide frequency range and, in most cases, you don’t need a tuner to operate. Wire Antennas. This will serve as my backup antenna for the DXpedition to Saint Pierre. 240 feet is 1. This system, according to Ron, would take care of the problems I encountered with the random wire/1:9 balun/tuner concept. EFwire antennas are also great portable multiband antennas that can easily be deployed using trees, glass fibre masts, flag poles. The problem with a lot of portable antennas and antennas in confined spaces is the low efficiency of those antennas. 00 mhz Made 1. Solid Core Wire (two colors, 24-gauge recommended). ; No long counterpoise, radials or feedline required. For each model the inductance and capacitance values of three alternative impedance matching networks are computed to match to a 50-ohm line. As long as the user has a conjugate match on the transmitter end of the line using an antenna matching network, virtually ALL power is radiated by the antenna. Fed at 34% from the end, it uses a single feed wire and can be resonant on more than one band. A Low Antenna: Height less than one-eighth wavelength. This idea comes from Hans PE1BVQ to buy this pole at Elektrodump (51 euros) I removed the 6 meter vertical and replaced it for this ‘vertical’ the used end fed (my holiday antenna. Ideal balance of strength and flexibility; Low-Gloss finish and small size makes wire disappear into the background. The W1SFR End Fed Antenna is 35′ long and made with 18 ga Davis RF "PolyStealth" antenna wire, or Wireman "silky" 18ga. Other 160-Meter Antennas Some amateurs obtain good perfor- mance with end-fed 1/2-X wire antennas. Build instruction impedance transformer for End Fed antenna's. 46 - Piggyback Antenna for 10m. Some variants of the common dipole are the end-fed halfwave antennas such as the End-Fed Zepp (originally strung behind Zepplin airships), and the VHF J-Pole which simply uses a transmission line transformer instead of a tuned circuit to match the coax to the high impedance at the end of a dipole. The heart of the multiband (you could as well call it "anyband") end-fed is a 1:50 (to 1:60) impedance transformer that feeds half a wave of wire fed at the end (or beginning) where impedance is (very) high (aroun 3k Ohms). HIGH QUALITY - $37. 00 mhz Made 1. 45e-6 'Coil inductance (4. Palomar Engineers employs a dual core matching system that offers wide bandwidth (1-61 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired. 08") Open the wire gauge and diameter calculator in a. These are sometimes known as a Magnetic Longwire Balun. It works on 80/40/30/20/17/15/12 and 10 meter bands. When fed off-center at an appropriate location (typically the 1/3 point) and fed with a 4:1 balun, the dipole becomes a solid multi-band antenna. Off Center Fed Dipole - Feed point is 20-33% from one end. 2 MHz would have a total length of 65 feet. 40 – Double Extended Zepp Antenna. End Fed Half Wave Antennas VS Random Length End Fed. 5 Wave-Length wire on lowest band (130ft on 80m, 67ft on 40m) Fed from one end using a transformer in a box. So do all antennas, but not at the design frequency - there, at the design frequency, the terminal impedance is quite predictable. Discussion in ' Antennas, Feedlines, Towers & Rotors ' started by KG4LLQ, Jul 14, 2018. 129 - 2m Vertical Wire Antennas. An 84 ft long end-fed antenna wire, with a "counterpoise" wire of 1/5 the length of that antenna wire (i. To support an antenna, I have no tower, and only two trees that aren't too close to a house. 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. The Magic Numbers are lengths that seem to work very well for them. End-fed horizontal wire, an EFHW, offers the perfect solution for a wide range of ham activities. End Fed Wire Antenna. The SWR was adjusted using the tapping point on the coil near the feeder. Orientation was roughly north/south. I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. These End fed antennas are unique, as they are resonant on 8 bands and DO NOT require a tuner to operate. Higher almost always. An Inverted V Fan dipole antenna for 20m an 40m has been used as reference to compare different versions of the impedance transformer. How to Construct a Dipole. Check Store Stock. This antenna works in high frequency range. HFedz End Fed 10m-160m HF antenna (200W) Ham Radio Antenna Sold $64. More about that in a moment. Half wave dipole antennas are generally considered the reference point for all antennas in ham radio, especially on HF. To make the best use of an End-Fed antenna, it should be fed with a transformer. high will yield good performance. 