Mfj Antenna Loop

Sharing is caring! 8 thoughts on "Measuring Quarter Wave Coax Stubs using MFJ Analyzer" Alex. If you use the line specified, my length should be close enough to work, if you cut the antenna length properly. Multiband operation is achieved by use of 300 ohm balanced line fed to an antenna tuner. Magnetic loop receive antennas are a great weapon in the fight against natural and man-made noise. In The Loop! - Repairing a MFJ-1788 Over the last few years I've seen various musings about magnetic loop antennas and their supposed efficiency and performance. mfj mfj-1886x loop antenna, 0. The W5JGV Loop Antenna. The diameter is 1 meter instead of the 90cm MFJ offers. Simplified Operating Instructions and Explanations. MFJ from Starkville (MS), USA is dealer and manufacturer of a very wide range of antennas and accessories for amateur radio. Even at 530 kHz, it provided threshold daytime audibility of Turks & Caicos on 530 kHz from Harwich: that's just about as good as the loop. The antenna: There are two Loop antennas that MFJ makes and if I was to make the choice again I would had gone with the MFJ 1786 as it covers 10m to 30m. Making the loop as large as you can without surpassing the 1/10th wavelength limit, will produce the largest signal. 5 kW tuner easily handled the job quite fast on all bands 80-10 meters. The method used to obtain this new design was strictly through experimentation. Short Beverage or EWE 40-80 Meters: 1. Found some tech notes about loop antennas at MFJ. It can be used to. Describe your experience with the MFJ-1788 Super Hi-Q Loop and tell us why you give it the rating you did (required). Modifica Antenna Loop MFJ-1788X 15 Luglio 2016 IZ0HCC, Fabrizio Modifiche Analizzando il sistema di fissaggio dell’antenna loop mfj-1788x ho notato una criticità che non permette la sicurezza necessaria alle antenne om. 10-30 MHz Hi-Q Deluxe Loop Antenna $411. Once I tracked down all of the noisy wall warts in the house 😉 I am fortunate to have a RF noise quiet location, however there are always times when I miss the ability I have on the higher HF bands to moderate interfering signals with a Yagi. The MFJ-1886 Receive Loop gives you tremendous power to copy weak stations through impossibly strong levels of QRN or QRM. It can be used both indoors and out. 0711776-2 Cessna 182t Stiffener Rh Antenna For Sale. Add (PUB) MFJ-1796: MFJ 1796 Vertical Antenna. This antenna works, unlike some that ship from the factory. 5 kW tuner easily handled the job quite fast on all bands 80-10 meters. Figure 1: MFJ-926B and MFJ-4117 Installation Block Diagram Note: To use the Random WIRE binding post, make sure to remove the antenna, if any, from the ANTENNA connector. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. Jun 2, 2017 - MFJ-1786 Loop Antenna - My Stealth Antenna Installations I used / am using this MFJ-1786 antenna at various QTHs from a mountain top overlooking the Great Smoky Mountains National Park, to our beachfront condo 100 yards from the Gulf of Mexico to our current home in Potomac, Maryland 15 miles from the White House and …. These antennas have length nearly equal to the intended wavelength. Mechanically, the MFJ loop tuners are all very similar. This means the tuner should be at that recommended height, since it is connected to the bottom (ends) of the loop, whatever the loop antenna configuration. Part # MFJ-1886TR Manufacturer MFJ UPC Availability This product requires special order. Take any other information with a grain of salt. Large loop antennas are also called as resonant antennas. The SLR-40 is a 40-Meter direct-conversion receiver with balanced antenna inputs, and was specifically designed for use with a shielded loop antenna. Given sizes of components and all, it is rated to handle no more than 25 watts. I have been looking at these for years, and have always been fascinated by mag loops. For the last five or so years, I have been using a rather different magnetic loop antenna. You are free to build these projects for non-profit home or club purposes only and at your own risk and without any guarantee!. If antenna impedances cannot be measured, MFJ AdaptiveSearch T M searches only the relevant components that can match your antenna giving you ultra-fast tuning. Keep the coax from the MFJ to the clip leads as short as possible. Loop in horizontal position omni directional is, so you don't need a rotator. I can not see a lot of difference between them. EST (770) 614-7443 Phone (678) 731-7681 Fax E-Mail 312 Swanson Drive Suite B Lawrenceviile, GA 30043. Therefore, the positioning of the rear antenna connectors and the PVC top mount are identical on all models so the optional MFJ-58B Cross Antenna Kit (more discussion below) will fit all the different. MFJ HI Q LOOP Antenna | eBay. However, things have now changed. , February, 1973. Guess it is time to purchase phase inversion noise cancel device like the Timewave ANC-4 or MFJ equivalent. Used, mfj antenna tuner 948. Magnetic loop receive antennas are a great weapon in the fight against natural and man-made noise. Loop MFJ 1788x. I recently picked up a W6LVP Magnetic Loop a few weeks ago and put it up about 20 ft on a Channel Master rotator and use it as my receive antenna on my ham station while using a 132 ft Carolina Windom antenna for transmit. In the past wide band HF loop antennas have not been cheap, normally costing $300+ dollars from manufacturers like Wellbrook. Loop Antennas - North American versions especially for Canada and the U. While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. This is not strictly true - there is an intense electric field around the tuning capacitor part of the loop. We mostly have very low humidity and condensation is not usually an issue. MFJ-1786 MFJ Enterprises. I used an MFJ Cobweb antenna as the comparison antenna” MFJs tiny 36 inch diameter loop antenna lets you operate 15 through 40 Meters continuously — including the WARC bands! Ideal for limited space — apartments, small lots, motor homes, attics, or mobile homes. MFJ-974 (MFJ 974 MFJ974) technical specifications : MFJ-974 (MFJ 974 MFJ974) technical specifications The MFJ-974 is a fully balanced true balanced line antenna tuner. The Near Vertical Incident Skywave (NVIS) antenna is a half-wave dipole antenna mounted not over 1/8th wave above ground (at the highest operating frequency). The SLR-40 is a 40-Meter direct-conversion receiver with balanced antenna inputs, and was specifically designed for use with a shielded loop antenna. I have had a problem with getting 20m to tune. 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. 