The directional quality improves signal to noise ratio of the desired signal while rejecting signals perpendular to the plane of the windings. This will direct more of your output power when transmitting at the same time reducing interference and increasing signal strength when receiving. If this is for receive only, then you don't have to use the big copper pipe. One-turn loop inductance calculation. However, thanks to other hams like Steve AA5TB there are tried and tested designs, calculators & building methods that are known to work and that you can follow. We also sell Quality AM/FM, DAB+, shortwave and longwave radios. Loop antennas (magnetic) are known to accomplish this. Posts about Loop antenna written by azswdxing. PA3GZK's WIDE BAND ACTIVE LOOP RECEIVING ANTENNA. The objective of this article is to disseminate some practical. Loop antennas can have various. I have looked through many resources and calculators to find out how long my AM radio receiver antenna wire needs to be and I am confused at the conflicting information I am getting. Hi Dem & Joe, That's very good information to have and be able to use on the HF Bands. Click Here to see more on transmitting Loop Antennas from AA5TB. The Vertical Loop is a good DX antenna. Assume we have a single turn loop antenna with an area A. So, my goals: 1) have one antenna that would cover 30 through 160 and remove the other antennas. There are two choices for loop mechanical construction - edge wound and spiral wound. One bedroom, two bathroom condo plu…. (OT) MAG LOOP ANTENNAS. Magnetic Loops-- from DJ3TZ Magnetic Loop Antenna-- from HB9ABX. This is a very broad beamwidth for circular polarization; this is one of the features that makes spiral antennas very useful. What he built was above and beyond an MFJ type loop antenna. AM Loop Antenna from MTM Scientific, Inc. Posted by: Joost in Antennas, Projects This article is a reprint from my original article published in 2004. A little loss in signal means nothing on receive. Ferrite Magnetic Antenna for the 160, 80 and 40- meter Bands. Assembling an effective indoor antenna for the HF bands can be frustrating. To be honest I didnt liked much how the layout of the calculator is. I have played around with a small loop antenna calculator. That is a compromise in itself. It's performance compared to the dipole has been very impressive. Since closed loops are not subject to "end-effect" the calculated physical lengths with this formula are longer than corresponding dipole dimensions and are close to free space dimensions. Ferrite Magnetic Antennas by RN3DEK. Note: read ref. STACKING ANTENNAS. INTRODUCTION A previous technical note  presented a number of closed form expressions for a loop antenna in free-space. When disassembled the antenna easily fits in a suitcase or backpack. Loop Antennas for ham radio. AA5TB's Small Magnetic Loop Antenna Calculator ver. 2 HDMI AND IR OVER SINGLE CAT6 WITH HDMI LOOP - FOXTEL IQ2/IQ3 COMPATIBLE. Home-Made Magnetic Loop Antenna for 30 Meters. The prototype was built for indoor use. I have been experimenting with small (generally less then 1/10 wavelength circumference) transmitting loop antennas in the HF bands since the 1980's. The total side to side beamwidth of the antenna main beam. Shielded-Loop antennas have some nice properties that make them desirable as portable receiving antennas. tall by 28 ft. Rotatable Delta Loop for receiving on 160M and 80M. This is where the term “magnetic loop” antenna originates. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. Flag & Pennant - Variations of the terminated broadband loop with floating ground, producing a unidirectional cardioid reception pattern. I was particularly impressed by the stability of Johns amplifier design regardless of the construction methods used. Wheels make a simple low cost horizontal broadbandwidth omni antenna for use at at repeater site. Here are some simple suggestions that may help your project. A magnetic loop antenna is a winding of copper wire around a frame (for air-core loops) or around ferromagnetic material (for ferrite loops). Performance of Transceiving, single-turn, magloop antennas of rectangular shape. Even HDTV! Enter your ZIP code and submit then you can see a list of the stations in your area. For transmitting, I have a horizontal loop antennas along the perimeter of the apartment along the ceiling/wall. Marris, G2BZQ See Feedback, May 1996 QST for corrections to this article. 