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. The entire book is freely available in pdf 2up format, and in pdf 1up format. Design of a ferrite rod antenna for harvesting energy from medium wave broadcast signals. A portable long wave loop antenna 127 khz to 452 khz by on4ei.
Guy atkins has compared rf pro1a, a new antenna from pixel technologies, to wellbrook communications ala1530 active loop antenna, which has been around for years. Loop antenna design and construction, magnetic loop antenna. Loop antennas can have a circular, square, rectangular, hexagonal or octagonal shape. This can be possible by open circuited long wire or unterminated, so called stand wave antenna. They confirmed that the types of people who buy the.
Magnetic ferrite rod antennas for longest wave, long wave, medium wave, short wave plugon professional neutrik plugs for 14 jacks and direct finding power magnetic ferrite rod antennas for the reception booster bazvm2 in the frequency ranges 20100 khz very long wave and long waves. Design of a ferrite rod antenna for harvesting energy from. Antenna tuning unit via medium wave eeweb community. The maxima direction oriented with the direction of wave in the wire, so by introducing wave on both the direction we can introduce bidirectional radiation. When the height of the transmitter antenna operating at these frequencies is small in comparison with its wavelength. It is even possible to use the shielded loop antenna to completely null out the groundwave radiation on a local medium wave broadcast station and listen to it via its ionospheric echo during the day. Small loop antennas are used mostly on the lower frequencies. Hf antennas for small gardens itchen valley amateur. The wellbrook medium aperture loop ala100ln is a specialists antenna designed for the long wave, ndb band, medium wave and short wave dxer. Us medium wave pattern references amateur radio station nf8m. Medium wave circle receiver shopping list receiver. Am radio signal booster the radiolabs an200 am antenna is a beautifully designed loop antenna for enhanced am or medium wave reception. The loop unlike other loop antennas on the market actually not only works well but also.
Communications, antenna, radar, and microwave engineers must deal with the generation, transmission, and reception of electromagnetic waves. At medium frequencies, during daylight hours, skywave signals propagating via the. Review and analysis of medium wave directional antenna sample. Magnetic ferrite rod antennas for longest wave, long wave. Sony an1 radio antenna on medium wave more adventures in improving am broadcast radio reception. Propagation in the night allows strong signals within a range of about 2000 km. Passive antennas do not suffer from amplification effects but provide lower signal levels. In order to get the most out of the antenna factor, those with sufficient real estate will erect a ewe, beverage, kaz or other outdoor antenna. Tunable medium wave loop antenna by gary ryan vk2zkt being a keen am broadcast band listener the opportunity to purchase a loop antenna for am reception cannot be overlooked. Using tuned passive loop antennas ive heard it said that successful medium wave dxing is 50% antenna and 50% receiver. Shortwave antenna plans and links category is a curation of 54 web resources on, long loopstick antenna, rhombic antenna for shortwave radio broadcasting, echelonlog beverages. Try untwisting the two ends of your coil and connecting the antenna to each end in turn. Kiwa loop antenna, kiwa poster loop, kiwa pocket loop antenna.
Yduns medium wave info news, reports, and loggings from the long and medium wave bands. Part of this band is the medium wave mw am broadcast band. The antenna is designed for a userprovided thin wire loop. The hula loop medium wave dx antenna ddeessiignnedd bbyy sseeaann ggiillbbeerrtt, gg44uuccjj the concept of the hula loop came after many years of building medium wave loops of varying size, shape and performance. Antenna radiation angle as the radio wave is launched from our antenna, it has a particular launch angle.
A beverage antenna is probably one of the simplest and cheapest antennas one can build but it does have onedraw back in that you need a lot of space or a very long thin garden. Mhz for vertical polarization and antennas over the ground itur p. For daytime signal maps, radio data mw generates a real pattern plot based on transmitter power, antenna array efficiency and directivity, ground conductivity and ground dielectric constant of the path to the receiver. Browse through any dxpedition report to see what is heard using beverage antennas and a good location of course. Medium wave am broadcast band resonant loop antenna. Pdf design of a ferrite rod antenna for harvesting. The sloping vee is a medium to longrange sky wave antenna that. Medium wave antennas 10 kw 300 kw mw folded unipole antennas these antennas have been developed in order to cover mobile systems needs as well as the emergency service of temporary mw am broadcasting. This book is about common medium wave and high frequency short wave antennas, but the theory presented here relates to antennas of any frequency.
