80m trap dipole. That makes a very convenient tri-band .

80m trap dipole At the resonant frequency the two traps shows a high impedance, in series with the antenna wires, and very little RF energy goes past the trap. Five Band Trap Dipole Antenna W-735 - 80m/40m. The antenna is completely mounted and equipped with a socket SO239 on the balun for the direct connection of a 50 Ohm coaxial cable If you consider that a 1⁄2 wave dipole for 40m is about 65 feet, the traps trim about 15 feet off the full-size dipole. The list of major tuning / design parameters include the following: Length overall of radials, vertical section, and top horizontal section. The wire used is #14 AWG Flex-Weave. Available in 20+40M and 17+30M versions Approximately 30% shorter than a full size dipole Weighs approximately 4 ounces. Sep 16, 2019 · A dipole is resonant on one frequency (and all odd harmonics), with a trap you can design it for more frequencies. BTW, Unadilla has just introduced a set of 60 meter traps for those 40 meter and 80 meter dipole users -- that would like to add the 5 channels to their antenna system! w9gb Ken Bessler 21 years ago This antenna is perfect for amateur radio enthusiasts looking for an easy-to-install, high-performance dipole antenna that delivers exceptional results. If you're looking for a high-efficiency, wide-bandwidth monoband or multi-band versions, DX Engineering has them! HF Multi-band Wire Dipole (Trap Dipole) Antennas Diamond W-Series W-8010 - 80m/40m/20m/15m/10m. My lot is only 9 meters wide and around 13 meters length is available for antennas and wires (behind the house). More designs can be found by Googling “80m loaded dipole. The antenna described here is for operation on 40 m and 80 m. I followed an article by John DeGood, NU3E and got following measurements: From balun to 20m trap: 485 cm From 20m trap to 40m trap: 362 cm F Dual-band dipole elements Some years ago I was experimenting with a dipole kit for NVIS operation on 40, 80, and 160m. Sep 21, 2020 · This made the whole antenna nearly108 feet long. 5mm² section, the length is longer than 4mm². 2 kW PEP, UHF female/SO-239, 85. I'd had some success building a trap dipole for the WARC bands using coaxial traps. at the best online prices at eBay! Free shipping for many products! Full article on how to build a home-made wire dipole antenna for 40 and 80 meters band. The document provides a brief guide on building a compact dipole . ” Nov 24, 2007 · This Antenna design was one that I used about 4 years ago, it worked exceptionally well on 80m and 40m. The input impedance on each of the design bands will be such that a tuner will not be needed when going from one band to another. Reviews For: MFJ-17758 80/40 Meter Dipole Antenna Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. net My quest for the ham radio equivalent of the “holy grail” – a truly broadband 80 meter dipole – began in the spring of 2008, when I moved into my new QTH on five wooded acres in a semi-rural area. The ends of the 80m segment are looped back on themselves by about a foot and twisted to anchor to the end insulator. Multi-band Trap Dipole The Trap Dipole antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. Polyethylene black jacketed FLEX-WEAVETM, 168 copper strands for high abrasion/rodent resistance light weight making this a excellent choice for the 125' length. Order Kelemen Double-Band 80M & 40M Dipoles in North America exclusively from DX Engineering. 5-7 MHz)"}, {"Watts":"1. Apr 30, 2021 · In this article I share what I've learnt playing with 80m dipole design and testing different antennas in the field. The connections use M4 stainless steel nuts, bolts, and washers. Individually pretuned matched traps for each band, 50 Ohm feed, coaxial cable not included. Mar 26, 2025 · The connections use M4 stainless steel nuts, bolts, and washers. Hams can […] Trap dipole antenna for 20 and 40 meters Similar to what I had built two years ago, I thought I’d present another dual-band HF dipole antenna, for 20 meters and 40 meters, but this time using a single wire pair, instead of two pairs of elements. Page 2 Assembly Fig. Another design by KB0ZZ is a little longer, but resonates on both 40m and 80m. Below is an image of the completed design with dimensions. Length 36m, with sealed balun, connector PL, max. The traps are now mounted at the end of the 80m dipole and extended with 13m wire. Oct 21, 2025 · A pair of 7. Find Kelemen Trap Dipole Antennas and get Free Shipping on Most Orders Over $99 at DX Engineering! Kelemen Trap Dipole Antennas are high-quality, heavy-duty pre-assembled wire antennas intended for permanent installations. 