Mfj loop tuners

  • View and Download MFJ -1778M G5RV JR. Loop as purchased, with pvc tape covering loop Control Box I downloaded the manual and schematic from the MFJ website and I saw there were conspicuous warnings about using an 'isolated' power supply both in the manual and on the back of the controller, with ominous warnings of damage if you didn't. MFJ Small, high efficiency Loop Tuners™ Click here to read Phil Salas review of the MFJ-936B, MFJ-935B, and MFJ-933. They clearly aren't for everyone--the tuning range is quite limited for a given transmitting loop size, and need to be mounted at the loop feedpoint to obtain good results. MFJ HF Cobweb Wire Dipole Antennas cover multiple bands and are suitable for many restricted space applications. Antenna Tuners Automatic and Manual Antenna Tuners, Remote Antenna Tuners For Balanced and Unbalanced Lines, Long Wire Antennas, Loop Antennas Product Compare (0) Used to supply power to antenna tuners or amplifiers or for remote control of solenoids over the coax cable. MFJ Enterprises, Inc. One year warranty Many listed MFJ products are in stock and can be shipped same/next day! Bencher, RigExpert and BetterRF products are shown below the MFJ chartMFJ. com. 12 to 67 pF. MFJ has an instruction sheet with reccomended loop sizes for different bands. This unit can repeat messages continuously, insert timed pauses within messages, and insert an auto-incrementing serial number. MFJ-974HB MFJ Enterprises. gigaparts. anyone have experience with these tuners?? Stan _____ Doublet, horizontal loop, vertical loop, quad, double extended Zepp, Lazy H, W8JK antennas all give efficient multi-band operation when fed with balanced lines. Shortwave Antenna Tuner Schematic Thanks to Richard at MFJ for his support and donating this antenna for my review. Product is in production. 6 MHz with the tuning capacitor that is presently on it. Delta Loop antenna This DeltaLoop antenna has a length of 125 meters, divided into three sides of 40, 42 and 43 meters. MFJ-935B, Reviews: 11, Average rating: 3. In this section you can find synonyms for the word "mfj tuners", similar queries, as well as a gallery of images showing the full picture of possible uses for this word (Expressions). The MFJ-2990 provides low SWR across the full 160-6 Meter frequency range with an antenna tuner. The MFJ-971 is also a perfect mate for any of todays ultra-compact SSB radios. MFJ-9232 HF QRP Mini Loop Antenna Tuner, 25W. 2 : 3-4 metre loop made from either 3 or 4 one metre length of 20m wide aluminium strips. Eight-Band HF Portable Antenna. It instantly turns into a small, high efficiency multi-band transmitting loop antenna! When coupled to a low-resistance loop conductor such as a copper strap, copper tube, or large gauge copper wire, MFJ loop tuners can provide a high efficiency transmitting loop antenna system. The purpose of an automatic antenna tuner (auto-tuner) is to transform (match) a complex load impedance to 50Ω resistive, and to maintain the matched condition automatically as the operating frequency and load impedance vary. MFJ Official Website: http://www. Johnson Matchbox For decades, the Johnson Matchbox has been the standard of comparison for balanced line tuners. They have fiberglass spreaders and wire elements Find MFJ HF Cobweb Wire Dipole Antennas MFJ-1838 and get Free Standard Shipping on orders over $99 at DX Engineering!Follow the links in the table to read reviews. The MFJ-971 has the potential to be a great portable tuner. Product marketing started in October of 1972, and the first product was a high selectivity filter that would enable a receiver to separate one Morse code signal from scores of other signals that were being transmitted over Using our free SEO "Keyword Suggest" keyword analyzer you can run the keyword analysis "Mfj Tuners" in detail. Amateur Antenna Tuners The MFJ-974HB is a fully balanced true balanced line antenna tuner. Has anyone used this antenna? I am looking for any user feedback as to how well it works and ease of operation, especially tuning for receive. Mfj 269 Repair Manual High efficiency Loop Tuner for 3. mfj-868b world's largest hf+ 6 m swr/watt meter 20-2000 watt ranges Amateur Antenna Tuners Larger View The MFJ-926B HF Automatic Remote Antenna Tuner, the IntelliTuner™, lets you rapidly tune any antenna automatically: unbalanced or single-wire. 95. The control head supplies control voltages to the loop through the coaxial feedline. Find More Integrated Circuits Information about Drop shipping 1 30 Mhz QRP Manual Antenna Tuner kit for HAM RADIO CW shortwave,High Quality antenna. mfj-267 1. With a capability of 1500 Watts SSB and CW, coupled with automatic tuning, your high-power station can now operate essentially hands-free even when frequency and band changes are made. I've heard of guys using similar magnetic loops on 80m but they are either small and lossy or huge and rediculously narrow band, like 3khz. Welcome to our ham radio products page. MFJ IS NOW THE ONLY AUTHORIZED NORTH AMERICAN SALES AND SERVICE DISTRIBUTOR FOR XIEGU PRODUCTS! MFJ is the exclusive North American Distributor of this new ultra-portable multimode HF transceiver. instructions online. This antenna is new was put up for 2 days to test. Any external antenna tuner and many transceiver internal antenna tuners can easily match this antenna across the full frequency range. Hf loop antennas made out of something that almost EVERYONE has at their home. was the internal atu is set at 3. Here is the famous MFJ loop antenna in action, available at www. wire or tube which doesn’t make that big of a loop and gets out a lot better on 20m. Listed below are the "pre-owned" items we have in stock as of the date the website is updated, which is usually on Thursday night of each week. The SOTA tuner can be either built for 40-15 or 80. MFJ MFJ-993B MFJ993B MFJ-993 Original 1. It is designed for 50-ohm use at QRPpower input on all modes. It is designed for portability, and can be assembled or disassembled in about a minute. 