Mfj 1979 Loading Coil

2 inches diameter by 6 inches length. 8 through 50 MHz, and offers maximum sensitivity in the 10 to 20 MHz range. With the MFJ-269 meter my motto is build, test, cut, test. No loading coils are used on these bands. The GS3 loading coil is a real work of art. Shop from the world's largest selection and best deals for MFJ Ham & Amateur Radio Antennas. The higher the loading coil the better. Mercury Outboard Bad Pencil Coil Symptoms. End Loading On 30, 40, 75/80 Meters, end loading -- the most efficient form of loading -- gives you highly efficient performance, excellent bandwidth, low angle radiation and automatic bandswitching. This work is all donated. By continuing to use our site, your are agreeing to. My Plate Tank Coil Details: Both of my coils for the 6AG7 amplifier are wound on National XR-5 five prong coil forms. More than a simple "flagpole", this complete antenna system includes adjustable base-loading coil, Guanella balun, and counterpoise. Only MFJ has exclusive, isolated dipole elements that let you insert balun or coil up coax to isolate feedline. Modifying an MFJ-259b Antenna Analyzer to Operate on 630 Meter. For dipoles, use two whips with the MFJ-347 dipole mount. I could make this resonate on. Phone orders, Technical Support, Service Dept. This is what you have been waiting for! A high power mobile hamstick that handles 600 Watts! MFJ-1675T, the longest of the 600W hamsticks has a 53 inch long base and the whip with the ferrule is 40 inches, giving you almost 8 feet of a real mobile antenna. Sigma-40XK, KG4JJH Page 1 of 19 and loading coils are placed in series with the balun. The antenna uses efficient end loading coils with capacitance hats for operation on the 40 and 80 meter bands. The position of the alligator clip sets the resonance fixed coarse tuning is done by moving in and out of the telescope (or the unit's built-in antenna tuner). Each side of the dipole is broken up by a coil that presents a high impedance at. For optimum operation of the MFJ-962B, tune the exciter into a 50 ohm load. For dipoles, use two whips with the MFJ-347 dipole mount. 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. Remingtonh has installed a good ground radial system to improve the efficiency and performance of the vertical. In december 1999 I improved my 136kHz antenna by placing a part of the loading coil at the top of the vertical part. Hookup leads are supplied approximately half the length of the coil. The antenna is a modified MFJ-1979 1/4 wave 20 meter vertical coupled to a RadioWavz Patriot 80 adjustable loading coil, supported by a Hustler mast, and tuned in part by a MFJ-959 capacitive matcher. This antenna was appealing to me because I live on a small city lot, where my entire backyard is completely taken up with a swimming pool. My last vertical antenna experience relevant to the Hex Array came from the MFJ-1792 antenna. Cut bottom 5″ of bottle off. The 80M coils use 1. The MFJ coils work fine, but the build quality is garbage and they will fall apart on you. Technical resource and information on receiving and transmitting antennas, amplifiers, radios, baluns, for 160 meters 80 meters and other low bands. MFJ "I-IF Stick" mini-Dipole Mount Build your own 80-6 Meter mini-dipole using two I-IF mobile whips! Mounts on mast up to 11/4" 01). These MFJ monobanders are available for 6 Meters and each HF band. This article describes a specific procedure to adjust a shunt matching coil to assure that the input SWR will remain relatively low (≤ 1. Wave operation on 20 Meters without loading coil and 30 / 40 / 60 / 80 / 160 Meters with loading. They can also be used to replace your current automatic screwdriver whip for a more highly efficient fixed mobile operation. 40 m Loading coil 20 m ¼ W with top hat Capacity Loading (top hat) A ¼ wavelength trans-mission line X velocity factor is a resonant circuit which creates a phase shift at which the open end decouples that frequency from the main element 10 m ¼ W VERTICALS ¼ W Decoupling Stub Multiband A A B B C A C ½ W ½ W VHF/UHF Collinear (J-Pole Match. 95 - Telescopes for full 1/4 Wave operation on 20 Meters without loading coil and 30/40/60/80/160 Meters with loading coil. This is what you have been waiting for! A high power mobile hamstick that handles 600 Watts! MFJ-1675T, the longest of the 600W hamsticks has a 53 inch long base and the whip with the ferrule is 40 inches, giving you almost 8 feet of a real mobile antenna. The coil is mounted with #8 stainless steel screws, washers, lock. 