Hourglass loop antenna. Vertical long rectangle has more gain than ordinary square loop and has less impedance. ” It seemed simple enough to build, and I even went so far as to purchase and cut to length two pieces of PVC pipe to Hentenna Basics 1. Sunday, June 23, 2019 KE4ERO's Hourglass loop antenna for VHF/UHF Every month the ARRL's QST magazine makes one article free to read for non-members. We are happy to introduce our first custom designed, fully calibrated, near field antenna at the right price. 8 to 5. The hourglass form factor yields an antenna that is tall but with a tiny footprint and that doesn’t look like any other type of antenna, which might make it stealthier in some applications. i. I use it on 144 MHz WSPR with some great results. Horizontally Stacked, it drops to 40-deg at 470 MHz, and 30-deg at 698 MHz (to within 10-deg resolution). HenTenna), Circular Loops, Figure-8, Hourglass, Quad-Trapezoid, Shorted-Bowtie-Loops (SBL), Bowtie-In-Loops (BIL) and Dreamcatcher, et. ELEMENT SET, 2MXP20 FM SET $112. On The hourglass form factor yields an antenna that is tall but with a tiny footprint and that doesn’t look like any other type of antenna, which might make it stealthier in some applications. The 10m band delta loop follows exactly the same design principles as all the other delta loop designs I’ve already put on the website. We fine-tuned prototypes and experimented ideas for more than 15 months. Ch3-6 Optimized Hourglass-Loop Antenna (with NO Reflectors) analyzed using 4nec2, with somewhat higher SWR on Ch2 and FM Band. This is as much as a two-element Yagi has while being much easier to build and adjust (see Ch2-6 + FM Hourglass Loop analyzed using 4nec2 after finding "best" dimensions using nikiml's Optimization Scripts. How the Loop Works Explore a variety of online antenna calculators for designing and calculating antenna dimensions. The exact length for resonance depends on the diameter of the conductor and the shape of the loop, but typically it is slightly longer than a 10M Delta Loop This is a 10m band delta loop design that I’ve put together as requested by a member of the Wire Antennas for HF group on Facebook. This is as much as a two-element Yagi has while being much easier to build and adjust (see Explore the advantages of loop antennas and learn how to build one for improved performance in local communication. As described with the feed point in the middle of the bottom side, they are horizontally polarized. Be sure your feedlines and antenna hardware can handle the power. NO REFLECTOR RODS: Ch3-6 Raw Gain = 3. analyzed using 4nec2 Date (s): July 15, 2009. The Hourglass Loop Antenna So being one who likes to build antennas, here is what I came up with. 99 Compare Choose Options 2M4, 144-148 MHz $205. To my knowledge, nobody else makes a 10 The Hourglass Loop Antenna Build this simple VHF/UHF bidirectional antenna from readily available materials. Loop antennas can be divided into three categories: Parts for the 2m Hourglass Antenna 74” (or more) 3⁄4 inch PVC conduit 2 16”-17” pieces of strong plastic or fiberglass (one 48” plastic step-in post should work—cut to length) 169. How the Loop Works The hourglass antenna looks like a great design for horizontally polarised VHF operations in SSB, CW or digital modes. 4 × 1. In the real world — where you build your antennas — the actual impedance of your wire antennas will depend on several variables. Ch2, Ch3 and Ch6 Hourglass-Loops with Multiple Reflector Rods analyzed using 4nec2 after Optimization using nikiml's Python Scripts. 5dB. 041 mm ³ and an aperture area of Gain and Directionality Compared to the 1-wavelength horizontal loop, which also has a 50 Ω feed-point impedance when the vertical sides are twice the horizontal sides, this antenna has an additional 2. ca forum. I hope the calculator helps you with the logistical part, and gets you thinking about the engineering part. 29” 14g aluminum wire 2” 16g stranded copper wire D eciding to put up a loop antenna can be more of a logistical problem than an engineering problem in the initial phases of your project planning. Charts presume AWG8, but there is very little change between using AWG12 or 1/2-in Copper Tube. HCDX Special, April 2002 Updated January 2003 The concept of the "Hula Loop" came after many years of building medium wave loops of varying size, shape and performance. These are tall and thin with an insulated crossover in the middle, making a kind of hourglass shape. height above ground, proximity to large, especially metalic, objects, and proximity to other resonnant antennas. Link to the article in QST. Sometimes it's called the Single Hourglass Antenna (SHA). An UHF Hourglass-Loop has a VERY WIDE Beamwidth of 80-deg at 470 MHz, decreasing to 70-deg at 698 MHz. 1 It provides useful gain with very simple construction. 1 - 45 of 45 Total Monday, October 21, 2019 Hourglass Loop Antenna for 144 MHz SSB and WSPR Described nearly a year ago in QST I finally got around to building one. They range anywhere from $300 to $500 according to advertising on the Internet and in catalogs. L1 works as 1 loop antenna 3. The loop consists of a 2-wavelengthlong A very simple but very good bidirectional horizontally polarised loop antenna for VHF. Ch2, 3 & 6 Hourglass-Loop Antennas with 5 Reflector Rods (RR) analyzed using 4nec2: AWG8 Elements and 1/4-in O. a) Ch2 AWG10 Hourglass-Loop with 3 Reflector Rods. See K4ERO's article The Hourglass Loop Antenna Build this simple VHF/UHF bidirectional antenna from readily available materials. 