An additional advantage is that the antenna can easily be polarized vertically. This makes the antenna convenient for (DX) long distance connections. Totally fantastic is the fact that the antenna is resonant at half a wavelength or a multiple of this wavelength. This makes the end-fed antenna perfect as a multi-band antenna.
Ran across the hyper dog ball launcher a couple of years ago, and the potential for re-purposed applications as an antenna launcher for hanging antenna supports seemed obvious. It is not as much fun as a pneumatic launcher, but it sure is easily understood by any boy of 8. No air pump required. The modified hyper dog The normal slingshot type Wrist-Rocket/Crossman slingshot launcher has served ...
Elongated Loops and other loop receiving antennas such as K9AY, EWE, and flag antennas, small Topband or HF low noise receiving Verticals, my receiving antennas (with a demo), end-fire or cross-fire Beverages, common-mode noise in low noise receiving systems, and more.
Mar 17, 2019 · Magnetic Loop antennas are amazing performers, especially for their physical size. The capacitors are tricky for tuning and require high voltage types so as not to arc. ... W8JI has much info ...
An additional advantage is that the antenna can easily be polarized vertically. This makes the antenna convenient for (DX) long distance connections. Totally fantastic is the fact that the antenna is resonant at half a wavelength or a multiple of this wavelength. This makes the end-fed antenna perfect as a multi-band antenna.
The results are fantastic..both use a guinella type balun but wound 20t on each of two ferrite cores that are then taped side by side. this and a 1to1 choke on pne of the antennas made from microwave coax and fed with 11mm75ohm coax.. the radiating wire is just 1mm thick stainless steel wire. i have worked 70 countrys in six months including a ...
W8JI A plethora of great antenna types plans & builds plus many other useful topics with explanations & clarification PG1N The mother load of home brew HF, VHF & UHF antennas, single & multi band dipoles plus many others Rhombic termination resistor Termination resistor needs to be near 800Ω Resistors must be carbon resistance - not inductive. Increased parallel resistor stages will increase overall input Wattage.
The lossy, untuned, electrically-small antenna, whether a vertical, loop, or horizontal dipole, turns out to be an excellent transducer for HF skywaves. The efficiency of such an antenna is very low, sometimes on the order of dozens of dB below an isotropic antenna.
loop’s maximum gain angle of 43 degrees, the delta loop has only 5.5 dBi gain. Compared to an inverted Vee dipole, or dipole, the delta loop lowers effective height of the antenna considerably, increasing wave angle; The more compact area of the triangular-shaped full wave loop further reduces the already small gain available from a full wave ...
Dec 04, 2020 · Below you will find a number of parent links to pages that contain content that I reference in my musing. If you find a link that is dead or find one that I have failed to include, please let me know.
For some antenna configurations, especially Yagis with loop or folded dipole driven elements, various NEC limitations make it difficult or impossible to achieve an Average Gain of exactly 1 for a no-loss model.
W8JI A plethora of great antenna types plans & builds plus many other useful topics with explanations & clarification PG1N The mother load of home brew HF, VHF & UHF antennas, single & multi band dipoles plus many others
For a Loop antenna the length also depends on the shape of the loop (Triangle, Rectangular, Square, Round) but start with a full wavelength for the band you wish to work on and tune from there. With a loop antenna I also found that a loop resonant on 40m it will tune up on 80, 20, 15 and 10m but I recently changed to half the size (1 wave ...

Unlike other wire antennas such as dipole or monopole antennas which act as resonators, with the radio currents traveling in both directions along the element, bouncing back and forth between the ends as standing waves, the Beverage antenna is a traveling wave antenna; the radio frequency current travels in one direction along the wire, in the same direction as the radio waves. I have modeled a 30 meter dipole, a Delta loop and a Quad loop (the loops 'hung' in a vertical plane). I have also spent hours reading various posts and web articles on the 2 loop antennas. I am trying to better my situation on 30 meters, my favorite band. Currently I have a dipole at about 38 feet,

A windom antenna is a single-wire-fed antenna which is worked against ground. It's a grounded vertical wire connected to a horizontal portion acting as a top hat capacitance. On the other hand, an OCF dipole is an ungrounded dipole antenna fed with twin-conductor line, either coaxial or open wire parallel conductors.

For operators looking for gain over a standard dipole, the delta loop is an excellent choice (nearly .5 db gain over a dipole). Most of the radiation tends to be on the horizontal components. Thus, of the two vertically polarized (Fig. B & E) -Fig. E would be the top DX performer with more radiated power higher off the ground.

