A coaxial trap antenna is a popular antenna design for amateur radio enthusiasts with limited space who are interested in obtaining increased bandwidth. The table above illustrates the trap dipole construction details. The best ones I made were fan. The trap can consist of a coil and a separate HV-capacitor. Do not confuse coils and "traps". 1 RF transformer. Its gusting 20mph. We are available during the business hours below: Monday-Friday: 9:00 AM to 7:00 PM CST. Accepts mast diameters from 1. I dug out a model of a 40/20 meter trapped dipole using traps using RG-58 I did some time ago, and found the trap voltage to be 568 volts. Traps are made of coax cable using VE6YP coax trap program. His filter attenuates more than 30dB in the 88-108 MHz range with an insertion loss of less than 1dB up to 1. 308/f for metric): Switch to: divided by Freq. Can be multiband with traps. 135 - Collinear Vertical Antenna 6dB-Gain for 2m, 1. GM0ONX 6 Band Inverted L Antenna MK3. WHY THE MULTIBAND HF FAN DIPOLE IS THE RIGHT CHOICE, IF YOU CAN ONLY PUT UP ONE ANTENNA. The Antenna in Place up 35′ The pole in the foreground supports my 30M full wave loop and the end of the 80M/40M Trap dipole. Mathison (77) and then. You will hear the quarter-wave antenna referred to as a “Marconi antenna. For example a 2-band-dipole needs one trap in each half of the antenna. If you’re having trouble receiving one or two channels even though you’re close to your local broadcast towers, it may be because your antenna is not designed to pick up VHF frequencies. Power can be fed to the wire on practically any frequency by one or the other of the methods shown i n Fig 1. Construction was easy and using my antenna analyser got the traps resonant on 14. Homebew Coax Traps Traps can be one way round multiband coverage without the need of an atu. Cebik-Antenna-Options. Recently, members of Sacramento County ARES got together to build a 20/40 meter trap dipole antenna with a homemade balun. The Yard Store has a lot of surplus aircraft aluminum from Boeing, Spirit, Hawker/Beach, Cessna, and Bombardier. The joy of this antenna is that I will never have to worry about traps failing. Lower frequencies will pass the trap effectively making the antenna bigger. JK401 Rotatable Dipole for 40M. Ehrenfried – G8JNJ I’ve recently been looking at designs for an efficient antenna that would fit in a loft. Online and downloadable Dipole, Inverted V and Ground Plane Calculators. Double Bazooka NVIS Antenna Calculator. This makes it obvious to use a thick copper cable which has a low resistance after all. Total trap loss = 0. Look at the comparative gain and F/B curves for the 20 meters 3-element reference antenna (from Part 1) and the trap tri-bander on 20. September 2014. The resonant frequency is best checked with a one or two turn loop of thin wire around the centre of the trap with a 6-inch long pair of wires to an antenna analyzer switched to its impedance range. HF verticals are versatile, and can deliver both multiband and monoband performance. Overall length is 40 ft. Assistant Technical Editor. The measurements below are for building a simple Dipole Antenna. The Coaxial Trap Confusion (mostly resolved?) Background Antenna traps need an inductor and a capacitor in a parallel circuit to effectively cut off the end of the antenna for some higher frequency giving dual band capability. The trap values, obtained from the Coaxial Trap Calculator were used for entry of the trap parameters for EZNEC. The Antenna in Place up 35′ The pole in the foreground supports my 30M full wave loop and the end of the 80M/40M Trap dipole. Amateur Radio, Antenna Theory, Homebrew Antennas, Hidden and Stealth Antennas, CC&R's, and Antenna restriction. The Antenna in Place up 35′ The pole in the foreground supports my 30M full wave loop and the end of the 80M/40M Trap dipole. 10mhz, other bands would also be fine with the use of an antenna tuner. No resonant traps. The antenna was required to operate over the frequency range of 220 MHz to 225 MHz specified in the standard. They may look alike but they do not have the same electrical characteristics. The following weekend I began assembling the antenna mast in the garage. LC Tuned Circuit Calculator Enter any two values of the first three (C, L, Fo) to calculate the third one and Characteristic Impedance Zo. Dipole antennas are some of the simplest antennas to build in addition to being very efficient and solid performers. Even with the 20 segment limit, the demo program does a very respectable job analyzing a two-element quad, two- and four-element phased vertical arrays, simple Yagi, W8JK, and many other antennas -- including ones you create from scratch. Magnetic Loop Antennas for The Radio Operator with Limited Space pt. At the lower frequency, the entire element (including the remaining inductance due to the trap) is close to half-wave resonance, implementing a different Yagi–Uda antenna. Dipole Antenna Calculator. As you may already know, no two antenna installations are alike or identical in many ways, even when using identical antennas and each the same height above ground. 2(a): You can see that when erected in a straight line the dipole is quite directional. Only 0 in stock. This calculator was adapted from the Coil-Shortened Dipole Antenna Calculator. Use as a dipole, inverted V or upright V antenna configuration. It has no way of knowing ALL of the variables in your installation. Also covers 30-17 & 12 meters with an antenna tuner. Post by HomerBB » 12 Jan 2013, 18:40 You guys know more about this than I do, but I can't help but thinking that the same wire in the diagram could be lengthened by some small amounts simply by pulling it off a direct straight line and end up with something that looks like a part of a hexagon. Inverted Vee, approximate angle from horizontal. His filter attenuates more than 30dB in the 88-108 MHz range with an insertion loss of less than 1dB up to 1. f That's where the 16. Note that the calculator is for a straight line, flat top dipole, sufficiently placed in "free space". Whether you're looking for mobile, base, or tower antennas, we've got you covered! You'll also find antenna rotors, coax cables, mounts and antenna parts here. There was a benefit to the losses of the tree and mast. The correct lengths for the various models will be displayed in the chart. By Guy Atkins. Another reason why you might use a trapped antenna is that because the inductor in the trap operates as a loading coil it allows the antenna to be shorter end-to-end than a full sized dipole. The All Band Dipole Doublet | The NerdCave - August 14, 2013 […] The vertical antenna was working great on 20-17-15 and with the low sunspot peak I wasn’t too worried about 12m and 10m. In the last few months, I got into antennas a little bit deeper. Antenna Trap Calculator. The horizontal center-fed wire forms the antenna proper, which