7. Understand their usage, advantages, and key features. In this article, rather than show you a built antenna system, I’ll run through some of the ways I’ve used to get loop antennas working well, without relying on the wire lengths in the EZNEC models which in practice are not accurate and don’t work well in real-world builds. You could Jan 9, 2026 · Build the KE4ERO Hourglass Loop antenna for VHF and UHF. Wire Size is NOT critical for Hourglass-Loop. You have to adjust geometry to get maximum gain or best match to the coax. John Stanley, K4ERO This horizontally polarized antenna is an extension of the horizontal loop antenna featured in The ARRL Antenna Book. L2 works as matching section 4. How the Loop Works Gain and Directionality Compared to the 1-wavelength horizontal loop, which also has a 50 Ω feed-point impedance when the vertical sides are twice the horizontal sides, this antenna has an additional 2. Texas Instruments (TI) reserves the right to make changes to its products or services or to discontinue any product or service at any time without notice. For best performance on OTHER than Ch6, multiply Dimensions by Rescale Factor F = 85 / (Rescaled Freq). Loop antennas are primarily used to measure the magnetic field strength at lower frequencies. You could add a second identical loop to the other guys, and in this way have a choice of radiation pattern direction (the loop has a roughly cardioid pattern). Visit us online to see why the proof is in the loop. digitalhome. 214 dBi for an compact antenna with a dimension of 20. When I got back on the air in 2002, 10m was in pretty good shape, when I ran across the article, “A Gain Antenna for 28 MHz. Comprehensive guide on antennas used in EMC test, covering biconical, log-periodic, horn, and loop types. Looking for a wire antenna that’s inexpensive, easy to build, and works great for DX above 40m? A delta loop and its variants can make an effective single-band or multiband […] The hourglass form factor yields an antenna that is tall but with a tiny footprint and that doesn’t look like any other type of antenna, which might make it stealthier in some applications. 99 A practical guide to Loop on Ground (LOG) antennas, explaining how they work, why they excel in noisy and restricted environments, and how to build and optimize one for HF reception. There are a few disadvantages to this method of construction: A. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Systems manufactures a wide variety of EMI loop antennas in the frequency range of 20 Hz to 30 MHz. Here is a great design and build instructions for a nice 2 meter SSB loop antenna. Find tools for building log periodic, vertical, Yagi, loop, and more antennas. HO Loops produce an omnidirectional, HORIZONTALLY polarized signal ideal for mobile and base operations. Sometimes it's an antenna article. Definition A full wave loop is, as the words imply, a continuous loop of wire or other conductor approximately one wavelength long, usually with the two ends of the loop connected to the feedline. holl_ands | Home > Loop Antennas incl Folded Dipole Loop Antennas incl Folded Dipole Folded Dipoles, Tri-Folded Dipoles, Square Loops (incl. Theory of Full Wave Loops last updated 28 November 2023. 2 Meter Halo Antenna by Mike Fedler N6TWW has the detailed instructions on his site. 5 dB of gain. This is as much as a two-element Yagi has while being much easier to build and adjust (see I used two lengths of PVC pipe to form the horizontal elements of this simple, 10m loop antenna. The Single Hourglass Antenna (SHA) Design: For the horizontal “elements,” I used 450 mm… Nov 10, 2018 · In "The Hourglass Loop Antenna" (QST December 2018, pages 35-37), John K4ERO describes the construction of two-wavelength wire loop antennas for three VHF/UHF bands. You could probably use it to support a banner or as a plant trellis, festooned with artificial plants. Winegard and Antennacraft have both discontinued their 5 & 10 element VHF-Hi yagi antennas. UHF Horizontally Stacked Hourglass-Loops with 15 Reflector Rods analyzed using 4nec2 where nikiml's Python Optimization Scripts were used to Optimize dimensions of the HHH (Hollands Horizontal Harness) and Separation between Hourglass-Loops. This first model is called RFEAN25 and is a very sensitive, compact and easy to use H-loop near field antenna. Its vertical shape makes it easy to fi Try a folded dipole antenna made from 300 ohm twin-lead in the attic. The Image below shows the materials you will need to build a 2 meter Dive into the fundamentals of loop antennas with our detailed analysis of their theory and applications. This is as much as a two-element Yagi has while being much easier to build and adjust (see A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor, that for transmitting is usually fed by a balanced power source or for receiving feeds a balanced load. Usually these loops are constructed on a square wooden frame, with wire being wrapped around the periphery. The drawback of most commercially available loop antennae is the price. Thus, the bidirectional gain is very close to 7 dBi, or about 5 dB more than a dipole. 5 MHz $143. Gain and Directionality Compared to the 1-wavelength horizontal loop, which also has a 50 Ω feed-point impedance when the vertical sides are twice the horizontal sides, this antenna has an additional 2. The antenna's feedpoint impedance varies considerably as the band is changed; a wide-range antenna matching network will probably be required. Basically 1 1/3 WL Loop antenna around outer edge of antenna 2. 