In another test, i will report on my experience with the 80m version of the eh antenna. Easy, quick, and simple installation tunes and performs without radials or antenna tuners handles up to watts pep depending on mode and version. Steve ford, wb8imy, managing editor one of the great things about vhf and uhf is that an ht and its built in antenna will fit in your pocket, because these bands require hardly any antenna at all. The vb800 being placed on a pylon with 10m of the ground and the isotron, inside, 5m below the base of the vertical, under the roof of the terrace. Home of the am pressexchange, the am forum the largest bbs of its kind,and the am classifieds, photos, audio, and technical information. Manuals antennas parts mounting accessories amatuer ham radio antennas contact isotron antennas isotron, small antenna, lowprofile. About isotron antennas the resource is currently listed in in 3 categories. I have build it by following the instructions on the homepage of f5swn, but for 80m band and with copper plates. Listed under the antennas stealth category that is about hidden and stealth antennas.
For stealth applications suggest 18ga black wire from frys single band antenna when fed by coax works good for multibands when fed by open wire line and using a tuner. Link to isotron antenna manulas has been recently reported as not working and has been temporarily delisted from our categories check related resources in radio equipmentradio manuals from this page you can download the following manuals, in adobe acrobat format. Isotron is the trade name for a shortwave antenna marketed by bilal co. Internet turned up the isotron antenna and several industrial and medical devices.
The antenna was definitely not an asskicker antenna, but it definitely did enable me to work the world on 80m with an antenna with a. The main category is manuals of amateur radio transceivers and equipment that is about ham radio manuals for amateur radio. I got around to testing it and found that, mounted on a 20 ft mast in the back yard, it received signals about 2 s units lower than a halfwave dipole mounted about 10 ft higher. We had 2 of this item in stock at the time of the last update. The tools and techniques to make radio magic are everywhere. The feedpoint is what determines how the antenna will match the transmitter and measurements taken at the connector of the antenna. Filled with practical advice, this book guides you to finding the right antenna design to fit whatever space you have available. Isotron am broadcast antennas am antennas radio station. Has anyone on the group used one, and what are their opinions of isotron limited space antennas radiobanter. It is physically short as compared to a dipole antenna for a given frequency. Hf antennas especially stealth models for those in an hoa by dave land kd5fx. Packtennas are light weight, compact, portable hf antenna systems ideal for operating on the trail, at the campsite, on field day, sota activation, air. Then, to my surprise, the isotron exceeded the performance of the g5rv in both noise level and audio quality.
Just a handful of parts auto parts, in the early years could get an operator on the air. Same results reported from stations i contacted when switching between antennas the antenna is not hard to tune. I have been contemplating setting up an isotron 160 meter limited space antenna. Since the beginning, isotron has displayed a strong international focus. Antenna should be mounted on a metal mast with a maximum size of 1. The mast can be groundmounted with guy wires, mounted to a wooden pole, or attached to a tower leg. Isotron, microvert, ehantenna crossfield antenna cfa and similars. At the feedpoint the dipole or isotron am antenna will resonate. Low mounted terminated folded dipole barely visible over 6 foot fenceis very disappointing. If your wallet is a bit thin, its time to indulge your creativity.
Arrl s small antennas for small spaces is a valuable resource for amateurs who live in apartments, condominiums, or houses on small lots. The main category is hf antenna manufacturers that is about manufacturers of amateur radio hf antenna this link is listed in our web site directory since friday dec 15 2000, and till today isotron antennas has been followed for a total of 5468 times. A two band isotron antenna would fit within the association rules. Therefore whether the circuit is on your radio board or hanging as an antenna, all formulas and theories apply.
Actual shipping cost will be determined at the time of the order. It consists of an inductor wound for 20 m and a capacitor which consists of a top fixed metal plate and a movable lower plate which allows you to tune the antenna. Oct 11, 2012 ada dirgram atau sukatan untuk antenna isotron ni. Manual 40 antennas parts mounting accessories amatuer ham radio antennas contact isotron antennas isotron, small antenna, lowprofile antenna. Not so if you favor hf operating and still want performance. The bandwidth of the isotron is quite narrow as compared with a dipole antenna.