accounts for the radiation of transmitted energy and the reception of incoming energy. All you need to do is enter the desired resonant (center) frequency in the form below, then click "Calculate". Bumpers metal (used) Wood finished tile. A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. The 40 meter traps and the rest of the antenna do not exist to 20 meter RF. Some traps on commercial antennas make use of the inductive or capacitive properties of the trap as part of the overall antenna design. The Antenna Farm : Tram - VHF & UHF Mobile Radios Radio Accessories VHF & UHF Hand Held Radios Antennas Mobile Antenna Mounts SWR/Power Meters Adapters Coaxial Cable Two Way Accessories Antenna Accessories DC Power Supplies Coax Cable Accessories Connectors Aviation Radios Repeater Systems Towers & Accessories Duplexers Diplexers & Triplexers VHF & UHF Base Stations Base Antenna Mounting. The features are not real different from loop to loop. 64 - Dual-Band Sloper Antenna. The trap showed an impedance of 5175 - j22155 ohms, effectively terminating the antenna. Assistant Technical Editor. The 500mA 5V. 6 First Fresnel Radius Zone Calculator, VSWR Calculator, Coaxial Cable Loss. Recently, members of Sacramento County ARES got together to build a 20/40 meter trap dipole antenna with a homemade balun. Remember to scape off the enamel coating on the helical antenna wire and tin all wires. TV Antennas. This makes it obvious to use a thick copper cable which has a low resistance after all. My question: Is there any difference if the shorted end is pointing to the center or to the tip of dipole. WX: 2019 WX was for the most part much better than 2018’s trip to the same location. The only bad thing about Portal is that you can't play it everywhere. During testing, using an ALD ATU, the antenna tuned in to 40m, 20m, 17m, 15m,12M and 10m!. At the right-hand side of the trap, the inner conductor is separated from the braid. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] Therefore, it is best that the trap be high resistance in the center of the 60 meter band. Cebik-Antenna-Options. The Short Dipole For Multi-Band Use. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. I was looking for something to cover 30-40-80 (my 718 doesn’t do 60m). Listed under the Antennas/Antenna Calculators category that is about Antenna design calculators. I am sharing here the thought process and experimentation that I went through to arrive at the solution that best fits my needs. The Antenna Farm : Tram - VHF & UHF Mobile Radios Radio Accessories VHF & UHF Hand Held Radios Antennas Mobile Antenna Mounts SWR/Power Meters Adapters Coaxial Cable Two Way Accessories Antenna Accessories DC Power Supplies Coax Cable Accessories Connectors Aviation Radios Repeater Systems Towers & Accessories Duplexers Diplexers & Triplexers VHF & UHF Base Stations Base Antenna Mounting. These loops are made to enhance radio reception in the broadcast, or medium wave (MW) band range. Adams article goes through and explains the design of a FM trap and how to use freeware software to aide in the calculations. us -- WIDE range of antennas from military , amateur, and mobile to GPS, WLAN/Wi-Fi/WiMax and TV! Rick Adams -- Makers of cubical quad spiders for CB and ham radio use Myers Engineering -- Providers of original and custom antenna design, antenna engineering, and antenna development and manufacturing services. Dipole antennas are some of the simplest antennas to build in addition to being very efficient and solid performers. Order today, ships today. 134 - Taylor Vee Antenna for 20m. Directivity affects SWR accuracy -- poor directivity means that "forward" power is getting into the "reflected" power port and corrupting the reading. QST August 1994, pp. This program calculates the input impedance of a trap as seen by the 1/4-wave length of antenna wire which precedes it and when terminated by the wire open-circuit length which follows it. The FCC restricts the total length of the antenna, feed line, and ground lead to 3 meters (118 inches). Vertical Antennas Mono band ¼ wavelength with ¼ wave counter poise or radials or Vertical Dipole that does not require radials. the coil length equals the coil diameter. 1 shows the basic elements of the system. Antenna Trap Calculator Link: http://vwlowen. and Energy Ultra Calculator For a calculator that computes sound waves, click here. 65 - Inverted-V Beam Antenna for 30m. This antenna is built using stainless steel hardware, all nuts are self-locking, and all holes are sealed with RTV sealant. My tests prove it more efficient than a Balun. A dipole antenna using antenna traps is desired which is to be used to transmit a 140 MHz signal and a 90 MHz signal. The Lure of the Ladder Line -- used with permission from QST and the American Radio Relay League,Inc. zip Yagi Design prg for 144 MHz and up - WA2TIF ariel15. just as i have done before with the low power version. His filter attenuates more than 30dB in the 88-108 MHz range with an insertion loss of less than 1dB up to 1. A Yagi-Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of metal rods. May 12, 2017 Julian OH8STN Ham Radio 0. End-fed wire antennas. The antenna below (green) is calculated on basis of the correct equivalent circuit (L // ¼ · C). 850-329-8783 6 Band hexagonal beam antenna covering 6, 10, 12, 15, 17, and 20 meter bands shipped to your door for only $600($540 + $60 shipping) The NA4RR Hexagonal Beam (commonly referred to as the hex beam) is a popular antenna based on the G3TXQ design. To be on the safe side, keep your power around a 100 watts or less. Take the guess out of shipping with our Shipping Calculator and Shopping Cart solutions from AuctionInc. 10mhz and 20. Amateur Wire Antennas : Want to work DX with little space. Bootstrap coax traps for antennas Owen Duffy Abstract The article is an analysis of an antenna trap where a coil is formed of a length of coax cable, the outer conductor of one coax end is tied to the inner conductor of the other coax end, and the remaining connections (outer at one end and inner at the other) form the terminals for the trap. From David, N5IZU From David, N5IZU Portable All Band Antenna -- "IK-STIC" -- a multi-band vertical dipole antenna which can be used in the field for quick set-up and quick band change. As a matter of fact, right now I have a ladder line fed dipole up 130 feet with a perfectly vertical feedline down to a tuner as a "spare" or multi-use antenna. Please note that this antenna will NOT out-perform a beam antenna at 100ft on the HF bands or a 260 ft long wire on the LF bands - It works about as well as a 7m long vertical antenna can do ! I find this antenna particularly useful for HF beacon monitoring using Faros software, WSPR personal beaconing or HF ALE operation using PC ALE (most of. Please, do allow me to tackle some anticipated criticism. Traps Now that we have the 35pf trap capacitors, it is time to build the traps. Open the dipole length calculator in a separate page. > For trap after trap with various L/C combinations, some with air core, some with toroid, but all tuned between 13. Available in 20+40M and 17+30M versions Approximately 30% shorter than a full size dipole Weighs approximately 4 ounces. W2VS traps are available for 80 meters and up in two versions. Only 4 parameters need to be known: the design operating frequency, the coil form diameter, the coax diameter and the coax capacitance per foot. For an good efficacity and directivity on radio spectrum it's necessary to use an YAGI antenna. The trap showed an impedance of 5175 - j22155 ohms, effectively terminating the antenna. com in 2 categories. By matching the antenna through a L/C impedance matching L network, the SWR could be lowered to less than 1. 