Two models cover the 75-/80- and 160-meter bands. Since you are operating primarily local 80 meter operation, any height above ground up to about 20 feet will result in NVIS, pretty good. array and those in my 80-meter and 160-meter 4-Squares are guyed. However, these latter two extensions of the folding process do not immediately appear very attractive. I'm not trying to discourage experiments, but rather steer the experiment in a useful direction! 73 Tom. Quarter wave 80 meter vertical antenna, W4NFR In the summer of 2010, I decided to construct a 1/4 wave 80 meter vertical using 3" OD Aluminum Tubing. 80m Inverted-L Antenna (Base-loaded for 160m) Click here to jump to latest news on this antenna My coaxial-dipole would just about tune up on 160m but its replacement, a standard 40m half-wave dipole wouldn't. efficient operation 10 through 80 or 160 meters. The 43-foot Vertical Antenna Advantages -Still can be self-supporting & moderately unobtrusive -Approximately 3x higher radiation resistance than the typical trap or loaded vertical. The base insulator below is for a 43ft vertical that was mounted over a good ground system and fed with a good loading coil on 80-meters. Better for the performance at the 40 and 80 meter band is a 7 meters long antenna and at most 15 meter of coax. for 80 and 40 meters. Coil-Shortened Dipole Antenna Calculator. 95 DESCRIPTION The MFJ-17758 is a two band, 80- and 40-Meter center-fed dipole antenna capable of handling 1500 watts. Just before the November Sweepstakes contest, I put up a secondary 80-meter antenna—the open-wire fed dipole I used at K8GU/9. The ground loss for your radial system will be approximately 89% of applied power. Bar Code/EAN:. VERT 80 15M BASE LOADED is a vertical antenna with a loading coil at the base for the band of 80 meters (3. Today we will feature one product of interest. An 80 meter trap will have some net inductive reactance, so depending upon the L/C ratio in the trap, the end section of the antenna will probably need to be shorter or possibly considerably shorter than it would need to be without a trap. Impedansi antena yang disarankan adalah 50 ohm. The resource is currently listed in dxzone. I'm not trying to discourage experiments, but rather steer the experiment in a useful direction! 73 Tom. - connect the bottom of the coil either to your antenna analyser, or your transmitter via your SWR meter, so you can check it for resonance (or best SWR) at 3. hi-q, hi-radiation efficiency is provided by the computer design and the mil-spec materials used in its manufacturing. Low budget easy to build 20 meter Antenna. and either use full-sized 80 meter dipole, or load it with loading coils. 59 million miles on his Hi-Q-5/80 antenna bought nearly 20 years ago. Customer pays for shipping of replacement product. The 40M coil is shown in Figure 4 and the 80M coil is shown in Figure 5. So, it is easy to see that using a rectangle shaped bar with a small dimension facing a small dimension, there will be much less turn to turn capacitance from that of a large round coil stock. You can add loading coils to an 80 meter antenna to make it work after a fashion on 160. This 1 PC Qi Wireless Charger Receiver Charging Adapter Receptor is categorized under. Although this modification won't be as efficient as or capable of the same bandwidth of an 80 meter dipole, this antenna will get you on the air from a small size lot. The 75-/80-meter sections are full-size dipoles. The 80 meter or 3. A close-up of the antenna with all four coils installed is shown in Figure 6. Warning: chmod() has been disabled for security reasons in /var/www/vhosts/jay360. With this limited amount of info, is there a design guru out there who can suggest a simple design for a 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. Above the parts. The Pro-Am antennas are very slender and have a low visual impact, see photograph (left). 160- and 80-Meter Matching Network for your 43-foot Vertical - UPDATED Phil Salas - AD5X The popular 43-foot vertical is self supporting, not too obtrusive, and has higher radiation resistance than many popular trapped- or loaded verticals (increased radiation resistance minimizes efficiency-robbing ground losses). PETE N6HH with his 18 wheeler and 20 year old Hi-Q -5 mobile antenna with 2,590,000 miles on the antenna. An easily made 7 MHz coil mounted midway up the mast is used to cover the 40 meter amateur radio band. 3 However, this 80 m broadband performance is achieved in a slightly different manner. Basic Wire Antennas to coax by using loading coils 80 (3. With the sunspot plunge, a goodsignalonthelowbandwill beamust during the next few years. SKEMA OSCILATOR 80 MTR DENGAN VR (VARIABEL RESISTOR) OSCILATOR PEMANCAR 80 METER BAND DENGAN MENGGUNAKAN IC Sebelum. Sign in | Report Abuse | Print Page | Powered By Google Sites. Sep 29, 2010 · A Variable Base-Loading-Coil for use under a HF Mobile Whip 29 September 2010 I recently went away for a week's holiday with the camper trailer, taking along the IC-706MK2G (made famous on other pages on this web site) plus the LDG Z100 auto tuner and, to conserve space, just two Mobile One helical whips, one for 7 MHz , the other for 14 MHz. Again, to minimize skin effect loss, it is important to keep the 3 in. Being lazy I never calculate anything. 