One well known example is the bilal isotron antenna. Kraus this text is for the course on antennas offered to the seniorgraduate level by most electrical engineering departments. My plan is to backengineer homebrew versions from this one you could check the antennex homepage at. Explain resonant and nonresonant modes of long wire antenna. A good antenna does not have to be the best antenna in all cases. Solve virtually any restricted space problem 40 meter isotron only 22 inches x 16 inches x 15 inches easy, quick, and simple installation. 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. Xe1xnp 80 meter qso datrontransworld tw100f flyaway suitcase hf radio and isotron antenna. Design a rhombic antenna to operate at 20mhz when the angle of elevation angle 10o. Then, to my surprise, the isotron exceeded the performance of the g5rv in. You can enjoy the pleasures of amateur radio to a degree that you may not have. Manual 40 antennas parts mounting accessories amatuer ham radio antennas contact isotron antennas isotron, small antenna, lowprofile antenna.
My 40 meter antenna has often been called the bird house becauselets face it, ive seen bird houses about this size. When the isotron antenna appeared on the market, the manufacturer tried to advertise the isotron in qst. Durable construction, can be used in extreme weather conditions. The isotron 15 antenna is mounted indoors on pvc pipe. 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. It worked a treat with a very low swr across most of the band. Find excel isotron 220 low voltage muscle stimulator chiropractic physical therapy in dallas, texas, united states. Home of the am pressexchange, the am forum the largest bbs of its kind,and the am classifieds, photos, audio, and technical information. Packtenna makes ultralight, portable hf amateur radio antenna systems and accessories. A vertical metallic support through the antenna system has no influence to the feedpoint impedance and the resonant frequency.
Antenna should be mounted on a metal mast with a maximum size of 1. In simple terms, we designed the isotrons into a three dimensional package. Packtennas are light weight, compact, portable hf antenna systems ideal for operating on the trail, at the campsite, on field day, sota activation, air travel, or hoa restricted locations. 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. A kind of shortwave antenna consisting of a coil between two angled sheetmetal plates.
Here the description of a home made realization for the 40m band. When an isotron antenna was lab tested at 400w, it reportedly smoked and caught on fire. In the apartment i used secondhand, coaxfed 20 and 40meter bilal isotron antennas. Ingenuity compensated for a limited budget in the golden age of radio and itll do. It only needs to be the best antenna one can deploy. A friend gave me an isotron for 40m, several years ago.
The g5rv and isotron surpassed the vertical in signal capture. View and download sirio antenne sd 27 dipole installation manual online. I am going to buy either an 80 or 40 isotron from bilal. I used secondhand, coaxfed 20 and 40meter bilal isotron antennas. From loops to dipoles, there is an indoor antenna thats guaranteed to work for you. It is physically short as compared to a dipole antenna for a given frequency. At the feedpoint the dipole or isotron am antenna will resonate. The text explains both the basic theory of antennas and its application to practical designs. My 40 meter isotron antenna is the one with the small coil on the left side of the painters pole. Well, ill get the unit hoisted up when the weather clears. 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. Future sex was a 1990s magazine based in san francisco and published by kundalini publishing.
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. In fact, im wondering about the other bands160, 40, 20, 17, 15, and 10. Isotron is the trade name for a shortwave antenna marketed by bilal co. Used excel isotron 220 muscle stimulator for sale dotmed. Sirio antenne sd 27 dipole installation manual pdf. Our report from him was the same, regardless of antenna. 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 hf antenna is a bugcatcher style vertical that has netted me cw and phone contacts worldwide using my icom ic706mkii. Diy tv antenna, antenna gain, ham radio antenna, wifi antenna, electronics projects, electrical projects, antenne. The feedpoint is what determines how the antenna will match the transmitter and measurements taken at the connector of the antenna.
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 to watts pep depending on mode and version. I can picture them all on one tower with no wires, control cables or antenna rotors. In those days, qst required manufacturers who wanted to advertise a product in qst to send a sample for evaluation in the arrl lab. Since the beginning, isotron has displayed a strong international focus. Easy, quick, and simple installation tunes and performs without radials or antenna tuners handles up to watts pep depending on mode and version. Low power, crummy antenna american radio relay league. In attic, spirals, wire loops, magnetic loop antennas. On the hf bands, a bumpermounted homebrew antennathat costs about the same as the vhf antennaadded the bonus of a fun day at the workbench. Isotron antennas 80 meter isotron antenna iso80 size h x w x d 32 x 16 x 15 bandwidth 110 khz. Nbc specs pdf document from 1986 on video and audio levels for the network.
Documents, articles, schematics, and manuals hfantenna. It will also appeal to practicing engineers working on antenna development. 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. It consists of a coil placed between two angled sheet metal plates. Simple gain antenna for the beginner 778,544 bytes, pdf file qst august.
We worked ja1nut on 20 meter cw, and shin was patient enough to endure considerable antenna switching during our qso. Diameter coil, saiz hat capacitor plate dan panjang aluminium rod counterpoise. On 40 and 80m band, it is made of two plates into v whose angles are connected by a coil. 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 5479 times. I mounted them on the balcony before operating and took them down when i was done. 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. If we assume othe average beamwidth of rhombic antenna as 10, then design an antenna system such that it will radiate maximum power over the. A site dedicated for the am radio amateur and vintage radio.
Same results reported from stations i contacted when switching between antennas the antenna is not hard to tune. In the case of the ehantenna, i see its strength in the low bands 1608040m. On 20 meters, the zr3 had the receiving edge, but on transmit, both antennas performed about the same, judging from reports. Therefore whether the circuit is on your radio board or hanging as an antenna, all formulas and theories apply. Sgc smartuners for stealth antennas free click on download your copy.