A stealth antenna is one which is designed to go unnoticed. The results were simular to my test of the 40m antenna. Former arrl technical editor w1zr, in his columns getting to know your radio receiver gain control june 2006, p. Antenna should be mounted as high as possible for best performance. F6bqu luc pistorius andatelo a vedere, e interessante. Solve virtually any restricted space problem 40 meter isotron only 22 inches x 16 inches x 15 inches. Low power, crummy antenna american radio relay league. After studying the manual carefully, i decided to drive a 4 foot ground rod into the. I saw that you recommended the isotron antenna for this transmitter. Former arrl technical editor w1zr, in his columns getting to know your radio. Antennas parts mounting accessories amatuer ham radio antennas contact isotron antennas isotron, small antenna, lowprofile antenna. Pcselectronics view topic isotron am broadcast antenna. Antennatoground capacitance affects resonant frequency and feedpoint impedance of your antenna. A site dedicated for the am radio amateur and vintage radio.
Does this antenna require any tuning or is it just connect and forget. The isotrons are electrically resonant by using only two components the large coil in series with the capacitive plates of the antennas. The selected antenna row will be highlighted, and the azimuth andor elevation pattern for the antenna will be shown in the listing and the thumbnail antenna plot on the form. Andando a vedere il sito internet segnalatomi dal giorgio venivo a conoscenza di questantenna, cosi chiamata dallautore del sito stesso. For an antenna to work, it should be electrically resonant. Isotron than on my dipole, i still cant believe how good that birdfeeder works. Antenna theory isotropic radiation in the previous chapter, we have gone through the radiation pattern. The 40 meter isotron instruction manual is a small, 18 page manual put together in pamphlet. On 40 and 80m band, it is made of two plates into v whose angles are connected by a coil. The g5rv and isotron surpassed the vertical in signal capture.
In fact, i believe the isotrons work just about as well as my home antenna. In switching from that ant to my isotron i got at the most a 1 to 1. In classical theory, an antenna is treated as a device, where an oscillating current flowing in. Oct 01, 20 ive been hearing a few nightly dx stations, on the lower end of the general class portion of the 40 meter band, but never thought i could work one. Hi will, i used an isotron 40 from my firstfloor apartment back in 198081, and i was surprised at how well it worked. Am antennas are brought to you by progressive concepts, your source for radio station equipment.
As you can see i am one of the first proud owner of the am max ii. Hi mandy, the isotron antenna is a tradename used by bilal co. Here are the instructions how to enable javascript in your web browser. Easy, quick, and simple installation tunes and performs without radials or see more. Low power, crummy antenna ingenuity compensated for a limited budget in the golden age of radio and itll do the same today. Used excel isotron 220 muscle stimulator for sale dotmed.
Author qualifications the brag tape hewlettpackard tech writer 21 years, dxer 24 years. The isotron is 6 to 10db the higher than the vb800 at european distances. If you dont have room for a fullsized antennaor are otherwise restricted in. As far as i know, they havent published any gain figures. Mar 24, 2008 a friend gave me an isotron for 40m, several years ago. There is more that is necessary for an efficient antenna. Here the description of a home made realization for the 40m band. Hf antennas especially stealth models for those in an hoa. Easy, quick, and simple installation tunes and performs without radials or antenna tuners handles up. In the beginning, virtually all hams operated lpca.
Progress in design of extremely short antennas dc4fs yumpu. Antennas are structures, which convert electrical oscillations of a line into radio waves in space, and. Actual shipping cost will be determined at the time of the. Lpca low power, crummy antenna, not logperiodic cubical array or anything that exotic is merely a new name for an idea as old as radio itself. Antenna theory radiation pattern radiation is the term used to represent the emission or reception of wave front at the antenna, specifying its strength. I was very surprised when i called dj6zm on 7026 mhz with 5 watts from my indoor mounted isotron antenna and he answered with a question mark.