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. Align with MOOG to restore like-new steering and handling. Product information. The coil wire itself was some 18 gauge hook up wire that turned out to be too large for my protoboard, so I am glad it found a good home in the matching coil. MFJ-1979 Antenna, telescopic, 20m. Coil-Shortened Vertical Antenna Calculator. The left picture shows the coil next to an MFJ antenna analyzer. 40 m Loading coil 20 m ¼ W with top hat Capacity Loading (top hat) A ¼ wavelength trans-mission line X velocity factor is a resonant circuit which creates a phase shift at which the open end decouples that frequency from the main element 10 m ¼ W VERTICALS ¼ W Decoupling Stub Multiband A A B B C A C A different connection is possible -that. 5:1 on 80m, and a bit better on 40m. 95 1 in Stock : MFJ67 : MFJ MFJ67: 40m BIG STICK LOADING COIL, 3/8 x 24thd $65. It can handle up to 25 watts. Attached to the bottom turn of the coil is a. My primary interest was a lightweight portable vertical antenna for 40m, as for 20m - 10m I use my C-Poles. When combined with the MFJ Ground-Coupled™ Portable Antenna Base or other suitable grounding system, such as radial system, the result is a small vertical. Add to Cart - Telescopes for full ¼ Wave operation on 20 Meters without loading coil and 30 / 40 / 60 / 80 / 160 Meters with loading. Quick review and test of the MFJ 1979 telescopic whip vertical also part of the MFJ 2286. MFJ’s premium stainless steel telescopic whips are the perfect choice for building collapsible multi-band dipoles, mobiles, portable and base antennas. By tapping the coils with the fly leads, and moving the hoseclips up and down , to stretch, or compress the coils , I eventually got resonance on 80m and 40m. Looking up 160M mobile coils on the Internet most people talked about big diameter coils about 8" long. Discussion in 'Antennas, (MFJ-1979), which extend up to 16 feet. But greater loading (higher Q) also allows physically shorter antennas for a given frequency. Recently I've been making my own coils and so I wanted to pass on my methods. The antenna can be easily mounted onto a. Find many great new & used options and get the best deals for Mfj-1979 Antenna Telescopic 20m at the best online prices at eBay! Free shipping for many products!. (Courtesy: MFJ Enter-prises) MFJ-1622 Apartment Antenna covers 40 through 2 meters has smaller telescoping whip, no tuner and retails for $99. MFJ's unique Frequency Adaptive L-NetworkTM provides automatic impedance match-. The reduction in size is accomplished by adding separate loading coils and capacitance hats at each end of the antenna for the HF bands. I use a mag-mount on top on my mini-van with the MFJ-1979 fully extended. MFJ solved these problems by combining efficient end loading with a balanced center feedpoint design. Use electrical tape to fasten the closely wound loading coil so it won’t come loose. it is negligible. CASH PAYMENT: "Cash" discount price may be earned by making payment by personal or bank check or money order in advance (personal checkorders will be held 10 days for clearance of check), by making remittance by wire transfer to our bank (a $10 per thousand charge is added for this method). Each side of the dipole is broken up by a coil that presents a high impedance at 20 meters and acts as a loading coil on 40 meters, allowing the antenna to resonate on 40 meters even though it is physically. MFJ-1979 MFJ MFJ1979 [MFJ1979] $64. Can get hot! on some freqs. Use these inexpensive, lightweight, isolated mini-dipoles when space is limited for temporary or permanent installations. This can have a big impact on ANY vertical not just a S-IR The length, number and quantity in ground , on ground and elevated will all have an impact on the resonance charactersitics as well as the feed point impedance. Saves $10! QuikStik ™ antenna system with MFJ-1979 17 foot telescopic whip antenna. The loading coil assembly is hung from a metal bracket 4| resting on the upper edge of the steel reinforcing inner casing 33 at its extremities. MFJ-2910 160 and 80 Meter Matching Networks are remote relay-switched tuning coil assemblies designed specifically for any 43 ft. YO4HHP's blog. Attach the MFJ -1954 telescoping whips by screwing them into the end of each coil assembly as shown in Figure 6. MFJ-1660T HF Ham Stick 60 Meter 3/8-24 With Whip Mobile Antenna. The MFJ-63 loading coil is really a High Q coil, and that's why this antenna woks relatively well on the low bands. Page 7 MFJ-1625 Instruction Manual Window/Balcony Mount Antenna Schematic Page 8 MFJ-1625 Instruction Manual Window/Balcony Mount Antenna Tuning Chart You may wish to remove or make a copy of this page and place it near the tuner. (a) Using just the 102" whip I obtain resonance on 1. Build an effective dipole antenna that needs much less space by adding two loading coils. So, first I built & tested the dipole with loading coils by itself, see this page. Comments: 1. 