6pf, and around a 50% efficiency. Everything else is included. This item is brand new but no boxed as in the picture. The MFJ-9232 is probably the smallest loop tuner. See the tables and plot below. >Is the HF Loop antenna from MFJ - MFJ-1786 - a 'good' antenna? I am >considering a house in a restricted area, so a loop in the attic might >be an option. While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. The method used to obtain this new design was strictly through experimentation. The MFJ-1786 Magnetic Loop Antenna is a bit expensive (around $450), so you may want to "roll your own" following a design such as the "Alex Loop Walk Ham Antenna. Great deals on MFJ Radio Antenna Tuners. This means as long as the circumference of the loop is less than one wavelength of the frequency to be used, it will work. Shielded-Loop antennas have some nice properties that make them desirable as portable receiving antennas. I read today that a Magn. mfj delux noise canceling signal enhancer. The MFJ-1786 Magnetic Loop Antenna Well, I bit the bullet today and placed my order with MFJ for an MFJ-1786 magnetic loop antenna. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. 00: MFJ-936B 300W rated HF wire loop antenna $599. We mostly have very low humidity and condensation is not usually an issue. Available separately, the MFJ-57B or MFJ-58B PVC Cross Loop Antenna Kits can be used to make a compact self-contained antenna system requiring no ground, radials, or counterpoises. In either case, too much gain overloaded the 750. " My use of loop antennas has been on the larger size--my current HF antenna is an 80-meter delta loop fed with 450 ohm ladder line into a 4:1 balun and then into my Drake MN-4. HRO Discount Price: $269. More Info and Demo Photos. Click here for a loop antenna rotator control diagram. Loop antenna doesn't pick up man made noise, though less than a wire antenna. MFJ-1886 Receiving Loop Antenna. MFJ Super Hi-Q Loop Antenna CAUTION: Do Not Attempt Operation Of This Unit Before Reading All Instructions The MFJ "Super Hi-Q Loop" is the best performing and most convenient small space antenna available to amateurs today. Note the low angle of radiation. This is the MFJ 9020 QRP / CW rig. Amateur Satellite Contact with a HT and a Whip Antenna 2 weeks ago. Page 9 An operational height equal to 1/2 diameter of the loop antenna is recommended to prevent detuning and excess ground losses when using the MFJ-9232 Mini Loop Tuner loop antenna system. • POWER Button: Used to turn the power on and off. But to prove my findings I hook the 1/4 wave piece to a T connector with. All Antennas, Base, Military Aviation Commercial. The loop antenna is a Wellbrook ALA1530S+ is a 1 m diameter loop antenna. An Indoor Loop Antenna for 6m Colen Harlow, G8BTK. More Info and Demo Photos. 3 to 30 MHz with a full 150 Watts. Shielded-Loop antennas have some nice properties that make them desirable as portable receiving antennas. Note: The top of this page has links to various receiving antennas such as Beverage, "magnetic" loop, and vertical low-noise DX receiving antennas. create a very compact HF antenna. A magnetic loop antenna may be the answer and they are not as difficult to build as you might think. For this design, the used of resonant loop antenna is utilize where the length of the loop is approximately equal to the wavelength. It can be used to. Aug 11, 2014 - MFJ-1786 SUPER HI-Q LOOP, 36~ DIA, 10-30 MHz (531×799) like to have one to try out. I do have nor enough space for long wire antenna's. Due to the shipping complexity of this item an additional shipping charge will be added when shipped. Having owned the MFJ 269 for a number of years, I’m under No Illusion about the Mini 60. This configuration is best suited for working long haul DX. Recently Chinese manufacturers have begun producing a low cost wide band (100 kHz - 30 MHz) magnetic loop HF antenna known as the MLA-30. See how it works!. 5 MHz and Below. This article has described some modifications to the MFJ-932 QRP Loop Tuner that overcome some of the deficiencies associated with this compact loop antenna tuner,. Operating portable QRP can be even more of a challenge. The SLR-40 is a 40-Meter direct-conversion receiver with balanced antenna inputs, and was specifically designed for use with a shielded loop antenna. The MFJ-1782X Super Hi-Q Loop Antenna is exactly the same antenna as the MFJ-1786 but the control box does not have VSWR/Power metering or the auto band selected mode. The antenna may be a bit too long, but I’m certainly NOT going to change anything!. I watched some videos on, "YouTube" about them and also did some other research. I have attached all my detailed. This is not strictly true - there is an intense electric field around the tuning capacitor part of the loop. MFJ-1780 Box Fan Portable loop Antenna continuos coverage 14. PA3GZK use the transmitting antenna 4 meter away from the receiving antenna, which is still intact despite sometimes 1 KW transmitter power. I've been playing with the idea of building a 11/10 meter loop antenna for my 1st floor apt but I'm becoming quite discouraged. Be prepared and able to communicate in case of emergency with the largest selection at eBay. 30 amp heavy duty power supply. The MFJ-9232 Mini Loop Tuner TM is a small, versatile, high-efficiency device that turns any wire loop into a high-efficiency multi-band transmitting antenna system. The article MFJ-1786 loop antenna - measurements and NEC-4. 0 out of 5 stars 2 $299. In either case, too much gain overloaded the 750. For 40M this works out to be 1005/7. Is this because it is low (22-24 feet) off the ground? I could hang a longer dipole, but not higher. PK's Loop Antennas. I recently picked up a W6LVP Magnetic Loop a few weeks ago and put it up about 20 ft on a Channel Master rotator and use it as my receive antenna on my ham station while using a 132 ft Carolina Windom antenna for transmit. I have been looking at these for years, and have always been fascinated by mag loops. I read today that a Magn. MFJ also owns other well-known brands such as Ameritron, HyGain, Cushcraft, Mirage and Vectronics. 01-60 MHz: MFJ: MFJ-1020C Indoor Active Antenna 0. All you need is a 50-ohm feedline with PL-259 connectors to connect up the loop plus a short PL-259 jumper to connect your radio to the Bias-T. In The Loop! - Repairing a MFJ-1788 Over the last few years I've seen various musings about magnetic loop antennas and their supposed efficiency and performance. 5 inches in length not 45. Covering AM broadcast through 30 MHz and beyond, its superbly directive element and bullet-proof low-noise preamplifier dig out buried signals normally lost when using wire antennas. This item is brand new but no boxed as in the picture. Get both low angle radiation for excellent DX and high angel. There are 2 banks of switches: One to select the inductor (the tap for the coil), and one bank to select the capacitor, as seen in the schematic. 