2019 Field Day was once again a solo effort vacation camping at Carolina Beach. 5MHz) therefore also resonant on second, third and fourth harmonics, etc. These radial wires will provide the needed electrons to move up and down the antenna, but they do not help hold the signal down along the surface of the earth. A trap is a parallel resonant circuit network that can perform either of two functions in an antenna system, depending on whether the traps are resonant at the operating frequency. If the wire is made Chapter 7 Multiband Antennas Fig 1—A t A, a random-length wire driven directly from the pi-network output of a transmitter. I dug out a model of a 40/20 meter trapped dipole using traps using RG-58 I did some time ago, and found the trap voltage to be 568 volts. A high pass filter prevents frequencies below its cut-off frequency from passing and lets through signals above it. Basic antenna theory has not changed a bit from that time, other than having better computer modeling. By Guy Atkins. Back to Ham-Radio. The antenna was built as follows: Following the article, I am using 1" (34 mm OD) PVC pipe as the support structure for the antenna. The antenna tuning range is restricted to 1500 kHz - 1700 kHz to make it simpler to construct. The measurements below are for building a simple Dipole Antenna. W4RNL Antenna Theory. DIY Shortened Vertical Antenna Introduction. T his article describes a practical approach to the design and build of a sleeve dipole antenna mandated by a custom EMC standard. Available in 20+40M and 17+30M versions Approximately 30% shorter than a full size dipole Weighs approximately 4 ounces. 8-MHz trap is shown without its protective electrical-tape wrap to show the details of trap construction. The tuning process is the same as for the 40/80 dipole, excpet the 20 m wires are trimmed first to an SWR of 1. \$\endgroup\$ – Connor Wolf Feb 3 '13 at 0:55 1 \$\begingroup\$ @ConnorWolf The GSM module connects to the PCB through the connector (on the bottom side) located just below the antenna. Assistant Technical Editor. But having just come through a cycle of building. W2AU Baluns are transformer designs with ferrite cores to provide 95% minimum coupling efficiency. You will notice little or no difference in signal performance for FEED POINT SWRs of up to 4:1. It is often measured in dBi, dB above an isotropic (non-directional) radiator. and Energy Ultra Calculator For a calculator that computes sound waves, click here. Can be operated on non-optimum bands with an external tuner. The second idea opens the door to adapting many possible antennas to omnidirectional work. The 40 meter dipole was loaded with some coils so that I could fit it in the attic. The idea is to build the antenna of zip-cord type line 140ohm vf 0. Trap antenna works: TRAP is like an electronic switch. Design of a two-band antenna loaded with a coil + capacitor parallel tuned circuit. Take the guess out of shipping with our Shipping Calculator and Shopping Cart solutions from AuctionInc. Full size dipole for 20 meters @ 35 feet long. A V-Dipole is simply a dipole antenna spread at 120 degrees, placed horizontal to the ground, and typically oriented in a North-South direction for receiving weather satellites. To achieve this gain the antenna must be constructed of the right materials so that losses are reduced to the absolute. 2 and 3 show a trap made for use Fig. This is not necessarily a serious problem, so this time we will use an open stub. Note: The demo program doesn't include the several additional features of EZNEC+. 7 MHz RG-58 TRAP. Most dipole antennas are a half wavelength long, and accordingly it is often necessary to calculate the physical. The Dipole vs Indoor Magnetic Loop Antenna. earlier trap I built using a standard doorknob capacitor. just as i have done before with the low power version. Consider the TiVo Edge for Antenna, a system with four antenna tuners and 300 hours of recording on a 2TB drive for $349. Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole in a collinear design. Solid Signal, connecting you to your signal solutions. With our free freight class calculator we can quickly determine your class based on your pallets weight and density through volume calculations. All the loops described here were designed and built by myself. A 40 meter trap is located at the top of a quarter wave 40 meter vertical. Directivity affects SWR accuracy -- poor directivity means that "forward" power is getting into the "reflected" power port and corrupting the reading. An antenna inductance of about 135 uH would allow for a better turns ratio (1 : 5, as for the medium-wave transformer) with the same secondary inductance. Reduce precipitation static and lower background noise with the Tram Amateur Dual-Band Antenna. Unlike to others, this notch is then matched to the source/load at the passband frequency. Attic antennas •Many types of antenna can be mounted in the attic IF you don’t have Radiant Barrier (Tech Shield). Diamond CP610 6 Meter & 10 Meter Ham Radio Base Antenna 500 watts SSB, 200 watts. LC Filter Calculator – How LC filters work The LC filter , also called the LC filtering element , designates a circuit with an inductance L and a capacitance C in electrical engineering. These powerful TV antenna signal amplifiers are designed to overcome signal loss related to long cable runs and splitters. Another reason why you might use a trapped antenna is that because the inductor in the trap operates as a loading coil it allows the antenna to be shorter end-to-end than a full sized dipole. Dual Band VHF/UHF Slim Jim Antenna. RF Harmonic Measurement setup. Calculator Index. I designed this new automatic drop-in goshawk trap that I really like. 