80/40 Resonant End Fed (sloper, loaded end at 25 feet, feedpoint at 3 feet) Test Procedure. A bit of background. I decided to look at several configurations to see which might stand out; the "easy" setup with the short wire thrown on the ground, an end fed zep configuration, one with the short wire about 2' above ground and a simple 84' end fed wire (sketches are below). In this weeks video we build a simple long wire antenna. That is an end fed quarter wavelength piece of wire run. End Fed Half Wave (6. Extend the pole and set it up. As long as the user has a conjugate match on the transmitter end of the line using an antenna matching network, virtually ALL power is radiated by the antenna. The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arangment. NOTE 1: This original N2CX article was first published in the 72 newsletter back in 1997 or 1998. Before I added 80 meter, I operated that band with a end-fed wire antenna. 08") Open the wire gauge and diameter calculator in a. Counter to tuning a length of wire like you would with a dipole, with a random wire you don’t. ; Fast Setup and takedown. One manufacturer calls them an "end fed dipole". The wire is also from Sotabeams (yellow hi-viz). 00 mhz Made 1. 45' x 30" UHF Connector. I did perform S11 on both to trim for the 30m band. It would normally be on half wavelength long on the lowast band you wish to use it on. Now, in no particular order of preference, here are N4KC's Top Five Get-on-the-Air-Quickly Antennas: #1 - The half-wave wire dipole. 95 Shipping/Packing for USA shipments via Priority Mail. Notice how the feedpoint is not quite as high impedance as the top of the antenna. But be warned - end-fed antennas can be noisier and also cause more EMC/interference problems. I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. You apply a little RF and adjust the antenna tuner to achieve the lowest SWR. However, I'm experimenting with SDR quite a bit and would really like to bu. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m The 80-10m EFHW This is a shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1. 132 - Double Bobtail Antenna for 20m. EFHW featured in "Stealth. Other EFHW antenna designs by VK SOTA activators: Glenn VK3YY; Garry VK2GAZ; Reference site: Steve Yates AA5TB The End Fed Half Wave Antenna. 03 'Length of coil SY L2=39. 5MHz) therefore also resonant on second, third, and fourth harmonics, etc. I started by pounding a 8 foot ground rod into damp earth at a strategic spot about 5 feet from the base of a tree in my back yard. ; Stainless Hardware, UV resistant materials throughout. Manufacturers of High Quality HF END FED Wire Antennas De trendsetters van de eindgevoede antennes sinds 2006. The popular End-Fed Half-Wave (EFHW) Antenna is an easily portable, high-impedance (2,000-4,000 ohm) wire antenna that resonates on its fundamental frequency and all harmonics above. The feeding point of a multiband End Fed antenna is practically a wide band impedance transformer. G0KYA's HF End Fed Half Wave (EFHW) antenna - construction details Introduction The EFHW monoband matching unit (inspired by AA5TB) allows for a half wavelength of wire to be connected, giving a 50 Ohm impedance match to the transmitter (without a ground plane or ATU) at the frequency of operation. The Half Square antenna is a wire antenna with two vertical radiators fed in phase. End fed / long wire antenna Multiple wavelength long wire End fed half wave antenna W3EDP antenna The end fed half wave antenna is an attractive option for many radio hams as it is able to provide multiband operation without the use of traps or stubs whilst occupying a minimum amount of space and not presenting a very ugly visual impact. 5m) end-fed is insulated for safety. 5 to 108 MHz. The frequency range of operation of V-antenna is around 3 to 30 MHz. L1 = 30 uH, 35 turns of 2. I started by pounding a 8 foot ground rod into damp earth at a strategic spot about 5 feet from the base of a tree in my back yard. Here is a sure fire way to make end fed half wave antennas fed with a 50 ohm coupler work - without long radials, elaborate grounds, chokes, voodoo, etc. My main reason for not putting much effort into portable operation is that when I go out into nature, I want to enjoy my surroundings and not be distracted by radios. A random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a relation to the wavelength of the radio waves used, but is typically chosen more for convenience. This unit built fine and works when you understand it's limitations. However I do like these antennas, they work almost as good as a mono-band dipole would. Capable of handling near legal limit without core saturation. 