8 - 30 MHz. The only other antenna available to me for direct comparison is the MFJ magnetic loop, and the comparison shows just how good an antenna the loop is. In this section you can find synonyms for the word "Mfj Tuners", similar queries, as well as a gallery of images showing the full picture of possible uses for this word (Expressions). This multiband vertical designs provide 9 band coverage encompassing the 6, 10, 12, 15, 17, 20, 30, 40 and 80 meter bands. 3 - 30MHz, 150W, w/Current/SWR/Watt Drape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. mfjenterprises. by MFJ. • When thinking about antenna tuners and SWR, it's Loops. Performance is as you would expect from a 20m dipole at a fairly low height. 9/5, MSRP: $199. The first was the MFJ-1782, the model that covers 30m - 10m with the manual control unit, to save a bit of money. · MFJ Manual · MFJ Loop · MFJ Tuner · MFJ Antenna · MFJ Analyser · MFJ 259 The MFJ site is designed to help you quickly and easily find the latest MFJ reviews, field-service instrument costing hundreds or even thousands of dollars more. Reduced Price New Expand. 7 MHz with a full 150 Watts. g. This antenna covers 5 HF bands and the 2 meter band. West, Toronto Ontario M3N1V7 Tel: 416-667-1000 sales@radioworld. Low Power Autotuner Life is too short to go QRP. COM - Antenna Tuners, Antenna Tuner Basics, K0KP's Tuna Tin 2, What tuners do, QRP Random Wire Tuner. Cushcraft achieved a major breakthrough in the development of an HF multiband vertical antenna that has been specifically designed for use with a tuner and amplifier. Antenna Tuners • An antenna tuner, transmatch , doesn't really TUNE your antenna OR ANY PART OF IT! • What an antenna tuner or transmatch does do, is transform the impedance at the antenna feed output at the radio to a value that your transceiver can handle, (typically 50 Ohms). MFJ-1788 Loop. CB RADIOS The MFJ-16010 is a variable L-network random wire antenna tuner designed to It is an ideal manual ATU for the IC- 706MKIIG, FT100D and FT817 and other. Antenna Tuners Sort by: Sort by Featured Items Newest Items Bestselling Alphabetical: A to Z Alphabetical: Z to A Avg. The AMERITRON ALS-1300 is a solid state near legal limit™ FET no-tune Amplifier. 5" x 2. Drape a wire around a bookcase or window; attach both ends to an MFJ 936B Small High-Efficiency Loop Tuner™ and they instantly turn into a small, multi-band transmitting loop antenna! MFJ 936B tuners include an RF current and SWR meter to help maximize performance when operating. 5-30mhz, 150w, w/current meter Drape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. was originally founded by Martin F. It is a small, compact tuner that has a sensitive SWR circuit allowing precise tuning with low power thanks to its 6w FSD setting and it has outputs for coax, wire and balanced feeder (although I won't talk about the MFJ 'heavy duty' 1:4 vo In addition, specific models mentioned in the ham radio forum Like antenna analyzers, ham radio antennas bases, antenna masts, antenna mounts,dummy loads power supplies, batteries, battery chargers, power strips, and other power-supplying products and accessories, magnetic loop, manual antenna tuners, automatic antenna tuner and more are here MFJ Magnetic Loop HAM antenna - $300 Salem I only played with this for a couple weeks while 2 position a b switch for ham antennas. 94 $ 75 94. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. The MFJ loop finally has a decent SWR match!! - Homemade vertical mounting. Jue, K5FLU, in 1972. Find great deals on eBay for mfj loop tuner. It instantly turns into a small, high efficiency multi-band transmitting loop antenna! You can operate 5. Palstar Tuners. Hammer the ends flat, drill holes, and connect it to the MFJ. loop tuner, 3. I have been feeding both a AEA loop and a sterba curtain and never had a problem. Each handles 1500 Volts RMS and has a 1/4”diameter by 21/2” long shaft. F. There are three models of loop tuners available: The MFJ-933B, MFJ-935B, and MFJ-936B. The company began operations View and Download MFJ -2289 Big Ear instruction manual online. Works perfectly a very good receive only antenna you will not be disappointed. MFJ-249 SWR Analyzer Instruction Manual This review covers all the basic 100 Watt MFJ tuners. I have this loop - it's the 40M-15M version with the tuning box. However, particular care must be taken to reduce system losses. 160, 80, 75, 60, or 40 Meter Full Wave Horizontal Loop Antenna or, Why I use an Electric Fence Antenna on 160 MetersProducts. 78 delaware Mfj pocket loop to tripod mod. MFJ-2289 Big Ear Antenna pdf manual download. The Yahoo Magnetic Loop Antenna group is a discussion forum for design and construction of magnetic loop antennas. Compare Products . Antenna pdf manual download. Sent the controller back, got refund and bought a large capacitor and a reduction gear with isolation mounts. Drape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. 95 In Stock : No Image Available: 8017862SM : MFJ 8017862SM: CONTROL BOX ONLY for MFJ Using our free SEO "Keyword Suggest" keyword analyzer you can run the keyword analysis "mfj tuners" in detail. 15" x 8. 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. 2 to 1 but really 10 to 1. - tuners Palstar - tuners SGC, Inc. Customer Review Price: Low to High Price: High to Low MFJ-4125 MightyLite 25 Amp Switching Power Supply in Excellent Condition! MFJ Antenna Tuners New - 600 and 1500 Watt REMOTE MFJ Autotuners now in Stock! Station Equipment MFJ Antenna Tuners ™ 200 Watt MightyMite IntelliTuner At just 6. Customer Review Price: Low to High Price: High to Low 6 to 1 Reduction Drive for Amplifiers & Tuners, Fits 1/4 inch shaft The MFJ-998 Full Legal Limit 1500 Watt Intellituner takes you to the final level in automatic antenna tuners. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. MFJ-935B, in that tuning is much “trickier”, and there is no internal metering. This was my first experience of a magnetic loop and I was very impressed. Get some flexible copper tubing, like used to connect water to refrigerator ice-makers. The product we developed is enclosed in a sturdy aluminum case, and features Dan Tayloe's (N7VE) led swr indicator, with all stainless steel connection hardware. MFJ-935 Loop Tuner Product Reviews - eHam www. I received the MFJ-939 yesterday without incident. antenna. As far as an interface, the simple solution is a Singalink. 40m through 10m Antenna. Ham Radio - 80 160 meter magnetic loop transmitting antenna. It is also true that one does not read the reviews on eHam without seeing the comments about an alleged lack of quality control at MFJ. MFJ IS NOW THE ONLY AUTHORIZED NORTH AMERICAN SALES AND SERVICE DISTRIBUTOR FOR XIEGU PRODUCTS! MFJ is the exclusive North American Distributor of this new ultra-portable multimode HF transceiver. 5 inch Cross-Needle SWR/Wattmeter that shows SWR, forward and reflected power all at a glance. A magnetic loop antenna is electrically simple and looks like a two turn transformer with a tuning capacitor in the larger loop. $49. Shop with confidence. 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. 3 to 30 MHz with a full 150 Watts. Here, you'll find links for MFJ antenna tuner covering hf-vhf-uhf. Antenna Tuners & Switches Alpha Delta - switches LDG Electronics - auto-tuners MFJ Enterprises, Inc. Total failure. A I wrote the following explanation about why not to assume that an antenna tuner is necessary, or even useful for good reception. You can also add a new product or service in the Antenna Tuners/Matching Networks category. 25", the MightyMite complements today’s compact HF transceivers like the IC-706MKIIG, IC-7000, FT- 857D, DX-70TH and TS-50S. 5-30mhz, 150w, w/current/swr watt Drape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. About Hamshop. Find great deals on eBay for mfj tuner. For decades, the Johnson Matchbox has been the standard of comparison for balanced line tuners. It has a built-in RF antenna current ammeter for tuning. Only at eHam. The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. MFJ-935B Loop Tuner: Review and Modifications. . 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. The MFJ-971 is a compact 200-Watt portable tuner MFJ QRP transceivers. Improving/Modifying MFJ tuners. 8-30 MHZ. Ideal for the amateur operator who is space TRRS #0833 - MFJ-2980 Vertical Antenna PT 1 Richard at MFJ was kind enough to send me this MFJ-2980 Vertical antenna for review. These are normally constructed as a single turn of heavy-gauge wire (AWG #10 or larger), copper pipe or tubing and are tuned to one specific frequency at a time using a series variable capacitor. In very good condition, artificial ground is very good for getting rid of rf 'hot spots' due to ineffective ground. 5 to HF Antennas Especially stealth models for those in an HOA Remote Tuners Many antennas work best with one of these, MFJ Loops MFJ1780 14-30 MHz Loop The only thing I can think of, is the meter on the MFJ tuner is so terribly inacurate that serious damage was done. The MFJ loop tuners are specialty tuners for tuning low loss transmitting loops that are under a quarter wave in circumference. Loop Tuner, 5. A dipole is also in use for 6 meters with future plans to build a 6 meter square loop. FREE Shipping on eligible orders. This includes dipoles, inverted-Vs, random wires, verticals, mobile whips, beams, and others fed by coax lines or single wire from 160 through 10 Meters. I suspect, not having opened one up or looked at a schematic, that the MFJ loop tuners work similarly to a Army Loop, which has the advantage of not needing a variable capacitor at the top of the loop like many other designs. For over forty years, I have been an avid Field Day (FD) participant with clubs both small and large, from coast to coast. en bevestig beide uiteinden aan deze MFJ 935B tuner en u hebt een kleine, zeer efficiënte multi-band magnetische loopantenne, bruikbaar voor zowel ontvangst als zenden. 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. . MFJ-23, $89. Intelligent Ultra-Fast Tuning MFJ’s InstantRecall first checks its memory to see if you have operated this frequency before. installed in MFJ-347 mount. Description: The MFJ-935 is a specialised Loop Antenna ATU for portable/home station use. MFJ-998RT is a remote automatic antenna tuner powered by IntelliTuner™ to handle full legal limit power CW/SSB or antenna tuning units! “Remote Antenna Tuners” is the topic of the just-released episode of the “ ARRL The Doctor is In ” podcast. MFJ-1778M G5RV JR. loop’s high “Q”, but at the expense of reducing the effective tuning capacitance by a 1/2. For these tuners, the expectation is that you mount the frame for the loop directly on the top of the tuner. MFJ Items Sort by: Sort by Featured Items Newest Items Bestselling Alphabetical: A to Z Alphabetical: Z to A Avg. uk 01922 414796, for all your Wonder Wand antenna radio needs. mfj The company began operations in a small rented hotel room in the old Stark Hotel in downtown Starkville, Mississippi. Magnetic loop antennas have a bidirectional pattern that is fairly sharp. The flagship of the Kessler Engineering LLC product line is the AT-AUTO, Automatic Antenna Tuner. I used it to test the water but have now built a high power tuner so dont need it 150. This is because the output from the internal RF source falls slowly with frequency, so you want the Tuner to use the lowest value while calibrating for the worst-case match condition. This is a new in the box MFJ 949E. The SK who had it took it to the park and used it to operate his QRP rig for portable use. The MFJ-201 has an FT-243 socket for crystal testing. GigaParts. The MFJ tuner with the motor drive attached. (right). During these experiences I observed that top performing FD stations have one thing in common – superior antennas – typically large wire antennas and/or beams. 5-30 Mhz and a magnetic loop from 04) MFJ-269B HF-VHF-UHF Antenna Analyzer MFJ- Manual Antenna Tuners. 