The isotrons were hooked in parallel and mounted on a pair of stacking. Bilal isotron iso80 stealth 80 meter amateur radio antenna. On 30m or 20m this combination of height and somewhat lower loss clearly favors the isotron as it would any reasonably efficient small antenna. It consists of a coil placed between two angled sheet metal plates. Contact us today to learn more about the products we carry. Solves virtually any restricted space problem for example, a 40 meter isotron measures only 22 inches x 16 inches x 15 inches easy, quick, and simple installation tunes and performs without radials or antenna tuners handles up. This is most pronounced on the lower frequency bands. The antennatoground capacitance of your isotron antenna depends on its location with respect to other objects and to the ground itself, and how and where it is mounted. However, unless you have a very high tree and cant hang a 40m or 80m dipole.
An isotron antenna solves virtually any restricted space problem for example, a 40 meter isotron measures only 22 inches x 16 inches x 15 inches. Suggested by pink floyd nick masons saucerful of secrets live at the roundhouse 30 second trailer song shine on you crazy diamond parts 1 5 2011. Already during the 1980s ralf bilal 3 came out with his isotron antenna. Imo, almost anything short of a dummy load would be more efficient and it is not worth the money. Amateur radio antenna projects pole shift survival information. Stealth antennas the columbia amateur radio club presents. A friend gave me an isotron for 40m, several years ago. Antenna should be mounted as high as possible for best performance antennas are ups shippable. Ks 981 multifunction unit all automation functions in a single unit controlling, computing, sequencing, programmer visualization, operation, alarm processing comprehensive function library redgreen lcd matrix display selectable io expansion via module c or canopen bus graphical engineering tool and simulation front and rear interface ports. Manual 80 antennas parts mounting accessories amatuer ham radio antennas contact isotron antennas isotron, small antenna, lowprofile antenna.
Solve virtually any restricted space problem 40 meter isotron only 22 inches x 16 inches x 15 inches easy, quick, and simple installation. You can select an antenna from the antennas in the library by clicking the selection button to the left of the row. That was the one that was a tapering aluminum tube about 18 feet tall i guess that was the 18 in the model number with an airdux coil at the base and a manual tap. When an isotron antenna was lab tested at 400w, it reportedly smoked and caught on fire. About isotron antenna manulas the resource is currently listed in in a single category. We carry am antennas and other broadcasting equipment as an expert radio broadcasting equipment company. Well im putting the 101520 combo version together and its been more of a problem. Since isotron antenna advertising in other magazines showed a picture of a baby standing next to an isotron antenna, qst staffers nicknamed the product the isotron.
Als behelfsoder notantenne fur antennengeschadigte cb funker. To have a better analysis regarding the radiation of an antenna, a referential point is nec. Each antenna has an so259 connector and each antenna is connected in parallel via short piece of. Mar 17, 2017 confirm the isotron radiating feedline theory by placing a snapon ferrite choke at various places along feedline and checking the swr. Jetstream jtps32mab 30 amp 12 volt power supply w power pole and binding posts.
Xe1xnp 80 meter qso datrontransworld tw100f flyaway suitcase hf radio and isotron antenna. The uk leading supplier and distributor of communications equipment. Packtenna makes ultralight, portable hf amateur radio antenna systems and accessories. Match comes automatically with the right combination of the two components at resonance. I never had a gotham but i had something kind of like one, the hygain 18avt vertical. Diameter coil, saiz hat capacitor plate dan panjang aluminium rod counterpoise.
421 1217 652 1495 356 921 1429 571 837 1009 1426 1107 413 759 563 1181 859 1184 116 1258 1139 1443 398 1289 703 463 117 1305 1458 1277 551