5 to 30 MHz with a full 150 Watts. W6CAW "Fixed" Mobile 160 Meter Whip. Our Price. " Glad to hear you are having a good time with. Outdoor Terminated Loop Antenna. It instantly turns into a small, high efficiency multi-band transmitting loop antenna! You can operate 3. The measurements below are for building a Double Bazooka Near Vertical Incident Skywave (NVIS) Antenna. This loop antenna needs to be run in the horizontal plane. Maybe proximity to ground, too. When the power is off, the tuner is placed in. These tuners are designed to be directly connected to the base of the actual antenna loop. The problem was to compare the performance of a Chameleon CHA F-Loop Antenna, a 0. Performance objective. However, there is a MFJ product - the MFJ 1786 10-30 Mhz Loop Antenna at $419. Don't try to raise it by trying to balance it vertically unless you have a second man to help position it on your mast. Area Riservata. Wellbrook Communications Loop Antennas made in Great Britain by Wellbrook Communications For outstanding directional radio reception of medium wave, long wave and short wave DX. ) The UHF Model is 11 inches in circumference. MFJ-935B Loop Tuner, 5. In article , Irv Finkleman wrote: A chum of mine has the subject antenna with a bad motor. It is installed on a short mast with a Channel Master 9521A rotator. 5 inches in length not 45. 10-80 Meter Alpha Loop, 100W 10-40M, 20W 40-80 magnetic. Sister Companies. •MFJ-926B. DJ0IP's "OPINIO N" ABOU T MF J MATCHBOXES MFJ is a major player in the antenna matchbox market. Found some tech notes about loop antennas at MFJ. Cut the loop to specified length, mounted it to the controller/tuner box. Given sizes of components and all, it is rated to handle no more than 25 watts. MFJ’S 1020C Active SWL indoor antenna covers. Loop Antenna Ideal for limited space -- apartments, flats, small lots, motor homes, attics, or mobile homes. New MLA-30 Active Loop Receiving Antenna 100KHz-30MHz for Medium Shortwave Radio. And the re-tuning isn't that big a deal. 5 TO 30 MHZ - Drop Ship. MFJ 1886x RX loop antenna ( x2 ) for ham radio reception Kirkcaldy, Fife Selling my TWO MFJ 1886x ( RX only ) antennas complete with the bias Tee units and power supplies. Specialists in broadband loop technology. Dig out previously unreadable signals and track down annoying sources of interference with the MFJ-1886 HF Receive Loop Antenna! MFJ-213. between the radio and antenna. Get both low angle radiation for excellent DX and high angle radiation for local, close-in contacts. In the past wide band HF loop antennas have not been cheap, normally costing $300+ dollars from manufacturers like Wellbrook. 3 becomes a very small. Chameleon Antenna-- An innovative antenna design for fixed / portable or mobile use, and covering 6-80 meter bands! VERY nicely made, too! Antenna Magic Page-- Ray Jurgens, KQ6RH. Unfollow mfj antenna tuner to stop getting updates on your eBay Feed. The Baby loop is produced by Ciro Mazzoni in Italy. If you live in the shadow of one or more powerful AM broadcast transmitters, contact me for information on a solution for you. All Antennas, Base, Military Aviation Commercial. 1786 Mfj Super Hi-q Loop (40% similar) Due to its small size 36 diameter this is a great antenna for condos or apartments. The Tecsun AN100 AM Loop Antenna will increase the audio quality and clarity when compared with the internal antenna. MFJ-974 (MFJ 974 MFJ974) technical specifications : MFJ-974 (MFJ 974 MFJ974) technical specifications The MFJ-974 is a fully balanced true balanced line antenna tuner. I recently picked up a W6LVP Magnetic Loop a few weeks ago and put it up about 20 ft on a Channel Master rotator and use it as my receive antenna on my ham station while using a 132 ft Carolina Windom antenna for transmit. Add to basket. The engineers at MFJ have given serious thought in the areas of antenna design that increase efficiency in an effort to overcome the shortcomings of this type of antenna, ff you are on a limited budget and/or must contend with restricted installation space, I strongly recommend the MFJ-1796. The MFJ-1786 Magnetic Loop Antenna Well, I bit the bullet today and placed my order with MFJ for an MFJ-1786 magnetic loop antenna. The tuning is fairly sharp, but is not a big deal for me as I operate mostly JT65 and JT9 these days and the sub-band for these modes is only about 4KHz. See how it works!. COPYRIGHT 2018 MFJ Enterprises Inc. The MFJ-1788 Super Hi-Q Loop Antenna is ideal for restricted space locations. There are even lighter and cheaper alternatives if you only need to receive. In addition to having a lower angle of radiation than the horizontally polarized loop, they also reduce the local QRM (stations within about 500 miles) by a couple of S-Units. Though not the best choice for matching to a balanced antenna system, it seems to do a good job for me and my applications. I have been looking at these for years, and have always been fascinated by mag loops. I read today that a Magn. 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. Covering AM broadcast through 30 MHz and beyond, its superbly directive element and bullet-proof low-noise preamplifier dig out buried signals normally lost when. 914m) DIA 10-30 MHz loop at 10. MFJ-1786 loop antenna - measurements and NEC-4. Click here for a loop antenna rotator control diagram. Heron N2APB & J. The MFJ is a sturdy piece, and its stuck being large. best offering to date. MFJ-1838 6,10,12,15,17,20,30,40 METER INSTRUCTION MANUAL COBWEB ANTENNA HD. Covering AM broadcast through 30 MHz and beyond, its superbly directive element and bullet-proof low-noise preamplifier dig out buried signals normally lost when using wire antennas. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. 5 MHz and Below. The 6m 20" high Loop. For some time now I have been trouble shooting my MFJ 1788 loop off and on. Here is a photo of W2BRI with his 12 foot square magnetic loop antenna. How Low-noise Receiving Antennas really work. Describe your experience with the MFJ-1788 Super Hi-Q Loop and tell us why you give it the rating you did (required). 