Counterpoise Length For End Fed Antenna

Multiband half wave end-fed HWEF (2012) Following the original article about the HWEF that I wrote back in 2012. Antenna tuners are generally located at the trans-mitter output, at the radio end of the coaxial feed line. The antenna gain, or power gain of an antenna is defined as the ratio of the intensity (power per unit surface area) radiated by the antenna in the direction of its maximum output, at an arbitrary distance, divided by the intensity radiated at the same distance by a hypothetical isotropic antenna which radiates equal power in all directions. The end fed antenna functions well in several configurations including horizontal, sloper, and vertical configurations. Such systems are sometimes described as "groundplanes" or "elevated radials", although by definition they are also counterpoises. If possible, run the counterpoise away from or perpendicular to the antenna wire. In designing a counterpoise for a medium-wave radio station, for example, radio-waves are a maximum of 566 metres (1,857 ft) long. Last weekend when I was camping at Nylstroom I made contact with Gert ZS6GFS in the Kruger National Park. Right Angle Marconi Antenna 17 26. New box design with side tabs for easy hanging, relocated antenna connector, improved ez-tune matchbox. In this article I will try to share my experience with the end fed long wire antenna. The principle of operation is this: At the feedline end of the. (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. The end fed feature adds convenience, but does present another issue. It is a resonant Half wave on 80m (3. 2/MHz, m = 15/MHz) or connect the side opposite the antenna to the system ground (return). At the end, the antenna wire is terminated at about 15 feet above the level of the back yard. N4KGL End Fed Antenna Configuration for Rapid Deployment The combination of an end fed wire and a 9 to 1 unun is very popular. Antenna portion is made from 30' of premium 18 awg stranded copper wire. But in the case of the end-fed your equipment becomes the other side of the antenna. Not that some antennas don't need a counterpoise, for example a 5/8th wave antenna or an end fed zepp which uses no or a very short counterpoise. Ideal for camping, weekends away, holidays etc. A dipole can be fed anywhere along its length. The end-fed antenna has traditionally been designed to resonate on one lower band in the HF spectrum, say a quarter wavelength on 80 meters where the current feed will meet an impedance of around 50 ohms. Antenna tuner is needed on 20 and 17m and to extent the bandwidth on 10m. 50 - Collinear Trap Antenna. Ideal: Sloper configuration with one elevated counterpoise is good but several different length counterpoises maybe better. MFJ-1984MP END FED, HORIZONTAL WIRE ANTENNA : Note: This listing is for one MFJ-1982MP. Schematic fig1. (A 5/8 wave antenna is 0. (And, no, a "counterpoise" is not the answer!) While manual L-net tuners work fine for matching EFHWs, the automatic. But it can also mean a resonant quarter-wave wire. Page 2 MFJ-1625 Instruction Manual Window/Balcony Mount Antenna 2. End-fed horizontal wire, an EFHW, offers the perfect solution for a wide range of All-Band 80-10 Meter End-Fed Half-wave Antennas - MFJ 1982,1984 Cover all HF bands with one single wire and no tuner! to ensure great performance in a wide range of operating conditions. It consists of 30ft of wire fed into a 9:1 UnUn (Unbalanced to Unbalanced). Review (mpn: EF-53 for sale) EF-53 PRINCETON Meter Fed ANTENNAS Antenna Wire 80 6. This is a balanced antenna and does not use a ground plane ( counterpoise ). This is the feed impedance and SWR of an end fed 80 meter half wave with an ideal 49:1 transformer and good stable counterpoise or ground. 45 - Bisquare Loop Antenna. The end fed antenna functions well in several configurations including horizontal, sloper, and vertical configurations. Built to spec works fine, but I want a low-profile antenna for 6m and the coax trap/choke is a bit too bulky (50mm diameter). 46 - Piggyback Antenna for 10m Double Windom for 9 Bands. This End-fed antenna has a rating of 2kw which is more than enough of a buffer for me. Your antenna acts like a center-fed dipole instead of an end-fed dummy load and adds up to 3db to your TX/RX signal. The antenna's length (approx. The end fed 1/2 wave antenna, much like the 43 foot vertical, has become a cult phenomena. Because the ½-λ end-fed whip is a complete antenna, it’s the best choice for remote-mounting when a ground-plane isn’t available. 5 ft and 186 ft / 33 ft The entire antenna is #12 stranded insulated copper. The antenna can be pole mounted at ground level or elevated depending on the user personnel requirements. 5 Wave-Length wire on lowest band (130ft on 80m, 67ft on 40m) Fed from one end using a transformer in a box. This article will describe a 40/30/20m band end-fed half wave antenna, focusing on its matching unit. 7,764,244), and end mounting insulators (U. A common basic antenna is the 1/2 wavelength dipole. The overall length of the antenna is 76' (22' for each doublet leg plus 54' of feedline) so this antenna should be easy to tune on 10, 15, 20, and 40m. There has been much written here about counterpoise ground installation, but after reading many post, reference books, etc. 00 and some time to wind. Well I can tell you that a counterpoise will be made, whether you know it or not. 5' for 20m). The magic lengths to use with the End Fed longwire is 29, 35. Probably the most familiar is the end fed half wave antenna (EFHW) But random length or non-resonant end fed antennas are also popular and effective, especially for portable use. PVC is a soft material so it is not unusual for the rivets to want to pull through. No counterpoise wire or ground is required, but it is suggested for best performance. HF End Fed Antenna 40-6 meters | eBay. 