27inches collapsed. 8 mm inner diam). End fed HF wire antenna Published on April 9, 2016 April 29, 2016 by pa1ejo For a HF antenna you can make a half wavelength dipole, but the problem is that it is only resonant at the wavelength you design it for unless you insert some loading coils. This article describes a specific procedure to adjust a shunt matching coil to assure that the input SWR will remain relatively low (≤ 1. Now, when RF is applied to the antenna, the currents "ignore" all but the one pair of loading. With the MFJ-269 meter my motto is build, test, cut, test. ) After that we couldn't wait to get the K1 hooked up and start operating. MFJ-1964K Ultimate Portable HF Vertical Antenna Kit. It far outperforms other HF compact antennas. 632' 'diameter bottom sections. Includes One MFJ-347 & 2 MFJ-1640T Ham Stick Antennas. The coil windings are inside the sturdy fiberglass tube, which Gary molds around the loading coil. " Includes One MFJ-347 & 2 MFJ-1620T Ham Stick Antennas. Wave operation on 20 Meters without loading coil and 30 / 40 / 60 / 80 / 160 Meters with loading. Much taller than the average Ham mobile antenna, this tree branch snapper tops out at 17 feet, 10 inches above the road. HAL TERPENTING Sebelum melakukan pengukuran menggunakan MFJ269 1. Search the history of over 384 billion web pages on the Internet. Hallelujah! Those on the list may recall some problems I was having with my MFJ-969 tuner, particularly the roller inductor, well I fixed it!!. The supplied 4 ½ foot whip can be used for mobile or limited space operation. MFJ’s unique Frequency Adaptive L-NetworkTM provides automatic impedance match-. These types are common in the rubber ducky types of antennas on hand held walkie. It can handle up to 25 watts. Requires MFJ-7703, BNC to BNC elbow connector. West, Toronto Ontario M3N1V7 Tel: 416-667-1000 [email protected] Add To Cart. With a couple of the top telescoping sections out of the scenario you would find it easier to affix a cap hat on the remaining thicker sections. MOOG is the preferred brand of professional technicians and NASCAR crew chiefs. Insulated 14 gage house wire was used. The result is a physically small vertical antenna that gives good performance and does not require any type of RF ground system. Hi-Q HF Mobile Antennas Military / Government / NVIS /Commercial customers: Click Here If you are already convinced that you want a Hi-Q-Antenna, then you can get right to the Pricing and Ordering page by clicking on the antenna you wish at the bottom of this page. Hi-Q air-wound loading coil only for 40-2 Meters, as used on MFJ-1654. The MFJ-969 has a new tough aluminum case has a scratch proof multi-colored lexan front panel. Only MFJ has exclusive, isolated dipole elements that let you insert balun or coil up coax to isolate feedline. 6-80 meters using a supplied whip 10 feet in length. Therefore, as you move the coil toward the end, there is a balancing of competing efficiencies. The efficient end loading coils are wound on fiberglass forms. Only one third of the coil is used. But performance is down about 8-12db on a dipole on 80m. Strong recommendation: MFJ 18xx-series single-band whips for KX3, etc. An interesting characteristic can be observed by increasing the length of antenna below the loading coil on a LF mobile antenna. After some final tweaking to adjust the number of turns to achieve best SWR as measured by the MFJ-259, we arrived at 14 turns for the 40M coils. 