Broadband receiving antenna matching mark connelly, wa1ion 15 july, 2003 this article addresses the subject of obtaining the best signal transfer from an antenna to the typical 50ohm receiver input over a wide frequency range, with emphasis on medium wave. The concept of the hula loop came after many years of building medium wave loops of varying size, shape and performance. The projects include all together now a new nightly programme hosted live by alex lester on the medium wave network, hjb greatest hits radio, and produced by want some media. The more rigid self supporting version better suits. Sloper or slant antennas require only one elevated support 25 feet or higher while dipoles require two elevated supports. Carrier and noise measurements in the medium wave band. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. This is the simplest form of omnidirectional antenna. Medium frequency amplifier circuits compared mark connelly, wa1ion 12 aug 2003 lownoise rf amplifiers are often needed in receiving applications when using antennas substantially smaller than what is considered efficient for a specified frequency range. Increased conductivity of water paths over the great lakes are also accounted for.
They can also be used as stationary antennas for services in the mw broadcasting range. This white paper describes the basic functionality of antennas. Clerks in radio stores told me that this book was outselling other titles 2. Usually these loops are constructed on a square wooden frame, with wire being wrapped around the periphery. Receiving only antennas category is a curation of 84 web resources on, the w2pm mini diamond receiving flag, the challenge. Includes a power adapter connected to screw terminal inputs. Us medium wave pattern references amateur radio station.
Antenna radiation angle as the radio wave is launched from our antenna, it has a particular launch angle radiation angle, respective to the horizon. Calculation of radio electrical coverage in medium. The authors present an optimised design for such an antenna for harvesting energy from medium wave broadcast transmissions. Device engineers working on eversmaller integrated circuits and at ever higher frequencies must take into account wave propagation effects at the chip and circuitboard levels. Some antennas have more than one radia tion lobe in fact, most do, and each lobe has a different intensity and radiation angle. Radio data mw generates a real pattern plot based on transmitter power, antenna array efficiency and directivity, ground.
A portable long wave loop antenna 127 khz to 452 khz by. Medium frequency amplifier circuits compared mark connelly. Williams in antenna theory and design, published by sir isaac pitrnan and sons ltd. Medium wave circle an introduction to long distance. That assumption proved to be correct as i have received letters from a wide variety of people. Medium frequency mf is the itu designation for radio frequencies rf in the range of 300 kilohertz khz to 3 megahertz mhz. The spectrum provides about 120 channels with limited sound quality. Review and analysis of medium wave directional antenna. Its routinely run about six feet off the ground and may or may not be terminated at the far end with a resistor directly to ground. Medium wave operates within the frequency range of 515 khz to 1629 khz which is part of the medium frequency radio band. If youve never tried listening to anything other than your local radio station on medium wave then these pages are intended to give you an insight into the stations you could hear, and how to identify them.
Pdf design of a ferrite rod antenna for harvesting energy. Medium wave am broadcast band resonant loop antenna medium wave mw am broadcast band loop antenna. Receiving antennas, triband receiving loop for 1608040m. One of my limitations was the size of my yard, so i developed an interest in tuned loop antennas to compensate, because setting up a beverage antenna was out of the question.
External noise measurements in the medium wave band ehu. The paper describes the reasoning behind a very small but efficient antenna now being used in several daily services for am broadcasting on. The kaz directional mw antenna i have always had a soft spot for medium wave and a couple of years ago i decided to take mw dxing a little more seriously. It is in a condensed form and the antenna theory is explained so most hams can understand it. Index termsindoor, medium wave, digital radio mondiale. I recently purchased this antenna from sydney based avcomm pty ltd. Mp3 audio files of reception after the comparison charts you will.
Specifically targeting older listeners, the 2hour show will aim to create a sense of oldfashioned community spirit, featuring feelgood stories, life hacks, and. Hertzian dipole, standing wave antennas, half wave dipole, monopole antennas, traveling wave antennas, vee and rhombic antennas, loop antennas, circular. Extremely small high power mw broadcasting antennas ieee xplore. Hz is the abbreviated form of hertz in hz is the abbreviated form of hertz in cycles per second, khz is for kilohertz or 1,000 hz, and mhz is megahertz or 1,000,000 hz. Loop antennas how does a loop antenna work, pdf file.
Being a passive antenna, it does not require connection with any receiver or transmitter but can have a great effect in the directivity of an antenna system. The mf band is also known as the hectometer band as the wavelengths range from ten to one hectometer to 100 m. Includes a power adapter connected to screw terminal inputs on the back of the control box. Pdf short medium frequency am antennas researchgate. Lf and medium wave mw reception with remotecontrolled tuning. Compact medium wave transmitting antennas request pdf. A medium wave commercial station called love sport radio on 558 mw recently began broadcasting from london, and will later be available via digital as well. Several years ago, i became interested in medium wave dxing. The dxswl sloper offers coverage of the 90 and 120 meter bands, bands often forgotten by other antennas. The e ective area of an antenna depends on the size and shape of the antenna.