Mar 10, 2007 · The small loop in my table is a six-sided hexagon which approximates a circle. The perimeter is 36' in length, and the loop is tuned with a variable capacitor. I usually use a matching transformer in my loops, just to avoid wasting too much of the inherently small signal. The loop is made of coax, and is built after the shielded loop design.
W8Ji.com ranks # 43,294 in USA. Find Customer Reviews and Ratings of W8Ji.com. Technical resource and information on receiving and transmitting antennas, amplifiers, radios, baluns, for 160 meters 80 meters and other low bands.
Receiving antennas including Beverages and Beverage Antenna Construction, Loops, K9AY, Pennant, Flag, EWE, Slinky Beverage Antennas, vertical arrays, magnetic loop antenna, and terminated loop arrays. Transmitting: Pictures of some transmitting antennas at my station. Most transmitting antennas link from the top of this page. Single articles:
Nov 20, 2008 · receive antenna noise canceling W8JI magic box (also an effective antenna phasing unit). My low dipole's claimed fame was a sunrise QSO with KH2. No other antenna (1100' beverage, vertical array, etc.) could hear the KH2, but he was 569 on the low dipole. 73! Tim K3LR ===== Remembering that I received ZL1RS only on the magn-loop, this post ...
Nov 07, 2010 · Owen – haven’t tried a loop antenna at this location yet. I didn’t get around to finishing the trap dipole and currently have an inverted vee for 40, up at 47 feet. It’s working very well for me – have worked as far away as the Lesser Antilles with 5 watts – almost 4000 miles, so I know this antenna is getting out.
Mar 17, 2018 · Mar 17, 2018 - longwire best feed system long wire antenna. Mar 17, 2018 - longwire best feed system long wire antenna ... Saved from w8ji.com. Long wire antenna ...
Magnetic Loop Calculator v.1.6 by KI6GD It’s a light magnetic loop antenna calculator that run on MS Windows, and allow to calculate capacitor values and voltage based on Loop circumference, conductor diameter, desired resonant frequency and the operating power. Works either in Standard and Metric units, and let you choose on material, and loopRead More...
A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor usually fed by a balanced source or feeding a balanced load. . Within this physical description there are two distinct antenna t
40-10 m OCF antenna layout On 40-20-17-15-12-10 meter models we use a resonance compensator to pick up the 15 meter band not present on many competing OCF antenna products. We have complete OCF antennas and also the impedance transformers and chokes as separate products (see below for various options with and without vertical radiators).
Loop Antenna Fields. It is the energy storage or reactive induction field response within λ/10 distance from the antenna that gives small "magnetic loop" and "electric dipole" antennas their names. Very close to a small loop antenna (but not necessarily near the open ends of the small loop where the tuning capacitor is) the magnetic field ...
W8JI Home: The pages of Tom, W8JI. Lots of good low-band information, especially on receive antenna theory and practice. DX Summit: Perhaps the best known Internet-based Dx spotting page. Keep track of activity and openings. EZNEC: One of the several NEC-based antenna modeling packages. The one that I use. Hard to get along without it. Geoclock
Jun 10, 2018 · On the other hand, W8JI, modeling an 80 meter dipole 80 feet above ground and placing a 5000 ohm common-mode choke between ground and the "balanced" generator driving 1000 watts into the antenna's transmission line, finds that the 5000 ohm choke resistance dissipates 123 watts -- 12.3 percent of the transmit power!
loop, entirely in aluminium tubes (25, 20 and 25 mm. diameter), becomes a solid connected structure as recommended by W8JI. Table 3: The Waller Flag - tweaking detuning capacitance on Tx antenna for best pattern and F/B - Changed wire diameters
Ran across the hyper dog ball launcher a couple of years ago, and the potential for re-purposed applications as an antenna launcher for hanging antenna supports seemed obvious. It is not as much fun as a pneumatic launcher, but it sure is easily understood by any boy of 8. No air pump required. The modified hyper dog The normal slingshot type Wrist-Rocket/Crossman slingshot launcher has served ...
After measuring an unusually high bandwidth of my previous loop antenna, I determined that the capacitor was likely the source of the loss. This was determined by temporarily replacing the capacitor with a homebrew capacitor consisting of two long copper strips each 20 cm long and 5 cm wide, with a large copper sheet laid on top, insulated by a ...