5 MHz band is a core amateur radio frequency band, allocated frequencies from 3. On 40m, the RF "sees" the lower coil as the high impedance path, and so goes via the capacitor to the upper coil, and on to the rest of the vertical. Low budget easy to build 20 meter Antenna. php on line 8. We have some of the finest quality 4 10 available anywhere! Buy 4 10 now. Adrian PA0RDA and I once bought a bunch of glass fibre masts with a length of 12. This makes the 2 Meter Slim Jim antenna a great solution for repeater sites, data and packet stations, APRS, and even every day. Relay; Sensors and Controls. Trap coils are waterproofed and condensers are epoxy-sealed. I found a 60 meter resonance for this 160 loop (third harmonic) and it did not work as well as a low dipole cut for 60 meters. You can add loading coils to an 80 meter antenna to make it work after a fashion on 160. If you are a talk-radio fan then experiment with the AM band antennas and you will be able to hear shows from all over the country with surprising clarity. Let's add a 20 meter quarter wave wire"; good on paper but bad idea. ANTÉNY PRO 160 m. Similar in size as the Hi-Q-4/80, that is: 4" diameter loading coil by 10 " long (8" usable coil). Dec 10, 2015 · The 20 meter quarter wave wire runs within an inch or two of the 80 meter loading coil. Johns, W3JIP Air-dielectric inductors can be made quite easily at home. Telescoping Whip Antenna Assembly Instructions The MFJ-1625 Window/Balcony Mount Antenna will be disassembled when you receive it. Preston, K5GP, described a dualband 160 & 80 m CL-OCFD exhibiting comparable broadband behaviour on 80 meter. It is a full sized 40m dipole, and the 80m loaded dipole is cut so that the center part is a 20m dipole. Issue is only on 80 meters: 80 meters will tune properly to its normal SWR, around 1. 10 MFJ-1785 Rotatable Dipole. That's why corona is a problem on 160 meter mobile antennas even at modest power. 0 MHz in IARU Region 2, and generally 3. They are different animals. If it resonates at too low of a. 5 inch stubs (using Anderson powerpoles) to the end of the antenna resulted in a resonant frequency of 3. Jul 04, 2018 · Have owned this SteppIr Big IR w/80M coil for four years without issue until now. 0 meters below it as first cut (see above). efficient operation 10 through 80 or 160 meters. The whip unscrews from the 12 inch base loading coil. That’s a tall order – literally! Shorter whips need to be tuned to resonance with coils, and these are lossy. 5 feet (including the coils). 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. You want an 80 meter trap. Frequency Meter. A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance. The antenna works on the bands as advertised with low SWR. Homebrew Your Own Inductors! Can't find the inductors you need for an antenna, a tuner or amplifier? Build your own—it's easy! By Robert H. I simply used the dimensions from the diagram, added my own style of making coils and antennas, and turned it into an inverted V antenna. The 40M coil is shown in Figure 4 and the 80M coil is shown in Figure 5. It is best to add the spokes on opposite sides of the coils. long wires) • Safety Rope • MFJ-1956 12 ft. Call sign: PH1J. Loading Coils for 160-Meter Antennas, Charles Michaels, W7XC, QST magazine, April, 1990. But a resonant 160 meter vertical is more than 120 feet high. resonate on 80 meters. 6 m) works quite well and still allows operation in the upper end of the 75 meter band. 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. This afternoon, I’ve been playing with an 8 meter fishing pole in the garden, clamped to a 3 meter aluminium pole with 2 x 10 meter elevated radials sloping from the feedpoint at 3 meters to fence height. We carry leading brands such as Diamond, Wilson, Firestik and more. 6 m) whip works best in most applications. Basic Wire Antennas to coax by using loading coils 80 (3. But with these changes and an improved ground system, you might get a full (6 dB) S-unit improvement. 9 MHz in Regions 1 and 3 respectively. 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. 