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. First, setup your end fed half wave tuner (ex. Length of counterpoise should be a minimum of 30-40 feet but not the same length of the antenna wire. Lengths like 40, 80, and 110 feet work well. As long as you are feeding the wire in 1/2 wavelength multiples you don't need ground radials or a counterpoise. The antenna wire is 26 AWG copper clad steel wire with a great "silky" jacket. I've used EFZ's over the years, along with many other cheap and easy wire antennas. For example a 32 foot length is actually a half wave on 20m with an impedance of about 3500 ohms and requires a 50:1 balun. Next, create the counterpoise. Real World Measurements of a Multi-Band End Fed Antenna using a 9:1 Un-Un Excited as I was to get on the air with my new antenna, I didn't take record any data regarding its SWR, radiation resistance (RR) and resonant point (X) with my antenna analyzer. End-fed ase Flange Mounting Detail (common for all feed types) 8 HOLES Ø13. Using the technique of your choice, support the other end from a tree or other tall support. Once finished trimming, temporarily reconnect the short and long 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 portable operation. Whether you're QRP backpack, vacationing, emcomm station, or an antenna neighbors will never see, MFJs got an EFHW for you: MFJ-1982LP, $49. The end fed 1/2 wave antenna, much like the 43 foot vertical, has become a cult phenomena. The end fed half wave antenna can be operated with a small counterpoise, and in some instances, no counterpoise is used at all, although this is not necessarily wise. Above is a close up view of the current amplitude and phase distribution at the left hand side of the antenna system. It is 80 feet long and off-center fed as a Windom with a single wire lead-in to a tuner. There has been much written here about counterpoise ground installation, but after reading many post, reference books, etc. NEW 300W PEP VERSION!!! Easy and fast installation. I've used a similar length non resonant wire with 9:1 transformer and a single counterpoise wire ~65' with same results. My antenna is NOT an end fed Dipole. An end-fed half wavelength wire and small coupler is my default portable antenna if I just want to take the minimum. These antennas can be mounted horizontally, vertically or as a sloper. This is purely unintentional as I had made that wire at least a month or two before I ever knew about the aftermarket antennas. The resonate end feds are usually fed with a 1 to 64 impedance unum. Figure 4: A center-fed dipole antenna such as this 2. A very simple antenna to make, deploy and use is an end fed wire antenna. I found the counterpoise did make a difference to my swr so try a different length. 625 of one wavelength). The W1SFR End Fed Antenna is 35′ long and made with 18 ga Davis RF “PolyStealth” antenna wire, or Wireman “silky” 18ga. 5MHz) therefore also resonant on second, third, and fourth harmonics, etc. The magic lengths to use with the End Fed longwire is 29, 35. Attach one end of your antenna wire to one of the binding posts, either directly or using a jumper wire. The SWR was adjusted using the tapping point on the coil near the feeder. 70 Antenna Ideas lulian Rosu Y03DAC / VA31UL Rhombic Inverted-Vee Antenna Counterpoise Longwire Bisquare Loop Antenna Center Fed-Zepp Antenna for 80m - 40m. I can confirmed, it works much better and it is more easy to find a very low SWR on 40/20/10 meters. Figure 2 Multi-band travelling wave antenna with an earth or earth plus counterpoise and 9:1 voltage unun. 5m long EFHWA in Inverted Vee form, the middle hoisted into a tree. The re-maining wire remains on the wind-ers. With my end fed for 40-20-10 m I put a signal out on other bands with a tuner, but reception was poor. 21 'Length of whole antenna SY L=4. Dipoles need to be half a wavelength long, locating these long antennas can be an issue, especially when we are aiming for the 80 metre band or lower. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. 5 ft and 186 ft / 33 ft The entire antenna is #12 stranded insulated copper. If possible, run the counterpoise away from or perpendicular to the antenna wire. Even though I’ve came to many new insights, I think it’s still a good starting point for amateur radio operators that are interested in building a Half Wave End Fed (HWEF) antenna while most of the principles remain valid. Alternate configuration includes end 9:1 voltage unun and 50ohm dummy load. 160 Meter Folded Counterpoise Inverted L Antenna - Duration: 18:21. Step#4 --- Attach the end of the antenna wire with the insulator to a high support. Measurements reveal the coil to be 51 turns of 26 AWG wire wrapped around a. Using the standard formula, (468) for a half wave, we multiply times 2 = 936 for a full wavelength. Repeat the experiments above with the EARCHI end fed matchbox for comparisons. I have the current Rybakov antenna setup as a baseline. Typically, performance is better with no ground at the antenna, but you can try both ways. The reason is not complicated. The coupler was tuned to resonance on the bench first using a resistive load. Think of the OCFD as a end-fed antenna with a small counterpoise (or a vertical lying on its side ;-) I connect the shield of the coax to the short leg of the off-center-fed dipole. I will be interested. The end fed half wave antenna can be operated with a small counterpoise, and in some instances, no counterpoise is used at all, although this is not necessarily wise. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Based on the well known W3EDP design, This version incorporates the counterpoise in the 300 ohm ribbon cable. The ATU can be either preset or automatic and may require a control cable in addition to the coaxial cable feeder 15. This is a must have antenna for emergency HF or permanent station installations. The 90 foot start-to-finish dimension just fits my city lot. Marconi antennas or end-fed antenna systems located far from earth require counterpoises. An antenna system including: a driven element, and. The following data are for the far field radiation patterns and 3D color views of an End Fed Half Wave Inverted-V antenna with the high point in the center at 40 feet and the ends about 10 feet over ground. This is an End Fed Long Wire wire antenna that will cover all bands from 160 to 6 meters, including the WARC bands, as well as 60 meters and MARS frequencies. On 40 m the SWR was very close to 1:1. This formula takes into consideration the capacitive "end-effect" from insulators which shortens the physical length requirement for the equivalent electrical length. The dipole referred to here to is a 1/2 wave dipole. They differ slightly because VE3EED used the center of the bands in his calculations, while AB3AP used the center of the CW portion of the bands. I have installed an inverted L, end fed antenna, with a single wire feed length of 31'-6" connected to an MFJ-941 Versa Tuner II. 0 MHz rated at 2 KW (SSB) The DXTREME models are the ultimate end-fed antennas with the capability of covering from 160-6 Meters and able to handle legal limit power handling with ease. New style resonant end fed antenna requires no counterpoise. Above is the model topology. Hang the insulator end from a tree limb or pole and attach the coax to the BNC connector. I can confirmed, it works much better and it is more easy to find a very low SWR on 40/20/10 meters. Mark pa1ssb heeft een 80 meter qro end fed gebouwd met een tegencappaciteit. 