Antenna Delta Loop Links → 75 . Delta Loop antenna 3,5 - 30 MHz, HA3HI 84 m Total Wire Length (L1 + L2 + L3) - 28 m Triangle Length (L1 = L2 = L3) - 10.56 m 75ohm coaxial length: Delta Loops for HF, W5SDC I decided to try a full wave Delta Loop. After using the loop for a couple of days with decent band conditions, I have never looked back.
An antenna loading coil is an inductor placed in series with an antenna element in order to lower the antenna’s resonant frequency. A standard dipole antenna is resonant if constructed with a length of one-half wavelength. A vertical antenna (effectively half a dipole operating against a ground plane) is resonant at one-quarter wavelength ...
Unlike other wire antennas such as dipole or monopole antennas which act as resonators, with the radio currents traveling in both directions along the element, bouncing back and forth between the ends as standing waves, the Beverage antenna is a traveling wave antenna; the radio frequency current travels in one direction along the wire, in the same direction as the radio waves.
Full-wave Loop Sloper Antenna Bonus Band Coverage The 40 meter (7.1 MHZ) full-wave loop antenna will also be resonant on: 20 meters ( +/- 14.2 MHz) 15 meters ( +/- 21.3 MHz) 10 meters ( +/- 28.4 MHz) The sloping loop's radiation pattern will become split in an ever increasing number of side lobes (of lesser amplitude) as you use the antenna on ...
Sooo, in shielded loop the shield is the antenna according to W8JI and worshippers. But you take the shield (W8JI antenna) away, now the wires are antenna, some say don't need no stinkin' shield and "antenna" to work as an antenna. > The rest is just fodder for bored old farts on a newsgroup.
Full Wave Loop Antenna 10M thru 80M G5RV Multi-Band Antenna by Louis Varney Hex Beam 20 thru 10M -- From K4KIO IK-STIC -- multi-band vertical dipole antenna used for quick set-up and quick band change -- From W2IK IK-STIC 2 vertical, all band, antenna, 25 feet tall, under 5 pounds! With a tuner covers the amateur radio HF bands from 40 - 10 Meters.
erful antenna modeling software. 1,2 This soft-ware allows you to design and optimize an antenna that exactly fits your situation and pocketbook. While cut-and-try experimenta-tion is a very slow way to optimize antennas, modeling is so quick that a wide range of so-lutions can be investigated easily. The real
Dec 16, 2018 · Antenna enthusiasts will recognize the call sign W8JK as the inventor of the classic array known as the W8JK flat-top beam. The antenna has unique characteristics that make it popular today and the interested ham can search the internet to find an almost overwhelming number of references for this design.
The loop is a relatively blunt-ended antenna. The "blunt" high voltage areas mute the electric field right where the antenna is most sensitive to such discharges. An open ended antenna, especially an antenna without a large hat or other end termination, has a very strong electric field response at the open end.
Due to the geometry of the balcony, perfect symmetry in the loop construction is impossible, and even if it were possible to construct the loop with maximum physical symmetry, the environmental asymmetry will always unbalance the antenna to some extent.<br /><br />Regarding the auxiliary coupling loop: perhaps one intuitive explanation would be ...
Apr 25, 2010 · For a single loop (not phased) the K9AY is easiest to build, but that doesn't come close to the performance of two loops in end fire, crossfire phased. Look at W8JI's website for lots of info on receiving antennas. Jerry, K4SAV
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computing the antenna resistance for a loop antenna. On page 408, Bailey has Fig. 8-14 which plots radiation resistance (the stuff we build antennas for) versus the loop perimeter in wavelengths. For a square closed loop of one wavelength perimeter, the graph indicates about 50 ohms. Oct 11, 2020 · Helical antennas, which are equivalent to a dielectric rod antenna, Tesla coil high-voltage sources (see picture further on), RF coils for Magnetic Resonance Imaging (MRI), Travelling wave tube (TWT) helices (picture below). What is the problem with other inductor calculators? Tom Rauch, W8JI
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Had I picked a Multiband antenna #5.5, it would likely have been a hex beam, simply because this interesting wire beam works very well as a two-element directional beam on all bands from 20 to 6 meters, and some guys are experimenting with versions for 30 and 40. 5.5 might also have been the one-wavelength horizontal loop fed with open wire ... Jun 12, 2016 · I have used this antenna tuner for years, taking it to Field Day and other than having to tighten some screws and adding thread-locker as well as a bit of lubrication of the moving parts after I got it, it has served me well, (seemingly) capably matching the 300-something foot circumference horizontal "lazy loop" antenna at my QTH that is fed with 450 ohm window line.