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. Using this software, you can design and build your own Yagi antenna. But be warned – end-fed antennas can be noisier and also cause more EMC/interference problems. Previous articles have provided much information on this family of anten-nas. trap dipole for 10-80 Antennas by model J-pole. Yagi beam antennas are designed to cover a very narrow frequency range, typically 2%. DATE REVIEWED DATE ADDED. My question: Is there any difference if the shorted end is pointing to the center or to the tip of dipole. equivalent circuit. Quick SWR Calculator for Vertical and Dipole Ham Radio Antennas Here’s a really simple way of double checking how to much to trim your antenna elements. This vertical antenna has no lossy traps,coils or stubs to burn out ,fill up with water and detune. The larger the wire, the wider the bandwidth. The ARRL Antenna Book. Traps simply act like a switch electrically cutting off the rest of theRead More. The trap physical design will be substantially influenced by the design of the antenna using the trap. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] A coaxial cable trap is a parallel resonant circuit that is usually inserted in an antenna element to enable multiband operation. Below are some photos of an experimental setup for 20m that helped me understand what is going on with end fed half wavelength antennas. The success of the three previous editions of Practical Antenna Handbook has been most gratifying. I am sharing here the thought process and experimentation that I went through to arrive at the solution that best fits my needs. 15 at 15:31:11 | Experimenting with trap antennas, selecting the resonant frequency for the traps, notes on capacitors and coils. Checking Coaxial Cable Traps Using the MFJ Grid Dip Meter Adapter - Duration: 4:42. Antenna Calculators - Antenna Plans - Antenna Designs - Construction - Antenna How To - Videos - Antenna Manufacturers Whip Calculator Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 M Twin Lead 40M Dipole This Old Dipole 40M Dipole Carolina Windom New Carolina Windom. The first idea limits us to a single antenna. Coaxial_Stub_Filter_Designer. The hexagonal beam (or known by many as the hex beam) has become a wildly popular antenna. It's a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 meter amateur radio bands" See All Details : The 10/15/20 Meter Trap Vertical Antenna This antenna project came out very nice. Covers 150 - 162 MHz. Mouse-over any image to see it larger! Let's work through the design of a simple-to-construct low-cost antenna 'trap' - like the one pictured above - for the 40 metre band, i. Adding a Director to a ¼ wave 40M HF vertical antenna. A soldier in the field did not have time or calculators and had to get the job done. The inductor calculator presented on this page is unique in that it employs the n = 0 sheath helix waveguide mode to determine the inductance of a coil, irrespective of. About Antenna Trap Calculator The resource is currently listed in dxzone. 5 across both bands. Traps for different bands can be combined onto one dipole to create a single antenna tuned for maximum gain on all your favorite bands, from 160 to 10. From David, N5IZU From David, N5IZU Portable All Band Antenna -- "IK-STIC" -- a multi-band vertical dipole antenna which can be used in the field for quick set-up and quick band change. Diversity reception "diversity" receiving using stereo along with some sound file examples. To be on the safe side, keep your power around a 100 watts or less. An additional requirement of having an input impedance close to 50 Ω was imposed to ensure good antenna efficiency when used with 50 Ω characteristic. The gain of the full-sized 3-element yagi is pretty flat across the band. Coaxial-cable antenna traps are cons tructed by winding coaxial-cable on. Experimenting With Trap Dipoles- Part Numero Uno By w4kaz, created on 2019. It is a directional antenna that provides great performance and does not require a full scale, expensive tower. Energy Analysis - Feedlines. The deterimened classes range from 50-500, lower classes are higher density and normally cost less than a low density higher class shipment. With our free freight class calculator we can quickly determine your class based on your pallets weight and density through volume calculations. Download the 80-10m EFHW antenna guide Update 29/1/17: I've updated the guide to look at replacing the coil with a 7MHz trap and also putting the antenna up as an inverted V. The amp is only +3. (13-AWG) wire wound on an Amidon T-400-3 Toroid. Slowly vary the frequency and search for a very sharp peak in impedance magnitude to find the resonant frequency. I had the radios but needed an antenna that would work on most amateur bands and others if needed. By John Portune W6NBC. 6 First Fresnel Radius Zone Calculator, VSWR Calculator, Coaxial Cable Loss. As annoying as it is, it doesn't look like it's going to stop anytime soon. 2 db loss per trap versus and full length antenna radiator. Welcome of my homemade loop antenna or loop aerial pages. com in 2 categories. A dipole antenna using antenna traps is desired which is to be used to transmit a 140 MHz signal and a 90 MHz signal. Of course it may be clear that the best antenna litz can be used with a low resistance. Wire diameter: In millimetres : Frequency of operation: In MHz : This is a World Wide Web front end for a public domain program written by W4/VP9KF using PHP. Research has been done in various installation environments and antenna configurations, including some against competitor's products, to evalute for propagation effectiveness. Full size dipole for 60 meters @ 90 feet long. (multiple wavelenghts). Multi-band dipoles use "traps". For the given antenna span, coil placement (mid-point), and wire diameter, the calculator suggest an inductance of 42 μH:. Share This Collection. I first adjusted the LC circuit using a 4. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. 07 dB less than the trapless dipole. Noisier than horizontal antennas Easier to hide in antenna restricted areas (can be disguised as flagpole or be a single wire in a tree). 6 pounds, makes it very manageable during the installation process and will allow for a simple mast solution. The only bad thing about Portal is that you can't play it everywhere. 50 MHz, 6 METER, LOOP, ANTENNA, HAM RADIO. ) KHz means 1000 Hertz, MHz means 1,000,000 Hertz, and GHz means 1,000,000,000 Hertz. Using a second set of traps, a "triband" antenna can be resonant at three different bands. All you need is grid dip meter adapter coil which you may buy (costs for MFJ adapter set is about 30 USD) or make it by yourself for few USD. Antenna performance and 2:1 VSWR bandwidth is site dependent and varies with height above ground and surrounding objects. More designs can be found by Googling “80m loaded dipole. We are available during the business hours below: Monday-Friday: 9:00 AM to 7:00 PM CST. The first function of a trap is where the trap is parallel resonant at the operating frequency. Cebik-Antenna-Options. The gateway uses the 781S Smart Antenna to enable flexible remote antenna locations of up to 1300 feet (400 m) allowing the gateway to be in an easily accessible location, while the 781S Smart Antenna can be in hazardous areas near your data points. 