12 results for 80 meter vertical antenna Save 80 meter vertical antenna to get e-mail alerts and updates on your eBay Feed. The plan for this antenna was to build a lightweight 80/40 meter antenna for field use (as part of my Go Kit) that wouldn’t overload my 21 foot telescoping fiberglass mast. 5 meters tall, with a 55 cm tall loading coil of 170 turns at the top of the bottom section of the pole. Built from stainless steel and aluminum hardware to resist corrosion, these rugged traps have a pull strength of over 600 lbs. I actually use his 80-40-20 fan dipole (3B2080LFAN), which is a clever setup. Once you are happy with the coil you may choose to crimp or solder the wires to lugs or leave as is. Center load is best but with the weight of my design I chose base load. Ph: (662) 323-9538 FAX: (662) 323-6551 LC-160Q 160 Meter Loading Coil Kit for 18 HT Hy-Tower INSTRUCTION MANUAL General Description The LC160Q was designed as an accessory item for the 18HT "Hy-Tower" antenna. The output meter should respond to audio frequencies and should provide readings at 50 mw and have a maximum range of 500 mw. Fed with open line it works great on all bands from 40 m and upward. and either use full-sized 80 meter dipole, or load it with loading coils. SteppIR uses relays and loading elements on Yagi's to select the direction of the antenna for 40 meters and up, and they also have a remotely switched loading coil for coverage of 80 and 60 meters with verticals. 5 MHz band is a band of radio frequencies allocated for amateur radio use, from 3. 7 to 1 across the entire 80 meter band. ARRL Contest and DXCC Rules Now Prohibit Automated Contacts. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m Steve Nichols G0KYA A shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1. With difficulty, it could tune 15 and 17 meters, and my LDG tuner could force it to work on 80 meters, but the amount of energy actually going out the antenna was pitifully small. quarter wavelength, a small loading coil is wound around the tubing at about 28 feet, to make the antenna resonant in the 80 meter band. 5 TPI to make tapping easier and to keep the losses down, 11 turns were sufficient. The length of the whip makes a difference on what bands you will be able to use with the antenna. So, an 80/160m trapped dipole will be an 80m dipole, with traps at the end of that, with additional wire to resonate it at 160m. We invite you to try it out. 10 MFJ-1785 Rotatable Dipole. resonate on 80 meters. HORIZONTAL LOOP ANTENNA CONSTRUCTION. By the way, some dipoles are designed to be used on more than one band of frequencies. There's a hidden factor at work here too. 5 x 16 cm Variable capacitors of 6000 V isolation Variable Coil more Reference MFJ989D. The best coil may have a Q of 330 or so, and many home-brew coils have Q’s much lower than. If you already have a coax cable assembly, use the RS-730 or RS-840 lip mount brackets. This type of trap construction of- fers several electrical advantages arid is. Many radio hams avoid playing on 160 meters thinking that antennas require heaps of spaceIn fact this is not soA 1/4 wavelength 160 meter vertical is around 130 feet tall and requires a minimum of 32 radials to make it work properlyOnly a few of us lucky to have the space and the means to afford erecting and maintaining such a structure. Once you've completed the 80 and 40 meter adjustments, move the antenna to the 20 meter band. the coil without unsoldering. 5 TPI to make tapping easier and to keep the losses down, 11 turns were sufficient. I used a 1 quart paint can that measure about 4 1/4 inch or so round, Close winding the 1/4 tubing around the paint can with 18 turns made up the 80 meter coil. On 40 meters it works like a normal 40 meter dipole. Why is the 10 Meter section not a continuation of the other sections topography ?. Industrylane is in partnership with manufacturers or biggest distributor assigned by the manufacturers to ensure 100% genuine and authentic products for customer. Wound in the same manner as the 75-meter coil, the 160-meter coil required only 60% of the number of turns as would be needed if the windings were in a single layer. ARRL Contest and DXCC Rules Now Prohibit Automated Contacts. Why is the 10 Meter section not a continuation of the other sections topography ?. The coils add loading to the 160-meter portion of those antennas so you will have a limited operating range on that band. The main category is Homemade projects for 80 meter Antennas that is about Antenna projects for 80 meters band. Center-loading (i. I have installed also the Capacitance Hat (CH) with 4 copper wires with the specified lenght +-3. The antenna is capable of I KW PEP on 80-meters. Jan 28, 2018 · An 80m Broadband Matching System. I used a 1 quart paint can that measure about 4 1/4 inch or so round, Close winding the 1/4 tubing around the paint can with 18 turns made up the 80 meter coil. Homebrew Your Own Inductors! Can’t find the inductors you need for an antenna, a tuner