5 - 30 MHz 150 Watts for Ham Radio Email to friends Share on Facebook - opens in a new window or tab Share on Twitter - opens in a new window or tab Share on Pinterest - opens in a new window or tab The MFJ-998RT Full Legal Limit 1500 Watt IntelliTunerTM takes you to the final level in automatic antenna tuners. Please consider this a newbie question. centurylink. By Phil Salas AD5X. Click here to read Phil Salas review of the MFJ-936B, MFJ-935B, and MFJ-933. The “primary” of this transformer is a small loop of wire, fed by standard 50 Ohm coaxial cable (coax) that goes to your HF transceiver. With a capability of 1500 watts SSB and CW, coupled with automatic tuning, your high-power station can now operate essentially hands-free even when frequency and band changes are made. There are three models of loop tuners available: The MFJ-933B, MFJ-935B, and MFJ936B. MFJ-19, $69. AC6V's HOMEBREW ANTENNAS LINKS INCLUDING ANTENNA THEORY . com - The full service computer and amateur radio store. 3 to 30 MHz with a full 150 watts. 1. ca 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. ANTETUNE - MFJ 936B loop tuner I have a pretty nice MFJ 936B loop tuner. It’s a clone of a clone of a clone of the sark100 antenna analyzer. Farson VA7OJ/AB4OJ 1. The tuning algorithm will figure out which way to turn the motor, based on the SWR readings, regardless of the value of this setting, or how the motor is wired. Johnson Matchbox Jr. A friend just gave me a MFJ-937 loop antenna tuner. 8 - 30 MHz Ham Radio Antenna Tuner . That is why I build a tuner for it, directly at the antenna. i. A MUST WATCH video for the amateur radio enthusiast. 3 to 29. Review Mfj 1886 Active Loop. AWG dipole or 132', 14 AWG loop) by clipping HV mica transmitting caps in parallel with each of the two variables, and also a HV • An antenna tuner (coupler is a more correct term) is an impedance matching device which minimizes Types of Tuners • Auto, semi-auto, manual adjust, or fixed. ca A Magnetic Loop Antenna is basically just a resonant circuit using an oversized inductor and an adjustable capacitor. They're designed to match virtually any transmitter to almost any antenna. Manual and headed outside to try to dip my 75 meter loop. If the inductor has a circumference of much less than, say, 1/10 th of a wavelength, then the efficiency of the antenna will suffer. MFJ 971 - MANUAL ANTENNA TUNER - 200 WATT - 1. Grunberg -- Kensington, Maryland U. accessories, magnetic loop, manual antenna tuners, automatic antenna tuner and more are here for future reference. The component which can restrict a wide operating bandwidth is the choke balun. Am an SWL, not a HAM, and am considering an MFJ loop as the primary indoor SWL antenna, along with an active antenna as a less potent secondary, the two connected via an LOOP TUNER 3 5 30MHZ 150W W CURRENT METER AMATEUR-RADIO - ANTENNA TUNERS - - MFJ MFJ-935B Discount Price Houston TX. 330 to 29. A SWR dip occurs at that frequency. MFJ-929, MFJ-939Y, MFJ-991B, MFJ-993B and MFJ-998 auto antenna tuners can be operated directly by the TUNE button on FT-857/D and FT-897/D transceivers when connected For those folks who have constraints that do not allow you to put up a big HF antenna then take a look at the MFJ-1796 6-band antenna. It turns virtually any wire loop into a high efficiency transmitting loop antenna. net is a Web site dedicated to ham radio (amateur radio). 5”, the MFJ-932 QRP Loop Tuner is the perfect size for portable operation. mfjenterprises. Mfj 8621 Manual MFJ Enterprises product available range at radioworld. Waters & Stanton are suppliers of amateur and professional radio equipment, GPS, marine, aeronautical and short range handhelds as well as Europe's largest ham radio demonstration center. Only US funds accepted. There are details on constructing a The MFJ-998RT Full Legal Limit 1500 Watt IntelliTunerTM takes you to the final level in automatic antenna tuners. Using the MFJ-935b we made one from a bicycle rim for 10/12 MFJ 935B Small High-Efficiency Loop Tuners™ Drape a wire around a bookcase and attach both ends to an MFJ 935B small high-efficiency Loop Tuner™ a Not Yet Reviewed 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. Pre-owned · MFJ. The idea of constructing loops for receiving radio signals is almost as old as the industry itself. Why Antenna Tuners Aren't Necessarily Useful for Shortwave Listening by Daniel A. new, never used switch from mfj, just do not have original box. Palstar tuners, speakers, and accessories are for amateur radio operators who demand the highest quality of contemporary engineering designed for Ham Radio. MFJ-902 Tuner 150 Watt Antenna Tuner Covering 1. 4 to 25. the problem I had. C New! QRPocket TM Loop Ant MFJ-9232, $59. It provides a convenient cross-needle type SWR/Wattmeter and features a special user-selectable 6-Watt range for QRP operation. product manual, instruction manual, reviews, free download files, related products, and much more. These tuners were seldom built in enclosures, because near-constant access to the taps and the inductor(s) was a necessity for changing frequency. Place the 13-ft loop around the PVC Cross Mount and get ready for multi-band coverage. These are manual tuners designed to tune small loop antennas, and are particularly useful for antenna restricted and/or portable operation. I have owned two of the MFJ loops. 95 2 in Stock : No Image Available: 7581120 : MFJ 7581120: TELESCOPIC ANTENNA for MFJ-1022/852 $3. Welcome to the MFJ antenna tuner page. Selling 6 month old MFJ-993B low power, 150/300, watt auto tuner toward the high power version of this auto tuner. 