Portable 80/60m Vertical Antenna. Lacking room for a beverage receiving antenna, we constructed several loop receiving antenna to see if we could find a suitable low /lower noise. All Antennas, Magnetic Loops, Portable. Most transceivers and antennas designed for ham use are based on 50 ohm impedance. The antenna schematic is identical to the 80 meter loop schematic shown on another page. Original knobs, crisp lettering, very good front/rear panels (few nicks) and a clear lighted working meter. The above graphic depicts the overall layout of the loop antenna consisting of 558 ft. Stock availability and shipping volume can delay shipping. Enjoy multi-band operation with omni-directional radiation and significant gain on the 20-10 meter bands. The measurements below are for building a simple Dipole Antenna. In the real world, installed at practical amateur heights (physically close to ground), the range of feedpoint impedance can be from 50-240 Ω depending on configuration, orientation, and choice of feedpoint. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] Doublet – Multi-band antenna that is not resonant on a particular band. great to be able to put wires on the towers or off my. First Prize ($600): "A High Power 160/80-Meter Transmitting Magnetic Loop Antenna" by Steve Adler, VK5SFA. A full wave loop antenna is not a 50 ohm antenna at all, it's typically around 100 - 150 ohms. From the delta loop articles in the internet you can get all kind of formulas such as L = 1005/f for the wire length. I found the 80 m lengths quite a bit short and I had to add about a foot of wire to each leg. I'm impressed. Magnetic Loop Antennas for 160 through 10 meters In the early 1990s, j•Com sold magnetic loop antennas designed by GW4OGP and manufactured in the UK by Advanced Antennas & Ancilleries Ltd. 00 a month and you pay 300. The internal tuner of my FT950 tuned this antenna also on the other bands. com) Buy your LOOP ANTENNA from. Alternate Tail Construction. long wire loop giving a lower takeoff angle than a dipole, which in turn gives a lower takeoff angle than the Loop Skywire. I estimate this was around 60m in circumference. 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. 66 in total. On 160 meters you should see about 110 kHz bandwidth. It comes with a control box (se photo) and an external rely box that is mounted at the mast. Mini No Tune End Fed Half Wave 80-10m Antenna. So what I've tried doing is using my 20 meter loop antenna as a receiving antenna for 75 meters. Most simple CW or SSB receiver circuits for 80 meters will work for ARDF. Our goal is to be able to use this antenna on both 6 meters and 10 meters. a dual loop antenna zz wave net hf wire antenna project by ve6vis the antenna is basically a full wave 80 meter loop on top and a 40 meter loop on the bottom all supported from a 64 foot center support. I have worked HI and AK on 20 meter CW with this setup, but my BEST DX so far was EW8O. I will try to explain in few words how the small magnetic loop antenna works. 144/220/440MHz Tri-Band Handheld With D-Star & APRS. Each antenna has both advantages and disadvantages, but as shown by plot of a long wire loop for 80 meters (one wavelength on 160 meters). MFJ Enterprises Inc,Ameritron,Hy-Gain,Hygain,Cushcraft,Vectronics,Mirage,MFJ,MFJ Enterprises,Antenna,Radio,Ham Radio,Amateur Radio,Tuner,Analyzer,Starkville,Amplifier. 21MHz Delta Loop Antenna, JG1GGF: 40m Delta Mono-Loop: 40 Meter Parasitic Delta Loop Array, W8WWV: 75 Meter Delta Loop Beam, N6IJ: A Simple Loop Aerial for 160/80, G3YXM: An Easy to Install Vertical Loop for 80-6 Meters, KL7JR: Antenna Delta loop bidirettiva, IA5TMF: Antenna vertical delta loop: Antenne delta-loop 160, le 80, le 40 et le 30m, F6CDX. It's probably a lost cause on 80 meters, and doubly so on 160 meters. This article will introduce you to an antenna I call the 3-Dimensional Folded Loop. 0, and also makes the accessories compatible across both Loop antennas. Most diodes have a band which shows which end is the cathode. A loop fed in the southwest corner will have a few dB (3dB or more) gain favoring the northeast corner. This projects was developed as a result of experiments to become QRV on 80 meters, again, using the little balcony. 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. 20 Meter Phased Vertical Antenna. It is designed for portability, and can be assembled or disassembled in about a minute. 80, 60, 40M Double loop convertible (Cap Mod) These days my primary band for data communications is 40M, so my personal build is a collapsible, 2 turn loop, operating on 80, 60, 40m. Figure 2 is a schematic diagram of the antenna. Medium Wave RDF Loop. 80 (foam dielectric): Formulas. The wire was about 75 feet in length and I could tune if from 80 to 10 meters against a 12 foot counterpoise. Progress In Electromagnetics Research M, Vol. [This is the pill bottle connection to allow hooking various experimental antennas to the ladder-line coming from the hamshack. By John Portune W6NBC. A 4-square would be a different story though, and for the uninitiated: a 4-square is 4 x ¼ wave antennas phased in a square, quarter wavelength apart that 'pushes' a lobe of RF (db gain) in a specific direction at the push of a button. The Model 6502 is an active receiving loop antenna, for EMC testing applications. One knife selects the antenna, the other to one of two tuners. Magnetic Loop Antennas references. TAK-tenna 40 to 10 meter Multiband Antenna. K9AY Loop antenn för (40), 80 och 160 meter. 2 Home Made HIGH POWER Magnetic Loop. Vorobyov1,2,* and A. K0ZE approach: Ken chose to build an 80 meter horizontal loop antenna. If not, go for 80 meters or 40 meters. Of course if you initially deploy a quarter-wave sloper wire for 80 meter operation and then decide to use it on 40 meters – it instantly becomes a half wave end fed antenna. Doomsday Loop zButterfly Capacitor: Found on Ebay with. 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. Recently, I’ve been getting requests for 2 meter quads with 2, 4, and 8 elements and even some interest in 6 meter quads. Dimension "A" is the height of the antenna from the base to the apex, not the length of each of the vertical wires. The Skywire Loop Antenna. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] The large diameter yields broadbanded coverage of the 80 Meter Band. comDelta Loop, presenta un valore di circa 125 ohm Antenna delta loop per i 6 79. 15 MHz) operating over average soil (conductivity = 0. A preamplifier is built into the base and provides a 50-ohm output. 80 meter band loop antenna : Page 1 of 1 [ 1 post ] Previous topic | Next topic : Author Message; neutronic Post subject: 80 meter band loop antenna. After watching the video, please read the field test stories below the video as this design flies in the face of a theoretical 80-meter NVIS antenna design. This shortened easy-to-build vertical, with no-radials, is made from surplus military camouflage poles. Installation of Sky-Loop Antenna. The boom length is 138 feet (42 meters). One of the best kept secrets of Amateur radio antennas are either the box, or delta loop antennas. 00! Wow! These guys are making some good markup! Features of the K0WA 40 meter verticle. Skip to content. 5 foot leg). After consulting many of the available Internet sources, and by combining ideas, I was able to assemble an antenna that performed well, even under poor band conditions. Wimax - 802. 196 meters). On those extra long tails that you get with 40, 60, 80, and 160 meter Bazookas. Fig 1—Broadbanding an 80-meter dipole using a fan-shaped pair of unequal-length radiators. This indoor small magnetic loop antenna was an interesting antenna to build and use. I have the Array Solutions K9AY controller, and would like to try to get a half size K9AY system working, so I can try to DX on 80/40/30 this winter. across) are right at the upper limit for operation in the 80 meter band. MANUAL & BROCHURES. Parnell, “Use your tower as a dual band, low band DX antenna, QST, Vol. Recently, I’ve been getting requests for 2 meter quads with 2, 4, and 8 elements and even some interest in 6 meter quads. On 80 meters the loop is clearly the best performer, besting both of the test antennas by at least 2dB overall and by several dB for regional contacts. 99 SBL-80 80 Meter Loop - $121. The feedpoint impedance of a full-wave loop in free space is aproximately 100-120 Ω with a gain over a dipole of 1. That is, the "flat sides" of the antenna are sensitive and there are nulls near the edges. This provides ambiguity as to the direction the signal is coming from. Ameritron MFJ RCR10 on the topp of the tower. RW3DKB Receiving Loop Antenna. I had an 80 meter horizontal loop for a year, but was not able to support 4 corners at any height above about 22 feet. Antenna was originally a 66 foot (22+44 feet) horizontal with 25 feet of 450 ohm LL vertical. 0 LOOP ANTENNA CONTROLLER. Features: Multi-Directional Type: Antenna. Here is a handy chart for determing 1/4 wave verticals, 1/2 wave dipoles, and full wave loop lengths. Perfect for all HF modes including, but not limited to, CW, SSB (USB/LSB), AM, etc. It works just fine and dandy on 20 meters as well but I'd rather have a dedicated 20 meter loop for 20 through 10 meters. Before I added 80 meter, I operated that band with a end-fed wire antenna. Full sized 1/4 wave elevated feed vertical. Yagi Beams & Dipoles. Use the keywords and images as guidance and inspiration for your articles, blog posts or advertising campaigns with various online compaines. My SWR testing on the second harmonics showed RF and SWR needles swinging up and down together which usually isn't a good indication of an efficient antenna. Control box for motor drive. It comes with a control box (se photo) and an external rely box that is mounted at the mast. Cebik's papers on antennas and antenna modeling. Taggart, and 1. For years our group always did well on 80 and 40 meters, but busting pileups or running frequencies on 20, 15 and 10 meters remained elusive. The Silver Bullet is an 80 through 10 meter antenna coil which may be used at power levels up to 200 Watts SSB, 100 Watts CW and 25 Watts with digital modes. Please note that the 3805er is a receive-only antenna. 160m/80m Broadband Antenna by K5GP Here is the pattern of the 160/80 meter antenna on 3. Since the antenna is only up from 15 feet to about 35 feet above the ground, it is not a DX antenna on 160 or 75/80. Your 80 meter loop with 80′ of LL to a 993 should work very well. Full size dipole for 20 meters @ 35 feet long. Attic antennas •Many types of antenna can be mounted in the attic IF you don't have Radiant Barrier (Tech Shield). of TV twin lead (300 ohm). Click & Collect. 16m and LTE Advanced are working in similarities to compromise ITU IMT advanced which is the base line for the 4G requirement and working with an aim for optimizations. They can be highly effective as well as portable. comDelta Loop, presenta un valore di circa 125 ohm Antenna delta loop per i 6 79. In a RTTY contest, the Band is full of big signals and lots of noise. The following photos and writeup are the results. The loop is no longeroperating in the mode of a magnetic loop. Again the. 9 MHz, it would be 1005 / 1. spacing and a switch to put the loop's in parallel or in series, the antenna becomes a 80-10 m. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. 1-144 MHz, 2 METER, LOOP, ANTENNA, + 1 Phasing Harness, HAM RADIO. Most simple CW or SSB receiver circuits for 80 meters will work for ARDF. It also reached much further out with almost double the average and more than double the maximum distance to a receiving station. The feedpoint uses a 6 inch section of ½ inch diameter PVC pipe. I like to use a home made current choke to keep RF from coming back on the feedline. Jan 29, 2018 - A Low Cost Loop Antenna for 160 and 80 Meters Stay safe and healthy. Portable 80/60m Vertical Antenna. 