2" Stubby Antenna The short stubby 2" antenna uses a coil to match TX to a 50 ohm load, not radiate. The base of each whip features a standard ⅜ - 24 mounting stud for installation on mobile or fixed antenna mounts like MFJ's lip mounts, magnet mounts, tripods and dipole mounts. The Super Antenna MP-1, Buddistick, PAC-12, Hamsticks, Hustler, Wolf River, MFJ whips, Wilson 5000, Chameleon Antennas MilWhip and the Outback all are examples of what I own or have used. So, first I built & tested the dipole with loading coils by itself, see this page. With no ground losses, your efficiency is now. They are NOT intended to be used in motion and will be easily damaged when attempted to be used in motion. Much taller than the average Ham mobile antenna, this tree branch snapper tops out at 17 feet, 10 inches above the road. 2" Stubby Antenna The short stubby 2" antenna uses a coil to match TX to a 50 ohm load, not radiate. The loading is made from coperweld wire. 5 times, but your coil losses double (twice the inductance). Wire wound, 7 watt, 50 K ohm equalizing resistors safely protect each filter capacitor -- not 2 watt, 100 K ohm carbon composition resistors that can open and cause your filter capacitors to explode or fail. So I only have room for a. Technical resource and information on receiving and transmitting antennas, amplifiers, radios, baluns, for 160 meters 80 meters and other low bands. circuit of 68 uH and 120 pF. An interesting characteristic can be observed by increasing the length of antenna below the loading coil on a LF mobile antenna. The MFJ-1775 is inconspicuous and low profile -- not much bigger than a TV antenna and can easily be turned by a. MFJ-1979 16. The position of the alligator clip sets the resonance fixed coarse tuning is done by moving in and out of the telescope (or the unit's built-in antenna tuner). MFJ-1979 MFJ MFJ1979 [MFJ1979] $64. MFJ-2286 Big Stick™ Portable HF Antenna Introduction: Congratulations on the purchase of your MFJ-2286 portable HF antenna. 3- Screw the fiberglass loading coil and stainless steel whip assembly into one of the 3/8 X 24 connections on the MFJ-347. Covers all bands 80 Meters through 6 Meters including WARC Bands. The two taps on the coil will need to be soldered, and. The telescopic antenna and the MFJ-67 loading coils are ⅜ " - 24 threaded and can be easily combined. I used band switching in my amplifier because I only had two coil forms and I wanted to avoid having to switch coils so often. MFJ-67: Open loading coil for 40m Open loading coil for MFJ-telescope antennas and other antennas with 3/8 "connector. ) FOLLOW THE GUIDELINES FOR ANTENNA INSTALLATION AS RECOMMENDED BY THE US CONSUMER PRODUCT SAFETY COMMISSION. All mechanisms and coils are inside the assembly, resulting in a smooth, simple appearance. Are you satisfied with how your classic Corvette feels in a tight corner? Does it seem kind of loose and drifty? This Shark Bite Coilover Kit will make your ride substantially more responsive, offering a smooth ride with great handli. My plan would be to use a ground mount like the MFJ-1901, leave it and the radials in place, and only mount the antenna when I plan to use it. Mon - Fri:. Together these give a 99% efficiency. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. By continuing to use our site, your are agreeing to. In order to maximize the efficiency, the loading coil is large, and, to the best extent possible, metal parts are avoided in close proximity to the coil. The MFJ-66 Dip Meter Adapter is a kit consisting of 2 coupling coils and a UHF to RCA female adapter. MFJ-1668 Instruction Manual Screwdriver Antenna Mobile Setup 1. Sale ends 10/26/2019 at 11:59PM EST. This is the most time consuming step. In loading coils, turn spacing is the biggest efficiency factor. This MFJ Walkabout antenna is designed for the FT-817 and other QRP rigs. The MFJ-63 loading coil is really a High Q coil, and that's why this antenna woks relatively well on the low bands. Above the parts. MFJ’s unique Frequency Adaptive L-NetworkTM provides automatic impedance match-. Cookies help us to give you a better experience on this website. 5 times, but your coil losses double (twice the inductance). Does anyone know which would work better and be more efficient - a base adjustable loading coil or use an external antenna tuner?. But performance is down about 8-12db on a dipole on 80m. I put it on my MFJ-259b meter and it had 55 uH at 2 MHz. Using an MFJ-259B antenna analyzer, we found we were able to tune the antenna all the way from 80m to 10m, with low SWR and close to 50 ohms on all major bands (after careful adjustment of both top whip length and coil tapping below 20m. it is negligible. HamCity has more than 30 years of experience in the amateur radio equipment business! Please visit us today for all your ham radio needs!. The most common questions are: What does the coil do? A loading coil does not replace a missing