5 to 30 MHz with a full 150 Watts. If the inductor circumference approaches ¼ of a wavelength or more then the antenna would. It can be used both indoors and out. Mechanically, the MFJ loop tuners are all very similar. There is a large impedance mismatch, and the antenna system gain in this scenario is entirely due to mismatch loss, Gain=-MismatchLoss. This is a great little adjunct to those who want to play with (er…I mean "study") loop antennas. When I wrote the article on the AES IsoLoop I didn't know that MFJ Enterprises has a wide selection of small transmitting loop antenna tuners. Is this because it is low (22-24 feet) off the ground? I could hang a longer dipole, but not higher. SMALL HF MAG-LOOP ANTENNA TUNER ( For 40m-17m Bands) Photographs of the small HF Loop Tuner and the two loops. Review of MFJ -9232 QRP Mini Loop Tuner (AD#90) How Many Batteries Could Power The World? (ft. This loop antenna needs to be run in the horizontal plane. This one has the optional CW keyer and audio. It is designed for portability, and can be assembled or disassembled in about a minute. In fact, MFJ is "THE" major player in the antenna matchbox market. A bigger loop would work better on 80. Sent the controller back, got refund and bought a large capacitor and a reduction gear with isolation mounts. MFJ 1786 Super Hi-Q Loop Antennas MFJ 1786 Super Hi-Q loop Antennas are 36 in. Introduction Of the many different antenna projects I have built for HF, the most interesting and rewarding project was the small transmitting loop. If you decide to feed your loop with coax, I'd suggest using RG-8X or RG-213 and a high power, high performance 1:1 or 4:1 Current-type balun. MFJ's tiny 36 inch diameter loop antenna lets you operate 10 through 30 MHz continuously -- including the WARC bands! Ideal for limited space -- apartments, small lots, motor homes, attics, or mobile homes. MFJ-259D MFJ259D Original MFJ Enterprises Antenna Analyzer, VHF/220 MHz (100-160 KHz, 280-520 KHz,. Then purchased a long 1 inch roll of copper tubing to make the loop. I purchased this and their 40 Meter version as they are shorter than the Hamstick and have a little less wind resistance. Specialists in broadband loop technology. I find when I point the loop to the offending noise source, the noise to signal ratio is much higher than that of my regular dipole antenna. Page 9 An operational height equal to 1/2 diameter of the loop antenna is recommended to prevent detuning and excess ground losses when using the MFJ-9232 Mini Loop Tuner loop antenna system. 0 is able to set the antenna to the best S. 3-30 MHz With Current Meter 5 out of 5 stars 3 product ratings 3 product ratings - MFJ-935B 150W Loop Antenna Tuner 5. RG-8 Length not critical. b) Magnetic Loop Antenna Experiments For several years now I have been experimenting with Magnetic Loop Antennas at this QTH. Get both low angle radiation for excellent DX and high angle radiation for local, close-in contacts. The Finest MFJ Operating Guides Available. Great deals on MFJ Radio Antenna Tuners. John's (now G8CQX, previously G4UAZ) original active loop antenna design upon which the M0AYF version is based. Amateur Satellite Contact with a HT and a Whip Antenna 2 weeks ago. This neat little box was designed specifically for use with a counterpoise (i. The 6m band is his most popular one, since he get best results on this band. In addition to having a lower angle of radiation than the horizontally polarized loop, they also reduce the local QRM (stations within about 500 miles) by a couple of S-Units. It is designed for 50-ohm use at QRP-. In article , Irv Finkleman wrote: A chum of mine has the subject antenna with a bad motor. When disassembled the antenna easily fits in a suitcase or backpack. We produce a professional quality magazine (QRP Quarterly), organize an annual conference at Dayton ('Four Days In May' or FDIM), and sponsor various QRP contests and awards. Enjoy both DX and local contacts mounted vertically. The MFJ-1788 Super Hi-Q Loop Antenna is ideal for restricted space locations. This loop antenna needs to be run in the horizontal plane. This multiband antenna covers the 80, 40, 30, 20, 17, 15, 12, 10 and 6 Mx Amateur bands. Page 1 MFJ-1886TR Receive Loop Antenna INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 COPYRIGHT 2015 MFJ Enterprises Inc. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. Living as I do in a flat with a complete ban on external antennas, I turned to the loop, having for many years experimented with this type of aerial in various forms. Antenna Loop, Verona, Italia, VHF. The Site Master doesn’t go below 5 mhz, so results for 80m aren’t shown here. I would estimate that its performance is about as good as an outdoor dipole. Performance objective. Rugged all welded aluminium construction, it is fully weatherproof and does not require a separate control cable, the coax carries the signal and the DC control signals for tuning. This configuration is best suited for working long haul DX. May 28, 2016 October 30, 2010 by John Huggins. For more details look at the Active Antenna Amplifier Technical Section. HF Magnetic Loop Antennas suppliers category is a curation of 13 web resources on , MTM Scientific Radio Loop Antenna, Alpha Antenna, Stealth Telecom. Minimal additional efforts are needed to complete this active antenna project. MFJ from Starkville (MS), USA is dealer and manufacturer of a very wide range of antennas and accessories for amateur radio. Chameleon Antenna-- An innovative antenna design for fixed / portable or mobile use, and covering 6-80 meter bands! VERY nicely made, too! Antenna Magic Page-- Ray Jurgens, KQ6RH. COPYRIGHT 2018 MFJ Enterprises Inc. Introduction Of the many different antenna projects I have built for HF, the most interesting and rewarding project was the small transmitting loop. HF Flagpole antenna for 10-80 Meters. Maybe proximity to ground, too. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Performance objective. MFJ-934 Antenna tuner plus artificial ground, dual-tuner combination! $499. Antenna Loop MFJ-1786 10-30 MHz Antenna per chi ha spazi limitati - appartamenti, camper, soffitte, l'antenna loop MFJ1786 , funziona in modo continuativo da 10 a 30 MHz, esiste una seconda versione la MFJ-1788 funzionante da 7 a 21MHz. The tuning is fairly sharp, but is not a big deal for me as I operate mostly JT65 and JT9 these days and the sub-band for these modes is only about 4KHz. Aug 11, 2014 - MFJ-1786 SUPER HI-Q LOOP, 36~ DIA, 10-30 MHz (531×799) like to have one to try out. It is designed for portability, and can be assembled or disassembled in about a minute. EB3FFP Marc - Spain - Midi loop. I have been looking at these for years, and have always been fascinated by mag loops. MFJ Antenna Analyzer Operation Guides. Review of MFJ -9232 QRP Mini Loop Tuner (AD#90) Posted by MtMotorStables at 4:33 PM. The article MFJ-1786 loop antenna - measurements and NEC-4. If you do not have room for such a large loop all you have to change is: The two cross arms should be 33. 