Broadband receiving antenna matching mark connelly. Dear friends, i lived in indonesia,ive made small medium radio which were used as gospel radio,ive help building many mw radio station in remote area like wamena,jayapura,nabire all in papuairian jaya,also in sulawesi,halmahera. Electromagnetic radiation includes radio waves, microwaves, infra. An active loop antenna is a good choice for medium wave and shortwave dxing if your space for antennas is very limited. Realizing many hams are mathematically challenged, only simple mathematics procedures are used. One of my limitations was the size of my yard, so i developed an interest in tuned loop antennas to compensate, because setting up a beverage antenna. Vertical antennas with height lower than one eight wave. Usually these loops are constructed on a square wooden frame, with wire being wrapped around the.
Neither radio netherlands or the medium wave circle has any financial connection with any of the manufacturers listed. For broadcasting, mast radiators are the most common type of antenna used, consisting of a steel lattice guyed mast in which the mast structure itself is used. Traveling wave antennas are nonresonant types, the current and voltage waves travel in. Your tuning coil will no longer act as a directional antenna for medium wave.
Marks radio, electronics, music, and other web links mark connelly wa1ion, is the designer of many of the antenna phasing units used by mw dxers. A portable long wave loop antenna 127 khz to 452 khz by on4ei 0 design 1 take a 64 conductor ribbon cable 2 meters long 2 strip 128 wires. I tested the w6lvp amplified loop antenna on two medium wave radio signals on 590 khz one from cuba radio nacional musicaland one from central florida wafc clewiston. Property availability for siting of antennas at medium wave frequencies often results in truncation or other restrictions on radial length. Ground wave propagation follows the contour of the earth, while sky wave propagation. If one assumes that the conductivity of the medium in which a wave propagates is very. Revisiting mediumwave groundsystem requirements hatfield. Medium wave mw is the part of the medium frequency mf radio band used mainly for am radio broadcasting. The goal was to hear some north american stations it couldnt be that hard could it. Does medium wave still have a place in the radio landscape. The antenna covers the frequency of the longwave and medium wave broadcasting band.
Medium wave mw is the part of the medium frequency mf radio band used mainly for am. Calculation of radio electrical coverage in mediumwave frequencies. The dipole, monopole, array and large loop antenna types below typically function as resonant antennas. Well, may be not so much of the little, but a peach definitely. Although designs exist for the upper end of the high frequency shortwave band and some for vhf bands, the principal uses are in the vlf through midhf spectrum roughly 10 khz to 8,000 khz. A full wave loop antenna a 160 meter band horizontal full wave loop antenna. Orfanidis ece department rutgers university 94 brett road. During daytime, only local stations can be received.
Hf antennas for small gardens generally also need to be unobtrusive but not necessarily stealth most good solutions are wire types most good solutions involve some compromise beams dont usually feature. Sample loops on the antenna structures and toroidal current transformers in the eed systems have long been used tof monitor directional medium wave antenna systems. The antenna instantly and dramatically boosts the am reception of any portable radio, home stereo receiver or table top radio, by simply placing the antenna near your radio and tuning it, or, with this. May 16, 2000 depending on how many turns you made, your tuning range will vary, but i estimate that it covers from about 5 mhz to 15 mhz, more than enough for decent listening. The success of the three previous editions of practical antenna handbook has been most gratifying. It performs well to improve signal reception in places where em1 noise or strong shielding conditions exist. A beam type of antenna at a height of 70 feet or more will provide greatly superior performance over the same antenna at 35 feet, all other factors being equal. The beverage antenna or wave antenna is a very long wire receiving antenna mainly used in the low frequency and medium frequency radio bands, invented by harold h. The ala100ln has similar interference reduction properties as the ala1530ln. This is a guide to long distance listening dxing on the medium wave mw band. Radio hams are only dimmly aware of this remarkable antenna for working 80 and 160meter bands. The antenna is extremely sensitive and can be built mostly from parts from old radios and tape recorders. There are many more articles like this one on the medium wave circle reprint cd, which is available from the medium wave store. Isotropic antenna idealized oradiates power equally in all directions dipole antennas ohalf wave dipole antenna or hertz antenna oquarter wave vertical antenna or marconi antenna parabolic reflective antenna oused for terrestrial microwave and satellite applications olarger the diameter, the more tightly directional is the beam.
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