A doublet antenna (dipole), cut for 80 meters, will not work on 40 meters because 7 MHz is an even harmonic multiple of 3.5 MHz. The length of a loop best suited for operation on 160 metersis too short for use on the higher bands.The optimal choice is to cut the loop for resonance on the highest band youplan to use, however it becomes difficult to use a giant 160 meter loop on10 meters - your feedline length must not be a fractional wavelength of theband you want to use or else you'll wind up using your feedline as theradiator! Antenna wire can be #14 hard-drawn antenna wire. I decided to install an 40 meter dipole in my attic space which is about 25 by 45 feet, … This is where the standard is set. On 40 meters the SuperLoop 80™ is a 2 wavelength open loop or Bi-Square. In fact, my 80 meter loop antenna could be tuned on 6 of the 8 bands with just the built-in ATU in my Kenwood TS-930SAT. I discovered something called a Beverage-on-ground or BOG antenna. Thanks for your support! 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 … to your neighbors! The stub in the top leg of the antenna opens the loop when operating on 40 meters and selected other bands. Ham Radio operators review new sites every day since 1998, for potential inclusion in the Directory, and to evaluate the best place to list them. Technical assistance provided by Zach. This improves the antenna's … You can use an 80 meter horizontal loop on 20 meters if you feed with open wire line. 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 80M Vertical antenna with capacitance hat Simple wire antenna cheap to make, using readily available materials, Low angle radiation, with rejection of high angle signals Wide bandwidth, with resonance at the 80M … The rest of the antenna wire is pulled down with a rope. That was never happening at this location. The DXZone is the largest human created and maintained library of web sites dedicated to Amateur Radio, currently lists 20.000+ links organized into 600+ categories and subcategories. Magnetic Loop Antenna for 80-20 mtrs by Frank N4SPP. By K5USS. 2B: 3D radiation pattern of a vertically oriented Small Transmitting Loop close to ground (circumference = 0.15 λ, loop center installed 0.04 λ above ground, NEC simulation model adapted by me from Carol Milazzo, KP4MD, ref. Adding an LDG AT-200 Pro autotuner allowed it to be tuned up on all 8 bands.I use xnec2c for m… 1/2 λ dipole (meters) = 142.65 / frequency in Mhz: Full wave loop (feet) = 1005 / frequency in Mhz: Full wave loop (meters… A 40 meter horizontal loop may work on its harmonics. • 10 meters 34.835 feet • 12 meters 40.296 feet • 15 meters 47.349 feet • 17 meters 55.469 feet • 20 meters 70.546 feet • 30 meters 97.185 feet • 40 meters 140.559 feet • 75/80 meters 269.798 feet • 160 meters 528.947 feet Lengths above are in feet and inches. 8G) Due to the closed-loop shape, this type of antenna … And here is SWR over the range of 3-30 MHz: Note that the loop's resonances … 80 meter horizontal square loop Length of a full-wave 80-meter loop is about 270 feet long (1005 divided by frequency in MHz) or about 67 feet per side. The 80 meter loop is really designed for 80M and 40M. The top is 23 meters high and goes to the right to a pole on the roof of the house. Use #12 wire for large loops on 160 or 80 meters. I really don’t have room for a full, half-wavelength dipole, so I’m looking for options. While this loop antenna will not outperform a yagi or a 4 square, it is a decent all-around antenna. I have a antennas optimized for each band … Conditions have … I am really impressed with the signal strength on 80M, and 40M is well above par. With your tuner bypassed, use either an antenna analyzer, or your radio’s SWR meter, and measure the SWR at various points throughout the 80 to 10 meter bands. If you plan to use the loop for 160 meters 99% of the time then cut it for1… The perimeter of the 80 meter loop for 3.625 MHz = 277.24 - (2 x 29’ 10”) [2 x 29.86 feet = the length of both sides of the wire in the ladder line] = 217.52 ft. Let’s call it 217.5 feet. Fig. Phase three was putting up a second loop; a dedicated 80m antenna. The result of both of these design features is an antenna that that is more Efficient than any other manufactured loop on 40, 60, 75 & 80 meters. For a while, I used a W3EDP antenna… When cutting wire to make the Antenna… Join Amazon Prime - Watch Over 40,000 Movies & TV Shows Anytime - Start Free Trial Now, HDMI To RCA Composite Enables Users To Stream With Old TVs, Live Police Scanner Feeds On Your Computer, The Guide to Setting Up Google Chromecast, These Bluetooth Headphones Live Up To The Hype, JBL Charge 3: The Ultimate Bluetooth Speaker, More Audiophiles Using The Transcontinental Studio Microphone. Needed materials are: 60 meters of wire for the antenna; 23 meter … Deployment … Those frequencies where you … Page 1 of 1 Start over Page 1 of … An NVIS antenna is simply a horizontally polarized at a height … – 100W PEP SSB, 50W CW, or 25W for sporadic … © 2021 ON THE SQUID is proudly powered by WordPress - BloggingPro theme by: Design Disease. Dimension "A" is the height of the antenna from the base to the … 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 … 10-80 Meter magnetic Alpha Loop Antenna 10-40 Meters, 100 Watts PEP SSB 40-80 Meters, 20 Watts PEP SSB Customers who bought this item also bought. Ladder line … The Alpha Loop with the Booster Cable installed is a 20 watt (more about that power rating below) 40-80 meter antenna, per the manufacturer’s specifications. Length of an impedance matching section made with 75-ohm cable with a cable velocity factor of 0.80 (foam dielectric): Formulas. 80M Vertical antenna with capacitance hat, 80m Vertical Antenna with Folded CounterPoise, Broadbanding the half-square on 80 meters, Coil-loaded 40/80 Meter Inverted V Dipole Antenna, Antennas for 80 meters band with DuckDuckGo, Find more links about Antennas for 80 meters band with. Just what I would expect to see for a loop cut to be resonant in the middle of the 80 meter band. 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 …
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