20 Meter Phased Vertical Antenna. DX-EE - “No-Trap” 40-20-15-10 meter dipole or inverted V. I love my loop, if you can't tell. An 80 meter dipole would be about 134 feet long. On 160 meters you should see about 110 kHz bandwidth. a dual loop antenna zz wave net hf wire antenna project by ve6vis the antenna is basically a full wave 80 meter loop on top and a 40 meter loop on the bottom all supported from a 64 foot center support. He commented to me that, even if a loop is only 10% efficient, that is only down 10 dB - about 1 1/2 S units. RW3DKB Loop Balcony Antenna (ALL HF) Simple Window Loop Antenna. I have now built several of these antennas with equal success every time. I have never heard that the coax needs to be a particular length for the antenna to work. Installation of Sky-Loop Antenna. By simply adding a second loop with a 5 cm. a dual loop antenna zz wave net hf wire antenna project by ve6vis the antenna is basically a full wave 80 meter loop on top and a 40 meter loop on the bottom all supported from a 64 foot center support. Listed under the Antennas/40M/40 meter Loop Antennas category that is about Loop Antenna projects for 40 meters band. However, you may find that your mono band delta loop may tune up on it's second harmonic at a higher frequency eg. 125 tubing $1. NEW! The 10-80 Meter Alpha Loop antenna handles 100 Watts PEP SSB on 10-40 Meters and 20W on 40/60/80 Meters when the included Booster Cable is installed. Full size dipole for 20 meters @ 35 feet long. Made out of aluminum tubing Uses PVC as an insulator Is 32 feet high. How To Obtain A Ham License. This version of the Alpha Loop has been designed to enable micro-tuning between the top outer and inner loops. 40 meter Delta Loop Joe on 21st Oct 2016 I recently purchase a 40 meter Delta Loop from Chris and received the antenna few days later after the purchase, I hung up the antenna in less than one hour in configuration, C , I hook up my antenna analyzer after the installation and I was Very surprise is flat 1:1 on the entire 40 meter band, 20 meter was about 1:2 on the top edge of the band and the. 798 feet • 160 meters 528. 59 20 METER ROTATABLE DIPOLE ANTENNA PROJECT. MFJ-1778 G5RV Multiband Antenna 30 meter band: On 30 meters the MFJ-1778 (G5RV) functions as an extended double zepp. In the handbook the specifications for this antenna indicated it would' work on all of the bands above 80 metres also, that is 40 - 30 - 20 –17 - 15 - 12 and 10 metres. 88 ft and 44 ft are popular lengths. Easier than a preamp. (If you must use a half wave end-fed antenna, make SURE you ground the radio and the matching transformer secondary to avoid RF burns from the chassis. Within this physical description there are two distinct antenna types: The large self-resonant loop antenna has a circumference close to one wavelength of the operating frequency and so is resonant at that frequency. Less than the ideal of 12. I estimate this was around 60m in circumference. Fig 1—Broadbanding an 80-meter dipole using a fan-shaped pair of unequal-length radiators. A double doublet antenna enables 80 meters and 40 meters to coexist on the same antenna system without interfering with each other. The Alpha Loop is a 10-40 Meter transmit/receive magnetic loop antenna, which handles 100 Watts PEP SSB, 50 Watts CW, and 25 Watts Digital. Design and build a 100w plus Magnetic Loop Antenna for HF bands 10-80 - drjbbiii/10-80-meter-Magnetic-Loop-Antenna-100w-plus. E (V/m) = Electric field strength in volts per meter (V/m) at a distance (d = 1 meter) from an antenna with unity gain (G=1). The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. Deals and pricing on new and used Dentron Antenna Super Tuner Rated 1000 watts 160 thru 10 meters CB / Ham Radio for sale Tuner Loop Antenna Butterfly Type Air. A loop fed in the southwest corner will have a few dB (3dB or more) gain favoring the northeast corner. Cebik's papers on antennas and antenna modeling. MFJ1786 10-30 MHz Loop. This post relates to the design and build of a 160/80/40 Meter magnetic loop antenna. It is important to note that …. 86 - Fan-Dipole Antenna for 80m to 6m. Full size dipole for 40 meters @ 70 feet long. Cubex Quad 2 elements 10-12-15-17-20 meter. The stub in the top leg of the antenna opens the loop when operating on 40 meters and selected other bands. The rest of the antenna wire is pulled down with a rope. YES, I am still building 160/ 80m, 80m and 160m receive loops. The large diameter yields broadbanded coverage of the 80 Meter Band. A classic 80 meters Zepp antenna was used as reference at a height of 20 meters, while the loop was mounted on a 2 meters pipe. AB0X Roof Loop 2. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. The feedpoint impedance of a loop never gets as high or low as with an antenna that has free ends. The antennas would be easy to construct and would be inexpensive. I needed to take about 2 feet off the horizontal section to get mine resonant at 1830. 81 - Inverted-L for 160m. This is very similar to the latest P-LOOP 2. These are closed loops that are one full wavelength long. 99 SBL-80 80 Meter Loop - $121. Construction. This antenna may be built as a 20 meter, 17 meter, 15 meter, 12 meter or 10 meter monoband vertical antenna. The NEC output included in this iteration include: the 4NEC2 calculation input / output page, feed impedance plots, a diagrammatic image of the radiated pattern at a distance of 1 kilometre, antenna current for an input power of 100 watts, vertical gain in dB and finally the loop's radiated vertical signal level at a distance of 1 kilometre also for an input of 100 watts. 5MHz ham radio band when the mast is only about 14 metres or 45 feet high. The 160 antenna covers 1800-1860 with under 2:1 SWR. The shape isn't all that critical at all. Mini UnUnTenna 40-10m. There are a number of antenna types that could be considered to be a small receiving loop, but herein I am referring only to those loops that meet the description above. Reviewed by Bob Allison, WB1GCMAssistant Laboratory [email protected] Mini Super Loop 2 Vertical Loops in Phase on 40M Antenna design by WH2T Dr. Tokyo Hamufea 2015 - the BABY Loop. The current distribution of the antenna and matching line is shown in figure 3. 9 Mhz = 257 Feet 8 inches. Bob Legg W6QYY built this 80-meter RDF antenna to use on foot with his MF/HF/VHF multi-mode hand-held scanner at a southern California hunt. The Flagpole Deluxe. This type of antenna radiates most of its signal at very high angles, which is perfect for using Near Vertical Incidence Skywave (NVIS) propagation to contact stations up to about 500 miles away on the 80 meter band. Here is the link to Greg's page on his 80 meter loop antenna. electrical antennas. This is usually the length where some HAMS may come to the very painfull constatation that the lot or available space to play with antenna's should be much bigger (for an antenna freak, the lot should ALWAYS be bigger). I have looked all over the internet to try to find drawings on how to build a magnetic loop antenna that will cover at least 40-10 meters I know mfj makes one but you must understand when you live on 751. If 80-meter current flows in the 160 antenna, it tends to flatten the current loop in the vertical section. •20 meters and above or 80 meters and above TV antenna 20 mtr 40 mtr 80 mtr. Dipole Antenna Calculator. All combinations of the 3 antennas can be selected. HF loop magnetic antenna from 80 to 20 m continuous coverage Alluminium T. For 40M this works out to be 1005/7. Vertical or Horizontal Loop: The best balun for operation moderately far from resonance or on harmonics is a 4:1 ratio current Tuner. 