fraction of a wavelength. It would take a 8 ft antenna with a small coil to do the same. I have used heat shrink at the bottom of my MFJ-1979 to prevent anyone from touching the antenna which is easy to apply. This is the most time consuming step. MFJ’s premium stainless steel telescopic whips are the perfect choice for building collapsible multi-band dipoles, mobiles, portable and base antennas. MFJ's premium stainless steel telescopic whips are the perfect choice for building collapsible multi-band dipoles, mobiles, portable and base antennas. Secure the coil assembly to each dipole element with a #8 × 3⁄4 inch sheet metal screw. Includes One MFJ-347 & 2 MFJ-1675T Ham Stick Antennas. The whip unscrews from the 12 inch base loading coil. A 630-meter transmit down-converter utilizing transistor mixing plus a 10-watt Class D power amplifier for little $$$ Implementing an effective ATU for 630. 3/8" port up and down, power 100 watts. (The loading coil cancels the huge capacitive reactance of a short radiator) If an antenna tuner was used, it would be replacing both the loading coil and shunt coil. The monopole with QRO loading coil comes with a radial kit. Open loading coil for MFJ-telescope antennas and other antennas with 3/8 "connector. The MFJ-1668 becomes a very efficient portable antenna when used in combination with a tripod and a ground radial system. When you're looking for a full size mobile HF antenna with no compromise, consider one of these MFJ 1979 Telescopic Whips. Tune the exciter up into a dummy load. The Ameritron AL-811 power supply is built tough so you get peak performance year after year. Its no Wimp! Its directivity reduces QRM/noise and lets you focus your signal in the direction that you want -- so you can work some real DX. Recently I've been making my own coils and so I wanted to pass on my methods. Product information. Hi all, I've been using an MFJ-1820T telescoping 20-meter whip for a few months. MFJ antenna tuner •Shielded coupling loop (RG-8X) for noise immunity. You can also use two of these with the MFJ-347 to make a mini dipole. The MFJ-63 loading coil is really a High Q coil, and that's why this antenna woks relatively well on the low bands. The screw heads will be sheared off if too much torque is applied. I found a way to combine hamsticks, telescopic antennas and loading coils. The efficient end loading coils are wound on fiberglass forms. Use these inexpensive, lightweight, isolated mini-dipoles when space is limited for temporary or permanent installations. The antenna uses efficient end loading coils with capacitance hats for operation on the 40 and 80 meter bands. 6mm diameter enameled copper wire and prefer to use 2. The 40 meter elements were trimmed for resonance at 7. Above the parts. This feature is not available right now. The further out on the leg the coil goes, you gain a higher radiation resistance (good), but requires a larger coil and higher resistive loss (bad). 5" length of MFJ 4004-0008 coil stock. The telescopic antenna and the MFJ-67 loading coils are ⅜ " - 24 threaded and can be easily combined. The table below contains technical information for our Airdux™ line of air wound coils with polycarbonate ribs. My initial version used only 1 in. Above the parts. Much taller than the average Ham mobile antenna, this tree branch snapper tops out at 17 feet, 10 inches above the road. End Loading On 30, 40, 75/80 Meters, end loading -- the most efficient form of loading -- gives you highly efficient performance, excellent bandwidth, low angle radiation and automatic bandswitching. A bolt 43 passes centrally through the loading coil construction placing a tension on the assembly of loading coils through the bracket 41, a nut 4 44 and lock washers 45. Add to Cart - Telescopes for full ¼ Wave operation on 20 Meters without loading coil and 30 / 40 / 60 / 80 / 160 Meters with loading. I was intrigued by the article and scanned a copy of it to put in my files for future reference. The antenna itself is 3. The Watson 80Plus2 designed by G3OJV and sold by Waters and Stanton is a compact antenna measuring 52 feet in length that is designed to cover the 80, 40 and 20 metre bands. MFJ-2286 Big Stick HF Antenna. The result is a physically small vertical antenna that gives good performance and does not require any type of RF ground system. and with a 5-10 foot mast underneath your coil you would be able to use a shorter top (MFJ-1979). turn spacing, and the loss was noticeable. When you're looking for a full size mobile HF antenna with no compromise, consider one of these MFJ 1979 Telescopic Whips. MFJ's unique Frequency Adaptive L-NetworkTM provides automatic impedance match-. Secure the coil assembly to each dipole element with a #8 × 3⁄4 inch sheet metal screw. Strong recommendation: MFJ 18xx-series single-band whips for KX3, etc. The antenna is resonate on both bands and does not require an antenna tuner. 