00 Folded Terminated Dipole (FTD) $318. 950MHz with an SWR of 1. You do NOT need an additional counterpoise or ground wire with this antenna. 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. Figure 4-16. Full size version with wire length 41m. It uses The counterpoise should be 3 to 4 inches above ground. This is purely unintentional as I had made that wire at least a month or two before I ever knew about the aftermarket antennas. The end fed half wave antenna can be operated with a small counterpoise, and in some instances, no counterpoise is used at all, although this is not necessarily wise. On higher floors you'll need a counterpoise. (4) When installing, ensure that the drain hole in the body of the balancing network is facing down. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6. The reference antenna is an end fed inverted L with a counterpoise of 60 100' radials. 7) is of actual measured data of an end fed half wavelength antenna with an isolated coupler using an 8:1 turns ratio. 54 - All-Bands Dipole Antenna. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Multiband Tuned Doublet Antenna 14 21. Some designs connect one end of the secondary coil to the antenna socket, which then makes the coax shield act like a counterpoise. The key to these antennas is to have an elevated counterpoise. be brought down with one of the counterpoise mentods outlined in the instructions The feed can be converted to RTS a± any time by ordering a suitable length of transmission line (Saxton #1562). Previously that inverted L "stealth" antenna had been worked against a. After giving some thought to my antenna systems and the installation of an earth spike, I wondered about adding a balun to the longwire. Antenna and counterpoise hardware arestainless steel. No counterpoise wire or ground is required, but it is suggested for best performance. The antenna can be fed against a counterpoise laid on the ground. Unlike typical antennas, this is a non-resonant, End-fed antenna. Shorter length counterpoise wires can be used if operation is confined to 40m or higher. 2 m radial, giving a vertical cut at l/2. They rely on return ground currents and use the ground as part of the antenna system. It should be noted with end fed antennas there still has to be counterpoise, very often it is the shield of your coax run. The Hertz antenna is an antenna with an electrical length of a half wavelength at its resonant frequency. If possible, run the counterpoise away from or perpendicular to the antenna wire. Length, Stainless Steel Hardware, SO-239 Connector, Each Not Yet Reviewed Part Number: PEZ-EF102040-239 More Detail. Counter to tuning a length of wire like you would with a dipole, with a random. maybe better. Run at least 16ft of coax to antenna. This calculator is designed to give the vertical length (height) of a quarter wave ground plane antenna, and the length of each of the four radials (often called radiators) for the frequency chosen. Note that any of these lengths are going to be long on 6 meters. Right Angle Marconi Antenna 17 26. Cheap HF Antenna - Just Use A Simple Wire A cheap HF antenna can be made using a simple piece of wire. It consists of 30ft of wire fed into a 9:1 UnUn (Unbalanced to Unbalanced). Sometimes however, the centre feed is not ideal, for example when you want to use it as a vertical. 10m counterpoise produced excessive impedance at the end fed transformer secondary, which the transformer was not designed to match. 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. You just have to through the wire over a branch, tie the ends off and start operating. The antenna displays a low feed impedance, which allow you to feed it directly with 50-ohm coax cable. SE X80 Vertical HF Antenna. My goal to test and select the antenna which represents the best compromise of volume, mass, ease-of-construction, ease-of-erection, and gain when used in portable operation with a backpack HF transceiver. This formula takes into consideration the capacitive "end-effect" from insulators which shortens the physical length requirement for the equivalent electrical length. "An Unorthodox Antenna"): an 84' long end fed and a 17' long counterpoise (6. Mark pa1ssb heeft een 80 meter qro end fed gebouwd met een tegencappaciteit. Run at least 16ft of coax to antenna. A definite must have accessory for radio amateurs using random length or inverted L antennas. P&P: + £11. Satisfied that the antenna worked by making QRP contacts […]. The end fed antenna system works well in horizontal, sloper, and vertical. Being able to feed the dipole from one end gives you more options on how to. • There is no special length for a G5RV; it only needs to. The coax connector is at one end of the dipole, where it is most needed. 100% water proof. Connect the VNA now at this center location to determine the required reactances for resonance at 3. No counterpoise wire or ground is required, but it is suggested for best performance. After giving some thought to my antenna systems and the installation of an earth spike, I wondered about adding a balun to the longwire. That makes the total radiating element length 270. This length turns out to be just about 70 feet for 3. polyweave antenna wire with heavy duty insulator. In this configuration the coax shield will act as your counterpoise. Also another unusual coincidence is that the length of my counter poise wire that I made a year ago, also happens to be close to the length of the NA-771 antenna (counterpoise is 16. As we discussed on the first page of this article, a length of wire or coax that is 1/4 wavelength long is an impedance inverter. Steve Nichols G0KYA Contents 1. radial RF ground field cancellation that other solutions do not offer. The end fed antenna functions well in several configurations including horizontal, sloper, and vertical configurations. End Fed Wire: The first antenna that I put up was a simple end fed wire. Hi Scott --- A true random wire antenna is the length of wire you can fit between