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Some Vert. antenna noise theory.. From W8JI's serious lab. Skip the theory and go to the conclusions. You can just go to the answers. Start here. Introduction to Vertical Antennas with buried Radials. In a perfect world, a vertical antenna would be exactly one quarter wavelength long and have a ground system that has NO resistance. Antenna Delta Loop Links → 75 . Delta Loop antenna 3,5 - 30 MHz, HA3HI 84 m Total Wire Length (L1 + L2 + L3) - 28 m Triangle Length (L1 = L2 = L3) - 10.56 m 75ohm coaxial length: Delta Loops for HF, W5SDC I decided to try a full wave Delta Loop. After using the loop for a couple of days with decent band conditions, I have never looked back.
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Turns out that by bypassing the internal (BC-30MHz) LNA, the Loop is actually a good TV antenna.. I did some experimentation using the Loop today and I was surprised to see all sorts of Local TV Channels ( usually the Subchannels e.g 8-1, 8-2, etc) which I never get on cable TV, That turned out to be a very desirable Free bonus - hard to say no ...
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Curtain arrays are a class of large multielement directional wire radio transmitting antennas, used in the shortwave radio bands. They are a type of reflective array antenna, consisting of multiple wire dipole antennas, suspended in a vertical plane, often in front of a "curtain" reflector made of a flat vertical screen of many long parallel wires. Excellent technical article regarding limited space antennas: Limited Space Antennas . Thanks to Tom W8JI for permission to host this article.
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Beverage antenna and Beverage antenna construction. Elongated Loops and other loop receiving antennas such as K9AY, EWE, and flag antennas, small Topband or HF low noise receiving Verticals , my receiving antennas (with a demo), end-fire or cross-fire Beverages, common-mode noise in low noise receiving systems, and more. Excellent technical article regarding limited space antennas: Limited Space Antennas . Thanks to Tom W8JI for permission to host this article.
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The 20 meter antenna is on the top. The antennas are turned by a Hygain HDR-300 rotor. 40 Meter Four-square. We also have a 40 meter 4-square antenna to augment the other 40 meter antennas. It is located at the 80-20 meter vertical location in the map below. Overall Transmitting Antenna LayoutSo read the manual, and W8JI’s articles, and keep your grid current down in the safe range, at all times. The maximum continuous grid current rating for the 3-500ZG is 120 milliamps, but for very brief max-power tune-ups, 160mA probably will not destroy it, but 200mA will.
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W8JI has a more technical explanation, replete math and measurements, with on his web site, but my example should convey the magnitude of the matter. DX-Engineering provides helpful guidance in the user manuals for its receive-only antenna products. Again, a half-acre lot means everything is pretty close together. Apr 9, 2020 - Explore Amos Long (KM4HNL)'s board "ham antennas", followed by 898 people on Pinterest. See more ideas about Antennas, Ham radio, Ham radio antenna.
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With a "loop" like the Pennant balance issues become a real headache, especially if the antenna is elevated above ground with vertical feedline. The transformers I wound have a primary to secondary capacitance of about 18 pF on 160 meters.
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There are different approaches to mitigating noise. Most involve using some sort of receive-only antenna. One popular method is to use an Active Magnetic Receiving Loop (DXE-RF-PRO-1B). These directional antennas are extremely broad-band, easily covering the frequency range from 500 kHz to 30 MHz.
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The Near Vertical Incident Skywave (NVIS) antenna is a half-wave dipole antenna mounted not over 1/8th wave above ground (at the highest operating frequency). While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. Sooo, in shielded loop the shield is the antenna according to W8JI and worshippers. But you take the shield (W8JI antenna) away, now the wires are antenna, some say don't need no stinkin' shield and "antenna" to work as an antenna. > The rest is just fodder for bored old farts on a newsgroup.
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Rig FTdx3000, Antenna Doublet Dipole 7+7 meter with ladder line. 73 de Fabio from Italy HB9CVN Ferdinando 15.3.2020 08:55 3 10 559 JN46ME 1267 antenna: end fed vertical 7.5m long & 12 m high very little QSB IK3OCA Hi all, This is only somewhat off topic I think. As I've been playing with diversity reception with my K3, I started researching using Beverage antennas and found some good info on the web and in my ARRL books. 5 dB: A single vertical antenna (1/4 wavelength vertical and short verticals) 4 - 6 dB: 250 - 400 foot Beverages and Beverage on Ground (BOG) 6 - 8 dB: Array of small loops (flag, pennant, ewe, K9AY, shared apex loop array)
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