or amplifier? Build your own—it’s easy! By Robert H. Designed especially for. 10 Meter 117. The loading coil is wound onto a 1 inch fiberglass tube using #14 Teflon insulated wire for extended life. From 20 meters up, a whip as short as 63" (1. With this limited amount of info, is there a design guru out there who can suggest a simple design for a loading coil?. Includes all stainless steel hardware and til-over base. 2019-11-12 Several weeks ago I ordered the Wolf River Coils Silver Bullet Mini loading coil to replace the Silver Bullet 1000. (Rare, bit no one is perfect. They may look alike but they do not have the same electrical characteristics. Very Short 160-meter Inverted-V Larry Nelson - K5IJB. One version uses a drop wire at the end of the 40 meter band to trim without moving the coils or adjusting the 80 meter frequency. 0 MHz in IARU Region 2 (consisting mostly of North and South America), and generally 3. With the extra loading the antenna covers frequencies from under 3. A video of my Wolf River Coils Antenna that I operate with my old cb radios that I converted to operate on 20, 40, and 75 meter ham bands. Our more recent kit uses a metal chassis and an improved oscillator kit introduced in the 1960’s Handbooks. Hi-Q air-wound loading coil only for 20-2 Meters, as used on MFJ-1652. Mobile Mounting: The UHV-6 was designed to be lip mounted using the CP-5M or HD-5M (coax included). The main category is Homemade projects for 80 meter Antennas that is about Antenna projects for 80 meters band. Your CB/HAM radio is only as strong as its antenna. Since you are operating primarily local 80 meter operation, any height above ground up to about 20 feet will result in NVIS, pretty good. QRPGuys Portable 80/60m Vertical Antenna – $20 Your PayPal receipt is your confirmation that we have received your order. 5Pc 1/2" Dr. On the base wire of the antenna, about 89 feet away from the feed point, I have a tapped coil. 5 MHz band is a core amateur radio frequency band, allocated frequencies from 3. 0 meters below it as first cut (see above). 160m Top Band End Fed Antenna -G3YEU Coil Details:- 5" (127mm) diameter using 16 SWG bare copper wire. My experience of a 40 meter quarter wave gives me some confidence in this arena but I’m also wary of the different characteristics of 80 meters which maybe much more suited to higher dipoles. The loading coils and the end wires extend the operation of the half-size G5RV antenna to the 80m band. MFJ-1792 / 1793 has excellent efficiency and bandwidth on 40 and 20 meters. You can see my antenna in the March 1998 issue of QST. It gave me 40, 20 and 15 with a push because although a 40 meter dipole should give you a resonant 15 meter antenna, in this case - with the coils for 40 - it mucked the maths up and caused the ATU some trouble. typical of the stainless-steel whips sold for 11 or 10 Meter operation, a loading coil. <= Back to Dayton New Products Hy-Gain 80-6 Meter Patriot Vertical Antenna AV-680, $549. quarter wavelength, a small loading coil is wound around the tubing at about 28 feet, to make the antenna resonant in the 80 meter band. To 80m, the traps look like high impedances, effectively disconnecting the extra wire for 160m. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. The 80 meter or 3. Hall, “Off-center loaded dipole antennas”, QST Sept 1974, 28-34. Frequency Meter. Barker & Williamson has been a recognized leader worldwide in the manufacture of the highest quality HF broadband antennas, fiberglass masts, air wound coil stock, and other radio parts for military, government, EOC and commercial use since 1932. Call sign: PH1J. As was common with QST articles of yore, there is a plethora of equations, sketches, graphs, and tables provided for reference. With the addition of a base loading coil (LC-160Q) it also provides exceptional 160 Meters performance. Larger tubing is not required. 01 wavelength on 10 is about 4 inches. 9 MHz in Regions 1 and 3 respectively. between coils, and the height-to-width ratios are all important factors. Describe your experience with the MFJ-1792 80/40 top-loaded vertical and tell us why you give it the rating you did (required). The loading coil is constructed from 1/4 inch copper tubing, and supported by a structure made from PVC plumbing parts. In addition, all antennas are shipped with 20 feet of antenna control cable, control box with two #31 type material split beads for the antenna coax and control cable decoupling, a cigarette lighter adaptor with fuse holder, and a shunt coil for antenna impedance matching. 5 uH inductor as a loading coil for the 80 M / 75 M band, and is switched over to a 9:1 UNUN for all other bands from 60 M on up to 6 M. It also uses a large. 