3-40 MHz-10 to +10 dB: Indoor. It includes a detachable 20 inch antenna. An issue with the MFJ small transmitting loop tuners is that you have to be literally 1-2 feet or less from the loop while tuning if you use it in their preferred configuration. Shop for 500 With Pre Woven Loop, offering cheap 500 With Pre Woven Loop listed today from at huge discounts from Ebay. MFJ-935B 150W Loop Antenna Tuner 5. This unit works with all brands of analyzers. Loop in horizontal position omni directional is, so you don't need a rotator. After several videos and disappointments, the MFJ-1788 Hi-Q Loop Antenna didn't work on 40 m. For sale is an MFJ-1788 loop antenna, including remote tuning unit (does not include feedline) The 1788 model covers 7-21 MHz. 1 result for mfj loop antenna Save mfj loop antenna to get e-mail alerts and updates on your eBay Feed. 914m) DIA 10-30 MHz loop at 10. For this scenario, the loop is loaded with some impedance being the receiver input impedance transformed by the ideal n:1 turns ratio transformer. Add (PUB) MFJ-1796: MFJ 1796 Vertical Antenna. Simply use the MFJ-4117 Bias-T and MFJ-1312D plug-in AC supply that come with the loop, or use any external 12-volt DC source for your portable setups. Antenna, Super Hi-Q Loop, Remote Tuning Type, Horizontal, Omni-directional Small Loop, 150 W, 10-30 MHz, 110 V. It is designed for 50-ohm use at QRPpower input on all modes. The null in reception that is located at right angles to the plane of the loop can be used for interference reduction. If you were to scale our 1" tubing model to the 3. Buy on eBay. Loop antennas for outstanding directional radio listening and reception monitoring of medium wave, long wave, short wave and HF DX. In my previous blog on the topic of software defined radio , I provided a quickstart guide to using gqrx, GNU Radio and the RTL-SDR dongle to receive FM radio and the amateur two meter (VHF) band. Antenna Loop MFJ-1786 10-30 MHz Antenna per chi ha spazi limitati - appartamenti, camper, soffitte, l'antenna loop MFJ1786 , funziona in modo continuativo da 10 a 30 MHz, esiste una seconda versione la MFJ-1788 funzionante da 7 a 21MHz. These tuners are designed to be directly connected to the base of the actual antenna loop. Available separately, the MFJ-57B or MFJ-58B PVC Cross Loop Antenna Kits can be used to make a compact self-contained antenna system requiring no ground, radials, or counterpoises. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. I was able to disengage the amplifier, and using the internal tuner continue to […]. SMALL HF MAG-LOOP ANTENNA TUNER ( For 40m-17m Bands) Photographs of the small HF Loop Tuner and the two loops. MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual 2010 MFJ Enterprises, Inc. This antenna isn't for everyone, but it fits my bill perfectly. The MFJ-731 Analyzer Filter is also ideal for any application requiring a low. 5 Element LPDA Beam VHF UHF Cell WiFi Jamming Antenna. Is this because it is low (22-24 feet) off the ground? I could hang a longer dipole, but not higher. create a very compact HF antenna. " Glad to hear you are having a good time with. Recently I purchased a Mini 60 antenna analyzer. 1 result for mfj loop antenna Save mfj loop antenna to get e-mail alerts and updates on your eBay Feed. The End Wire Size can range from 16 AWG to 12 AWG. Cessna R182 Unknown Part - In Wing Fuselage Antenna Nav Glideslope Loop For Sale Online. If antenna impedances cannot be measured, MFJ AdaptiveSearch T M searches only the relevant components that can match your antenna giving you ultra-fast tuning. Re: MFJ-1786X Magnetic Loop 10 - 30MHz Antenna for CB Post by 108EH002 » 20 Nov 2014, 01:22 Just thought there maybe have been a few on here that had tried one,was actually going to use it for at the side of the river forth/up a hill static. Out of stock. These antennas have length nearly equal to the intended wavelength. Still I thought that I would explain why I chose this as my next field analyzer. Using A Mag Loop in the Field zTUNING: zHigh-Q Makes Tuning by Receiver Noise Easy and Fairly Accurate zALWAYS check SWR before APPLYING Full POWER zCan Use MFJ-249/269 or other Antenna Analyzer, but Stand as Far from Loop as Possible zStep in, Step out Dance Dance Revolution!. VHF-UHF Log Periodic Antenna-North Yagi Antenna. While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. best offering to date. Although this online calculator is intended to assist with designing and building homemade, ham radio loop antennas for use in the HF bands, magnetic antennas have been. The MFJ-58B PVC Cross Loop Antenna Kit includes a PVC Cross Mount that plugs into the top of the Loop Tuner for individually mounting three separate 10-gauge wires (13, 7, and 4 ft in length). In all other respects it is identical to the MFJ-1786 using the coax cable. You get all the best features of the MFJ-941E Cross-Needle Antenna Tuner and the MFJ-931 Artificial Ground in a single compact 10 5/8W x 3 1/2 H x 8 D inch cabinet -- and the MFJ-934 cost less. When disassembled the antenna easily fits in a suitcase or backpack. Total failure. The article MFJ-1786 loop antenna - measurements and NEC-4. The MFJ-1886 Receive Loop gives you tremendous power to copy weak stations through impossibly strong levels of QRN or QRM. Aug 11, 2014 - MFJ-1786 SUPER HI-Q LOOP, 36~ DIA, 10-30 MHz (531×799) like to have one to try out. I then set the transceiver up to analyze the antenna and saw a 3. Using the software at the bottom of this page, I worked out that a 36cm length of wire, will need a capacitance of around 3. I have a MFJ-1786 magnetic loop antenna which covers 10-30 MHZ. The biggest problem with a Mag-Loop is, High-Q (tight tuning) and small changes in frequency requires retuning which is sharp and very directional. Both use a similar tuning mechanism which tunes the antenna from a box connected between the antenna and the transceiver. Cut the loop to specified length, mounted it to the controller/tuner box. And I have made contacts on all bands in that range. Be prepared and able to communicate in case of emergency with the largest selection at eBay. The MFJ loop is approximately 1 metre in diameter,…. I have had a problem with getting 20m to tune. The MFJ-933 Loop Tuner TM is a small, versatile, high-efficiency device that turns any wire loop into a high-efficiency multi-band transmitting loop antenna system designed for 50-ohm use at 150 Watts maximum input (all modes). 05-30 MHz: NTi: MD300DX Wideband Active Antenna 9 kHz - 300 MHz: ML060 Wideband Active Antenna 9 kHz - 60 MHz: Par: EF-SWL End-Fed. " My use of loop antennas has been on the larger size--my current HF antenna is an 80-meter delta loop fed with 450 ohm ladder line into a 4:1 balun and then into my Drake MN-4. I have found with this antenna there is no way to tune it below 15m. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. First, I use the MFJ-1903 Tilt-Over base. The MFJ is a sturdy piece, and its stuck being large. We mostly have very low humidity and condensation is not usually an issue. When it arrived I found a bonus. One set of Bias Tee and power supply was never used. s monthly publication) with full permission of the RSGB subject to the inclusion of the f ollowing. The 1868 covers a receive range of 25-1300 MHz with a transmit range of 50-1300. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. I picked up a W6LVP loop antenna to compare with the MFJ loop. It looks quite different to the expected behavior of the underlying loop, but it does contain an arc albeit rotated and offset. Found some tech notes about loop antennas at MFJ. Find a roll of wire. The MFJ loop is approximately 1 metre in diameter,…. Hamcity Proudly Accepts: Need Help? Click Online Support. A brief overview of my MFJ 1788 loop antenna. Antenna Loop, Verona, Italia, VHF. best offering to date. The idea for this 2 meter full wave loop antenna came from QST. 7 thoughts on " Frank recommends the MFJ-1886 magnetic loop antenna " Kenneth Wigger February 18, 2018 at 6:19 pm. I just happen to have a Palstar MW550P Preamp Tuner for SWL and AM BCB DXing. If one is not available, see the instructions below for testing with a transmitter and receiver. The MFJ-1788 Super Hi-Q Loop Antenna is ideal for restricted space locations. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. Rugged all welded aluminium construction, it is fully weatherproof and does not require a separate control cable, the coax carries the signal and the DC control signals for tuning. Mark Connelly, WA1ION - South Yarmouth, Cape Cod, MA, USA - rev. Supplied to professionals and radio amateurs alike. Besides that, the Baby Loops' tube has 50mm thickness that should give a beter radiation pattern, especially on the 40 meter band. The magnetic loop is a very efficient antenna. MFJ 1786 Magnetic Loop Amateur Ham Radio Antenna - $250 (NW Marion County) MFJ 1786 Magnetic Loop Amateur Ham Radio Antenna For Sale:The MFJ 1796 is a 36 inch diameter magneticloop antenna that lets you operate 10 through30 MHz continuously, including the WARC bands!It is ideal for limited space -- apartments, smalllots, motor homes, attics,. com in 10 categories. 73 dB: Loop antenna: AH-521-H: Cross loop kit: For MFJ-933/935B/936B: MFJ-1020C: 0. However, since most DX on 6m is horizontally polarized, he needed a horizontal antenna. When the power is off, the tuner is placed in. 10-30 MHz Hi-Q Deluxe Loop Antenna $411. In the past wide band HF loop antennas have not been cheap, normally costing $300+ dollars from manufacturers like Wellbrook. For these tuners, the expectation is that you mount the frame for the loop directly on the top of the tuner. If the inductor circumference approaches ¼ of a wavelength or more then the antenna would. MFJ 1788 Loop Antenna Fixed (#65) Posted on May 6, 2017 by. After owning the IsoLoop and doing some research on the Internet on small transmitting loop antennas there is quite a large (and cult-ish - in a good way) community of loop builders. RECORDING MP3 FILES. It’s different from most. I was able to disengage the amplifier, and using the internal tuner continue to […]. Great deals on MFJ Radio Antenna Tuners. MFJ-9232 HF QRP Mini Loop Antenna Tuner 25W Multi Band Transmitting System NEW. fair price. Used, MFJ 1886x RX loop antenna ( x2 ) for ham rad. MFJ 1886x RX loop antenna ( x2 ) for ham radio reception Kirkcaldy, Fife Selling my TWO MFJ 1886x ( RX only ) antennas complete with the bias Tee units and power supplies. Page 9 An operational height equal to 1/2 diameter of the loop antenna is recommended to prevent detuning and excess ground losses when using the MFJ-9232 Mini Loop Tuner loop antenna system. SKU: MFJ 1786X Category: Base Antennas Feature: HF Brand: MFJ In stock £ 599. Cut the loop to specified length, mounted it to the controller/tuner box. When I wrote the article on the AES IsoLoop I didn't know that MFJ Enterprises has a wide selection of small transmitting loop antenna tuners. MFJ-935B 150W Loop Antenna Tuner 5. The Radio is working. The MFJ-931 tunes the counterpoise to series resonance which in turn, translates into improved ground efficiency and improved antenna performance. 10 - 30MHz 3ft dia. Average Rating 0. Total failure. The measurements below are for building a Double Bazooka Near Vertical Incident Skywave (NVIS) 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. No connecting coaxes or switches are supplied. Aug 11, 2014 - MFJ-1786 SUPER HI-Q LOOP, 36~ DIA, 10-30 MHz (531×799) like to have one to try out. 1: Calculator results for a loop with a diameter of 1 m (3. Magnetic Loop Antennas - M0UKD - Amateur Radio Blog. RF signals are electromagnetic waves that consist of an electric. For those with no trees, little room, maybe a patch of grass, or a deck or a sliding glass door where you can erect an antenna and only temporarily, for the bands above 7 MHz, I'd suggest an antenna commonly called a "magnetic loop". It is designed for 50-ohm use at QRPpower input on all modes. 3-30 MHz With Current Meter. The MFJ-1786X is a 36-inch diameter aluminium loop that covers 10-30MHz. Note the low angle of radiation. This means as long as the circumference of the loop is less than one wavelength of the frequency to be used, it will work. It instantly turns into a small, high efficiency multi-band transmitting loop antenna! You can operate 3. net Abstract A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. For those with no trees, little room, maybe a patch of grass, or a deck or a sliding glass door where you can erect an antenna and only temporarily, for the bands above 7 MHz, I'd suggest an antenna commonly called a "magnetic loop". This is not strictly true - there is an intense electric field around the tuning capacitor part of the loop. My Loop Antenna November 20, 2013 14 Receive Properties of Electrically-Small Loops •Loop antenna is tuned to a resonance on receive by adjusting the tuning capacitor •Atmospheric noise dominates over receiver noise at HF. This multiband antenna covers the 80, 40, 30, 20, 17, 15, 12, 10 and 6 Mx Amateur bands. Active Antenna Amplifier Kit is available for purchase. This unit works with all brands of analyzers. I then set the transceiver up to analyze the antenna and saw a 3. MFJ 1786 Magnetic Loop Amateur Ham Radio Antenna For SaleThe MFJ 1796 is a 36 inch diameter magneticloop antenna that lets you operate 10 through30 MHz continuously, including the WARC bands!It is ideal for limited space -- apartments, smalllots, motor homes, attics, or mobile homes -- orif you are limited by HOAs. This loop antenna needs to be run in the horizontal plane. COPYRIGHT 2018 MFJ Enterprises Inc. The MFJ-1786 Magnetic Loop Antenna Well, I bit the bullet today and placed my order with MFJ for an MFJ-1786 magnetic loop antenna. It is designed for 50-ohm use at QRPpower input on all modes. Both use a similar tuning mechanism which tunes the antenna from a box connected between the antenna and the transceiver. Updated 8/17/2014. Drape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. Antenna wire can be #14 hard-drawn antenna wire. I can not see a lot of difference between them. Chiamaci +39 045 8903104. Add to Wish List Add to Compare. If you do not have room for such a large loop all you have to change is: The two cross arms should be 33. Short Beverage or EWE 40-80 Meters: 1. MFJ was able to make this small loop antenna radiate nearly as well as a