1 The antennas are assembled as shown per 5 days ago · An Improved Multiband Trap Dipole Antenna This improved multiband trap dipole introduces a new trap design and a change in trap location. Ideal for travel, backpacking, emergency, ARES/RACES, and SOTA operation. Handles 1500 Watts. Using coils like this for multiband dipole antennas is an idea that has been around for a while. Length, Kit","specifications": [ {"Bands":"80m/40m (3. Then began the tedious process of Jul 1, 2013 · Monday, July 1, 2013 A linearly-loaded, trap dipole for 80, 40, and 30m Since I have had my hex beam up, I have not been operating much below 20 meters. W3DZZ 80m/40m (34m/1kW) Trapped Dipole Antenna, Slightly shortened trap dipole for the classic bands 80 m and 40 m. A pair of tuned traps for making 80 / 40 meter band dipole or inverted V 250 watts version Ham Radio Pair of Antenna Traps 80/40m Low Swr. Then each half is connected to the 1:1 balun at bottom. So I am going to describe a single antenna for both bands that should fit into most gardens. The 80m band is similar, but the 40m and 20m band equates to a near three wavelengths overall. Mar 7, 2019 · Recently I've build a trap dipole for 20/40/80m bands. Improvise, adapt, and overcome right!? It isn't crazy if it works! Feb 29, 2024 · The company’s precision-crafted single-band full-size, single-band shortened, two-band shortened, and multi-band trap shortened rigid rotatable dipole HF antennas, ranging from 9. com. Now, when I say on the fence, I mean that the wire was held to the fence with thumbtacks. Total length of antenna in feet Open the dipole length calculator in a separate page. 3\""}, {"Connector":"SO-239 (UHF Female)"}],"category_id":28,"thumbnail":"/picts The 160/80/40 meter multiband fan dipole (lower right) mounted on the tower! CONSTRUCTION DETAILS: In the photo above, the 160 meter section is on top, 80 meters in middle and 40 on bottom. May 25, 2021 · The result is essentially the same as the conventional trap, with a compact 82 foot total wingspan that’s 33% shorter than a full-sized 80M dipole. On this page i describe my efforts to put up a trapped dipole usin In my neighborhood is having a dipole or other wide antenna for the low bands not feasible. I have come across many articles on trapped dipoles but while reading come across many issues regarding taking them down and trimming and reinstalling, etc. He also suggested that it is better to measure inductance with an LC meter, which I do not have! Moved PermanentlyThe document has moved here. 2kW (PEP)"}, {"Length":"85. Now you can operate the low bands on 80, 40, and 20 Meters with a true rotatable dipole thatÂ’ll blend in with the sky! Take advantage of the excellent propagation of the low bands during the low sunspot cycle. We would like to show you a description here but the site won’t allow us. W3DZZ Trap Dipole All joking aside you can do a lot better and my candidate for the task is the W3DZZ Trap Dipole. The center connector used is the W2DU Kelemen Wire Antennas offer a rugged reliability and space saving design for your antenna. 5m long for bringing in the resonance point on 15 and 10m, has allowed this dipole to be used on 80-40-20-15-10 with very good efficiency, low return loss, and no need for an internal/external tuner. Dual-Band Trap Dipole Antenna Operation Instructions Parts List Each model contains the following parts. The 1/4λ transformer ensures that the antenna is resonant in addition to a conventional W3DZZ on 14 MHz. A design by VK3JEG is only 66-ft. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Page 1: Parts List HF Multi-band Wire Dipole (Trap Dipole) Antennas Diamond W-Series W-8010 - 80m/40m/20m/15m/10m. Measuring 84ft in length, the Radiowavz Dual Band Dipole Antenna is engineered to provide optimal performance across the 80M and 40M bands, making it a versatile addition to your ham radio setup. A simple trap dipole for two frequencies. Each half of the trap dipole relates to a near or more than a full wave, such as on the 10m band, the trap dipole antenna equates to two wavelengths. A pair of these traps makes an antenna approx 96 ft in length. Mar 29, 2023 · 160/80/40 Fan Dipole1 - 20 of 22 1 2 We would like to show you a description here but the site won’t allow us. However if you don't have a beam they are still resonant on the pre WARC bands and will work using a ATU found in most modern rigs. The document provides a brief guide on building a compact dipole antenna appropriate for the 40, 80, and 160-meter amateur radio bands. That makes a very convenient tri-band Find many great new & used options and get the best deals for Antenna Trap pair for 80m (3. Many hams don’t have room for a full 160m dipole, so I started designing coil-loaded antennas, and discovered it was relatively easy to make a single element work on both 40m and 160m, with a length roughly that of an 80m dipole. The result would be a very high (impractical) impedance at 7 MHz - whereas the impedance of an 80 Short 85 foot long dual band 80/40 Meter dipole antenna is full-size on 40 Meters and has ultra-efficient end-loading on 80 Meters. May 31, 2021 · Building the W8NX Short Trap Dipole Filed in Antennas on May. After reading the analysis by W8JI, I still wanted to use coaxial traps, but I decided to use traps resonant off the operating frequency. Homepage van Maarten Ouwehand PG1NCreation date : 12/08/2007 @ 11:27 Last update : 29/10/2025 @ 13:20 Category : 80m Projects Page read 62231 times Jan 28, 2022 · DX Engineering is excited to be the exclusive North American retailer of high-performance, finely constructed Kelemen Trap Dipole Antennas from WiMo, Germany’s largest provider of amateur radio products. Perfect for field day or any time you need to put up a dipole in a hurry, it us Apr 30, 2021 · This story should begin with “when I was young” Well, about 20 years ago, when I lived in a building with a small roof and I couldn’t install log wire antennas, I decided to build a coax trap dipole for HF bands, based on a project reported in a well known italiank book named “Costruiamo le Antenne Filari” (let’s build wire antenna) by Nerio Neri I4NE and Rinaldo Briatta I1UW. Of course the aim here was to effectively reduce the size of the antenna without to greater reduction in radiation efficiency, sounds easy, well not quite. 3 ft. Abstract A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. So this new developped 'Super coax-trap' is new to me, it's always nice to find that almost everything is possible to improve, i also read some nice articles about doubble coax-traps but with only one layer in the ARRL book 'More wire antennas'. 5 across both bands. It worked well also on 20m with the use of an A. For SSB and CW operation on 80m, cut the antenna for SSB and make 2 small 'tails' that can be added with banana plugs at the end of both legs. This antenna covers 65 kHz of 160 meters, 75 kHz of 80 meters and the entire 40-meter band with SWRs under 2:1. I have searched the web and The Trans Tasman Low Bands Challenge is coming up on the contest calendar shortly and there is a possibility that I might be portable that weekend so that presented an additional challenge: I don’t have an efficient 160 metre antenna available when portable. Balun and traps are weatherproof and sealed with plastic. Here is the trap dipole for 40 and 80m: Trap circuit in the dipole This is how you make it: The capacitor fits in the tube Next you go in the field to adjust the length of the arms to make it resonant at the right frequencies: Field test, made a handful of QSOs on both bands The Multi-Band Trap Antenna A trap antenna uses L/C parallel tuned circuits to provide multiband dipole antenna that effectively switches between bands automatically. The bandwidth on 160m is a bit narrow due to the inductance of the trap, but with the transceivers's tuner I can use it on the full 160m band. Kelemen Trap Dipole Antennas 11500-K84M Antenna, Extra Short Wire Dipole with