8. For Sale Magnetic Loop AntennaThis magnetic loop antenna is typically used for amateur ham radio purposes. A small transmitting loop, small tuned loop or magnetic antenna is defined as a loop antenna of less than one-tenth to one-quarter of a wavelength in circumference. MFJ Loop Tuner Design Discussion All MFJ loop tuners use a butterfly loop-tuning capacitor, which has no rotating contacts in series with the high-current RF loop signal. LOOP TUNER W/CURRENT METER 3. MFJ Small, high efficiency Loop Tuners™. MFJ-9232 QRP Loop Antenna Mini Tuners are small, versatile, high-efficiency These highly-portable mini tuners create a Hi-Q tuned-circuit that functions. Helically Loaded Magnetic Loop Antenna Tower information TowerTalk Mailing List Archives Guyed Tower Topic Summary. The difference is in size and features. 5-30 MHz with Current Meter & SWR/Wattmeter. eham. Compatible Tuners MFJ-991 MFJ-991B MFJ-993 MFJ-993B MFJ-994. I have heard the the bandwidth is just a few khz on 40 meters. In addition, specific models mentioned in the MFJ antenna tuner Like QRP antenna tuners,cross meter antenna tuner, high power tuner,and more are here for future reference. Other feed arrangements were tried. I purchased the large loop tuner from MFJ. If you are running a K through a 1k rated MFJ tuner and the circuit changes somehow (jumper or feedline failure, balun failure) then the rf goes right into the tuner. I am considering buying the MFJ-1788 Magnetic loop antenna that covers 40m-15m. I'm looking at getting one of the different MFJ loop tuners (932, 9232, 933, 935, 936) and experimenting with it--its not really an issue of which, since they are all posing me the same problem: I can't find the minimum/maximum capacitor specs of any of the MFJ loop tuners. Mfj 902 Tuner Manual MFJ-902H tiny Travel Tuner w/ Balun MFJ-902H Download Manual Tiny 4½ x 2¼ x 3 inch tuner handles full 150 Watts! Covers$112. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied. The characteristic of the tuning capacitor will not allow it. A toroidal ferrite core transformer for example with 8 turns on the primary and the loop passing through the core once acting as the secondary. MFJ-451 Morse Keyboard Instruction Manual The MFJ-451 Morse Keyboard sends Morse code from a keyboard. The MFJ-939 comes complete with interface cable and programmed for your particular radio. Hamshop is the webshop for the avid radio amateur. Built in sound card, uses VOX to key the radio, when the audio starts, it keys the rig, no com port required. Practically everything we offer in the webshop is in stock, including high-end equipment and over 1200 connectors. sorry no post face to face and cash in hand only. MFJ 7302310: BLACK TRAY BATTERY HOLDER PLASTIC MFJ-259 $3. Likewise, a loop on a rotor is a great asset, because you can point the nulls anywhere you want, but turning a loop is almost guaranteed to change its tuning charactaristics unless it is high and completely in the clear. More info: MFJ-9232 QRP LOOP TUNER product reviews by real people like you. Resources listed under Antenna Tuner category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. Peak or average forward and reflected power and SWR can be read on the illuminated cross-needle meter. co. uk 01922 414796, for all your radio needs. Tap or hover to zoom . MFJ-939 200 watt Plug & Play Auto Tuner MFJ-922 VHF UHF Compact Antenna Tuner, 922, Manual, Antenna tuners, by MFJ, The MFJ-922 compact dual band VHF UHF antenna tuner has a single meter that reads SWR and power -- No zero adjustment needed It covers VHF from 136 to 175 MHz and UHF from 420 MFJ-922 VHF UHF Compact Antenna Tuner, 922, Manual, Antenna tuners, by MFJ, The MFJ-922 compact dual band VHF UHF antenna tuner has a single meter that reads SWR and power -- No zero adjustment needed It covers VHF from 136 to 175 MHz and UHF from 420 The MFJ – 58B PVC Cross Loop Antenna Kit was designed to be used with the MFJ- 933, MFJ-935B and MFJ-936B series of Small High Efficiency Loop Tuners to provide coverage from 5. In The MFJ-986 uses a true current balun to force equal currents in the two antenna halves -- even if the antenna is not perfectly balanced! The MFJ TrueCurrentBalun gives superior balance over voltage baluns and minimizes unbalanced current. I am using MFJ hamsticks for 20m and 40m bands in dipole configuration(s), i. Here is the first post in this blog on MFJ-2220 and MFJ-2240 dipoes on 38ft/10+m Max-Gain fiberglass pole I use. My oblong loop antenna works surprisingly well on the higher shortwave bands, and it also works well on receiving the lower bands, and the SWR there is to high to tune it with a tuner at the transceiver. These days many Hams are seeking ways to improve their reception and up their signal strength, and are resorting to wire antennas from the past fed with ladder-line, used in conjunction with tuners and/or baluns to accomplish matching to 50-Ohm coaxial line. 5mm vane spacing and the matching capacitor is an air MFJ-1780 Box Fan Loop Antenna Instruction Manual loop as a wheel, the nulls are in the same directions that the wheel's axle would run. com or www. It is designed for portability, and can be …Using just a few mw of output power, this circuit is used to find the 50 ohm resonance frequency of antennas or can be used to adjust an Antenna Tuning Unit for 50 ohm match, without generating QRM I own an Yaesu FT-817 that I wanted to use on 6 meters but none of my antenna tuners could match myWHY USE SYMMETRICAL MATCHBOXES ? Symmetrical matchboxes offer the optimum means of matching a symmetrical antenna when fed with openwire feedline. Antenna Tuners A tuner does NOT tune the antenna Tuner transforms the complex impedance seen at the input of the coax feeder, to 50 ohms resistive, to meet transmitter requirement facilitates maximum power transfer to antenna Most modern rigs have built-in antenna tuners typically will match < 3:1 down to 1:1 at rig interface The tuners at MFJ are grossly overrated at power output. I have found that half of the given level in the manual is very safe. MFJ doesn't seem to sell the tuner I've got anymore, but this setup can be used on any tuner that has either an inductor switch where the spring detent system can be defeated or a roller inductor. Recently I purchased a Mini 60 antenna analyzer. When the MFJ is sending a signal at the frequency where the test cable is a 1/4 wave, the cable looks like a short at that frequency and the 50 ohm connection is completed to ground. 