full size dipole by paying special attention to the electrical and mechanical construction of this antenna. Keep the coax from the MFJ to the clip leads as short as possible. ~ € 20 for receive only or second hand PL-259 to SMA male pigtail, up to 50cm, RG58 Joins the ATU to the upconverter. Page 1 MFJ-1886TR Receive Loop Antenna INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 COPYRIGHT 2015 MFJ Enterprises Inc. The MFJ-1786X is a 36-inch diameter aluminium loop that covers 10-30MHz. Small loop antennas can be very effective portable antennas, and the little MFJ-932 Loop Tuner enables you to make a particularly compact and efficient loop antenna system. Issue, 56 February 1998. After wrapping the foil, mount the small loop with duct tape or tie wraps, and then insert the "trombone" copper tubing. Drape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. Dig out previously unreadable signals and track down annoying sources of interference with the MFJ-1886 HF Receive Loop Antenna! MFJ-213. This is not strictly true - there is an intense electric field around the tuning capacitor part of the loop. LOOP TUNER, 3. 3-30 MHz With Current Meter. If you were to scale our 1" tubing model to the 3. Describe your experience with the MFJ-1788 Super Hi-Q Loop and tell us why you give it the rating you did (required). The Midnight LoopThe Midnight Loop MassCon 2010MassCon 2010 G. The magnetic loop is a very efficient antenna. Once I got the MFJ-207, I trimmed my copper Loop to 12 feet so I could try and make some SSB contacts on 20M. I’ll keep plugging on this antenna! Ask Dave Episode 63 Review of MFJ-1788 Mag Loop Antenna (#63) This video reviews the MFJ-1788 magnetic loop antenna, which purports to cover 40 meters through 15. When disassembled the antenna easily fits in a suitcase or backpack. Field upgradeable firmware. Note: The top of this page has links to various receiving antennas such as Beverage, "magnetic" loop, and vertical low-noise DX receiving antennas. LNR Precision makes a remotely tuned loop but theirs is limited to 15 watts. >73, >Fernie/KE4MAI. HF Antennas Especially stealth models for those in an HOA By Dave Land KD5FX. MFJ-1621 Portable Antenna. RF Circuit Building Blocks Page. O Box 645 Glenville, NC 28736 Voice: 828-743-1338 Fax: 866-304-8479. Page 9 An operational height equal to 1/2 diameter of the loop antenna is recommended to prevent detuning and excess ground losses when using the MFJ-9232 Mini Loop Tuner loop antenna system. The idea for this 2 meter full wave loop antenna came from QST. Notes:-Photograph of the inside of the Loop tuner. Dig out previously unreadable signals and track down annoying sources of interference with the MFJ-1886 HF Receive Loop Antenna! The MFJ-1886 Receive Loop gives you tremendous power to copy weak stations through impossibly strong levels of QRN or QRM. Aug 11, 2014 - MFJ-1786 SUPER HI-Q LOOP, 36~ DIA, 10-30 MHz (531×799) like to have one to try out. This means as long as the circumference of the loop is less than one wavelength of the frequency to be used, it will work. I used / am using this MFJ-1786 antenna at various QTHs from a mountain top overlooking the Great Smoky Mountains National Park, to our beachfront condo 100 yards from the Gulf of Mexico to our current home in Potomac, Maryland 15 miles from the White House and Congress - and from all three locations worked a total of over 100. MFJ-1786 Loop Antenna - My Stealth Antenna Installations K3rrr. Guess it is time to purchase phase inversion noise cancel device like the Timewave ANC-4 or MFJ equivalent. These tuners are designed to be directly connected to the base of the actual antenna loop. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. I purchased the large loop tuner from MFJ. m Copper loop. Small Coaxial Loop tuned for specific band. With the MFJ-1886X you get: - Perfect loop balance for deep precise. This is the MFJ 9020 QRP / CW rig. This one has the optional CW keyer and audio. MFJ 1786 Magnetic Loop Amateur Ham Radio Antenna - $250 (NW Marion County) MFJ 1786 Magnetic Loop Amateur Ham Radio Antenna For Sale:The MFJ 1796 is a 36 inch diameter magneticloop antenna that lets you operate 10 through30 MHz continuously, including the WARC bands!It is ideal for limited space -- apartments, smalllots, motor homes, attics,. 2 Home Made HIGH POWER Magnetic Loop. I used an MFJ-259B to check the SWR and found that it had changed considerably from the indoor test. The MFJ-9232 is probably the smallest loop tuner. Building an antenna and receiving ham and shortwave stations with SDR. Click here for a loop antenna rotator control diagram. ANTENNE Amateur Radio Station KP4MD VE7OR - Callsign Lookup by QRZ Ham Radio MFJ-264N DUMMY LOAD, 1. The Loop Antenna A loop antenna is an antenna consisting of loop of electrical conductor such as wires, tubing, or solid metals. The MFJ-1786X is a 36-inch diameter aluminium loop that covers 10-30MHz. Due to the fact that in Monaco it is very difficult to install an ham radio antenna for a wide range of reasons, I had to choose a vertical, multibands antenna with a reasonable lenght. In all other respects it is identical to the MFJ-1786 using the coax cable. I find when I point the loop to the offending noise source, the noise to signal ratio is much higher than that of my regular dipole antenna. W6LVP amplified receive-only magnetic loop antenna (boy is that mouthful): The W6LVP mag loop is a complete receive antenna system delivering top-of-the-line performance to amateur radio operators and SWLs – particularly for those with space and/or budget limitations. Generally there are two types – small electric dipole (or monopole) antenna and small magnetic loop antenna. Amateur Satellite Contact with a HT and a Whip Antenna 2 weeks ago. Palstar tuners, speakers, and accessories are for amateur radio operators who demand the highest quality of contemporary engineering designed for Ham Radio. MFJ does sell an optional BCI filter unit for the 259B which eliminates the problem. Call 310 390 8003 or Email Us. Re: MFJ-1786X Magnetic Loop 10 - 30MHz Antenna for CB Post by 108EH002 » 20 Nov 2014, 01:22 Just thought there maybe have been a few on here that had tried one,was actually going to use it for at the side of the river forth/up a hill static. You get all the best features of the MFJ-941E Cross-Needle Antenna Tuner and the MFJ-931 Artificial Ground in a single compact 10 5/8W x 3 1/2 H x 8 D inch cabinet -- and the MFJ-934 cost less. Small loop antennas can be very effective portable antennas, and the little MFJ-932 Loop Tuner enables you to make a particularly compact and efficient loop antenna system. This antenna works, unlike some that ship from the factory. 