80 Meter Antennas Antenna Projects From The YCCC -- Double-L For 80/160, Two Wire Beverage, A Poor Man's 160 Meter 4-Square, Using a 4 square Vertical Phased Array to improve your 80 and 160 meter signal, -- From The Yankee Clipper Contest Club Verkürzte Antennen -- Short Dipoles and Verticals for 160m & 80m -- From DJ9RB. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m Steve Nichols G0KYA A shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1. The classic is back with improved design including three separate air dielectric Hy-Q traps for 10 through 40 Meters -- 1. Introducing the squid pole Fancy a cheap, collapsible self-contained portable antenna for 80, 40, 30, 20 and 15m that works really well and can be erected in minutes? This article describes an antenna built with a 9 Metre pole but with a little experimenting you can use the other length poles that are available. 8mhz) is about 38. I added a loading coil at 13' to get it resonant on 80. 5 meters to do experiments with vertical antennas. It is currently a work in progress. 30 Meter 105. Coil Calculator The coil calculator tool on this page is designed to help you quickly and easily determine common coil sizes based on your specific requirements. With a 102 inch whip, the Silver bullet will tune from 17 meters to near the bottom of the 80 meter band. com “W3DZZ loading coil re-tuning” 「ローディングコイルのテューニング」 I started making a W3DZZ multi band dipole and up-loaded my article on Oct. It shall be easy to adjust (i. Once the coil is inserted in the antenna line it should make it easier to operate 160m from the EMDRC Cluboom. You will have great band coverage on the 75-meter SSB or 80-meter CW portion of that band. Tuning 80 is by removing or adding turns to the coil and/or adjusting the length of the 80 meter section. Left to right. New Loading Coil for the 160 Meter Band The newest product in the catalog is a 160 Meter accessory for the Eliminator Antenna and other screwdriver type antennas. The stock 5BTV 80 Meter top loading coil is nearly identical to their mobile antenna top loading antenna. Sign in | Report Abuse | Print Page | Powered By Google Sites. Telescoping Whip Antenna Assembly Instructions The MFJ-1625 Window/Balcony Mount Antenna will be disassembled when you receive it. My plan was to have a two-element 80-meter beam that was tunable across the complete band. 5 μH coil I picked up in a flea market, which I bought since it looked to be about the right value, and the length-to-diameter ratio is consistent with a low ESR (equivalent series. A video of my Wolf River Coils Antenna that I operate with my old cb radios that I converted to operate on 20, 40, and 75 meter ham bands. The Short Dipole For Multi-Band Use. and either use full-sized 80 meter dipole, or load it with loading coils. 2019-11-12 Several weeks ago I ordered the Wolf River Coils Silver Bullet Mini loading coil to replace the Silver Bullet 1000. I'm thinking of adding a base loading coil between the balun and the monopole. A few pages on in the handbook shows feedpoint impedance of the typical loaded whip of the era at 16-22 Ohms on 80 Meters depending upon location of the loading coil, so I think it's safe to say that this transmitter would want something in that neighborhood to match. As a satisfied userof oneafthe original HF5V Butternut 5 band verticals I hoped that the HV2V. There's a hidden factor at work here too. 7 ohms on 80 meters and a distributed capacitance of 5. Theory of Operation The loading. HamCity has more than 30 years of experience in the amateur radio equipment business! Please visit us today for all your ham radio needs!. (Does not include coax cable). Home-made antennas can greatly improve the performance of AM and FM radios, short-wave receivers, and scanners. 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. 5:1 or less and adds negligible wind loading to the antenna. If it resonates at too low of a. 80 Meter COUNTRIES: 87. Similar in size as the Hi-Q-4/80, that is: 4" diameter loading coil by 10 " long (8" usable coil). After looking at my 80/40 meter vertical I thought, "Hey, I like to operate on 20 also. , at the feedpoint) requires the smallest amount of inductance. BY KD8OUT, Mike Kieffer. The portion of the band used for phone (voice) communications is sometimes referred to as 75 meters. WARNING: When installing your antenna, take extreme care to avoid any accidental contact with power lines or overhead obstructions. The antenna is capable of I KW PEP on 80-meters. Both the 80/40 meter wire and the 20 meter wire are connected in parallel at the bottom. Although this modification won't be as efficient as or capable of the same bandwidth of an 80 meter dipole, this antenna will get you on the air from a small size lot. I use a Balun Designs QRP balun on mine. As a satisfied userof oneafthe original HF5V Butternut 5 band verticals I hoped that the