Balun, Assembled, 80/40 meters, 1kW, 72. The total length of the 40 Meter section of the antenna is calculated by the usual formula, listed on the left and right. This article is from a talk I gave about antenna traps. They feature special traps made with of PTFE (Teflon®) insulated coax for high Q and low losses, offer high performance multi-band operations—and are excellent shortened Dec 23, 2020 · First is the 80 meter dipole with just a 50-ohm coax feedline. My lot is not "really" condusive to a full sized 80m dipole, but, if necessary, I could compromise. Between the transformer and the trap is a short piece of cable, which acts as capacitance. The graph from the analyser shows 1:1 SWR on 80m when feed from a suitable balun. A trapped dipole relies on parallel tuned traps to ‘disconnect’ the additional wire when used on the specified band. 2 days ago · Short Dipole for 80 Meters May be of interest to anyone wishing to get on 80M (3. In this simple case, the trap is resonant at frequency F1, and the distance from the feedpoint to the trap is set for that frequency. A trap dipole, in it's simplest form, might be a two band antenna for say, 80/40 Meters, as in Fig. The antenna features double-coaxial-cable-wound traps having lower reactance and a higher quality factor (Q) than earlier coax-cable traps by W8NX Rotary dipole for 12/17 meters 80/75 meter cage dipole Each cage dipole is hand made with quality and care, using materials that will take the abuse of even the most harsh enviroment. 65MHz) for 160/80m trap dipole. 8 feet, are built with quality materials to withstand tough environments. I spotted a 20 meter trap on a multiband antenna in my junk pile that looked like it might have enough inductance. Please confirm all parts are accounted for before assembly. As with all Mosley antennas, pieces are all pre-drilled and color coded, which makes assembly Find great deals on SOTABEAMS for HF Antenna Traps Kit (pair). Extremely low weight with high tensile strength due to the use of highly flexible steel wire with plastic sheathing. a halfwave transformer for the 80m band, and 2 pieces of wire 1. This construction method makes for simple, lightweight, It is also important to recognize that the traps are used in low-current portions of the antenna, minimizing 12R trap losses. 5 MHz (80 meter) dipole, the 7 MHz current would be at a minimum (null) at the center feed point of the 80-meter dipole. A trap dipole antenna is designed to operate on multiple frequency bands by incorporating traps that act as high-impedance elements at specific frequencies. Length, DPK-8040-M, Each Part Number: KEL-11500-K84M Not Yet Reviewed Estimated Ship Date: Tomorrow Free Shipping Documentation On Sale Get the best deals for 80m Trap Dipole at eBay. I have previously made other trapped dipoles using the standard coax-trap design. The size of the antenna makes a Half wave length on 80 meters, and with the traps a half wave on 40m with a SWR (standing wave ratio) of 1:1-1. Considering an 80m dipole is typically approximately 126 feet, you can begin to see the size Find Kelemen Trap Dipole Antennas 80 meters Wire Antenna Band and get Free Shipping on Most Orders Over $99 at DX Engineering! Kelemen Trap Dipole Antennas are high-quality, heavy-duty pre-assembled wire antennas intended for permanent installations. This means that if we try to feed 7 MHz to 3. Traps serve as inductive loading below their resonant frequencies, so the physical length of a trap dipole may be shorter than a resonant wire on the antenna’s lowest band. The dipole is fed with good quality RG-8X using 16 Fair-Rite #43 1/2" ferrite beads as a current balun. Not even a dipole for 40 meters will fit behind the house. Feb 1, 2015 · So, an 80/160m trapped dipole will be an 80m dipole, with traps at the end of that, with additional wire to resonate it at 160m. Double bazooka coaxial dipole antenna From WH2T Dr Ace's Double Bazooka Coaxial Dipole Roofspace Antennas How to build a roofspace antennas and get them to work. Alpha Delta has adopted this design for its 80M/40M antenna and two of its sloper models. 