your end supports. The SWR was adjusted using the tapping point on the coil near the feeder. That's a lot of wire at, say, 3. part of the half wave antenna. I chose the EARC end fed 6-40. I am a coffee snob too, but that is another story. Effective Length of the Antenna: The length of an antenna which, if carrying a constant current along its whole length equal to the current at the feed point, would radiate the same power. The W3EDP end fed wire antenna lends itself readily to QRP and portable operation. Its length is not critical, and it does not have to run directly under the antenna wire. MININEC predicts for the impedance of an end fed halfwave antenna versus the "counterpoise" length. Cul = transformer wire. 50 for the FL-259 soldered to the end of the Line). First, setup your end fed half wave tuner (ex. The re-maining wire remains on the wind-ers. 30 Watts QRP, 80-10 Meters, 132 feet. Ideal for camping, weekends away, holidays etc. HF End Fed Antenna 40-6 meters | eBay. 5MHz) therefore also resonant on second, third, and fourth harmonics, etc. SWR will vary based on topography, proximity of nearby structures, configuration of the antenna wire and choice of ground or counterpoise. The author then divided it by 4 to make a "quarter wave" antenna length of 30mm. Question I have is about the coax. I ordered the counterpoise that Ultimax offers for their antennas. Portable operation could not be easier. PackTenna makes ultralight, portable HF amateur radio antenna systems and accessories. New box design with side tabs for easy hanging, relocated antenna connector, improved ez-tune matchbox. All on one end fed wire. 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. The Counterpoise and hoop assembly includes a Counterpoise support bracket, 4-80" rods, Counterpoise Hoop - a 35' length of copper wire with a ring terminal, a 4' length of Dacron with a ring terminal, 3 counterpoise End Caps and a 4' 9" fixed wire extension with 2 ring terminals. We sometimes cannot freely choose our ground or counterpoise systems. ) * However as a. This calculator is designed to give the vertical length (height) of a quarter wave ground plane antenna, and the length of each of the four radials (often called radiators) for the frequency chosen. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. However, Guy Olinger,K2AV, has created an alternative - the folded counterpoise (FCP). This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. These whip antennas need to be well grounded. 00 Folded Terminated Dipole (FTD) $318. It is a resonant Half wave on 80m (3. Add three more 20 ft counterpoise for a total of 4. The Wire Antenna Element 'appears' to be Landscaping Cable. These antennas can be mounted horizontally, vertically or as a sloper. 0 'Length from start to coil SY Lcoil=0. 2:1 or better SWR on 20 meters without a tuner ! It is also fairly broadband since it’s a full size antenna. The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes. 45e-6 'Coil inductance (4. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. End fed antenna. Such systems are sometimes described as "groundplanes" or "elevated radials", although by definition they are also counterpoises. The Par End-Fedz are a full length half wave dipoles, but with an important difference. Most of the material I have read on the net about this type of antenna says the coax is used as the counterpoise but none discuss the coax length. 5 Wave-Length wire on lowest band (130ft on 80m, 67ft on 40m) Fed from one end using a transformer in a box. Steve Ellington 19,049 views. 625 of one wavelength). You can make it work on any band with the right length of antenna wire. The aerial wire enters the loft under a tile near the ridge of the roof of the house, through an insulating sleeve. A vertical antenna only has one mounting point and less wind resistance. Length of counterpoise should be a minimum of 20-30 feet but longer is better. It will present its parameters, so anybody with basic home-brew skills will be able to build it. It is a resonant Half wave on 80m (3. A tuner placed at the transmitter, fools a transmitter into working correctly. It is end fed. Pete called it the “No Counterpoise” antenna, and he’s done considerable EZ-NEC work on it. END FED 6-40 Meter Multiband HF Antenna Introduction This EARC project produces an inexpensive, multiband, end fed HF antenna matchbox that is The length of the antenna wire, and the lower wing nut provides a convenient counterpoise connector if needed. The versatile end fed wire A piece of wire of almost any length can be used as an antenna on the HF bands. I finally decided to try an End Fed Half Wave Antenna (EFHWA) and was pleasantly surprised! Just before 14:00 on Saturday 14th of July 2012, I heard Barrie ZS6AJY, first present on the CW Net, frequency, 7020 kHz CW. Typically, performance is better with no ground at the antenna but you can try both ways. This makes keeps the weight and bulk down while delivering a very strong antenna element. An end fed antenna with no counterpoise works perfectly fine on receive & all that adding a counterpoise with an end fed using a balun does is alters where the antenna performs at it's best. No counterpoise wire or ground is required, but it is suggested for best performance. This length turns out to be just about 70 feet for 3. As a result, if the ground sucks, the antenna will also. June 2018 - Updated January 2019. There are a lot of resources for EARCHI antennas specifically and end fed antennas in general and I found these two blog posts helpful: Portable Antennas: The EARCHI End Fed. Using the standard formula, (468) for a half wave, we multiply times 2 = 936 for a full wavelength. 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. This method is often called the END-FEED or VOLTAGE-FEED method. Most of the material I have read on the net about this type of antenna says the coax is used as the counterpoise but none discuss the coax length. Step#4 --- Attach the end of the antenna wire with the insulator to a high support. Rma required to return an item. N4KGL End Fed Antenna Configuration for Rapid Deployment The combination of an end fed wire and a 9 to 1 unun is very popular. Nobody adds a counterpoise to a Windom antenna… There's a 1/6th wave wire left and a 2/6th wave wire on the right. 