5m circumference mag loop for 20m-15m. A beveridge antenna would have been ideal however, my backyard is a bit small for that type of antenna. , Moscow Radio 1960, # 1, p. This shortwave receiving antenna has surprisingly good performance considering its. Here is a photo of W2BRI with his 12 foot square magnetic loop antenna. The first one is where I got the ideas, the second one is an online calculator for trying out different scenarios, with input power, loop size, wire diameter, and input power. Two Receiving Magnetic Loop Antennas from. 544' is comfortably resonant at 1. A major feature of my Magloop antennas is the ability to work the whole band without retuning. If the loop. Antenna Toolbox™ provides functions and apps for the design, analysis, and visualization of antenna elements and arrays. Working 160M From a Small Lot (and Larger Ones Too) Jim Brown K9YC [email protected] To determine the length of the line, use this formula. A custom designed capacity hat system allows this vertical monoband antenna to get on 160 meters with unparalleled success in in antenna that is only 55 feet tall. If you need to use it for both the 40 and 60 kHz JJY signals, simply resonate the loop on frequency of the weaker of the two time signals. The directional loop design in combination with the receiver's high pass filtering, greatly reduces unwanted noise and hum. And he was using 4NEC2 as a calculator. This led to a bit of research which resulted in some tools to help better design, build and test a tuned loop antenna. The secondary is the main loop, and is the actual antenna. See the tables and plot below. Department of Commerce Rebecca Blank, Acting Secretary. Delta Loop and other wire antenna calculator. While there are plenty of high performance antenna designs,. Many collocation opportunities. Arm; Body; Hand; Head; To receive an electric wave from all directions :. Plus the antenna also have the great low noise floor and wide bandwidth typical of our other antennas. The loop sensitivity decreases as frequency decreases, becoming a formidable problem below 1 Hz. Salina Security Cameras Direct offers Salina, KS customers. Guy Atkins has compared RF PRO-1A, a new antenna from Pixel Technologies, to Wellbrook Communications' ALA1530 active loop antenna, which has been around for years. This section contains the SNR values determined by SPICE simulations of square loop antennas of various sizes and number of turns. Magnetic Loop Antennas on 3. The total side to side beamwidth of the antenna main beam. DIY 4G LTE Yagi Antenna in 10 Steps for $10 and its shape and placement will affect the antenna's impedance. I restore old military radio's R390 / 51J Collins and have always been disappointed. Hentenna mached loop antenna. As I am primarily interested in using this antenna for DX on 80 m, or 80-40:. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. Here is a photo of W2BRI with his 12 foot square magnetic loop antenna. Log Periodic Antenna Calculator Full Wave Loop Antenna 10M thru 80M -- From Western Canada's Ham Radio YL Site Loops-- From The ARRL Loop Antennas-- Plans for each Amateur Band Loop Antenna Forum-- Yahoo -- Needs subscribing but lots of info here Low Band Antennas-- From K3KY Mac Antenna Master Software Magnetic Loops for HF-- From W2BRI. This antenna consists of a single loop of wire, supported by two wooden cross beams, tuned by our air variable capacitor. Serious 160 M ops have a listening antenna focused on Europe: 45-60 Degrees. 2 HDMI AND IR OVER SINGLE CAT6 WITH HDMI LOOP - FOXTEL IQ2/IQ3 COMPATIBLE. The challenge was design the lightest possible antenna for a handheld operation on the lower bands. I've used this calculator to build a 2 turn loop for 40m using LMR400 coax and an MFJ-19 butterfly cap. Here is a summary of my conclusions: • A better formula for determining the inductance of loop antennas is needed. This is a 6 sided loop antenna. If we have a loop like this with a high feedpoint resistance, over 10-20 ohms, the antenna has very high loss. 6 foot diameter loop using 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. 5m circumference mag loop for 20m-15m. The radiation pattern is a graphical depiction of the relative field strength transmitted from or received by the antenna. Every loop antenna is individually calibrated in accordance with ANSI C63. Or, depending on the location, you could hang the antenna from a ceiling. The calculator determines the size of a simple dipole antenna for a given frequency and the dipole wire diameter. receiving antenna if the test source were also a loop antenna and placed coaxially with, and close to, the receiving loop antenna which is to be calibrated. Add Review ×. Design, Experimenters and HF Antennas. Where to put the loop was the next big issue to resolve. Small loop antennas are defined as loops that have a total wire length of less than 0. The loop does not have to be free and clear outdoors. This is a very broad beamwidth for circular polarization; this is one of the features that makes spiral antennas very useful. First, thanks to Thomas for the information on my amplified receive-only magnetic loop antenna. When actually constructing the antenna, make sure to use a little extra coax, so you can tune it later. Suitable for Ages 8 & Older. This article from a 1963 edition of Electronics World presents a relatively simple to build job that reportedly provides excellent reception. The metal whip would serve as a "top hat" for the helix. Arm; Body; Hand; Head; To receive an electric wave from all directions :. One end goes straight into the rig, often with no feedline, and the other end in the air attached to something as high as you