41 – TCFTFD Dipole Antenna. The coupler mounts directly to the rear of the rig via the BNC plug and the End Fed Half Wave antenna connects directly to the banana jack. A simple tuner will match over something more than an octave (2 x frequency) so. Windom - Similar to the OCFD. Wire lengths for the 4:1 ratio in models 4932 and 4935. 99 Buy It Now , $7. 000 mhz to 30. Very convenient and simple. 30 Watts QRP, 80-10 Meters, 132 feet. End-Fed Antennas, Ground Systems, Tuning & Matching A common arrangement is an inverted-L antenna wire with the transmitter and ATU in a room on the first floor. There are alternatives to a full size half wave dipole. 00 mhz Made 1. com in a single category. In this weeks video we build a simple long wire antenna. In the search for the "Wonder Antenna" that is small, portable and easy to setup, I've decided to build an Endfed antenna using a 9:1 match. "IOW, what length must an end fed wire be to exhibit the characteristics of a "longwire" antenna? When operating at 7 MHz, is a 240 foot long endfed wire considered to be a longwire antenna?" Vees, rhombics, and Beverage antennas are long wires according to Kraus. But be warned - end-fed antennas can be noisier and also cause more EMC/interference problems. You may use 12- or 14-AWG instead. 43 – Rhombic Inverted-Vee Antenna. End-fed wire antennas. Running 500+ watts through a tuner into a coax fed system with an SWR of 15 will most likely arc in the connectors or turn your tuner, amplifier, or balun into a toaster. When fed off-center at an appropriate location (typically the 1/3 point) and fed with a 4:1 balun, the dipole becomes a solid multi-band. We offer a variety of multi-band and all-band dipoles that provide great receiving performance with low SWR. LNR is pleased to announce that the PAR EndfedZ line of wire antennas has been acquired by Vibroplex. End Fed Half Wave A dipole antenna that’s fed at one end instead of the middle Very high impedance, 1800 - 5000 Ω. It consists of two pieces of conductive wire stretched end-to-end, and joined together in the middle with a short insulator. A Short Antenna: In general, an antenna with each leg shorter than one-eighth wavelength, but in some cases shorter than one-quarter wavelength. 6 m with a 5. Huntsville Store: Skip to the end of the images gallery. The feed point is conveniently located at the end of the antenna and attachment point making the EFwire antennas light and discrete. Below is one example of how to build an 80 metre band long wire antenna for a house with a smaller garden. Wire Antennas for Ham Radio. The transformer usually used with an end fed wire is a 9:1 transformer. Rugged weather-resistant 50-Ohm matching network. Latin America Probably doesn’t need listening antenna. I brought out this coupler and used it with an end fed half wave vertical antenna for 20m. The wire is more expensive than others but resists kinking and has a very rugged PVC coating. End Fed Antennas with no Radials Due to the lack of open space in my yard it is almost impossible to install radials for vertical or end fed wire antennas. The versatile end-fed wire. The EMCOMM III Portable antenna End-Fed Inverted “V” configuration, see figure (1), is a medium range HF antenna. An optimum installation would be where the antenna is deployed as a sloper with the high (feed point) end at 30 feet or higher and the low end at 10 feet or higher. MFJ -1984MP, end fed horizontal weir antenna MFJ -1984MP fed, wire with 75' 100% Dacron polyester support rope note: this listing is for one 300 watts pep meters 66' length 75', included. However, I'm experimenting with SDR quite a bit and would really like to bu. Building an End Fed Random Wire Antenna. In the mean time,I changed my 3-bands wire,for a 5-bands wire. It has a frequency range of 3. FULL HF Coverage, no tuner needed on most frequencies. The End Fed antenna is very popular especially for field work. Orientation was roughly north/south. In this weeks video we build a simple long wire antenna. Half wave dipole antennas are generally considered the reference point for all antennas in ham radio, especially on HF. The MFJ end-fed Zepp is a completely assembled single band half-wave antenna. Steve Yates - AA5TB HOME. Stretch out the two 22 foot wires and tie off the strings to suitable supports. Antenna information. The End-fed Half-wave (EFHW) The first relies on the fact that from the end of the antenna a length of wire on or two half-waves long looks very similar. That is why balanced wire tuner outputs or end fed wire tuners have long ceramic insulators on the output terminals and don't use coax. It’s easy to design and easy to install. The 9:1 UNUN also removes static noise and provides a DC path to earth.
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