5 EQUI-SPA ED Suitable for M12 or 1/2” olts Two-Section Four-Section Dimensions 5m nominal section length 2. about 15-20 meter long if I use a 41 meter long antenna wire. The antenna's length (approx. The end fed offers many alternative options. The VK4YE end fed antenna does need a small counterpoise of 0. Typically, performance. I honestly do not know if this is preferable as I have not done any comparative testing of the resulting radiation patterns. With our W3EDP-derived end-fed zepp, the antenna will work satisfactorily on 40, 20, 15, and 10 meters. These antennas can be mounted horizontally, vertically or as a sloper. Sloping Dipole Antenna 11 16. But in the case of the end-fed your equipment becomes the other side of the antenna. From Part 1 and Part 2 of the "Current Flow Fundamentals for an "End-Fed" articles, we saw that common. various length "counterpoise" we get the following currents measured at the feedpoint left-hand "radiator" and right-hand "counterpoise" wires. Your antenna acts like a center-fed dipole instead of an end-fed dummy load and adds up to 3db to your TX/RX signal. A friend of mine has a commercial antenna, which consists of a matching network, a trap and around 40 feet of wire. New box design with side tabs for easy hanging, relocated antenna connector, improved ez-tune matchbox. Either use a "counterpoise" at least 0. ----- That is it! You are ready to start making contacts. 2MHz, ground mounted) SWR - Actual bandwidth on the 50Ω side of the coupler will be much narrower, due to the tuned. The Par End-Fedz are a full length half wave dipoles, but with an important difference. The physical length of any HF antenna is critical to achieving resonance and good performance on a particular band. Portable End-Fed 160-10 Meters Dipole Antenna George on 24th Feb 2020 This is the 4th or 5th product that I have purchased 4 or 5 items from ni4l. 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 portable operation. , private detective. long, often too long for vertical deployment with telescopic poles and not too practical in highly constrained environments (i. SOTAbeams Half-Wave End-Fed Portable Antennas are half-wave end-fed antennas for hams on the move. End Fed Half Wave Antenna-11 Bands One Antenna! End Fed Half Wave Antenna-11 Bands One Antenna. Remember to include velocity factor before cutting the wire to length. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. My first DX contact with a vertical half wave end fed antenna was with VK6MV in SSB using the long path, with a 5-5 report. The reference antenna is an end fed inverted L with a counterpoise of 60 100' radials. The design of the antenna allows it to be installed in many ways. There has been much written here about counterpoise ground installation, but after reading many post, reference books, etc. How to create a counterpoise for an EFHW antenna is hotly debated. We will look both at the feedpoint, and at the current maxima for our typical ham “end-fed” installation. Cul = transformer wire. Using step 3, the desired length should be 34. Nobody adds a counterpoise to a Windom antenna… There's a 1/6th wave wire left and a 2/6th wave wire on the right. - End-Fed antennas have wild impedance swings. In this method the antenna is fed at a point of high voltage (the end). Usual hamtenna quality build. To me, this looks more like a 3-element Yagi which would make it end-fed. An antenna system including: a driven element, and. Improvising an End Fed Wire • Think about where most current will be – Current must be zero at an open circuit – Current will be max λ/4 (and 3λ/4) from an open circuit (low impedance, easier to match) • Could be closer if loading coils, capacitance – A high current point high and in the clear usually makes the antenna more efficient. The coupler was tuned to resonance on the bench first using a resistive load. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Have been experimenting with a flowerpot antenna, an ingenious way of using a single length of coax as a half wave antenna. The overall length of the antenna is 76' (22' for each doublet leg plus 54' of feedline) so this antenna should be easy to tune on 10, 15, 20, and 40m. This is a balanced antenna and does not use a ground plane ( counterpoise ). It consists of 30ft (10m) of wire fed into a 9:1 UnUn (Unbalanced to Unbalanced). This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. The Deluxe HF Multiband End Fed Matchbox Antenna allows operation on any band from 80 through 6 meters using an end-fed wire antenna approximately 30 to 60 feet in length. Hang the insulator end from a tree limb or pole and attach the coax to the BNC connector. Usual hamtenna quality build. The counterpoise to the antenna is the Earth itself. This antenna has been made popular by the Emergency Amateur Radio Club of Hawaii (EARCHI). , parallel tuned circuit link coupled) with a resistor across the output as shown on the schematic below. to ensure great performance in a wide range of operating conditions. The end fed antenna functions well in several configurations including horizontal, sloper, and vertical configurations. HF End Fed Antenna 40-6 meters | eBay. The end fed half wave. A very long counterpoise wire can work against this antenna as it begins to appear as a dipole resulting in the transformer that is designed to match impedances in ~2450 Ohms range is now the wrong type. B-5: Balun Designs 9 to 1 balun with 1/4 wave counterpoise the antenna current at midpoint was 210 ma. A radial/counterpoise field is not necessary with this EFHW wire antenna. The Buddistick, SuperAntenna MP1, Pac-12, and a Chameleon (it has various variants) all offer a short antenna with multi band capability. 5' for 20m). Right Angle Marconi Antenna 17 26. The antenna we used was a portable multi-band end-fed half wave (EFHW) coax act as a counterpoise and b) stop RF getting The matching unit The impedance at the end of a half wave antenna is. The answer proposed by some is a three terminal feed device, and an additional short conductor to act as a so-called counterpoise (Duffy 2010). In most cases, a sloper mounted on a tower, then the tower and importantly, the beam mounted on top, act as the counterpoise. Simply type --- end fed antenna ---- into the E-Bay search box and it will take you to all of our "QSO-KING" models. the antenna is end-fed. Hang the insulator end from a tree limb or pole and attach the coax to the BNC connector. Installation Notes There are several methods of installing the antenna and some are better than. PackTenna makes ultralight, portable HF amateur radio antenna systems and accessories. This is an antenna that can really make you grind your teeth at night. NOTE - At 50 Feet this End-Fed Half-Wave Dipole Antenna should be roughly Resonant at 9. However, it is 85 Ft. Mark pa1ssb heeft een 80 meter qro end fed gebouwd met een tegencappaciteit. That's a lot of wire at, say, 3. End Fed Half Wave Antenna Coupler The finished End Fed Half Wave antenna coupler. Fast Setup and. 