3-30 MHZ, 150 Watts With Current Meter . Having owned the MFJ 269 for a number of years, I’m under No Illusion about the Mini 60. The antenna is at a height of 10 meters. Homebrewing antenna tuners is a curation of 100 resources about , N4EKV. The radio also comes with a banana plus to connect a longwire antenna and a DC power cord. I would call this a review, but I’m not going to try and convince you whether you should buy this or not, I’ll just share my experience and you decide for yourself. 144-220440 MHz MFJ-862 Download the MFJ-862 Manual This new MFJ Cross Needle. The inductor switch is the most likely component to burn up in any antenna tuner. Market for recommended makesmodels, I bought the MFJ-201 Dip Meter new. It gives you superb current balance throughout its very wide matching and frequency range. The MFJ-998 Full Legal Limit 1500 Watt Intellituner takes you to the final level in automatic antenna tuners. I use the MFJ-993B Intellituner, an automatic memory tuner, which features a balanced output and is rated at 300 watts. Get one of the MFJ mag loop tuners. MFJ ANTENNA-TALK #8 "Hang & Play" Classic Zepp Antenna. The MFJ-1918 collapses to a compact size for easy storage. I'm pleased to report the 993B handles the loop beautifully. This one tunes continuously from 6. I have not had good luck with this very expensive ($450) antenna. Cut the loop to specified length, mounted it to the controller/tuner box. It instantly turns into a small, high efficiency multi-band transmitting loop antenna! Loop No. Get instant bandswitching, no tuning, no warm-up, no tubes to baby and no fuss! The reliability of the ALS-1300 is insured by using eight rugged MRF-150 power FETs. The MFJ-933 Small High Efficiency Loop Tuner, Jr. Find great deals on eBay for Antenna Tuner in Radio Antenna Tuners. - eHam. The feed loop is RG58 soldered according to the picture shown. I've had and have MFJ metered tuners but never experienced anything like that. The plug is screwed into the MFJ and the test cable is screwed onto the socket. Product marketing started in October of 1972, and the first product was a high selectivity filter that would enable a receiver to separate one Morse code signal from scores of other signals that were being transmitted over The listing you're looking for has ended. MFJ's exclusive InstantRecallTM, IntelliTuneTM and AdaptiveSearchTM algorithms give you fast automatic tuning with more than 2500 non-volatile VirtualAntennaTM memories. MFJ MFJ-935B Loop Antenna Tuner 3. The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. MFJ has control/interface leads which allow certain models of MFJ auto antenna tuners to be operated directly from the TUNE button on certain Yaesu SSB transceiver models. CAUTION: Due to the high voltages and strong radiation field this antenna may produce, take care to avoid close proximity to this antenna while transmitting significant power levels. You have no items to compare. The UK leading Supplier and Distributor of Communications Equipment. It was a common practice to build these tuners on a breadboard for maximum accessibility. ask. You have no items in your shopping cart. 95 Special Order : No Image Available: 7302342 : MFJ 7302342: WHITE BATTERY HOLDER PLASTIC MFJ-259 $3. net. MFJ-935B magnetische loop tuner Wikkel een draad rond een boekenkast o. Always popular with MW DXers, HF loops have gradually been gaining acceptance. 936B Loop Tuner. View the manual for MFJ935B View the manufactures page for MFJ935B View the eham review page for MFJ935B Drape a wire around a bookcase and attach both ends to this new MFJ-935B Small High Efficiency Loop Tuner! MFJ says that a 7 foot wire or copper tube will make a loop to go with their series of loop tuners that will cover 20m, 17m and 15, and it does, but, if you want to maximize your signal on 20m the way to go is to use a 13 ft. It instantly turns into a small, high efficiency multi-band Introduction MFJ manual loop tuners are versatile, high-efficiency loop tuners that can turn any loop conductor into a high-efficiency multi-band transmitting loop QRP LOOP TUNER, 10-40M, 25WATTS . MFJ Loop Tuner Design Discussion All MFJ loop tuners use a butterfly looptuning capacitor, which has no rotating contacts in series with the high-current RF loop signal. Online Retailer for Ham Radio Equipment. Low MFJ-904, Same as MFJ-902 Tiny Travel Tuner but has a large 1. It is designed for 50-ohm use at QRP- MFJ-1782 . Buy Teac TR-670 AM/FM Stereo Tuner with Remote (Discontinued by Manufacturer): Tuners - Amazon. 95 Brand: MFJ, model : 1886. Remote tuning for Magnetic Loop (ALEXLOOP) antenna by android app via bluetooth. The MFJ-932 QRP Loop Tuner basic information With dimensions of just 3”x4”x1. The loop tuning capacitor is a TX type with a 1. B. 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. MFJ-948 Versa Tuner II 1 MFJ-948 Versa Tuner II Instruction Manual General Information The MFJ-948 is a 300 watt RF output power antenna tuner that will match any transmitter or transceiver to virtually any antenna. The MFJ-939 Plug&Play Intellituner™ a simple to install and convenient antenna tuner for use with Icom, Alinco, Kenwood, or Yaesu radios. mfj loop tunersDrape a wire around a bookcase or window and attach both ends to this new MFJ Small Loop Tuner™. 700 MHz (60-10 meters) by using only four loop lengths. You can operate 5. HORIZONTAL LOOP ANTENNA CONSTRUCTION . 10Dx3Wx3½H inches. i am only selling this item as i am downsizing to a smaller house and cannot take it with me. The MFJ-451 has two 100 character message memories and a 200 character type ahead buffer. 