00 for 6” wide aluminum flashing 40 foot roll. Easier than a preamp. All on 20 meters using about 50 watts. The formulas for calculating the approximate length of a full-wave loop antenna are: Full-wave loop in feet = 1005 / frequency in MHz; Full-wave in meters = 306 / frequency in MHz. THE STEALTH MAGNETIC LOOP is a small HF antenna with continuous coverage from 40 to 10 m. a horizontal loop. Connecting antennas. antennas ?" It is hard to believe twenty years have gone by, but to answer the question. Doublet – Multi-band antenna that is not resonant on a particular band. 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. long wire loop giving a lower takeoff angle than a dipole, which in turn gives a lower takeoff angle than the Loop Skywire. This corresponds to the NEC2 model fairly closely (NEC2 model L = 44. ARRL Product Review of the M2 6-Meter HO Loop Antennas. Reviewed by Bob Allison, WB1GCMAssistant Laboratory [email protected] 99 SBL-80 80 Meter Loop - $121. 00 of that in rentand about 100. Before I added 80 meter, I operated that band with a end-fed wire antenna. Stop by our company right away. What follows is a very inexpensive indoor receiving loop which covers both 80/75 and 160 meters. The preamplifier helps this loop antenna produce good sensitivity and almost constant antenna factors when testing for EMC applications. The multi band HF loop antenna, a good performer on 80 and 40-10 meters. 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 Alpha Loop is a 10-40 Meter transmit/receive magnetic loop antenna, which handles 100 Watts PEP SSB, 50 Watts CW, and 25 Watts Digital. But no, don't route the feed-line as described. SENTINEL BARRETT 160-6 METER HEXBEAM. Flexible range of application. a dual loop antenna zz wave net hf wire antenna project by ve6vis the antenna is basically a full wave 80 meter loop on top and a 40 meter loop on the bottom all supported from a 64 foot center support. If you've got to hide your antenna, make this flagpole do double duty as an efficient four-band vertical. 57 coax|120. T he purpose of the calculator is to give you a quick overview of the feasibility of "squeezing" a loop into your available yard or apartment space. For 160 meters a full wave loop antenna resonant at 1. This design also allows me to maximize the amount of antenna that I can fit on my 1/2 acre lot (an 80 meter loop is only 72ft on a side vs the 135ft overall length of an 80 meter dipole) without. At A, for vertical polariza­. Loop antenna calculators suggest that a loop of that size can be tune from 40 to 10 mtrs with a variable capacitor of 10-180 pF. On 80 meters the loop is clearly the best performer, besting both of the test antennas by at least 2dB overall and by several dB for regional contacts. Tri-Band Fan Vertical. I played some in the recent 160-meter contest and did fine at that distance. About 15 years ago, after conducting a series of extensive experimental modeling studies, I erected an 80-meter halfdelta loop in the back yard. The Skywire Loop Antenna. 2 Home Made HIGH POWER Magnetic Loop. Listed under the Antennas/40M/40 meter Loop Antennas category that is about Loop Antenna projects for 40 meters band. 20m Delta Loop. On 80-meters, ~9uHy is needed for antenna matching. 3 wavelength; approx. 5 MHz to 8 MHz. 1-144 MHz, 2 METER, LOOP, ANTENNA, + 1 Phasing Harness, HAM RADIO. On 40 meters the ladder line stub automatically acts as a switch and opens the connection across the insulator so the antenna works as 2. Topics: antenna, design. Our goal is to be able to use this antenna on both 6 meters and 10 meters. One for each antenna two for each antenna Used to select which of two antenna to TX on Used to support each end of coax (all three runs) two HF and one VHF/UHF VHF/UHF antenna best available for the money Enough end connectors for whole system install Plus a few extra. - Duration: 22:05. When I saw a video of the new F-Loop 2. So, what about 80 meters? This question presented quite a dilemma. a dual loop antenna zz wave net hf wire antenna project by ve6vis the antenna is basically a full wave 80 meter loop on top and a 40 meter loop on the bottom all supported from a 64 foot center support. Indoor Random Wire versus Indoor Magnetic Loop Test. QST May 1993, p. Full Size Quad Loop 2. This is a 10 foot piece of 2" fiberglass piping with a 1/4" wall thickness. Here is the link to Greg's page on his 80 meter loop antenna. 9 Mhz would be about 529 feet long. This had 4 x 2 inch coils in each corner of the loop with 30 turns of 1mm wire and I stretched the loop all around the garden and even inside the attic to make the loop as big as I could. Ameritron MFJ RCR10 on the topp of the tower. Again, the loop was the antenna-of-choice for Receive. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. The dipole antenna is an excellent option for many amateur radio applications especially on the HF bands like 80 metres, 40 metres, 20 metres, 15 metres and 10 metres. Of course if you initially deploy a quarter-wave sloper wire for 80 meter operation and then decide to use it on 40 meters – it instantly becomes a half wave end fed antenna. So what I've tried doing is using my 20 meter loop antenna as a receiving antenna for 75 meters. a horizontal loop. Total set-up time for the antenna and radio this second time was less than twenty minutes. W4RNL Antenna Options. 5:1 12 meters 2. HF ANTENNA IDEAS FOR THE HOA RESTRICTED HAM MAKE SURE THE NEIGHBORS CAN’T SEE YOUR ANTENNAS SOLUTIONS FOR 80, 40, 20, 17, 15 10 METERS -PRESENTED BY KD6RM-. 