5-30mhz, 110vac The MFJ-1886 Receive Loop gives you tremendous power to copy weak stations through impossibly strong levels of QRN or QRM. 150 Watts With Current Meter. diameter loop antennas that work on 10 through 30 MHz continuously, Not Yet Reviewed. Average Rating 0. In the beginning, I tried octagonal 3/4" copper loops with homebrew 'trombone' capacitors wrapped in Teflon tape and driven by a surplus screwdriver motor. Small transmitting loop antennas, commonly called "magnetic loops" or "mag loops," can give surprisingly good performance when they are carefully designed and constructed. PA3GZK did the test with a Kenwood TS-480 tuned to the 80 meter band and the noise signal. I am glad that you are enjoying your MFJ loop. 5 Element LPDA Beam VHF UHF Cell WiFi Jamming 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. Does anyone know whether the same remote control unit works for both models? In which case, I only need the MFJ-1788 loop and not a second remote control unit, which may save me some cost if I can source just the loop component. No ground, radials or counterpoises needed. LNR Precision makes a remotely tuned loop but theirs is limited to 15 watts. Large yellow doorknob 50pF 5KV capacitor is. 10 watt HF 17 meterband amplifier. The antennes I've ordered a month ago aren't in yet (shame on you vpa-systems. CIAO Radio Loop Antenna L-101 0. Rain Gutter MFJ Loops MFJ1780 14-30 MHz Loop MFJ1786 10-30 MHz Loop. Placement on the side of a house or garage at eaves level is acceptable as. Notes:-Photograph of the inside of the Loop tuner. MFJ-916BM Duplexer 1. It was simply tied to the pipe with string. This is not strictly true - there is an intense electric field around the tuning capacitor part of the loop. In this view, you can see the PVC pipe mast and cross-arm assembly which supports the two turn CATV cable loop. Loop in horizontal position omni directional is, so you don't need a rotator. No ground, radials or counterpoises needed. I am able to get 25-30 dB noise rejection and it brings my received signal into perfect clarity. All Antennas, Magnetic Loops, Portable. Building an antenna and receiving ham and shortwave stations with SDR. This is the completed antenna. The following photos show a Magnetic Loop Antenna that is a complete lash-up in terms of the mechanical construction yet it is giving some surprising results. Loop and pre-matching circuit Uses a ladder line as impedance transformer The length of the ladder line is approx. MFJ-1786 Loop Antenna – My Stealth Antenna Installations. Shielded-Loop antennas have some nice properties that make them desirable as portable receiving antennas. I picked up a W6LVP loop antenna to compare with the MFJ loop. Therefore, the positioning of the rear antenna connectors and the PVC top mount are identical on all models so the optional MFJ-58B Cross Antenna Kit (more discussion below) will fit all the different. Fast & Free shipping on many items!. Magnetic loop receive antennas are a great weapon in the fight against natural and man-made noise. Vertically polarized loops work better for DX whenever the antenna must be mounted closer to the ground. The biggest problem with a Mag-Loop is, High-Q (tight tuning) and small changes in frequency requires retuning which is sharp and very directional. I used / am using this MFJ-1786 antenna at various QTHs from a mountain top overlooking the Great Smoky Mountains National Park, to our beachfront condo 100 yards from the Gulf of Mexico to our current home in Potomac, Maryland 15 miles from the White House and Congress - and from all three locations worked a total of over 100. More Info and Demo Photos. In fact it can be transformed in two simple steps. 5-30mhz, 110vac The MFJ-1886 Receive Loop gives you tremendous power to copy weak stations through impossibly strong levels of QRN or QRM. This antenna has also been used successfully for the reception of QRSS signals in the 20, 30, 40, 80 and 160 Metre bands) Circuit details and construction notes. Note that it sometimes stated that a magnetic loop has only a magnetic component in the near field. MFJ-934 Antenna tuner plus artificial ground, dual-tuner combination! $499. 392M HF mobile antenna coil all band ham marine mars cap Military Grade Mobile HF Antenna Base Mount - HF Radio Hi-Q Military Antennas - NVIS / HF Combination Antennas. 20 amp regulatable power supply new design. The antenna Q is very high because the radiation resistance is small compared to the reactance of the loop and the VSWR bandwidth is very narrow. For sale is an MFJ-1788 loop antenna, including remote tuning unit (does not include feedline) The 1788 model covers 7-21 MHz. Mechanically, the MFJ loop tuners are all very similar. Used, mfj antenna tuner 948. The loop is Based on Don Moman's famous loop his drawing is at the bottom of the page. The MFJ-1788 Super Hi-Q Loop Antenna is ideal for restricted space locations. I have worked 24 countries with my 20 inch loop. Part # MFJ-1886TR Manufacturer MFJ UPC Availability This product requires special order. MFJ from Starkville (MS), USA is dealer and manufacturer of a very wide range of antennas and accessories for amateur radio. You get all the best features of the MFJ-941E Cross-Needle Antenna Tuner and the MFJ-931 Artificial Ground in a single compact 10 5/8W x 3 1/2 H x 8 D inch cabinet -- and the MFJ-934 cost less. This allows me to raise and lower the antenna without any help. The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. The DF Loop is NOT a resonant antenna. The electrical length of the full 36 foot speaker wire transmission line used with the 40 meter horizontal loop antenna 15 was determined by disconnecting it from the antenna and shorting those ends together and attaching the noise bridge to the station end of the feed line. Operating portable QRP can be even more of a challenge. Note the low angle of radiation. 3-30 MHz With Current Meter 5 out of 5 stars 3 product ratings 3 product ratings - MFJ-935B 150W Loop Antenna Tuner 5. Loop and pre-matching circuit Uses a ladder line as impedance transformer The length of the ladder line is approx. 95 Online Payment System. QRZ link to ON6MU. 44 feet) diameter radiator loop of DX Engineering DXE-400 MAX brand of LMR-400 coaxial cable, mounted either horizontally or vertically on a balcony railing near the center of the high rise apartment building in Figure 1. product manual, schematic, reviews, free download files, and much more. Living as I do in a flat with a complete ban on external antennas, I turned to the loop, having for many years experimented with this type of aerial in various forms. Hamcity Proudly Accepts: Need Help? Click Online Support. 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. Describe your experience with the MFJ-1788 Super Hi-Q Loop and tell us why you give it the rating you did (required). 10-80 Meter Alpha Loop, 100W 10-40M, 20W 40-80 magnetic. Multiband operation is achieved by use of 300 ohm balanced line fed to an antenna tuner.