132 - Double Bobtail Antenna for 20m. 8-MHz trap is shown without its protective electrical-tape wrap to show the details of trap construction. antenna to the maximum radiation of a reference antenna. It all depends the design. Its gusting 20mph. Antenna Resources. Mouse-over any image to see it larger! Let's work through the design of a simple-to-construct low-cost antenna 'trap' - like the one pictured above - for the 40 metre band, i. but after they have built the traps, I wanted to provide them with a crude but decent method of determining the resonant frequency. TV & Home Theater Accessories. The antennas were mounted at the top of a 6 metre metal mast, and each antenna was placed respectively ¼ wave away from the mast. Amateur Radio, Antenna Theory, Homebrew Antennas, Hidden and Stealth Antennas, CC&R's, and Antenna restriction. I have several choices. Inductance L (µH) Capacitance C (pF) [Return to JavaScript Collection | Return to Homepage | Return to Amateur Radio Page]. Like many hams, I live in a home that's inhospitable to antennas. Another design by KB0ZZ is a little longer, but resonates on both 40m and 80m. While dipoles are very efficient antennas, they are not the only way to go. The correct lengths for the various models will be displayed in the chart. 5 turns on a 120mm length former. Bumpers metal (used) Wood finished tile. During testing, using an ALD ATU, the antenna tuned in to 40m, 20m, 17m, 15m,12M and 10m!. RF Harmonic Measurement setup. Reduce precipitation static and lower background noise with the Tram Amateur Dual-Band Antenna. 80-10 meter OCF antenna layout For the PAL-OCF8010 with 200 feet of RG213 feed line and an average height of 30 feet: For the PAL8010OCF, the impedance is very well behaved in a limited, easy to match range throughout the 1-30 Mhz range and, in fact, that antenna also works very well on 6 and 2 meters with very good gain. Antenna System Evaluator: evaluates the performance of your antenna system, computing the consequences of SWR and feedline loss. We have updated this blog on 11/11/19 to reflect those changes. Traps Now that we have the 35pf trap capacitors, it is time to build the traps. (Not for IE 3). 134 - Taylor Vee Antenna for 20m. The Yard Store has a lot of surplus aircraft aluminum from Boeing, Spirit, Hawker/Beach, Cessna, and Bombardier. (Set of 2 traps) W2VS traps are available for 80 meters and up in two versions. Shortened / loaded 40 meter dipole for attics This morning, I removed from the loft, a pair of nested dipoles for 40 and 20 meters fed with one coax feeder. Two New Multiband Dipoles 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 Trap operation, all turns are used, in the con- ventional manner for a trap. If you only have one support an end-fed antenna may suit you better. Because of this restriction, even the best Part 15 compliant antenna will not be very efficient compared to those big. Basically, this is a coil in the coax feeding the antenna as close to the feed point as possible. Midland Strobe Light for Weather Radios. The antenna wire lengths before trimming are 5. The Wire Size can range from 16 AWG to 12 AWG. The following weekend I began assembling the antenna mast in the garage. Such a trap, utilizing a parallel resonant tuned circuit, offers very high impedance at or near resonance and simply acts as an insulator to effectively cut off the element to a length resonant to the band being used. Typically a dipole can be used down to 1/2 of its resonant frequency. This antenna is made for the Ham operator that ís looking for a compact dipole antenna to work on 40M. My drawing on the right shows about 8 turns. 99-per-month subscription). The first function of a trap is where the trap is parallel resonant at the operating frequency. As seen on his page, the original formula seems to come from an article by J. You can order by phone at 905-602-1382. Purchase price includes two units. trap dipole for 10-80 Antennas by model J-pole. 5 and 7 MHz trap dipole * NU3E attic multiband trap dipole. FM - TV Antennas - TV & Home Theater Accessories - The Home Depot. 3 — The braid of the coaxial cable is used to form the trap coil; it is soldered to the no. The hexagonal beam (or known by many as the hex beam) has become a wildly popular antenna. Solder the antenna to the helical antenna wire. There is enough place to combine the input and output matching components on the same board, as well as the bias resistors and various bias configuration. It will also handle any power from my Alpha amplifier with ease. 2(b): But when erected as an inverted-V you gain a couple of S-points (10 - 12dB) in the. As you probably know by now, all YAGI antennas are a COMPROMISE between various desirable qualities. Traps Now that we have the 35pf trap capacitors, it is time to build the traps. For example a 2-band-dipole needs one trap in each half of the antenna. For the 80 meter band a full wave loop antenna resonant at 3. Due to antenna's length and height above ground. Coils achieving the highest quality factor require large diameter wire, strip or tubing and usually exhibit a cubical form factor; i. For maximum attenuation, the ideal placement of the trap is at a voltage maximum. The Dipole vs Indoor Magnetic Loop Antenna May 12, 2017 Julian OH8STN Ham Radio 0 These days it seems like everyone and their mother is attacking the very popular, small, lightweight, and extremely portable, magnetic loop antenna. Members built their own baluns (a simple 1:1 voltage balun) and a pair of 20 meter coax traps. A coaxial trap antenna is a popular antenna design for amateur radio enthusiasts with limited space who are interested in obtaining increased bandwidth. You need : 1. Full size dipole for 17 meters @ 26 feet long. In this article, you will learn how to calculate the various passive high-pass filters. Search this site. Please call if you have a return. Most dipole antennas are a half wavelength long, and accordingly it is often necessary to calculate the physical. Research has been done in various installation environments and antenna configurations, including some against competitor's products, to evalute for propagation effectiveness. Applying a feed to any antenna in NEC or any electromagnetic simulation software is about a simple a task as can be conceived by placing a “source” of near infinitesimal size inline with a dipole element. 5 Henry inductor?. You can get gain from this antenna on the higher frequencies. (Received October 21, 1964; revised December 12, 1964) In this paper, a method is presented by which the distribution of current on some structurally simple coil or multi turn loop antennas may be obtained. 