300 Ohm Twin Lead with the ends shorted is an option for even greater bandwidth. Note that 44 + 25 equals about a quarter wave for 80 meters if used as an inverted L antenna. All antenna lengths in the information below are in feet and are the results based on the standard formula of 468 / FMhz = total length in feet. 7J4AAL's Full-Size, 5-Element, 80-Meter, Rotary Beam Antenna This amazing antenna is located near Hiroshima, Japan. Because the loop is small, it is often possible to place it among trees or shrubs in a front or. This new open wire area also needs to be sealed very well with silicone or non-conductive epoxy to make it water proof. Portable 80/60m Vertical Antenna. 2 Home Made HIGH POWER Magnetic Loop. A magnetic loop for the 80 meter band should be 15 ft diameter to produce efficiency of 88%. MFJ Enterprises Inc,Ameritron,Hy-Gain,Hygain,Cushcraft,Vectronics,Mirage,MFJ,MFJ Enterprises,Antenna,Radio,Ham Radio,Amateur Radio,Tuner,Analyzer,Starkville,Amplifier. This improves the antenna's radiation pattern. pmd 4 2/9/2005, 1:21 PM Fig 10-5—Radiation angle and gain of the horizontally and the vertically polarized square loops at different heights over good ground. or Best Offer +$30. Loop Magnetica 40 a 15m P/Movil, LU2DC Magnetic Loop, made for bands between 40 and 15 meters. They generally cover either the 10 through 20 meter, or the 20 through 40 meters bands. Many contacts were made on 20, 15, and 10 meters using PSK-31 and 10 watts. I found the 80 m lengths quite a bit short and I had to add about a foot of wire to each leg. Full size dipole for 160 meters @ 268 feet long. The peak electric field is shown. 81 - Inverted-L for 160m. An 80 meter dipole would be about 134 feet long. Without Radials. You're on your own for 80 Meters. Here is the link to Greg's page on his 80 meter loop antenna. 80- to 6 Meter Window Balcony Antenna with Tuner. The overall wire length in my situation is about 60 feet when running a closed loop based on a room size of 12’ x 12’. The 8 Shape Magnetic Loop with control box is the best performing and most convenient small space antenna available to amateurs today. If we have a loop like this with a high feedpoint resistance, over 10-20 ohms, the antenna has very high loss. Maximize your signal and minimize noise with antenna accessories such as antenna switches, vertical add-on kits, variable phasing controllers, baluns, radial. 75 Meter coaxial loop for receiving. 40m, fed buy a separate coax. Half way there is another 80 meter coax trap. by Harry Lythall - SM0VPO. I have only found a small bit of recent data [ 2 ] comparing an 1. My MFJ-259C antenna analyzer shows the input impedance of the loop to be 200 ohms at 50. 80 Meter NVIS Antenna - Don't Get Hung Up on Theory Watch the following video to see how to build and erect a basic 80-meter NVIS antenna. Use our keyword device to find new key phrases and suggestions for the quest term 20 Meter Band. Full size dipole for 17 meters @ 26 feet long. DX Engineerings 300 ohm line (VF=0. Needed materials are: 60 meters of wire for the antenna; 23 meter height. : 160 M Antennas. By adding another original Slinky coil to each end of the 40 meter dipole, and stretching the whole antenna to about 30 feet in length, you can make an 80 meter dipole that will fit in most attics and family rooms and even a basement ceiling or hallway. 85 - Backpack J-Pole Antenna for 10m, 6m, 2m. If we have a loop like this with a high feedpoint resistance, over 10-20 ohms, the antenna has very high loss. 1:1 SWR at the antenna connector of each Vertical. The formula used to find a full wave loop antenna is 1005 / FMhz. I have looked all over the internet to try to find drawings on how to build a magnetic loop antenna that will cover at least 40-10 meters I know mfj makes one but you must understand when you live on 751. A resonant loop antenna has gain at right angles to the plane of the loop. by Harry Lythall - SM0VPO. On 40 meters the SuperLoop 80™ is a 2 wavelength open loop or Bi-Square. I played some in the recent 160-meter contest and did fine at that distance. The End Wire Size can range from 16 AWG to 12 AWG. Our goal is to be able to use this antenna on both 6 meters and 10 meters. Note: This transmitting doorknob capacitor will kill the efficiency of the loop. The overall wire length in my situation is about 60 feet when running a closed loop based on a room size of 12’ x 12’. Alternate Tail Construction. Inside the tuner is a shortcut between the centre and the braid of the coax loop to form a solid ring. a dual loop antenna zz wave net hf wire antenna project by ve6vis the antenna is basically a full wave 80 meter loop on top and a 40 meter loop on the bottom all supported from a 64 foot center support. This is the Spi-Ro LC-80 antenna shortener. Each leg is about 70 feet long with the wires running N/S and E/W. Aug 19, 2019 - Explore bethsbull's board "Radio", followed by 279 people on Pinterest. Antenna gain is measured in either dBi or dBd. com) Buy your LOOP ANTENNA from. This version of the Alpha Loop has been designed to enable micro-tuning between the top outer and inner loops. Of course if you initially deploy a quarter-wave sloper wire for 80 meter operation and then decide to use it on 40 meters – it instantly becomes a half wave end fed antenna. Why? Why? I want to do 80 mtrs DX, but I have no room for a decent 80 m wire-antenna, nor would I be able to install such an antenna high enough above ground. I can, though, reliably work out about 500 to 600 miles on 160. Please practice hand-washing and social distancing, and check out our resources for adapting to these times. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. I decided to install an 40 meter dipole in my attic space which is about 25 by 45 feet, and about 25 feet up from the ground. New listing Orginal Bose 199824-002 AM Loop Antenna for Lifestyle 20/25/30/40/50 2. The following photos and writeup are the results. 83 - Tri-Band Beam for 20m, 15m, 10m. in co pan in meds. A full wave for 3. Skip to content. Antenna wire can be #14 hard-drawn antenna wire. 80 Meter CW Center Frequency: 3. So what I've tried doing is using my 20 meter loop antenna as a receiving antenna for 75 meters. See more ideas about Ham radio and Ham radio antenna. The nice thing about 80 meters is that it’s very good in the middle of the day for the distances involved (e. ProMaster HF antenna Built for harshest military and civilian environments, the Alpha ProMaster is the tuner free 10-80 meter 500 Watt base & transportable antenna. 