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. 50 - Collinear Trap Antenna. 5, but because the inductance is at the max voltage and minimum current point for 406, it doesn't effect tuning for 406 much. Next, create the counterpoise. The first thing I did was buy some 24 guage black wire, specifically this 100 foot spool. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. Whether you`re QRPbackpack, vacationing, emcomm station, or need an antenna neighbors will never see, MFJs got an EFHW for you: MFJ-1982LP, $59. If you are only interested in operating 40 through 10 meters, you can try 36, 44, or 49 feet. You would eliminate a source of unwanted interference: the "floating coax shield". At the end, the antenna wire is terminated at about 15 feet above the level of the back yard. Ver2cal'Wire'Antenna' • Actually'a'ver2cally'orientated' resonate'1/2'wave'dipole'with' the'earth'being'the' return ' half' • Due'to'poor'ground' conduc2vity'a. So do all antennas, but not at the design frequency - there, at the design frequency, the terminal impedance is quite predictable. However, increasing the number of counterpoise wires will increase the efficiency of the antenna, with. Antenna tuner is needed on 20 and 17m and to extent the bandwidth on 10m. This discovery made me take another look at the design of J Pole and End fed Zepp antennas. Being able to feed the dipole from one end gives you more options on how to erect an antenna and makes portable operation easier. End Fed Half Wave Antennas VS Random Length End Fed Antennas - Duration: 18:04. (5) A good quality 50 ohm coaxial cable should be used for the feedline. Even though I’ve came to many new insights, I think it’s still a good starting point for amateur radio operators that are interested in building a Half Wave End Fed (HWEF) antenna while most of the principles remain valid. The end fed antenna functions well in several configurations including horizontal, sloper, and vertical configurations. multiband end‐fed antenna with no counterpoise cables on the ground. the counterpoise to an inverted L antenna which was operated against those counterpoises as an all-band antenna fed by a "tuner". ) I modeled several types of antennas using the 11. 40 and 20 meter are my favourite bands. This antenna works on 80 - 40 - 20 -15 and 10m. 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. P&P: + £11. SE X80 Vertical HF Antenna. (Counterpoise) In the case of the End Fed antenna, you can simply make an extra connection and connect it to the coaxial cable shield. The Deluxe HF Multiband End Fed Matchbox Antenna allows operation on any band from 80 through 6 meters using an end-fed wire antenna approximately 30 to 60 feet in length. For the price you can't beat this antenna. It should be noted with end fed antennas there still has to be counterpoise, very often it is the shield of your coax run. In this configuration, the coax shield will act as your counterpoise. Built to spec works fine, but I want a low-profile antenna for 6m and the coax trap/choke is a bit too bulky (50mm diameter). Repeat the experiments above with the EARCHI end fed matchbox for comparisons. ( not recommended for any of the HW-end fed models ) Description: Length of lead wire to network: 6' ft. NOTE - At 50 Feet this End-Fed Half-Wave Dipole Antenna should be roughly Resonant at 9.  counterpoise or an amputated G5RV with a 1/2 length of its ladder portion transferred to the radiating wire: (what in the G5RV is 34 Ft of parallel feeder and 51 Ft of radiating wire arm, in the W3EDP becomes 17 Ft of parallel line and 68 Ft of single wire…). 647 MHz and 10. No counterpoise wire or ground is required, but it is suggested for best performance. This length turns out to be just about 70 feet for 3. For example a 32 foot length is actually a half wave on 20m with an impedance of about 3500 ohms and requires a 50:1 balun. The counterpoise can be anything, think of: a piece of wire, the zinc gutter, the antenna mast or a ground pin. Because the ½-λ end-fed whip is a complete antenna, it’s the best choice for remote-mounting when a ground-plane isn’t available. A simple matching unit is needed to couple the wire to the rig and a counterpoise is required for some bands, however there is room for experimentation here. The End-fed Half-wave (EFHW) EFHW antenna without a counterpoise may well give rise to problems of various sorts; it's parallel tuned, and the antenna length is selected to give good performance on the traditional ham bands, although mine works well on the WARC bands, too. HFEDZ 10M-80M END Fed Half Wave (49:1 EFHW) HF HAM Radio Antenna - $84. 95 DX Off Center Fed Windom $69. We strung it in the trees of the campsite, fed-end high with a 60 foot RG58 feed, 45 degree of slope with 35 feet of wire. 45 - Bisquare Loop Antenna. The figure 8 - blue line (grounded end) is exactly what I am experiencing with my end fed strung at my back yard. What is claimed is: 1. To use it on 30, 12 and 24 meters does require a tuner. ) I modeled several types of antennas using the 11. Ideal: Sloper configuration with one elevated counterpoise is good but several different length counterpoises maybe better. Determining Length of Antenna 468 / F(MHz) = λ /2 in feet for antenna. The answer proposed by some is a three terminal feed device, and an additional short conductor to act as a so-called counterpoise (Duffy 2010). Length is not critical, but best longer than 50 feet. All on one end fed wire. Make this from a piece (19. Antenna and counterpoise hardware arestainless steel. This calculator is designed to give the vertical length (height) of a quarter wave ground plane antenna, and the length of each of the four radials (often called radiators) for the frequency chosen. Call us at from central time m f or use messaging sales for us customers only8 Kansas residents pay sales tax. End Fed Half Wave Antenna-11 Bands One Antenna! End Fed Half Wave Antenna-11 Bands One Antenna. The end-fed half wave antenna uses a matching transformer with a high transformation ratio, around 50:1. The end-fed feature adds convenience, and makes it very portable. MBITR Tactical Vest Antenna $124. Rma required to return an item. The antenna, containing the poise 103 and the counterpoise 104 can have a small gap G 2 between the two ellipses, can be fed electromagnetically at this gap by a micro-strip line 108 that can come in at an edge of the substrate 106 at one end of the antenna 100, i. The Radiowavz Pathfinder Ranger is a end fed all band Antenna designed originally for the military as a grab and go antenna system to be deployed into tactical situations. Figure 4: A center-fed dipole antenna such as this 2. Only now, cut the antenna at its 50% center. In this configuration, the coax shield will act as your counterpoise. 