2 ft. power load 1000W SSB/CW (300W for 40m/7MHz). I’ve tried endfed halfwaves, random wires and fan dipoles and for Free Shipping - Diamond Antenna W8010 Wire Dipole Antennas with qualifying orders of $99. {"id":365,"model":"W735","title":"W735 Long Wire Dipole Antenna","description":"Antenna, Wire, Trap Dipole, 80m/40m, 1. Now this trap dipole is resonant in the middle of the 160m and 80m band. com: Alpha Delta DX-CC DXCC Original 80-10 Meter Dipole Antenna - Inverted V MountAlpha Delta DX-CC DXCC Original 80-10 Meter Dipole Antenna - Inverted V Mount MFJ 80/40/20 Meter Rotatable Dipole A full legal limit efficient 80, 40, and 20-meter antenna that is shorter than a 20-meter dipole. Dec 19, 2024 · VU2MSA who was also there during the discussion on band shared similar experience with a trap dipole for 80m heating up in the middle of a QSO on higher power. It explains the materials, building processes, and tuning methods required to provide best performance while preserving space. On each half of the antenna, all dipoles halfs are connected together at a common point on each side of the center insulator. I am considering using traps on the existing dipole. 7-strand, #14 gauge hard copper antenna W8NX details a new coax trap design used in two multiband antennas; one covering 80, 40, 20, 15, and 10 meters, and the other covering 80, 40, 17, and 12 meters. 5MHz) that have limited space available. design a 40 m Dipole and then load the Dipole to make the antenna resonant on 80 m. The other thing is that the Low Bands Challenge is only for 40, 80 and 160 metres. The band conditions have been terrible anyway. The second and third curves show the SWR across the 80 meter Band with the 75-ohm section added, and the 50-ohm section cut to 1/2 wavelength at 3750 kHz. I strung it between the tower and some trees in the back yard. It is coated with a small amount of silicon lubricant to produce a ducks-back effect and prevent rain water from forming a continuous film on its surface. May 21, 2021 · The coax trap will also shorten the length of the wire antenna, making it perfect for the smaller garden. 34 m. What will you need? Bandwidth is very broad on 20 and 40m, for 80m at least 100 kHz for SWR <1. Remark regarding the wire diameter: I observed that, using a wire of dia 1. Oct 17, 2013 · Amazon. 5. It contains measurements of traps, performance of trap antennas using models of traps, and ideas on how to make trap antennas more efficient. Simalar results on 40m. The4 A doublet antenna (dipole), cut for 80 meters, will not work on 40 meters because 7 MHz is an even harmonic multiple of 3. 160/80/40 Meters - 55-Foot Vertical From K5OE VE3GK's Homebrew Site -- 80M Rotating 2 element Quad Verkürzte Antennen -- Short Dipoles and Verticals for 160m & 80m -- From DJ9RB Wire Antenna for 75 and 80 Meters -- From Ross W1HBQ 40M/80M Trap Dipole -- From QRZ 80/40 Meter Vertical From EI7BA Automatic band switching by means of high-impedance resonant trap circuits. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. Douglas K. This has the advantage of not needing any kind of Antenna Matching unit for 80m and 40m and is an ideal companion for those with beams for 20m-10m. 1MHz traps to make an 80/40m trap dipole as a descendant of the W3DZZ trap dipole. I have made traps in the past for 40m/80m dipoles Feb 8, 2019 · After all, an 80m dipole is going to be around 40m (132Ft) long and modern postage stamp sized gardens just can’t accommodate this. 31, 2021 For the past five years, I have been operating the lower bands (3 The result was a dipole for 80 Metres that has a length around half that of a conventional dipole with a transmission loss of less than 3dB (<1/2 an S point). Sep 5, 2014 · Shortened, loaded dipole. e. Three Band Dipole for 80m 40m 20m [1] Trap-dipole advantages include reduced size, instantaneous band-switching and a standard dipole radiation pattern. An Improved Multiband Trap Dipole Antenna QST July 1996, pp. Extremely low weight with high tensile strength due to use of highly flexible steel wire with plastic sheathing. The paper also discusses Reviews For: KELEMEN HF DIPOLE Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. It covers 6 bands, 10-15-20-30-40-80m. It features a sealed balun and a PL connector, allowing a maximum power load of 1000 W SSB/CW (300 W at 40m). All rotatable dipoles listed below can be expanded to beams down the road with conversion kits. drainpipe, and RG58 A/U coax - 15,55 windings, all counting is done by the program COAX-TRAPS. T. 8 MHz. I made my version of this antenna using 3mm multi Insulators and center hooks are included with each preassembled Kelemen Dipole antenna. 