50 MHz, 6 METER, LOOP, ANTENNA, HAM RADIO. Sold-out Online In Stock. Even with the 20 segment limit, the demo program does a very respectable job analyzing a two-element quad, two- and four-element phased vertical arrays, simple Yagi, W8JK, and many other antennas -- including ones you create from scratch. (Not for IE 3). GM0ONX 6 Band Inverted L Antenna MK3. Consider a 4 trap dipole for 20, 40 & 80. High Gain Antenna Construction WB8ERJ: 4X4 Slimtenna By Eli Kovo 4X4LH: 5 el yagi for 144mhz by N6BG: 5-Element-Yagi für das 2m-Band, DK7ZB: 5/8. Again, hours of reading material here about splitters, FM traps, Filters and successful setups with multiple scanners to one antenna. Fast Setup and takedown. Given the small size of my garden even a long wire contorted with lots of bends wouldn’t easily fit. Topics: antenna, design. The Channel Master LTE Filter improves over the air (antenna) signals by filtering out mobile LTE signal interference. Traps Now that we have the 35pf trap capacitors, it is time to build the traps. Traps for 80 / 160 meter band Dipole or inverted V tuned as a pair. Antennas from QRZ Shareware -- over 40 antenna files ARRL Antenna Projects Loaded With Many Antenna Projects Transmission Line Calculator-- From AA3RL Traps From VE3GK. The amp is only +3. The down side of LKJ Wednesday Night Special Antenna design is that, because it is a shortened antenna, it is very narrow tuning from 1:1. Using this software, you can design and build your own Yagi antenna. 65 - Inverted-V Beam Antenna for 30m. Many hams' first choice of antenna is a half-wave dipole. Your PayPal receipt is your confirmation that we have received your order. The resonant frequency is best checked with a one or two turn loop of thin wire around the centre of the trap with a 6-inch long pair of wires to an antenna analyzer switched to its impedance range. To construct the antenna, build the boom and the elements including the sections EH through ED (driven element) and EA through ED (reflector), as shown in the Cushcraft XM240 manual. 9) in the CW portion of 20m to obtain a 50 Ohm match using my MFJ-259B Antenna Analyzer. In addition, a trap-dipole will perform no better than a dipole, because that. The 20/40 meter Coax Trap dipole antenna seems to work pretty good on 20 meters, on 40 meter had to use the tuner. Ham’s have been using it for many years for ATV and satellite communications. The elements will have a half-length of 160" to ED. Those of you who have heard nothing about this project should look over the Fall ’99 project write up, which can be found at the bottom of the course Project page. These radial wires will provide the needed electrons to move up and down the antenna, but they do not help hold the signal down along the surface of the earth. A soldier in the field did not have time or calculators and had to get the job done. Once these parameters have been determined, many spiral designs are possible by varying the spiral. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating structure supporting a line current so energized that the current has only one node at each end. It's a quick 5 to 10 minute read and will help get you on the way sooner to being on the air. 00 ** The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. It's an 1/8 wave vertical on 160 meters also. TV & Home Theater Accessories. docx Author: Richard Created Date: 6/30/2014 16:29:48. 80-10 meter OCF antenna layout For the PAL-OCF8010 with 200 feet of RG213 feed line and an average height of 30 feet: For the PAL8010OCF, the impedance is very well behaved in a limited, easy to match range throughout the 1-30 Mhz range and, in fact, that antenna also works very well on 6 and 2 meters with very good gain. The All Band Dipole Doublet | The NerdCave - August 14, 2013 […] The vertical antenna was working great on 20-17-15 and with the low sunspot peak I wasn’t too worried about 12m and 10m. • Self Impedance - the impedance at the antenna’s feed point (not the feed point in the shack). View Top Sellers in: In Stock at Store Today (3) Choose your preferred store. The plots were taken on an IFR COM-120B Test Set with a Return Loss Bridge. Antenna Trap Design. Can be operated on non-optimum bands with an external tuner. Cebik-Antenna-Options. Design your own antenna trap online. Current levels beyond the traps were not significant, never rising above 2. uk/java/trap. Poor quality inferior cable can ruin the TV reception of even the best TV. Because the antenna is electrically significantly longer on 80m than on 160m, we have switched to a series resonant circuit. EWE Antenna 9 12. A trap is a parallel circuit of L and C on the frequency you want to close an antenna segment. Video Pixel Offset Calculator Common Tags 4m 10m 12v 15m 17m 18MHz 21MHz 28MHz 40m 70MHz 160m Amsat Antenna Antennas Anytone AT-588 AO-51 Battery Compare Construction Contest Coupler Dipole DK7ZB Dungeness Efficiency End Fed FT-897D FT-991 FTDX1200 Half Wave HF IC-7200 International Space Station Inverted V ISS Photography Portable quarter wave. Traps for Wire Antennas Figs. Modern antennas let you receive both analog signals and digital signals, which most TV stations now use. Of course it may be clear that the best antenna litz can be used with a low resistance. 4 GHz Directional Antenna Calculator Antenna Design Calculator:. For example a 2-band-dipole needs one trap in each half of the antenna. Antenna length. 22 Degree - 2% shorter 30 Degree - 3% shorter 37 Degree - 4% shorter 45 Degree - 5% shorter. By the way, a good starting-point calculator for coax traps for multiband wire antennas is the Coaxial Trap Design software by Tony Field VE6YP - { download: coaxtrap. Full size dipole for 20 meters @ 35 feet long. Inverted Vee Antenna Calculator Enter primary operating frequency in mHz. The major requirement for this antenna was that it had to be ONE WIRE. EZNEC #12AWG dipole. The aluminum was purchased from the Yard Store in Wichita, KS, just 30 miles south of me. The trap can consist of a coil and a separate HV-capacitor. For example a 2-band-dipole needs one trap in each half of the antenna. up-solid down-solid. Measurement results for the S11 (or SWR) a. An Improved Multiband Trap Dipole Antenna You need this—traps with lower loss, higher Q, increased power-handling capability and four-band coverage! By Al Buxton, W8NX This improved multiband trap dipole introduces a new trap design and a change in trap location. 85 would be about 261 feet long. Want great reception? Then a fractal antenna may be your answer. 