95 Compare Add To Cart 2M HO LOOP, 144-144. Reflector Rods. The carefully designed multi-stage low-pass and bandpass filters provide the best selectivity, and the built-in medium wave and f Antennas Direct is the home of the world's most comprehensive and powerful line of TV and HDTV antennas. Another meter increase adds another 1. As Calaveras said, 2 and 6 are very strong, but so is the noise level from electrical interference on VHF-low (2-6). An hourglass loop antenna for 2m SSB/digital modes Ideal where you want an extremely narrow but horizontally polarised bidirectional antenna with a little gain. It's very tall and skinny. You could probably use it to support a banner or as a plant trellis, festooned with artificial plants⁴. Based on UHF Hourglass Loop posted by oneolddude in www. L2 helps the matching and low angle radiation. The new 432 HO Loop provides easy SSB, CW and now ATV communications out to 200 miles or more. TI provides customer assistance in various technical areas, but does not have full access to data concerning the use and applications of customers’ products. Includes a detailed dimension table for 144 and 432 MHz, material lists, and ham-friendly tuning tips. D. Sep 7, 2023 · The hourglass form factor yields an antenna that is tall but with a tiny footprint and that doesn’t look like any other type of antenna, which might make it stealthier in some applications⁴. e. Cut a 1-in wide hole in the middle of the 15-in long "Feedpoint Gap" to attach 300:75-ohm Balun Transformer. al. Designed by KE4ERO, this is a novel antenna for VHF and UHF bands. With some great results. Loop antennas are a practical and versatile solution for transmitting and receiving radio signals in compact or noise-prone environments. For best performance on OTHER than Ch3, multiply Dimensions by Rescale Factor F = 63 / (Rescaled Freq). The Three Loop Antenna plays a critical role in EMI/EMC testing, offering a unique design and excellent performance, making it an ideal choice for electronic device radiation testing. Built by shaping conductive wire into a closed loop, these antennas operate by interacting with the electromagnetic fields around them. The antenna loop is carried on one of these 15 metre lengths, tied to it with tape or cable ties. The proposed antenna, designed using a modified hourglass-shaped aperture, offers a gain of 8. H. Context in source publication Context 1 all other parameters constant, the same antenna is redesigned with different slot shapes like H-shape, bowtie, hourglass, and modified hourglass. . It takes me forever to complete some projects. Raising the loop just 1 meter increases the gain at the zenith by 2dB. Horizontally Stacked UHF Hourglass-Loops (NO Reflectors) analyzed using 4nec2. Two versions are presented here Description:This is a newly designed full band antenna with a wider operating frequency of 500K-1GHz (supporting DTMB digital TV signal reception) and continuously adjustable gain of 0-30DB. Polarization is horizontal. There are a number of loop designs out there, and to distinguish this one, I’m going to henceforth refer to this loop as in the title above: the Noise-Cancelling Passive Loop (NCPL) antenna. Their design, whether small or large, horizontal or vertical, greatly influences performance, directionality, and signal Explore the world of loop antennas, their types, working principle, advantages, challenges, and applications in modern communication systems. The gain at 45 $^\circ$ elevation increases at about half the rate of the gain at the zenith. The small size of these loop antennas has the advantage of convenience in handling, availability of a zero- response orientation, and a simple expression for the voltage produced by a given field The radio antenna is switched between the loop coupling coil, or an external antenna and ground. Ideal if you want a horizontally polarised antenna in a tight space with a little gain. For best performance on OTHER than Ch2, multiply Dimensions by Rescale Factor F = 57 / (Rescaled Freq). How the Loop Works Ideally, a loop antenna is designed to be portable, easy to assemble, small enough to use when camping or operating in remote locations, and able to cover several bands. This page explains the loop antenna and provides a calculator based on the loop antenna formula. All dimensions were determined using nikiml's Python Optimization Scripts. We’ll cover how to use the calculator and the formulas behind it. It's lightweight and can be set up quickly. How the Loop Works The hourglass form factor yields an antenna that is tall but with a tiny footprint and that doesn’t look like any other type of antenna, which might make it stealthier in some applications. John Stanley, K4ERO This horizontally polarized antenna is an extension of the horizontal loop antenna featured in The ARRL Antenna Book. I was planning on using a combo 10 element and Solid Signal HBU 91 on a few installs I have lined up (due to gain, cost and compactness compared to a full combo). The other switch is a high low band switch and adds a 300 pf capacitor across the 365 pf variable capacitor. RECTANGULAR & SQUARE LOOP GEOMETRY DETERMINS ANTENNA IMPEDANCE Wire length is equal to one wavelength for resonance The shape of the loop determines the impedance of the antenna All are feed with coax at the bottom of the loop. 4 dBi and SWR Under 2. 4 × 20. 6 days ago · Another simple yet effective VHF antenna which can be used in the SOTA challenge for 2026. ddat, 3dkj7, czlfc, alww, rpkzo2, v9ntl, 1mhs, 1ith8, gjv4, rtcn,