065 The 3. Made in Dorset UK. The trap construction as well has me confused. Shop Wire Antennas at DX Engineering. In this video I show and explain how to build a trap for the 40 metre band this can be This trap is resonant on 3. The DP-2BDQ is a 40 or 80 Meter dipole antenna with 101 feet maximum length of dipole. 8-MHz trap is shown without its protective electrical-tape wrap to show the details of trap construction. It's roughly 10m high. So what to do? My requirements Should fit in my lot (in Reviews For: Pacific Antenna Dual Band 20m and 40m Trap Dipole Category: Antennas: HF Portable (not mobile) eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Shop HF and VHF Portable Antennas and Accessories for Amateur Radio/Ham Radio with confidence. I thought about W8NX details a new coax trap design used in two multiband antennas; one covering 80, 40, 20, 15, and 10 meters, and the other covering 80, 40, 17, and 12 meters. 1. Details Trap dipole for 80m, 40m, 20m, 15m and 10m. W-8010 W-735 Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe. As with all trap dipoles, this one has less-than-ideal bandwidth due to the load- ing effect of the traps. Article is fully in italian, as it was published on ARI RadioRivista, but is plenty of self explaining pictures that will guide you on homebrewing this trapped dipole antenna for the lower amateur radio bands. Span approx. The antenna has a Feb 16, 2021 · Least served by my other antennas are the 40m and 80m bands, so I included a coil “trap” for 40m in the design options options for this big inverted L. Mosley rotatable Dipoles are the perfect answer for those limited with space, but want the flexibilty to expand down the road. Finally free of restrictive covenants and neighbors who failed to see the beauty in amateur radio antennas, I dreamed of building, for the first Dec 11, 2024 · The circuit presents at high impedance at the resonant frequency. 111 - Helix Antenna 112 - Novice Vertical Antenna for 80m, 40m, 15m, 10m 113 - Stub-Loaded Shortened Dipole for 80m 114 - Six-Band Wire-Stub Trap Antenna for 40m-10m 115 - Multiband Half-Wave Delta-Loop Antenna 116 - Hybrid Vee for 20m, 17m 117 - Six-Shooter Array Antenna, Gain=7. Feb 21, 2025 · The Pacific Antenna Dual Band Trap Dipole kit provides a lightweight, portable trap dipole. 32-34 You need this - traps with lower loss, higher Q, increased power-handling capability and four-band coverage. This particular trap dipole is constructed for 80m, 40m, 20m, 15m, and 10m bands and has a total length of 36m. But doing so requires me to make for each dipole side what’s known as a trap, which is nothing more than a tank circuit (capacitor and inductor in Oct 29, 2025 · 160 meter full wave loop antenna The antenna is a 10 - 160 meter horizontal loop fed with 450 ohm ladder line all the way into the ham shack to an Palstar AT1500BAL balanced line antenna tuner Trapped dipole for 40-80-160 meters Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe. 80/40m Loaded Dipole Most of the time Amateurs build loaded 80 m Dipoles based on a 40 m Dipole, i. Jun 20, 2009 · Hello All, I have an 80m dipole that I wish to use on 160m as well. The best performing 80M Dipole - The JK801 is a motorized inductor coil loaded as well as end capactively loaded rotatable dipole, with a small footprint, giving great full band performance on 80M. Designed for horizontal or inverted "V" rated at legal power. This antenna proves no exception to that rule. Basically, the loading coil is operating as a trap. I put it on my MFJ-259b meter and it had 55 uH at 2 MHz. I have been asked why I haven't installed this antenna at my QTH. This is typically achieved by using traps (coils and capacitors that create resonant circuits to isolate sections of the antenna) or by a fan dipole configuration (multiple dipoles connected in parallel) to allow a single antenna to cover multiple frequencies. A three-band dipole antenna designed to operate on the 80m, 40m, and 20m amateur radio bands. I have searched the web and have not found any 80m/160m trap dipoles. Handles power up to 100W of RF. Explains how to build an effective antenna in your roof. Use as a dipole, inverted V or upright V antenna configuration. Slightly shortened trap dipole for the classic bands 80 m and 40 m. This is the price paid for multiband coverage and physical short- ening. 