5MHz) therefore also resonant on second, third, and fourth harmonics, etc. 160-6 METERS END-FED ANTENNA The ULTIMAX DXTREME end-fed antenna covering 1. 1), an end-fed half-wave antenna needs a 0. 95 Saturn Fan Dipoles $159. A counterpoise is simply a long, insulated wire that attaches to the ground connection on your antenna tuner. "An Unorthodox Antenna"): an 84' long end fed and a 17' long counterpoise (6. It is a resonant Half wave on 80m (3. 35 MHz @ 31 Meter Band. The antenna. Would this setup be effective for the 15 meter band without the use of antenna tuner (since the 15 meter. The end fed antenna functions well in several configurations including horizontal, sloper, and vertical configurations. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. The antenna length was calculated as 300/2450 = 0. VHF 1/2wave vertical antenna for the 6-meterband (50 Mhz) RE-A50V12 By Guy, de ON6MU. Its generally 51 feet a side or 102 feet, and fed in the center like a dipole except that its fed by (ladderline) twinlead of 29-35 feet. MBITR Tactical Vest Antenna $124. Length, Stainless Steel Hardware, SO-239 Connector, Each Not Yet Reviewed Part Number: PEZ-EF102040-239 More Detail. G5RV Antenna 15 22. I've used EFZ's over the years, along with many other cheap and easy wire antennas. " The very valid reason for this is that the high impedance of the feedpoint was outside the range of most transmitters and external tuning units. A multi-band end fed wire antenna presents a potential problem in that a ¼ wave length antenna cut for say the 80 metre band will present a feed impedance of about 70 ohms however when the same antenna is used on the 40 metre band the feed point impendence will be several thousand ohms and therefore difficult to achieve a match even with a. The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes. Web Site of PA3EKE Hy End Fed Antenna. An overview and where it all started 2. HF End Fed Antenna 40-6 meters | eBay. A counterpoise is simply a long, insulated wire that attaches to the ground connection on your antenna tuner. 5, 41, 58, 71 and 84 feet. It is 80 feet long and off-center fed as a Windom with a single wire lead-in to a tuner. Steve Nichols G0KYA Contents 1. Hang the insulator end from a tree limb or pole and attach the coax to the BNC connector. Great for your FT-817D, KX2, KX3, and other QRP radios. The Buddistick, SuperAntenna MP1, Pac-12, and a Chameleon (it has various variants) all offer a short antenna with multi band capability. The problem with an end fed half wave antenna is that the antenna presents a high impedance, creating a. ***We make this same antenna design in many different lengths. 5, 41, 58, 71 and 84 feet 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. 625 of one wavelength). various length “counterpoise” we get the following currents measured at the feedpoint left-hand “radiator” and right-hand “counterpoise” wires. 160M Is a Tough Band • Propagation quite variable, signals often not very strong, heavy QRN during the summer -Mostly a nightime band, varies a lot through the night -During the winter, 800 miles or more is possible 2 hours before sunset, 2 hours after sunrise. 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. End Fed Wire: The first antenna that I put up was a simple end fed wire. If you are setting up a portable station and plan on using no additional "counterpoise" then just hook up all of your equipment. No counterpoise wire or ground is required, but it is suggested for best performance. In the antenna current diagram (top) there is a simulated counterpoise and small. Here is an ARRL. Once finished trimming, temporarily reconnect the short and long end. What you should have is a HIGH VOLTAGE. The normal quarter wave ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding. 160-6 METERS END-FED ANTENNA The ULTIMAX DXTREME end-fed antenna covering 1. 45e-6) SY EndHeight=1. With my end fed for 40-20-10 m I put a signal out on other bands with a tuner, but reception was poor. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. Each of the four sides is the same length – about a quarter-wavelength to one wavelength per section – converging but not touching at an angle of about 42° at the fed end and at the far end. The Delta Loop is not only a great transmitting antenna but a low noise receiving antenna. A multi-band end fed wire antenna presents a potential problem in that a ¼ wave length antenna cut for say the 80 metre band will present a feed impedance of about 70 ohms however when the same antenna is used on the 40 metre band the feed point impendence will be several thousand ohms and therefore difficult to achieve a match even with a. Counterpoise isn't required if the feedline is long enough, the outside of the coax is your counterpoise! I have some FT140-43 and FT114-43 cores and might try this type of antenna, but I'll use RG8X for the feeder. 