185 feet • 40 meters 140. by Harry Lythall - SM0VPO. July 19, 2014September 17, 2014 Vertical Delta Loops 99 The Vertical Delta Loop • A three sided loop is known as a Vertical Delta loop sitting on the ground. If plagued by local QRM, lack of space or tall masts for a full-sized 80 or 40m dipole, the magnetic loop antenna may prove to be a useful alternative. Remember as with all antennas, be safe and use your head. of #16 "silky" stranded wire cut to one wavelength long on. This is a working 1200 PEP watt antenna tuner for 160-10 meters. Power Input - 1000 watts PEP** Wind Load (sq. Even a 40-meter loop can offer full 80- 10-meter coverage. 196 meters). David Casler 26,001 views. I have built dozens of them, and continue to model, test and research more variations of them. 405 inch diameter coaxial cable. a dual loop antenna zz wave net hf wire antenna project by ve6vis the antenna is basically a full wave 80 meter loop on top and a 40 meter loop on the bottom all supported from a 64 foot center support. Changing bands is accomplished with the flip of a toggle switch. From: "Stauffer, Don (MN65)" Subject: Two questions on seismographs Date: 02 Jan 1997 15:16:07 -0600 Just subscribed to the list, so if these questions are frequent (did browse some of the FAQ, but didn't find them) please bear with me. LOOP SKYWIRE ANTENNA CONSTRUCTION The Loop Skywire Antenna, is a very effective design for DX. Simultaneous HF and 2 meters. DX Engineering receive antenna systems feature the best designs available for HF DXing, as well as for "AM DXing" on the MW Broadcast Band and for the Short Wave Listening bands (SWL). The antenna is a 60 foot dipole, bent into a rectangle, and fed at one corner with Radio Shack TV Twinlead into a MFJ 4:1 balun and tuned with a LDG Z11 Pro autotuner. 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. Full size dipole for 17 meters @ 26 feet long. 22 acres) is great for taxes but limited in antenna potential and zoning laws prevent real towers. What follows is a very inexpensive indoor receiving loop which covers both 80/75 and 160 meters. [email protected]> Subject: Geophones Date: Mon, 30 Jun 1997 20:19:59 -0400 Hi gang, I just got the current catalog of Mitcham Industries (www. One of this summer's projects was to put up a full-wave 80 meter horizontal loop antenna, sometimes called a "loop skywire". Listed under the Antennas/40M/40 meter Loop Antennas category that is about Loop Antenna projects for 40 meters band. Boom = 30 in/76cm; sprial radiating element = 30 in/76 cm diameter; weight = 4 Lbs/1,8Kg. " K6TOS "Excellent service and. MFJ Enterprises Inc,Ameritron,Hy-Gain,Hygain,Cushcraft,Vectronics,Mirage,MFJ,MFJ Enterprises,Antenna,Radio,Ham Radio,Amateur Radio,Tuner,Analyzer,Starkville,Amplifier. The circumference of a true magnetic loop should be less than 1/10th wavelength and the coupling loop at 1/5 ratio to the main loop. On 160 meters you should see about 110 kHz bandwidth. It is a great complement to vertical or wire transmit antennas. pmd 4 2/9/2005, 1:21 PM Fig 10-5—Radiation angle and gain of the horizontally and the vertically polarized square loops at different heights over good ground. All bands 80m-10m HF 3. Info For Digital TV Antenna Signal Meter Around Here Hialeah FL. I used a 50pf vacuum variable. The cross is the 80 meter coax trap. It also reached much further out with almost double the average and more than double the maximum distance to a receiving station. Note : This function applies to far-field calculations only (d > l /2 p ). 300 Ohm Twin Lead with the ends shorted is an option for even greater bandwidth. Needed materials are: 60 meters of wire for the antenna; 23 meter height. 40m-10m DELTA LOOP ANTENNA - GU3WHN The variety of one wave length loop shapes that can be deployed to suit the QTH. How to build a mono band 80 meter 1/2 wave wire antenna. Extended Double Zepp – Longer than a dipole. I am still in the learning process myself. So, what about 80 meters? This question presented quite a dilemma. Some TIPS on measuring VSWR and troubleshooting M2 … Antenna Gain: dBi vs. 1 over entire band 40 meters swr 1. Surprisingly so. Antenna Loop Links. 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. By Richard Q. From Array Solutions comes this control box AS-AYL-4 for assembling a low band receiving antenna in four directions based on the famous K9AY loop concept. 160m-10m broad band element fed by a third coax. 82 - 300ohm-Ribbon Dual Band Dipole. Mest, WBØAOF, has tried numerous types of antenna systems on 80 meters but the pyramid antenna is, by far, the best system he has found for him. Full size dipole for 160 meters @ 268 feet long. This loop requires a minor modification to the tuning capacitor, switching it from two gangs in series, to a parallel configuration. All Antennas, Magnetic Loops, Portable. The larger the wire, the wider the bandwidth. With no tuner 80, 40 and 20 meters read less than 1. (If you must use a half wave end-fed antenna, make SURE you ground the radio and the matching transformer secondary to avoid RF burns from the chassis. 99 K4TR FULL WAVE DELTA LOOP Another made to order classic antenna which is also a superb performer. as of 2020. For years our group always did well on 80 and 40 meters, but busting pileups or running frequencies on 20, 15 and 10 meters remained elusive. This is im-practical in many instances. 75 Meter coaxial loop for receiving. Full size dipole for 40 meters @ 70 feet long. This post relates to the design and build of a 160/80/40 Meter magnetic loop antenna. 