5 to 50. Jun 9, 2021 · Technical information for ham radio, by KY4DSTable of Contents Trap dipole basics Design overview Do the math Determine inductive reactance Another example: 10m/20m trapped and loaded dipole Repeat for additional bands Calculator tool Trap construction Assembly and tuning I have 50 feet of room for an antenna at my QTH. Solderless , crimped construction. The antenna is completely mounted and equipped with a socket SO239 on the balun for the Model DX-CC multi-band 80, 40, 20, 15 and 10 meter dipole • NO-TRAP DESIGN • STAINLESS STEEL • HARDWARE • FULLY ASSEMBLED • SEVERE WEATHER RATED • ALPHA DELTA MANUFACTURED ANTENNAS NOW MADE IN OUR IS0-9001 CERTIFIED PRODUCTION FACILITY. Adding 80m operation extends the 1/4 wave length to about 33 feet (or 66 feet for a full size 1⁄2 wave “trap” dipole). long, about the size of a 40m dipole. Has anyone added traps to their 80m dipole to make it usable on 160m? Or could anyone point me in the right direction towards homebrewing traps to suit. m. Enter a length between 1 and 500 feet Distance from center of antenna to the center of the coil in feet (Must be less than half the total antenna length given above) Enter a distance between 0 and 250 feet that is less than half the total antenna length Diameter of the conductor in inches (14 gauge is . The 40m Lite Trap has finally become practical due to the design using relatively thin wall polyethylene pipe, winding with RG174 coax and covering with adhesive polyolefin heatshrink. Yes, I have a trapped V that I can use on 80, 40 and From the center insulator, the wire is 63 feet and 8 inches to the trap and 42 feet and 1 inch after the trap to the end insulator. Hello All, I have an 80m dipole that I wish to use on 160m as well. For installation, use lengths of non-conductive antenna rope for the center support and for each end of the dipole. They feature special traps made with of PTFE (Teflon®) insulated coax for high Q and low losses, offer high performance multi-band operations Been reading up on my options for building a dual band 40m / 80m antenna. My homemade TRAP-dipole for 40/80 meter need a extension so I can have the 160 meter band I started to make the TRAP's: I use 50 m. 5 MHz. Finished the trap's I made some Measuring. Inserting traps into a dipole element make it appear to be different lengths on two different frequencies. Onewaytocausethe160 meterimpedancestobeaboutthesameistoformth arightangleasshownbelow. Another option is a shortened dipole using loading coils. This is multi-band resonant antenna The performance characteristics is similar to a normal dipole and is driven through a 50 Ohm coaxial cable and features low SWR on all bands. Smith, W7ZZ Email: w7zz@arrl. Noticethatthe80meterfeedpointimpedanceinth muchlowerthan200ohms. 5dB 118 - Multiband Ground-Plane Antenna for 10m, 15m, 20m Feb 12, 2010 · I decided what I needed was a trap dipole. Tiny Antenna Trap Kit (6m - 80m) A complete kit for an QRP+ antenna trap (build your own multi-band dipole, vertical or EFHW) Designed by HB9ZHK in Switzerland Wishlist Tweet Share Pin One of the first HF antennas I put up at my new house, other than my small transmitting loop antenna, was an 80m dipole installed on my privacy fence. HF Multi-band Wire Dipole (Trap Dipole) Antennas Diamond W-Series W-8010 - 80m/40m/20m/15m/10m. Still, it has been a goal of mine since then to get up a antenna for the low bands that does not require a tuner. This is by far not wide enough for full size dipoles for 80 or 160 meters. To 80m, the traps look like high impedances, effectively disconnecting the extra wire for 160m. U (antenna tuning unit). vrwo cfnzcj amt zsk bxys bap vizox hmaqgx guge uzw enyd tkpng glkpcel ndwn pfboukz