can find. Call (719) 249-7478 for more information. Call 1-800-790-4666 for more information. Loop Antenna for DEGEN- 1103. The noise has reduced a lot and listening to the low bands is not annoying anymore. find a coil calculator on web input wire gauge, number of turn s, form. The Alpha Loop is a 10-40 Meter transmit/receive antenna, which handles 100 Watts PEP SSB, 50 Watts CW, and 25 Watts Digital. When a loop antenna is constructed with a loop circumference that is less than 1/10 wavelength, it is classified as a small loop antenna. The original idea of this circuit is from Nikola Tesla, radiant energy from cosmic rays, This circuit will give you electricity from thin air, the electromagnetic field in free space, if we can tap this electromagnetic energy and convert it into electricity power, we will have free electricity from this tapping process. CIAO Radio Loop Antenna L-101 0. Last month, law makers rejected a June request by the treasury to remove the cap, saying lenders have not proven they could. Even HDTV! Enter your ZIP code and submit then you can see a list of the stations in your area. Best to have 2 antennas to compare signals! Devote at least a year to test antenna before giving up on an antenna. 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. The loop antenna comes in an amazing number of configurations. The impedance across the tuned loop at resonance is computed. Left my green coloured loop as distinctive "bush" in my garden and on the right in PA3GZK's garden his trial model as described in this article. 2004 OH7SV XL = XC (ohms) Distributed C (pF) Tuning capacitance (pF) Radiation resistance (ohms) Loss resistance (ohms) Efficiency. 87 - Capacity Tuned Folded Loop Antenna for 20m. Check out all the great FREE TV you can get with a good digital antenna. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. There is nothing really critical about the construction or symmetry of the antenna, but it is helpful to take the time to orient the loop in such a way that the receive nulls, which are broadside to the loop, are facing the most likely sources of noise. Loop Antenna Impedance Before we address the design of remotely tunable matching networks, we need to gain an understanding and appreciation of the imped-ance of loop antennas, the nature of which pre-cludes the design of wideband matching net-works. The generator output was fed to a loop antenna, while the investigated receiving antennas were placed in the axis of the loop antenna at a defined distance. This video by Ricardo Caratti demonstrates his method for controlling a Magnetic Loop antenna with an Arduino. Scanning & Receiving Antennas; Avionic Antennas (Radar/SBS/AirNav) HLP-4 70MHz 4M Halo Loop Folded Dipole Antenna. I will try to explain in few words how the small magnetic loop antenna works. It is concluded that air-core bandolier loop antennas, and erhaps ferrite-loaded loop antennas, having peak transmit moments of about 2. A little loss in signal means nothing on receive. A practical guide to making DX performance magnetic loop antennas for 160-40m. internal tuners - no antenna changes are necessary. If you are looking for an HD FM antenna, Winegard HD-6010 HD FM Radio Antenna is a great option. Loop Antennas. The three graphs here below show the SNR values (vertical axis, in dB) against the number of turns (horizontal axis). An upgraded version of our HDC6EDID. 2 Diesel 2019 | Sale Ford Search. In this article, W0BTU's Beverage antenna is 580-feet/176. Particularly for those with space and/or budget limitations. This antenna is not a substitute for an 80 acre Beverage farm, but if you are on a small lot and are plagued by power line or other man made noise this receiving loop will improve your receiving capability on the low frequency bands. Under the condition of optimal orientation and polarization, the maximum power that can be obtained from a receiving antenna is proportional to the power density of the plane wave incident at the receiving location. The radio operates on AC from the built-in power adapter or six D cells (not supplied). 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. This is a type of antenna known as a box loop that is very useful for AM broadcast DXing. I've got a Project to do using a Magnetic Loop Antenna for a friend who is down on his luck and the 44" Loop Diameter would do the trick since it covers 160, 80, 30, 40 & 20 m. This will direct more of your output power when transmitting, while at the same time reducing interference and increasing signal strength when receiving. An In-Room, 80-Meter Transmitting Multiturn Loop Antenna A little wood, some wire and a handful of components can make a directional antenna for indoor use where outdoor antennas are not permitted. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. This led to a bit of research which resulted in some tools to help better design, build and test a tuned loop antenna. Use this online calculator to determine the length of a full-wave loop antenna from the frequency. The possible exception is between 20 and 200 miles. A little loss in signal means nothing on receive. The loop antenna comes in an amazing number of configurations. A remotely-tuned loop receiving antenna for LW and MW If your only knowledge of suburban Maryland comes from seeing the movie The Blair Witch Project, you probably think Maryland is a vast wilderness where it would be easy to pick up longwave broadcasts without interference. Here is a little twist on my loop designs. In part one of this series, I covered the use of one brand of commercially available, small transmitting loop antennas, also known as 'magnetic loops'. com), fiberglass poles by Max-Gain Systems (tnx to Allen Bond of MGS). by Chris Ridley. The Addwards A38-LMS is an active (amplified) Loop Antenna covering SW/AM/LW bands selling currently for $17. Multi Turn Magnetic Loop for 40/60/80. Increase your range by selecting Cushcrafts dual band Yagi. The model used here corresponds to a non-tuned antenna working in current. 779kHz and 29. Very small receiving loops are practical for good reception on the LF and VLF bands but physical size inhibits the use of high power efficiency transmitting loops (as decribed in this article) for LF and VLF. Most of these standards allows the use of broadband antennas such as biconical, log periodic, Loop, Combilogs and horns. This will direct more of your output power when transmitting, while at the same time reducing interference and increasing signal strength when receiving. The G3XGC Receiving Loop revisited My comments to this design: Although this antenna does not come close to the overall bad design published years ago in the ARRL Handbook:. • Most antennas are resonant at only one. On my list of new antennas to experiment with is a magnetic loop with a broadband current amplifier in lieu of the usual resonating components. If there's no room for a Beverage antenna For receiving, a Beverage is simple and easy and very good. Usually, aperture antenna consists of Dipole or Loop Antenna in a guiding structure with an opening to emit radio waves. The optimized terminating resistor was 486 Ohms (for best F/B, average soil). The rear panel has extensive antenna inputs. You can use both for gain. Call 1-800-790-4666 for more information. In order to understand how and why circuits exhibit unintentional electromagnetic emissions, it is helpful to review a few general concepts related to electromagnetic radiation and antenna theory. 2 Home Made HIGH POWER Magnetic Loop. These antennas are perfect for packet applications. Note that antennas are very rarely constructed according to the calculated theoretical dimensions and are always tuned to the lowest standing wave ratio (SWR) and. In order to use it, it is almost a necessity that your radio provides a separate receive antenna input jack. If you would like to contact the WV Section Manager, Dan, K8WV, please send an email to his callsign at arrl. CB4M is an electronic unit designed to remotely tune magnetic loop antennas. 2F for caveats about mag loop calculators. I need to include a receiver antenna in my SPICE simulation. I like to build things that look nice around my house (or someone else's house). A phasing harness is basically (2) sections of 75-ohm cable cut to odd quarter wavelengths X velocity factor, transitioning to a 50-ohm cable, which is usually the transmission line. Degen TG39 MW "Classic" Loop Antenna. This antenna is my version on 40/60/80 originally designed by HB9ABX Felix Meyer. Don’t close out the week without taking a quick look at this list of all our posts from the last seven days. These antennas represent a radical departure from previous attempts to design a horizontally polarized omnidirectional antenna. The generator output was fed to a loop antenna, while the investigated receiving antennas were placed in the axis of the loop antenna at a defined distance. the target (i. Multi Turn Magnetic Loop for 40/60/80. View pictures, specs, and pricing & schedule a test drive today. The cover slot holds User Guides. The aim of any receiving antenna is to convert an electromagnetic wave into a voltage. The magnetic loop antenna is a small circular antenna that can operate on multi-band like 40m to 20m, 20m to 10m, and even tri-band, 40m to 15m. Delta Loop is a three-sided antenna suspended high in the air by vertical supports, such as tall evergreen trees. All home brew, designed by Earl Cunningham, K6SE ([email protected] The Dipole vs Indoor Magnetic Loop Antenna May 12, 2017 Julian OH8STN Ham Radio 0 These days it seems like everyone and their mother is attacking the very popular, small, lightweight, and extremely portable, magnetic loop antenna. Magnetic Loop Antennas for The Radio Operator with Limited Space pt. Describe your experience with the Wellbrook ALA-1530 Active Magnetic Loop Antenna and tell us why you give it the rating you did (required). If placed horizontally they are not. You can work the whole band with a 1. It is the simplest antenna, which provides circularly polarized waves. There are questions about how effective a low measuring point is, because receiving heights close to ground level are highly effected by nearby objects, including the people doing the measuring. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. This calculator will help you to calculate the different wavelength of antennas based on the frequency. PK's Loop Antennas. One solution for an indoor shortwave antenna is a magnetic loop antenna. Since the reflection point is typi-cally from a few kilometers to tens of meters away the ground immedi-ately below the antenna does not affect elevated antenna. KCWX is listed as having applied for channel 8 in your area if they actually have that one on the air it should not be a problem to receive. Center Frequency: 1. We feel that the W4OP LOOP antenna is the BEST Loop Antenna on the market and like all LNR's tagline, W4OP Small Transmit/Receive Loop PRECISION MADE. Log Periodic Antenna Calculator Full Wave Loop Antenna 10M thru 80M -- From Western Canada's Ham Radio YL Site Loops-- From The ARRL Loop Antennas-- Plans for each Amateur Band Loop Antenna Forum-- Yahoo -- Needs subscribing but lots of info here Low Band Antennas-- From K3KY Mac Antenna Master Software Magnetic Loops for HF-- From W2BRI. Lionel 6-12028 FT Inner Passing Loop Track Pack O. The small loop as a receiving antenna. All loop antennas work with ground-wave signals, which reach the antenna horizontally. What is multi-turn Loop Antenna? - Electronics Components Symbols - Multi turn loops Antenna are often used as low frequency receiving antennas. The second area in which a long wire loop offers advantages is in azimuthal coverage. I have no space on my city lot for a K9AY Loop or a Beverage antenna. By Joseph Carr This guide to high performance antennas is written in Joe's clear, easy to understand, friendly style. loop antennas, there are a few new ideas to grasp. A mag loop has one advantage and that is to null a low angle noise signal. Another common planar spiral antenna type is known as the Archimedean Spiral antenna. John Jacobs, host of the Field Radio Podcast, returns join in a discussion of basic DIY HF antennas. 150 feet of #20 guage solid wire. NEED HELP GETTING CONNECTED? Before returning any antenna to the store, let us help you get your new antenna set up. I used four radial wires to test the antenna system. Call 616-452-5101 for more information. 6 foot diameter loop using 1. So, the loop diameter should not exceed about 1 mtr (≈3. To build a "Morris Com Loop", we essentially take one of the square elements of a quad antenna, round it into a loop, and install it inside a composite tailcone. Many configurations exist when constructing the main loop and secondary loop. This calculator will help you to calculate the different wavelength of antennas based on the frequency. 1uF capacitors from the supply line to the collector resistors of the two transistors and 100K resistors to dissipate any static on the loop. it is half of the dipole antenna. 1 The discussion of loop antennas is conveniently divided according to electrical size. ANTENTOP- 01- 2013 # 017 Two Receiving Magnetic Loop Antennas Twin Magnetic Loop Antenna Dobrynin I. By entering the height and width of your loop (36 or 48 inches each if building as per above) and the number of turns and distance between turns (I use 0. This was the calculator used to arrive at the gain figures of the competitor’s loops. Antennas are specifically designed to transmit/receive as much electromagnetic radiation as possible, whereas most circuits are designed to emit/detect as little as possible. The formula for a calculating the length of a full wave loop antenna is: Length (feet) = 1005/f MHz. Tuning around it was clear that the loop was receiving just about everything my main antennas could hear. Aside from that, there is the Sony AN-LP1 Active Loop Antenna, which. From what I can tell, there isn't any difference between a square and a hex loop besides the shape. This experiment is about testing a small "magnetic" loop on 630m. One is the cheaper Degen 31MS, which is made with a soft wire loop, is about AU$30 but looks flimsy with a touchy tuning wheel and mixed reception. INTRODUCTION A previous technical note  presented a number of closed form expressions for a loop antenna in free-space. LF/MF Operating Modes. 60kHz is in the kilometer band. I was particularly impressed by the stability of Johns amplifier design regardless of the construction methods used. This antenna works great on the AM band because of the properties of these. Radio Frequency Interference and Antenna Sites How much spacing to you really need between antennas at radio sites? Collocation and Antenna Spacing Myths After many years of resistance by wireless licensees, collocation or sharing of antenna sites has recently become a common network buildout strategy. Loop conductor length (m) Feeding loop diameter (m) Frequency (MHz) Inductance (uH) Capacitance (pF) Main loop diameter (m) Conductor diameter (mm) Magnetic loop antenna calculator for round copper construction 1. Helical Antenna Design Calculator. Masts higher than 12 feet above