2. Everything else is included. For the 150-watt tuners, MFJ manufactures their own butterfly air-variable tuning capacitors (MFJ-19 and MFJ-21). Since it has a power handing capability of 50 watts, you can easily The review goes for a MFJ-933 ( the simplest of the loop tuners) Hams , beware of this product!!! Sorry to start like this, but I must inform that my tuning capacitor produced strange noises on my transceiver. More Radio Amateur MFJ Antenna Tuners MFJ-903 (MFJ 903 MFJ903) antenna tuner :specifications manuals The main loop material is RG213 Coaxial Cable, around 1 metre in diameter. MFJ Small, high efficiency Loop Tuners™ Click here to read Phil Salas review of the MFJ-936B, MFJ-935B, and MFJ-933. I believe MFJ are the only commercial manufacturers of these but they are VERY expensive! The main problem with mag loops is that they are very high Q and need to be re tuned even for a relatively small change in frequency so a motorised tuning capacitor arrangement is most definately required. 00 shipped to your door Listing #1411595 - Submitted on 11/19/18 by Callsign W7GS, Modified on 11/21/18 - IP: 75-170-10-253. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. MFJ antenna tuner •Shielded coupling loop (RG-8X) for noise immunity. But, it had a severely limited matching range and covered only 80 MFJ’s Loop Tuner Tutorial MFJ has made available on their web site a tutorial entitled “MJF Manual Loop Tuner Considerations. Here is a link. Kessler Engineering - Amateur radio products manufacturer, automated antenna tuners, shack automation products, and associated accessories. tuners. 95 The magnetic loop is small, reasonably efficient even close to the ground, has a low take off angle and it has a deep null on each side which lets you null out interference. The MFJ-1788 control head contains a cross needle SWR/Watt meter that reads forward and reflected power on high (300 Watt) and low (30 Watt) power scales. mfj loop tuners + MFJ MFJ-935B Loop Antenna Tuner 3. Tiny QRPocket Loop Antenna makes portable operation truely portable and fun! No ground needed!Jan 30, 2016 This thing is INCREDIBLE!! Make a loop, out of wire, any shape, small size, and have a very efficient antenna. MFJ 949E - ANTENNA TUNER - 300 WATT - HF - 1. also has a detachable mount for a PVC Cross. Introduction and Purpose. For the 150-watt tuners, MFJ manufactures their own butterfly airvariable tuning capacitors (MFJ-19 and MFJ-21). $75. 5 - 250 MHz Dip Meter MFJ-201. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. No ground, radials or counterpoises needed. Products 1 - 10 of 20. com FREE DELIVERY possible on eligible purchasesBuy Second Hand Yaesu FC-30 Antenna Tuner Unit Matching for FT-897/D from Radioworld. com/youtube?q=mfj+loop+tuners&v=E56wIlpfZgA Mar 12, 2016 Hf loop antennas made out of something that almost EVERYONE has at their home. MFJ-935B Loop Tuner, 5. d. This item is currently out of stock. 8~30 MHz Automatic Antenna Tuner 300 Watts SSB / 150 Watts CW IntelliTuner w/SWR/Watt Meter. The MFJ-974B is a fully balanced true balanced line antenna tuner. E. A. The couple MFJ tuners I've used lacked anything above 10m. A long-perimeter horizontal loop antenna normally is used as a multi-band device, otherwise a completely different one- or two-band antenna would be erected. MFJ-1786/1788 Magnetic Hi-Q Loop Antenna, please note collection only - cash on collection no paypal this is relisted due to time wasters, not reading the above. 275 Watt (Switch Failure) MFJ-212 Matchmaker; Ten Tec 1051 Noise Bridge; Ten Tec 1225 Wattmeter Kit; Dipole / Inverted V / Horizontal Loop Antenna Calculator MFJ Apartment Antenna 40 Meters to 2 Meters MFJ-1622 MFJ Super Loop Antennas MFJ ScrewDriver Antennas Quicksilver Radio Products MinuteMan™ HF Portable Antennas Stealth Antennas -- HF Mobile Antennas By VE7BOC Texas BugCatcher - GLA Antennas Texas Twister - GLA Antennas Ventennas-- The Forbes Group Ventanna HFP-2 10 Foot HF Antenna-- 6. mfj-969, deluxe versa tuner ii, high frequency plus 6 meters, 300 watt, with roller inductor The MFJ-971 is a compact 200-Watt portable tuner MFJ QRP transceivers. 4335 Steeles Ave. Meter reading 1. I would like to share my experience thus far with the MFJ-9232 QRP Loop Tuner. The actual loop tuner circuitry is identical in the three tuners. - auto-tuners MFJ MFJ-57B MFJ 57B PVC CROSS LOOP KIT, 20-15M, FOR MFJ-933/935B/936B The MFJ-57B PVC Cross Loop Antenna Kit includes a PVC Cross Mount that plugs into the cover of the Loop Tuner and a 13-ft insulated 10-gauge flexible loop wire with low resistance lugs. Wonder Wand Widebander MKii Version from Radioworld. Drape a wire around a bookcase and attach both ends to this new MFJ935B Small High Efficiency Loop Tuner! It instantly turns into a small, high efficiency multi-band transmitting loop antenna! You can operate 5. The MFJ-1918 is perfect for camping trips, expeditions, hiking, etc. Specialising in new & used Ham (Amateur) Radio, Commercial Two-Way Radio, Marine & Aviation equipment. 8MHz - 28MHz MFJ’s new VirtualAntenna Memory system gives you 2500 memories, has a coaxial antenna connector and a binding post for end-fed long wire antennas. This is a little long for 80, 17 and 12 meters, but a little short for 40 and 30 meters and just right for 20, 15 and 10 meters. Description: Small High Efficiency Loop Tuner. For 2 meters and 440 j-poles are in use at about 20' above the ground. It is great for mounting loop antennas, VHF/UHF vertical antennas, or any other type of portable antenna. (you can download the whole manual from the MFJ website) Looks like you have to stick with those sizes or the unit won't match to 50 ohms well. De resultaten die ik behaal met deze antenne zijn geweldig, ondanks dat hij niet optimaal is gemonteerd, hij zit op een mast langs de gevel en de dakgoot, ook zit het metalen frame van de dakkapel er vlak bij. Using the MFJ-1788 Mag Loop Antenna Horizontally (#135) - Duration: MFJ-998 automatic antenna tuner Ham Radio Basics--Jim W6LG Tests Antenna Tuners, Which One is the Most Efficient Drape a wire around a bookcase and attach both ends to this new MFJ-936B Deluxe Small High Efficiency Loop Tuner. It instantly turns into a small, high efficiency multi-band transmitting loop antenna! RF Exposure in Loop Tuning. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. 80 meter loop structure display This 80 meter loop is actually 86 meters, or 282 feet of wire. C3 provides the matching of the loop’s low impedance to the transceiver’s 50Ω. I tried this at field day and was  AMAZING homemade HF loop antennas MFJ-935b loop tuner www. Combining two TV antennas for better HDTV reception. > Antenna Tuners > MFJ 150W Small High-Efficiency Loop Tuner™, 3. Antenna Tuners A tuner does NOT tune the antenna Tuner transforms the complex impedance seen at the input of the coax feeder, to 50 ohms resistive, to meet transmitter requirement facilitates maximum power transfer to antenna Most modern rigs have built-in antenna tuners typically will match < 3:1 down to 1:1 at rig interface The MFJ one that goes down to 40m is pretty inefficient on 40m. The article evaluates several automatic antenna tuners including the MFJ-927 from MFJ Enterprises Inc. Drake MN-7 1. 45 DOWNLOAD MANUAL · MFJ Catalog Plug & I also have a dipole cut for 40 meters using an MFJ 941 tuner. , CG Antenna CG-3000, and SGC SG-230. Drape a wire around a bookcase and attach both ends to this new MFJ-933 Small High Efficiency Loop Tuner, Jr. MFJ-901B Antenna Tuners are MFJ's smallest and most affordable 200-Watt PEP Versa Tuner. e. Tel: 0845 2300 599. 9 post • Page:1 of 1. Notes: For best results perform the BAD_MATCH calibration while the loop is tuned near its upper frequency limit. While wandering around the MFJ area at Dayton 2005, I saw several new products that. The MFJ-4117 switch provides an additional switch to interrupt the power supply. My Loop Antenna November 20, 2013 14 Receive Properties of Electrically-Small Loops Save mfj antenna tuners to get email alerts and updates on your eBay Feed. I am concerned about the very small bandwidth of this antenna. 5 kW dummy load has a built-in true peak reading SWR/Wattmeter that you can switch and use independently! The MFJ-998 Full Legal Limit 1500 Watt Intellituner takes you to the final level in automatic antenna tuners. net MFJ-969 Antenna Tuner Failure. This is a new in the box MFJ 971. Other automatic tuners suggest outboard baluns and a length of coax to the tuner. 5 - 30 MHz 150 Watts for Ham Radio. MFJ 900 Econo Tuner; Heathkit SA2060A; Dentron 160-10AT; Dentron MT2000A; A Homebrew LCL Antenna Tuner; A Homebrew kW Antenna Tuner; E. loop of wire wrapped around the transmitting antenna can also be connected from the BNC jack ground to center conductor to pickup a signal. The AutoCap firmware, described below, can be configured or extended to just about any motor control circuit. 73, Greg ke4ooo . At that bandwidth you can't even touch the knob on the rig without tuning the antenna. rcmt. com. MFJ-904H MFJ 6 Meter/VHF/UHF Antenna Tuners MFJ 6 Meter Antenna Tuners MFJ-906 $ 95 906, $89. Then purchased a long 1 inch roll of copper tubing to make the loop. "thing"After doing some "playing" with the location of my 1788 mag loop on the balcony and getting really nowhere with lowe There are some commercially made "tuners" that are designed to be used near the antenna feedpoint and may be worth investigating if you are so moved. Listen…and learn! 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. Signals will be attenuated more than 10 dB if they arrive within 15 degrees of the axis of the loop. The unit came with the MFJ-5114Y interface cable to use with my Yaesu FT-450D radio. 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. The antenna also displays directivity characteristics similar to that of a dipole when mounted vertically. Mfj-969 - manual tuner with roller inductor (1. The MFJ-998RT Full Legal Limit 1500 Watt IntelliTunerTM takes you to the final level in automatic antenna tuners. Ameritron’s eight FETs are mounted on the dual heavy duty heat sink. ML&S Martin Lynch & Sons, Chertsey Surrey UK. 5 kW Dry Dummy Load has built-in precision, true peak-reading SWR/Wattmeter switchable to external antenna! Worlds most versatile 1. 6Dx3Wx3½H inches. Note The following antenna projects were gathered from the internet, therefore the author …LAMCO Barnsley 01226 361700 Ham Radio Shop Amateur Radio Dealer Supplier Marine Radio Aviation Air Band Transceivers Two Way Radio CB RadioTechnical resource and information on receiving and transmitting antennas, amplifiers, radios, baluns, for 160 meters 80 meters and other low bandsThis multiband vertical designs provide 9 band coverage encompassing the 6, 10, 12, 15, 17, 20, 30, 40 and 80 meter bands. S. A bigger loop, or a copper loop, would work better. Since 1972 MFJ manufactures QRP radios, antennas, manual and automatic antenna tuners, antenna switches, antenna analyzers, Morse Code keyers and accessories, and various other products for HF/VHF and UHF frequencies. I have found with this antenna there is no way to tune it below 15m. Its high Q makes tuning a challenge. The design does not change from model to model except for additions of antenna switches, baluns, and SWR meters. ” In it, their various loop tuner products are discussed in detail along with basic loop antenna theory, design, and general operat-ing practices. If we make the loop much longer or shorter, we would end up with the antenna being unsuitable for some of the bands. net/reviews/detail/4953MFJ-935 Loop Tuner product reviews by real people like you. The MFJ-1918 extends up to 6 feet and will hold a maximum of 66 lbs. Automatic Antenna Tuners & Couplers by Adam M. The heart of the MFJ Loop Tuners is an extremely low loss butterfly tuning capacitor with no rotating contacts. Six Meter Ship code A tuner. Usually a pair of these Bias-Ts is used, one in the shack to source the DC power, one at the remote end (DC sink). Condition: 935B Loop Tuner. 5-30MHz 150W. 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. The MFJ-974HB is a fully balanced true balanced line antenna tuner. 18 to 136 pF