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. The first 6ft (1. Being able to feed the dipole from one end gives you more options on how to. This is the gold standard. End Fed Wire: The first antenna that I put up was a simple end fed wire. These antennas can be mounted horizontally, vertically or as a sloper. An end fed antenna with no counterpoise works perfectly fine on receive & all that adding a counterpoise with an end fed using a balun does is alters where the antenna performs at it's best. 5", NA771 is 15. Practical HF Antennas The Radio Communication Handbook 15. Well I can tell you that a counterpoise will be made, whether you know it or not. The benefit of this antenna over my existing 44' doublet fed with military 72Ω twinlead is that this antenna is made of continuous lengths of wire with no solder-joints to fail. connected to the ground lug on the network of the antenna and you're ready to go. It is used with radio transmitters or receivers when a normal earth ground cannot be used because of high soil resistance or when an antenna is mounted above ground level, for example, on a building. Lengths like 40, 80, and 110 feet work well. 5″ for 220 and 6. The usual way of feeding an end fed half wave is against a short counterpoise, but I have found that with QRP you can feed this one without an earth stake, counterpoise, or radials. Signal reports indicate the Bobtail is consistently + 2-4 S units compared to the L into Europe and with less QSB. The aerial is voltage-fed (high impedance) and the antenna matching unit (AMU) transforms this to match 50 ohm cable. It has become nearly as popular as the famous G5RV after all! It gives full HF coverage with no tuner needed on most frequencies, you do not need a long counterpoise, radials or feedline, it has a rugged weather-resistant 50 Ohm matching network, it is a super fast set-up and. The wire length is around 65' with a vertical section of 13' (maximum height allowed to keep the xyl happy!), the rest fed up to the peak of the roof which is around 30'. I found the counterpoise did make a difference to my swr so try a different length. That is the LNR end fed dipole which is for specific bands, ie. 95 Saturn Fan Dipoles $159. Typically, performance is better with no ground at the antenna, but you can try both ways. Antenna and counterpoise hardware arestainless steel. I was very surprised to find that the Imax 2000 is not a 5/8 wave as advertised. Mark pa1ssb made a qro 80 meter end fed antenna with a counterpoise. On 160m the antenna is 17. The Wire Antenna Element 'appears' to be Landscaping Cable. 5 inches from each end of the antenna. Jack greatly enjoyed big 160 meter transmit and. A radial/counterpoise field is not necessary with this EFHW wire antenna. Counterpoise. The Wire Antenna Element 'appears' to be Landscaping Cable. Attach one end of your antenna wire to one of the binding posts, either directly or using a jumper wire. First, setup your end fed half wave tuner (ex. Here is an ARRL. Antenna portion is made from 30' of premium 18 awg stranded copper wire. maybe better. There are a lot of resources for EARCHI antennas specifically and end fed antennas in general and I found these two blog posts helpful: Portable Antennas: The EARCHI End Fed. The original W3EDP antenna was directly coupled to the transmitter tank coil. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. Length: 60’ Weight: 3. The counterpoise can be anything, think of: a piece of wire, the zinc gutter, the antenna mast or a ground pin. 950MHz with an SWR of 1. It is a resonant Half wave on 80m (3. The ATU can be used with end fed "aerials", including inverted L antennas. 03 'Length of coil SY L2=39. Next, create the counterpoise. That's a lot of wire at, say, 3. A simple matching unit is needed to couple the wire to the rig and a counterpoise is required for some bands, however there is room for experimentation here. In some designs, my earlier ones included, we make a resonant circuit using a toroid coil and capacitor to. The AP-10B utilizes a counterpoise to make the antenna function properly. Hang the insulator end from a tree limb or pole and attach the coax to the BNC connector. Built to spec works fine, but I want a low-profile antenna for 6m and the coax trap/choke is a bit too bulky (50mm diameter). The End Fed Half Wave antenna (EFHW)for SOTA portable operation…from bits and pieces in the Junkbox… Whilst leisurely chasing activators this morning, I also took the opportunity to rummage through my Junkbox to see if I had all the bits and pieces to make an end fed half wave antenna for the 40M band. , I'm still not clear on the correct way to install the system. 21 'Length of whole antenna SY L=4. This may be achieved by utilizing an extensive earth-net or counterpoise respectively in order to cover all short wave bands. 2: A remotely fed long wire antenna arrangement. An end-fed zepp will work on its fundamental frequency and on odd and even harmonic frequencies (that is, where the flattop is an odd or even multiple of a half wave). New style resonant end fed antenna requires no counterpoise. PackTenna makes ultralight, portable HF amateur radio antenna systems and accessories. Cul = transformer wire. I’m using a 100-foot longwire antenna fed with an MFJ tuner. This can be a few wires of random length. 80/40 Resonant End Fed (sloper, loaded end at 25 feet, feedpoint at 3 feet) Test Procedure. 03 'Length of coil SY L2=39. Would this setup be effective for the 15 meter band without the use of antenna tuner (since the 15 meter. HF End Fed Antenna 40-6 meters | eBay. The “senior” (full-length) W3EDP, as originally described (QST March 1936, pp. It is a resonant Half wave on 80m (3. Update to my review from last March 2019, I added 50 more feet of antenna wire and my end-fed antenna really came alive, especially NVIS! Now, if I hear them, I can usually work them. connected to the ground lug on the network of the antenna and you're ready to go. This length turns out to be just about 70 feet for 3. Antenna tuners are generally located at the trans-mitter output, at the radio end of the coaxial feed line. For 2-meters, a ½-λ end-fed whip is about 36” long. Built to spec works fine, but I want a low-profile antenna for 6m and the coax trap/choke is a bit too bulky (50mm diameter). 5MHz) therefore also resonant on second, third, and fourth harmonics. I decided to bring an end fed antenna to the party. I have done several Field Strength Readings in the field and in a…. Portable operation could not be easier. No ground plane or counterpoise is needed. Fast Setup and. End Fed Half Wave Antenna Coupler Schematic – 7-30MHz For calculating the length of a half wave in metres, I use 141÷ƒ(MHz) for wire elements. Antenna is a tuned length dipole antenna using Kevlar cored radi-ating wire, fitted with frequency la-bels to indicate tuned lengths. Right Angle Marconi Antenna 17 26. (End-fed 1/2 wave feed impedance decreases, while center fed half-wave antenna impedance increases with added loss!) With a small counterpoise and end-feed we need to: keep the antenna clear of lossy media including the earth. Warning: PHP Startup: failed to open stream: Disk quota exceeded in /iiphm/auxpih6wlic2wquj. MY FINAL SET-UP: I started my experiments with. Antennawire length is aprox.