the roofline may be subject to local restrictions. The Antenna was built within 3 hours and can be deployed / errected within 20 minutes. I have been experimenting with small (generally less then 1/10 wavelength circumference) transmitting loop antennas in the HF bands since the 1980's. Loop Experiments – Antennas for the MW band DXer. This link is listed in our web site directory since Wednesday May 2 2007, and till today "Loop Antennas and Calculator" has been followed for a total of 14220 times. Loop Antennas 5-3 tennas for 1. A beveridge antenna would have been ideal however, my backyard is a bit small for that type of antenna. Notably, I have used the following calculators (see below), on top of my own calculations and they do not match. ) shielded loop made out of co-ax cable. net –Drill more holes for antenna wires –Loop antenna wire through holes,. You can use both for gain. 143 Antennas Manufacturers Companies in the United States. Both metric and English units of measurement are supported. The on-chip up- and down-conversion includes the mixer, voltage-controlled oscillator with multiplier and phase-locked loop (see Figure 3 ). Browse our available products today in Salina, KS. Ferrite Magnetic Antenna for the 160, 80 and 40- meter Bands. antenna array to receive both electric and magnetic field components. Free Online Engineering Calculator to find the Dimensions of a yagi Uda Antenna for a given Frequency Range and Length. My Magnetic Loop Antenna. Working 160M From a Small Lot (and Larger Ones Too) Jim Brown K9YC [email protected] 6pf, and around a 50% efficiency. This calculator uses a "K" multiplying factor value of. Like most antennas it is cheap. 82 meters long, coaxial cable-fed at the receiving side with a simple matching transformer, and terminated with a resistor at the far. loop antennas, there are a few new ideas to grasp. 90 meters radial wires. That is a compromise in itself. The total side to side beamwidth of the antenna main beam. The EIRP can take into account the losses in transmission line, connectors and includes the gain of the antenna. i NTIA TM-13-489 Antenna Models For Electromagnetic Compatibility Analyses C. This page allows you to calculate the difference between two times. An upgraded version of our HDC6EDID. There are really only three antennas of this type available that cover 2200 meters to 30 meters (135 kHz to 20 MHz) with no tuning or other adjustments. Ferrite Magnetic Antennas by RN3DEK. Resonant Loop Antennas is a curation of 68 resources about , KE4UYP One wavelenght loop antenna, Horizontal Loop Antennas, W1TAG LF Receiving Loop, ARRLWeb: Loop Antenna, Multiband Horizontal Loop Antenna. Note that on this antenna an A suffix indicates 150-160 MHz, B=155-165 MHz, C=164-174 MHz and E=138-150 MHz. Small loops are used in radio direction finding, and in ordinary DXing for receiving weaker stations in the presence of strong. 5 percent "for ordinary loop shapes". A magnetic loop is one in which the current amplitude is constant round the circumference, and it is therefore small enough to avoid a significant standing wave in the current distribution. For simplicity we will start with a single turn loop. Like K9AY, this antenna is less sensitive to common mode current problems than an usual flag or pennant antenna. The original Dominator NWE-34 is the only non-directional high gain FM broadcast antenna recognized by the FCC and Industry Canada. Now For Sale: 27 Photos • 1 bed, 2 bath, 1,140 sqft condo at 195 North Harbor Drive • Breathtaking views of Navy pier, city and lake. I have a unused hula-hoop in my garage, and I ran some stranded speaker wire around it once, and attached one side of the wire to the coax shielding, and the other to the coax core wire. Hence the addition of ground plane elements. Its performance is similar to the loop in Florida. Friis equation is useful. CB4M is an electronic unit designed to remotely tune magnetic loop antennas. Tuning around it was clear that the loop was receiving just about everything my main antennas could hear. Shielded-Loop antennas have some nice properties that make them desirable as portable receiving antennas. Any feedback would be greatly appreciated. The 30 m high antenna distances are also shown (dashed lines) for 90 km and 500 km high ionosphere. The loop receiving sensitivity with respect to a highly efficient antenna such as a 1/4-wave vertical is shown in decibels. Since a good loop antenna will have a high Q factor, this capacitor must be variable and is adjusted along with the receiver's tuning. Here is a link to a multi-turn loop calculator: https://comtech. To date my favorite portable vertical loops are full or 3/4 WL (See note 4 and 5. Check out all the great FREE TV you can get with a good digital antenna. This means that if the base wire of the antenna goes from north to south, the direction of gain will be east and west. Reply Delete. A magnetic loop is a loop which is, compared to the wavelength, very small. Headphones work better and I can hear 8 stations in the Los Angeles area at low volume.