5 1996 N6LF discusses a simple way to broadband the classic half-square antenna to operate in both the CW and SSB “DX windows” on 80/75 meters. This antenna may be built as a 20 meter, 17 meter, 15 meter, 12 meter or 10 meter monoband vertical antenna. (when switch to 3. An adaptive matching circuit at the reader is pro-posed for achieving optimum power delivery performance when. 0, and also makes the accessories compatible across both Loop antennas. This project started with Field Day. "When I think back a few years. It works just fine and dandy on 20 meters as well but I'd rather have a dedicated 20 meter loop for 20 through 10 meters. Multiband operation is achieved by use of 300 ohm balanced line fed to an antenna tuner. KC2TX 160/80m Coaxial Loop Receiving Antennas: 80/75 Meter 4-Square Array, KE7EM: End feed Antenna for HF Bands: Antena Dipolo corto sin trampas para 80-40 y 15 Mts. Base HF ProMaster Antenna; Base & Portable HF 100 Watt Magnetic Loop Antenna; Base Portable HF J-Pole Alpha Antenna; Mobile HF Alpha MOTO Antenna; Portable HF DX EMCOMM Alpha Antenna; Portable HF FMJ Antenna; Portable HF VHF UHF HexTenna Alpha Antenna; My account; Cart (Total excludes import duty tax). Again, the loop was the antenna-of-choice for Receive. First Prize ($600): "A High Power 160/80-Meter Transmitting Magnetic Loop Antenna" by Steve Adler, VK5SFA. Magnetic vs. Originally: $399. They can be highly effective as well as portable. I have a antennas optimized for each band because I have enough space and trees for supports. GL MNY 73. I therefore decided on a concentric configuration similar to a multi-band quad antenna. The 160 antenna covers 1800-1860 with under 2:1 SWR. After consulting many of the available Internet sources, and by combining ideas, I was able to assemble an antenna that performed well, even under poor band conditions. 79 - Wire Ground Plane Antenna. HF Mobile Magnetic Loop Antenna (Part 1) I recently returned from Afghanistan, where I encountered a number of nifty radio toys. If you decide to feed your loop with coax, I'd suggest using RG-8X or RG-213 and a high power, high performance 1:1 or 4:1 Current-type balun. Magnetic Loop Antennas on 3. There is a general lack of measured data comparing small transmitting loop antennas to some sort of standard antenna. Base HF ProMaster Antenna; Base & Portable HF 100 Watt Magnetic Loop Antenna; Base Portable HF J-Pole Alpha Antenna; Mobile HF Alpha MOTO Antenna; Portable HF DX EMCOMM Alpha Antenna; Portable HF FMJ Antenna; Portable HF VHF UHF HexTenna Alpha Antenna; My account; Cart (Total excludes import duty tax). The calculator yields a reasonable approximation of dimensions, to within 5% over the amateur bands, using typical wire gauges ranging from #12-18 AWG. Total set-up time for the antenna and radio this second time was less than twenty minutes. 196 meters). QRP portable qrp skcc contest portable qrp antenna cw DX SOTA hoa restricted antenna morse code stealth antenna elecraft kx3 ham radio kx3 magnetic loop qrp antenna JT-65 WSPR calling cq digital modes mag loop qrpp reverse beacon network ssb #proudofmyson 10 meter 2 meter portable j-pole CWOpps EI13CLAN JT-9 Wake Island camping copper j-pole. Listed under the Antennas/40M/40 meter Loop Antennas category that is about Loop Antenna projects for 40 meters band. The ladder-line feedline coming from my 80-meter antenna is terminated in a pair of banana plugs that plugs into the coupling at eye level. Half way there is another 80 meter coax trap. I do use a tuner but could function without one 80 meters 1:8-1 40 meters 1. Your antenna is now built and ready to be strung up. Construction. 1 wavelength across the diameter or longest diagonal dimension. My SWR testing on the second harmonics showed RF and SWR needles swinging up and down together which usually isn't a good indication of an efficient antenna. A blog about Amateur Radio and Amateur Radio Antennas. org The … K6MYC on Antenna Testing. Doomsday Loop zButterfly Capacitor: Found on Ebay with. Fractal has a unique petal-pattern main loop formed from aluminium flat bar 3 mm thick, 36 mm wide. pmd 4 2/9/2005, 1:21 PM Fig 10-5—Radiation angle and gain of the horizontally and the vertically polarized square loops at different heights over good ground. Area Riservata. The Group moderators are responsible for maintaining their community and can address these issues. HOW TO MAKE A PANEL ANTENNA I have noticed many panel antennas for sale on the net and people are paying good money for them too. Most diodes have a band which shows which end is the cathode. My 40 meter vertical cost me $13. Be sure that the receiver has CW or SSB modes in addition to FM, because 80m foxes send keyed CW. 5% (1/8th wavelength). Requirements for the 2018 QST Antenna Design Competition included an antenna for one or more bands between 2200 meters and 10 meters that could fit within a 30 × 50 foot area and be no taller than 30 feet above ground at any point. • Noise from antenna must dominate receiver noise. 9 MHz, it would be 1005 / 1. In October 2012 I changed my 160 meter transmitting antenna to an Inverted L with FCP (folded counter poise). 0 MHz,) performance was sub-par, since the dipole was only 25 feet above the ground, and that’s just a fraction of a wavelength on 160 meters. Get the power of a Super Antenna. Most caps - except air and vacuum - have a low Q. A 40 meter loop requires less than 130 linear feet of insulated wire. The rest of the antenna wire is pulled down with a rope. If an antenna works on 40. This indoor small magnetic loop antenna was an interesting antenna to build and use. 4:1 18 meters 1. for Medium Wave and Long Wave reception plus a dual-band transmitting loop for 160 and 80 meters. 10-80 Meter Alpha Loop, 100W 10-40M, 20W 40-80 magnetic. by Harry Lythall - SM0VPO. This project started with Field Day. Click on Calculate and the optimum length for that combination will be displayed in feet, inches and fractions of inches, and in meters. 5% (1/8th wavelength). For example, a ½ wave dipole required for operation in the 80 meter amateur band would need a tower that would be at least 40 meters high. The loop self-inductance can be resonated with capacitance to form a high-Q parallel tuned circuit. Sir Gary N3GO's 1-meter loop Hi Guys; This is a photo of the loop I demo'ed at QRPigOut Last night. 349 feet • 17 meters 55. Traditionally, HF – specifically 75 meters – has been used as that was the only thing that one could hope could get out of 1/4-1/2 mile deep gorges with only a narrow view of the sky and over the years, many HF antennas were tried. org The … K6MYC on Antenna Testing. The traditional definition from ham radio circles is that it is a full wave loop antenna, oriented in the horizontal plane. On 80 meters the loop is clearly the best performer, besting both of the test antennas by at least 2dB overall and by several dB for regional contacts. 