5dB was expected (due to better current distribution) but measurents by PA0SE and DK8KW showed an increase of about 4dB. 12mm wire wound onto an AA battery. I remember making one coil that was 16" long, and consisted of 1/2" soft copper water line wound around a 20" form. Standing alone, the antenna is good for 10-20m by adjusting the length. The coil was mounted on nylon screws and coils were made rigid with epoxy. Only at eHam. telescopic whip are intended to be used stationary, for portable operations. MFJ-1979 Antenna, telescopic, 20m. My plan would be to use a ground mount like the MFJ-1901, leave it and the radials in place, and only mount the antenna when I plan to use it. MFJ-1936TW, $89. 6 Band Trap Vertical 75-6m Instruction Sheet The CP6A is a multi-band trap-vertical antenna for HF bands, covering the 75*, 40, 20, 15, 10m & 6m amateur bands. An extensive comparison of 31 different antennas was performed by Mike W9MDB. Today we will feature one product of interest. MFJ-2299 kit instead of individual parts. Wound at 3. YO4HHP's blog. They require a 5 pin coil socket. It has a loading coil which has a huge loss, maybe 5 ohms, and a shunt matching coil. I used a 2. 836 with a coil setting of 30 (MFJ-1924 controller) which is nearly maximum inductance. In loading coils, turn spacing is the biggest efficiency factor. Loading Coils; Mobile Antennas; Other Antenna Types; Receiving Antennas; UHF CB Antennas; Antenna Analyzer; Antenna Tuners. The reason is, a 160 meter loading coil is about 5 times larger (in inductance) than an 80 meter loading coil. HamCity has more than 30 years of experience in the amateur radio equipment business! Please visit us today for all your ham radio needs!. Find many great new & used options and get the best deals for Mfj-1979 Antenna Telescopic 20m at the best online prices at eBay! Free shipping for many products!. In an effort to maximize portability and reduce both setup time and the footprint of my antenna system I bought 80 and 40 meter versions of MFJ’s hamstick dipoles (MFJ-2240, MFJ-2275). This online calculator tells you how the amout of inductance your loading coil will need to have. The T2X Tailtwister Series II Rotator is for large medium antenna arrays up to 20 square foot wind load. MFJ-1668 Instruction Manual Screwdriver Antenna Mobile Setup 1. This 40 and 80 meter inverted V antenna is made with loading coils. Cut bottom 5″ of bottle off. net is a Web site dedicated to ham radio (amateur radio). Its no Wimp! Its directivity reduces QRM/noise and lets you focus your signal in the direction that you want so you can work some real DX. End fed HF wire antenna Published on April 9, 2016 April 29, 2016 by pa1ejo For a HF antenna you can make a half wavelength dipole, but the problem is that it is only resonant at the wavelength you design it for unless you insert some loading coils. MFJ-2299 kit instead of individual parts. A teen in Kuala Lumpur makes friends over the airwaves with a ham in United States. Only at eHam. If the sum of the three sections equals a free-space quarter-wavelength, then the number of coil turns will be zero and a simple quarter-wave vertical results. Comments: 1. 95 - Telescopes for full 1/4 Wave operation on 20 Meters without loading coil and 30/40/60/80/160 Meters with loading coil. Hi all, I've been using an MFJ-1820T telescoping 20-meter whip for a few months. •MFJ-926B. In stock fast delivery call now. An interesting characteristic can be observed by increasing the length of antenna below the loading coil on a LF mobile antenna. The two taps on the coil will need to be soldered, and. Includes One MFJ-347 & 2 MFJ-1640T Ham Stick Antennas. Loading Coil Vertical Antenna MFJ 1954. MFJ-1662 mobile HF screwdriver, 1662, Mobile antennas, by MFJ, MFJs new Manually Tuned Screwdriver Antenna let you operate all bands 40-6 Meters continuously including all WARC bands. Its ten section telescoping whip is 52 inches fully extended and is 7 inches when collapsed. How do you make a short dipole? The answer is, put two loading