A site dedicated for the am radio amateur and vintage radio. Isotron is the trade name for a shortwave antenna marketed by bilal co. The company has been involved in large scale radionuclide decontamination as well as chemical and biological agent decontamination and protective equipment since its inception in 1986. Basic antenna theory and application a major qualifying project report. We worked ja1nut on 20 meter cw, and shin was patient enough to endure considerable antenna switching during our qso. A vertical metallic support through the antenna system has no influence to the feedpoint impedance and the resonant frequency. A friend gave me an isotron for 40m, several years ago. In switching from that ant to my isotron i got at the most a 1 to 1. You will need an open area large enough for the entire run of the wire. 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.
The opinions expressed in this book are those of the author and not. Similarly, the highly directional antennas can be used provide rural areas, which. From loops to dipoles, there is an indoor antenna thats guaranteed to work for you. The g5rv and isotron surpassed the vertical in signal capture. Here the description of a home made realization for the 40m band. In theory, the drivers should then automatically route the audio signals to the software. Home of the am pressexchange, the am forum the largest bbs of its kind,and the am classifieds, photos, audio, and technical information. Save products on your wishlist to buy them later or share with your friends. Bilal isotron iso80 stealth 80 meter amateur radio antenna. One of the hams in our local club often brings them out for field day and usually does well. Used excel isotron 220 muscle stimulator for sale dotmed. 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. There are ten models available to cover the entire am broadcast band.
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. They worked great and, although the mast was six feet from my tv, i could tune a clean signal at 100 w output. Somewhere on the isotron website, i believe they make the claim that it is a very quiet receive antenna that can be rotated to null out local noise. A kind of shortwave antenna consisting of a coil between two angled sheetmetal plates. We can produce such a dipole by considering two opposite. Since the beginning, isotron has displayed a strong international focus. The isotron 160c will be assembled on the mast from the top down. After studying the manual carefully, i decided to drive a 4 foot ground rod into the. Find excel isotron 220 low voltage muscle stimulator chiropractic physical therapy in dallas, texas, united states. Jun 4, 2017 an isotron antenna solves virtually any restricted space problem for example, a 40 meter isotron measures only 22 inches x 16 inches x 15.
Well, ill get the unit hoisted up when the weather clears. One well known example is the bilal isotron antenna. In those days, qst required manufacturers who wanted to advertise a product in qst to send a sample for evaluation in the arrl lab. At the time of this writing, i have been licensed for 45 years and i. It is essentially a vertical dipole, in which one side of the dipole is the rf image of the antenna in the ground. The antenna can also be suspended by running a thin rope through the antenna pipe, and then anchoring the ends of the rope between two tress like a dipole. I have build it by following the instructions on the homepage of f5swn, but for 80m band and with copper plates. When the isotron antenna appeared on the market, the manufacturer tried to advertise the isotron in qst. 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. Easy, quick, and simple installation tunes and performs without radials or antenna tuners handles up to watts pep depending on mode and version. Order the model that covers the frequency you will be using.
Now that i have enough gnuradio tools to measure reflection coeffecients, sweeping across a range of frequencies collecting magnitue and phase data it should be possible to put them to use for something practical like tuning an antenna. Same results reported from stations i contacted when switching between antennas the antenna is not hard to tune. Other antenna types isotron isotron antennas are a group of rather strange looking antennas, some of which can be combined on a single mount for multiband capability. In exchange for simplicity and low cost you give up operational space, meaning, the antenna is small and lightweight for storage but when deployed it will take up a lot of linear feet. Here are the instructions how to enable javascript in your web browser.
My 40 meter isotron antenna is the one with the small coil on the left side of the painters pole. On 40 and 80m band, it is made of two plates into v whose angles are connected by a coil. The isotrons were hooked in parallel and mounted on a pair of stacking. It is a vertical conductor 4 high, fed at the end near ground. Right now, im getting out about 2 miles with in the tune up position and im sure it will vastly improve once im fully operational. Manual 80 antennas parts mounting accessories amatuer ham radio antennas contact isotron antennas isotron, small antenna, lowprofile antenna. I mounted them on the balcony before operating and took them down when i was done. On 20 meters, the zr3 had the receiving edge, but on transmit, both antennas performed about the same, judging from reports. In fact, i believe the isotrons work just about as well as my home antenna. Submitted to the faculty of the worcester polytechnic institute. The isotron antenna represents an interesting antenna design and build techniques for an compact transmitting and receiving antenna to be used in small spaces and locations where there are. Then, to my surprise, the isotron exceeded the performance of the g5rv in.
You will need a metal mast to support the antenna during assembly. Our report from him was the same, regardless of antenna. If your isotron hits the state eoc from the roof of that building, your shortened, twotoniceloadingcapable antenna will do a better job. It is physically short as compared to a dipole antenna for a given frequency.
It may behave similar to a receive loop, with nulls broadside to the faces of the loop. About isotron antennas the resource is currently listed in in 3 categories. The isotron 15 antenna is mounted indoors on pvc pipe. I have no personal experience with them but reports are fairly good. Diy tv antenna, antenna gain, ham radio antenna, wifi antenna, electronics projects, electrical projects, antenne. Easy, quick, and simple installation tunes and performs without radials or antenna tuners. Isotron antenne 80m band antenna isotron for restricted spaces. 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 5480 times. The isotron am antennas are the perfect am broadcast antenna for all broadcast band am transmitters from 300 to watts. In the apartment i used secondhand, coaxfed 20 and 40meter bilal isotron antennas. The poynting vector antenna has been one of those novel designs on the fringes for a while now, it has been variously described as the supert, or the flute. It consists of a coil placed between two angled sheet metal plates. Isotron corporation is a small business specializing in materials research for environmental remediation and protection. This may sound strange, but remember that ground reflects rf as a mirror reflects light.
Manual 201110 modified antennas parts mounting accessories. Groundplanes can cause trouble even with the best cb setup, if your groundplane isnt very good then your antenna will not perform as well as it should. My 40 meter antenna has often been called the bird house becauselets face it, ive seen bird houses about this size. Low power, crummy antenna american radio relay league.