775 likes · 2 talking about this. It is a three turn loop closed by a 100PF capacitor covering continuously from 3. WIKIPEDIA, The Last Word on (>80%) zVery Easy Experimentation zVery Easy Design (using online calculators) Sample Project—Doomsday Loop High Power Loop 15 and 20 Meter Coverage. 80 meter loop frequency plot The table above makes it fairly easy to choose the feedpoint impedance for the 80 meter loop antenna. I do not have an antenna for 160 but do listen from time to time. After consulting many of the available Internet sources, and by combining ideas, I was able to assemble an antenna that performed well, even under poor band conditions. I recently saw that my 80m (3. There is no issue with a horizontal small loop per se. This post relates to the design and build of a 160/80/40 Meter magnetic loop antenna. Your antenna is now built and ready to be strung up. Short Delta Loop Antenna for 40 to 6 meters bands Yes, you can double the size of the antenna and the value of the load, to design for 80 meters band. So what I've tried doing is using my 20 meter loop antenna as a receiving antenna for 75 meters. Cebik W4RLN) seem to point to best performance on 40-meters at 0. The antenna comes with a 3′ coaxial cable to attach the antenna BNC output to a SO-259/PL-259 input of your receiver (most receivers). Reference loop, 40-meter full wave loop 36-feet high over medium soil, opened opposite feedpoint to make reasonable feed impedance on 80 meters. The 160 Meter Position during ARRL DX CW with W0AIH at the helm. Simply mount the antenna 6 feet off the ground (or higher) on any conductive or non-conductive. The objective of the loading is to "lift" the current nodes higher in the vertical space available for the antenna. All antennas are fully rotatable, with lower two on ring rotating assemblies. I had an 80 meter horizontal loop for a year, but was not able to support 4 corners at any height above about 22 feet. I will first describe the basic 3-DFL and then provide construction details for the 2-meter and 10-meter 3-DFL antennas. A full-wave horizontal loop for the 80 meter band at a practical height of 15 meters is a popular antenna nicknamed a “Loop Skywire” that has been in The ARRL Antenna Book for years. When I raised the antenna and used a Rig Expert to tune the length I found the 40 m measurement was good for a less than 2:1 SWR across the phone portion of the band. This type of antenna radiates most of its signal at very high angles, which is perfect for using Near Vertical Incidence Skywave (NVIS) propagation to contact stations up to about 500 miles away on the 80 meter band. A few years ago, I acquired a multiband commercial antenna called a half-sloper. I will try to explain in few words how the small magnetic loop antenna works. Each wire of the ladder line loops through the PVC pipe twice to provide strain relief. The distance between one point to another adjacent point in a wave is known as the wavelength. 99 SBL-40 40 Meter Loop - $ 74. Directional Antennas. A second advantage of lowering the antenna to near 1/20th wavelength is a lowering of the background noise level. I have been able to communicate reliably with any station in that area without asking for fills. When winter comes, and 80 meter noise tends to drop naturally, the advantage of the loop often disappears. On 80 meters the loop is clearly the best performer, besting both of the test antennas by at least 2dB overall and by several dB for regional contacts. SBL-160 160 Meter Loop - $159. An adaptive matching circuit at the reader is pro-posed for achieving optimum power delivery performance when. Multiband LOOP antenna made after the design by SP7LA for 80 - 40 - 30 - 20 - 17 - 15 - 12 - 10 meter bands with frequency ranges of 3500kHz to 3800kHz, 7000kHz to 7200kHz, 10100kHz to 10150kHz, 14000kHz to 14350kHz, 18068kHz to 18168kHz, 21000kHz to 21450kHz, 24890kHz to 24990kHz and 28000kHz to 29700kHz with overall length of 82. Most caps - except air and vacuum - have a low Q. Propagation was not favorable on 17 and 12 meters immediately after construction when testing, but a good match was obtained on both bands. This had 4 x 2 inch coils in each corner of the loop with 30 turns of 1mm wire and I stretched the loop all around the garden and even inside the attic to make the loop as big as I could. 84 - Mini-Horse Yagi Antenna. With no tuner 80, 40 and 20 meters read less than 1. AP079 <#”loop-start”: {“type”: “floors”}}#>. No installation is needed: you £1179. This loop which is quite simple and easy to build shown in figure 1. Reference loop, 40-meter full wave loop 36-feet high over medium soil, opened opposite feedpoint to make reasonable feed impedance on 80 meters. W4JRQ "Excellent build quality and service!" KG7OTQ "Made my QRP maritime mobile a real success. Tri-Band Fan Vertical. • Example loop was quite adequate for FT1000; even a half size loop was OK. 3 swr at either end of the band 80 meters at 3. G4ILO describes the Wonder Loop this way, The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. Theoretical impedance of the loop is 100 ohms,. The 40/60/80 is a portable loop that covers 80 meters with a high degree of compromise. If you can get a bit more wire up in your attic than I am able to hang, the open loop might perform as a folded dipole on 80 meters or lower. Parnell, “Use your tower as a dual band, low band DX antenna, QST, Vol. Calibration of Loop Antennas at VLF 1 A. On 80 meters the loop is clearly the best performer, besting both of the test antennas by at least 2dB overall and by several dB for regional contacts. While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. The formula for the length of wire. Here's how. 2 DXE-ECL-060 Element Clamp for 3/4 and 7/8 in. Changing bands is accomplished with the flip of a toggle switch. From Array Solutions comes this control box AS-AYL-4 for assembling a low band receiving antenna in four directions based on the famous K9AY loop concept. This is usually the length where some HAMS may come to the very painfull constatation that the lot or available space to play with antenna's should be much bigger (for an antenna freak, the lot should ALWAYS be bigger). welded, built with tubular elements ø75 x 2mm thickness (2. What follows is a very inexpensive indoor receiving loop which covers both 80/75 and 160 meters.
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