coils at a distance B from the dipole feed point at its center. MFJ's premium stainless steel MFJ 1979 telescopic whips are 16. They can also be used to replace your current automatic screwdriver whip for a more highly efficient fixed mobile operation. I was intrigued by the article and scanned a copy of it to put in my files for future reference. MFJ-1899T, (see left) features 80 through 6 Meter coverage with a “wander-lead” tapped loading coil and collapsible 52-inch whip. It is ultra-compact for easy traveling. The antenna is resonate on both bands and does not require an antenna tuner. Saves $10! QuikStik ™ antenna system with MFJ-1979 17 foot telescopic whip antenna. Today we will feature one product of interest. The MFJ-1668 becomes a very efficient portable antenna when used in combination with a tripod and a ground radial system. You can probably get loading coils from MFJ but it is really more fun to make them yourself. MFJ-1936TW, $89. Each side of the dipole is broken up by a coil that presents a high impedance at. Coil-Shortened Dipole Antenna Calculator. 6 on the 6m band, fully extended the MFJ. This is the Take it Along (TIA) portable antenna which helped the National Parks on the Air (NPOTA) winner snag many, many QSOs. The test results can be found HERE. (use COAX BYPASS) Follow these steps for proper tunin: 1. The aerial currently in use is a telescopic quarter wave vertical antenna (MFJ-1979) which is fitted at a height of 20 meters above the ground. In december 1999 I improved my 136kHz antenna by placing a part of the loading coil at the top of the vertical part. The MFJ-1775 is inconspicuous and low profile -- not much bigger than a TV antenna and can easily be turned by a lightweight TV rotator (see AR-35, page 63). This is the Take it Along (TIA) portable antenna which helped the National Parks on the Air (NPOTA) winner snag many, many QSOs. Center load is best but with the weight of my design I chose base load. In the real world with finite ground losses, center loading generally doubles your antenna efficiency. More than a simple "flagpole", this complete antenna system includes adjustable base-loading coil, Guanella balun, and counterpoise. Being lazy I never calculate anything. 0 out of 5 stars 1. The Dover to Cap Grisnez telephone cable was the first cable between England and the Continent to use loading coils. When you're looking for a full size mobile HF antenna with no compromise, consider one of these MFJ 1979 Telescopic Whips. On 80 meters, the antenna is a very efficient top loaded antenna. Insert your own values for each frequency according to your station. Unsolder the loading coil from the connector fastened to the whip (whip connector). of each loading coil housing onto the end of each 21⁄2 foot dipole element. The key to making this homebrew vertical antenna is using a decent radial system and loss loss coaxial cable feed line. HF Small and stealth antenna suppliers is a curation of 24 resources about , HamRadioFun. Super heavy-duty solid aluminum construction. They are great for traveling, mini DXpeditions, vacations, etc. 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. It is also easier to build, and easier to find parts for. The Ameritron AL-811 power supply is built tough so you get peak performance year after year. In order to maximize the efficiency, the loading coil is large, and, to the best extent possible, metal parts are avoided in close proximity to the coil. What others are saying Quicksilver Radio carries only the best in Ham Radio Accessories We carry a wide selection of Amateur Radio accessories. Much taller than the average Ham mobile antenna, this tree branch snapper tops out at 17 feet, 10 inches above the road. The whip unscrews from the 12 inch base loading coil. Includes One MFJ-347 & 2 MFJ-1617T Ham Stick Antennas. A 1979 on an adjustable Coil (Superantenna, Buddistick) without a tuner. The radiator collapses to 60 cm for easy storage or carrying. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. the coil form. In this video, the antenna consists of a MFJ-1979 (1/4 wave 20-meter telescoping mast) a RadioWavz "Patriot 80: adjustable loading coil, a Hustler mast, and a MFJ-909 capacitive meter. 95 Out of Stock : MFJ70 : MFJ MFJ70: REMOTE CONTROL for MFJ-495 $32. HF Small and stealth antenna suppliers is a curation of 24 resources about , HamRadioFun. Carefully screw the desired whip into the 3/8 coupling nut located on top of the loading coil.