2 and 3 show a trap made for use Fig. Dipole and Inverted V Antenna Calculator. Should this be a problem, it can be compensated easily by adding 'capacity hats' at the end of these sections, even consisting of 2 small wires of 20 cm mounted in 'T'. You can get gain from this antenna on the higher frequencies. This makes it obvious to use a thick copper cable which has a low resistance after all. In fact, a half-wave dipole will often outperform many compromise commercial multiband antennas. If the shipment is palletized, use the dimensions of the pallet, the combined height of the carton + the pallet, and the total weight of the shipment. Design the antenna assuming a velocity factor of 0. Dual Z0 Short Stubs. The principle corresponds to the sleeve dipole or the coaxial dipole. It has the yagis gain and the quads direct feed and signal capture. dBm to Watt converter Stripline Impedance calculator Microstrip line impedance Antenna G/T Noise temp. When both beams are tuned for maximum performance in the center of a band, the wire beam usually has significantly more performance than a trap beam near both ends of the band. Your first antenna - the half-wave dipole. 8-MHz trap is shown without its protective electrical-tape wrap to show the details of trap construction. 8 to 50 MHz. That is, there is a bit of intuition we can give regarding this antenna as in the preceeding paragraphs; however, generally this antenna is one that has been found to work well in practice after experimentation. This software can not only be used to design but also to find out antenna gain, stacking distance, and Standing Wave Ratio (SWR). Assembling the antenna. It'll only work in strong signal areas where a bit of wire poked in the aerial socket would work nearly as well. The are also found in oscillator circuits. The differences in trap losses and voltages are not negligible! Example is a dipole antenna for 40/80 m, applied power is 100 W, wires are lossless, 10 m above ground, traps made from RG58 C/U, Q = 100. The trap physical design will be substantially influenced by the design of the antenna using the trap. 2m of insulated wire would improve the 80m performance a little, if you have the space, but possibly at the cost of the 14MHz performance. BTW here is a bug in your ear, a hentenna should be able to be used to replace driven elements on two stacked 6m beams one above the other mounted horizontally, with the short sides of the hentenna located where the driven elements were. Rated for 2KW PEP. Shortened / loaded 40 meter dipole for attics This morning, I removed from the loft, a pair of nested dipoles for 40 and 20 meters fed with one coax feeder. There was no difficulty in tuning the Multi-band Trap Dipole Antenna by trimming the wire lengths starting from highest band. For maximum attenuation, the ideal placement of the trap is at a voltage maximum. Another reason why you might use a trapped antenna is that because the inductor in the trap operates as a loading coil it allows the antenna to be shorter end-to-end than a full sized dipole. This is probably a stupid question but can I build a coil/trap with out an analyzer to shorten the antenna to get get it further away from the powerlines? Is there some basic math or online calculator to figure out how much wire and at what diameter to wrap it?. In the following discussion of practical antennas* a number of these favorable relation- ships are used to advantage. The tuning process is the same as for the 40/80 dipole, excpet the 20 m wires are trimmed first to an SWR of 1. IC-706 Screwdriver Tuning. Two New Multiband Dipoles 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 Trap operation, all turns are used, in the con- ventional manner for a trap. those where power flows from an unbalanced line to a balanced line (hence, balun derives from bal ance to un balanced). It offers these great features: Up to Six bands (20 – 6) fed by a single coax Directional with good front/back Low SWR No tuning required, just plug and play Performs well at lower heights Capable of 2,000 watts power Small physical foot print (11 Ft turning radius) …. dBm to Watt converter Stripline Impedance calculator Microstrip line impedance Antenna G/T Noise temp. A soldier in the field did not have time or calculators and had to get the job done. Maxcon Double Bazooka Single Band Dipoles Models for 80, 40 and 20 Meters $99. Jeff , VE1ZAC This is not a new idea, but the method I am suggesting of doing it is novel, and possibly simple to implement ! The caveat is that it is fussy and unique to each antenna situation. Random Length Radiator Wire Antenna 6 6. T2LT stands for "Tuned Transmission Line Trap" Antenna. Stainless Hardware, UV resistant materials throughout. Double Bazooka NVIS Antenna Calculator. The traces leading to the antenna can be just as important as the traces actually in the antenna. Traps Now that we have the 35pf trap capacitors, it is time to build the traps. Traps are made of coax cable using VE6YP coax trap program. Measurements of the dipole are: 9. Antenna Trap Calculator - Design your own antenna trap online Bootstrap coax traps for antennas - Analysis of an antenna trap where a coil is formed of a length of coax cable, the outer conductor of one coax end is tied to the inner conductor of the other coax end, and the remaining connections form the terminals for the trap. Antennas For Communications offers full design and manufacturing capabilities for Conical Horn Reflector Antenna Systems. The antenna can be mounted pretty much anywhere, but you do need to make sure it's facing the right direction to pick up any stations. Sounds complicated, right? Not after you watch this DIY video. HF Dipole Antenna – this antenna software will help you design a simple wire dipole antennas for 1 – 30 MHz. In this case, I wanted to build a 40 meter (7. 40-10 Meter Antennas Over a period of several months prior to the completion of my attic antenna suite I operated with a borrowed AEA Isoloop antenna. This calculator was adapted from the Coil-Shortened Dipole Antenna Calculator. Radial wires that leave the base of the vertical antenna are a wonderful way to provide a ground system. New emergency antenna for mobile and portable. Cebik's papers on antennas and antenna modeling. 5 and 7Mhz) My goal is to optimise this antenna it in the real world for 160 - 80 - 40 and 30 M's Today I will make a big 12V relais with hugh contacts to short out the coils for 160M when I want to use it as a 3,5 and 7MHz antenna. Enter the 4 sides a, b, c and d of the trapezoid in the order as positive real. There was no difficulty in tuning the Multi-band Trap Dipole Antenna by trimming the wire lengths starting from highest band. Multiband Dipole Antenna 10 14. There are lots of yagi design programs on the web, but most of them do not tell you what particular strength the designer was aiming for. Place a 1:1 Balun on the Antenna end of the Feedline. Yagi-Uda antennas consist of a single driven element connected to the transmitter or receiver with a transmission line, and additional "parasitic elements" which are not connected to the transmitter or receiver: a. As annoying as it is, it doesn't look like it's going to stop anytime soon. While dipoles are very efficient antennas, they are not the only way to go. Poor quality inferior cable can ruin the TV reception of even the best TV. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. Traps Now that we have the 35pf trap capacitors, it is time to build the traps. A ground plane antenna is essentially one half of a dipole mounted vertically. 5 turns on a 70mm length of former. 65 - Inverted-V Beam Antenna for 30m. Coaxial- cable traps are inexpensive, easy to construct, stable with respect to temperature variation and capable of operation at surprisingly high power levels. So the 40 meter extension from the trap to the end was 14 ft, 7 inches. 065", 12 gauge is. (13-AWG) wire wound on an Amidon T-400-3 Toroid. It is supposed to be resonant at the base frequency 3,5 MHz and all multiples, that is at 40, 30, 20, 15 and 10 m. See how my early theoretical predictions and descriptions compare to actual field measurements of this most recent antenna theory hoax!. In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. This article is a well-organized tutorial that explains the theory, design, and construction of a 20/40 meter trap dipole antenna, including a list of materials and how to build the traps. I guess my specific question is if there is an alternative to the coax trap that could be used in a similar manner. net 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. The antennas were mounted at the top of a 6 metre metal mast, and each antenna was placed respectively ¼ wave away from the mast. Very small traps, such as used for portable QRP station antennas use iron powder toroids for the inductors. equivalent circuit. Coaxial traps are know to be lousy , but it seems FR-4 based traps are even lousier, at least at 50 MHz. The model that John used (the GH0n ) should be able to pick up digital HDTV channels that you're within range of, and works better with UHF or ultra high frequency channels (channels 14-51) than VHF or very high. The final FM trap designed by Adam uses just 3 common SMD capacitors and 3 hand wound coils. Unlike to others, this notch is then matched to the source/load at the passband frequency. Of course it may be clear that the best antenna litz can be used with a low resistance. Antennas-Amplifiers from Serbia has lots of antannas and more for 4 m. Half-wave dipole antenna: This type is also known as an "aerial. TV & Home Theater Accessories. The inductance should be as. Bootstrap coax traps for antennas Owen Duffy Abstract The article is an analysis of an antenna trap where a coil is formed of a length of coax cable, the outer conductor of one coax end is tied to the inner conductor of the other coax end, and the remaining connections (outer at one end and inner at the other) form the terminals for the trap. uk/java/trap. Without Radials. wave sloper family of antennas described by K1WA, 1 K8UR, 2 K3LR 3,4 and others can be a relatively simple way to make an antenna with modest gain, good F/B and an electrically steerable pattern on 80 or 160 meters. Everything seemed to be okay, but was it? By Steve Ford, WB8IMY. 8 to 40 mHz, and handle powers up to 2 KW PEP (at SWRs of less than 3:1). 131 - Coax-Cable Collinear Antennas. Only 4 parameters need to be known: the design operating frequency, the coil form diameter, the coax diameter and the coax capacitance per foot. W4RNL Antenna Options. 0 without any further tuning. Some of the loops are just one coil, some have tuning capacitors and. An antenna analyzer is the ultimate tool for experimenting with antennas. They will be pointed to the appropriate theory, formulas, and internet calculators to derive the component values, inductance, number of turns, etc. The following program will calculate the lengths needed to construct several popular wire antennas. zip) MS-DOS Antenna Maker – it allows to quickly calculate dimensions for Quads antennas, Yagi antenna, Inverted vees antennas as well as J-poles and Traps to extend dipoles band coverage. DIY 5$ Portable VHF Yagi Antenna for the 2 Meter Band (144-146 MHz) by F4HWK: In this publication i explain how to build a very light weight, cheap, easy to build and deployable in 30 seconds portable VHF antenna for the 2 meter band. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. download HF Dipole (. This is probably a stupid question but can I build a coil/trap with out an analyzer to shorten the antenna to get get it further away from the powerlines? Is there some basic math or online calculator to figure out how much wire and at what diameter to wrap it?. f That’s where the 16. See how my early theoretical predictions and descriptions compare to actual field measurements of this most recent antenna theory hoax!. We would need a tuner at the base of the antenna to match the 50 ohm line to the antenna. We are open for order pickups. In the evening when most of us have time to relax and enjoy a little time on the radio, the higher frequency bands are either dead or very crowded. As seen on his page, the original formula seems to come from an article by J. As mentioned earlier, the antenna in this case is an 80/40 meter trap vertical. This was a fun project that gave us an opportunity to get some hands- on experience with antenna making. Half-wave dipole antenna: This type is also known as an "aerial. antenna performance rather than ground properties. To achieve this gain the antenna must be constructed of the right materials so that losses are reduced to the absolute. Once these parameters have been determined, many spiral designs are possible by varying the spiral. Thanks for your interest in my HWEF article. A high pass filter prevents frequencies below its cut-off frequency from passing and lets through signals above it. 9) in the CW portion of 20m to obtain a 50 Ohm match using my MFJ-259B Antenna Analyzer. Diamond’s new CP5H is a five band (40M, 20M, 15M, 10M and 6M) trap vertical antenna with trap radials. Multiband means better utilization of available space, fewer antennas and coax runs, and means you can put the extra money in high quality. The trap physical design will be substantially influenced by the design of the antenna using the trap. I'm trying to execute commands inside a script using read, and when the user uses Ctrl+C, I want to stop the execution of the command, but not exit the script. Some of the loops are just one coil, some have tuning capacitors and. W4RNL Antenna Options. Theory of Coil Antennas Trilochan Fadhi Division of Engineering and Applied Physics, Harvard University, Cambridge, Mass. up-solid down-solid. Welcome of my homemade loop antenna or loop aerial pages. Mathison (77) and then. La T2FD (Terminated Two Wire Folded Dipole Antenna), è un dipolo ripiegato terminato che presenta un carico essenzialmente resistivo e costante su tutto il range operativo. Dave Tadlock 40,003 views. Following is the list of useful converters and calculators. 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.
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