HV2V. If the unblock fails you will need to contact the server owner or hosting provider for further information. Rauch draws the following conclusions: On 80-meters, and actually over a fairly wide frequency range, time delay is about 3nS. So, I decided that for this winter, the vertical would become a dedicated 80m antenna. The antenna is 30ft X 4 in irrigation tubing with 4 drop wires and 4-20 ft top loading wires with only 8 ground radials 35 to 45 ft long. > I am assuming you do have the 6 metal spikes/top hat in place > because you said it was a 5BTV. The 80 meter or 3. Oct 20, 2015 · 160 Meter Inverted U Antenna my 5-BTV vertical and it works well 80 through 10 meters even though. The resource is currently listed in dxzone. (See Reference Links: PD7MAA End-Fed Antenna) for 80-40-20-15-10 meter long wire. They are different animals. Although local contacts can be made, the vertical helix does a much better job on DX. In practice, it is often much easier, quicker and more accurate to resort to the above calculator instead of creating a geometrical EZNEC coil model. I have a feeling that it was the loaded radials that was restricting my efficiency, not the loading coil in the driven element. If you have a grid dip meter (or a unit like the MFJ-259B Antenna Analyzer with the MFJ-66 grid dip attachment) you can plug in the coil and use the grid dip meter to see if the coil resonates at the operating frequency. Theory of Operation The loading. After a successful experiment with a 1/4 wave vertical for 40m we wanted to build a vertical for 20m too. Tuning of the antenna will be done by measurement of the SWR at each band. 73, Chuck dansawyeror wrote: All, I have been using an 80 meter loaded vertical for a couple of years with moderate success. Being lazy I never calculate anything. Center-loading (i. moved to VK1HW. The 80-meter kit features stainless steel hardware and hose clamps. Start at 80 meters. Once the results are obtained from this calculator, the coil can be easily modelled as a Laplace load within any EZNEC antenna model. Making a Remotely Switched Load Coil Now that you have built a flagpole antenna and the yard is filled with 32 buried radial wires to make a ground system you are ready for a tuner or better to make your own matching system. This doesn't really reflect what I've found. We hope CARA members have found this article useful and will take advantage of the. The upper load coil is used For operation on the 80 meter band while the complex the antenna height remains below 20 feet (610 cm). Mechanical details:. On 80 meters, the antenna is a very efficient top loaded antenna. The MA160V features a heavy-duty high-Q copper loading coil plus a wide 100-inch diameter stainless capacitive hat for high efficiency, resiliency and 1500-Watt power handling. 80, and 160 Meters (570,975 bytes, Vertical Antenna Loading Coils-- see LOADCOIL * Design short vertical antenna and loading coil. With the coil bypassed, the loop is resonant around 3800 khz. Effective HF Mobile Antennas 80 or 40 Meters is antenna efficiency. I set one radio aside and began working on the other one. I programmed it with six frequencies: 42, 46, 50, 52, 54, and 56 MHz (using the SHIFT-num entry method for frequencies above 50 MHz), and measured the synthesizer's Steering Line voltage at the SL test point on the RF board, in both transmit and receive. The antenna is capable of I KW PEP on 80-meters. Base Loading Philosophy Since the series combination of the 160 meter loading coil and 160 meter shunt coil has a very high impedance at 60 meters and higher, it was simpler to just leave them in the circuit for all other bands. A detailed look at how one can relatively optimize the Q of a loading coil. Orientations. A loading coil and an effective radiator is used for 80 automatic band selection achieved through a unique stub-decoupling system Meters --1kW PEP. 5 μH coil I picked up in a flea market, which I bought since it looked to be about the right value, and the length-to-diameter ratio is consistent with a low ESR (equivalent series. This will enable me to operate on 80 meters, which should help because 40 meters and the bands above 40 are fairly dead in the winter. My EZNEC simulation at 3. For example you may tap for 40 meters first, leave the 40 meter tap wire in place and then tap from that point on up to the higher frequency. NC High speed Cut To Length Lines are available a wide range with automatic coil loading, coil car carrier, hydraulic stacker/conveyor with high speed shear. 3/28/2017 – Installed the 80m loading coil. 80-Meter Loading Coil Assembly 1. 15MHz and 3. They are low loss. It will be seen the program compensates for ground proximity detuning by reducing the number of turns on the loading coil. I tuned the short antenna to resonance on 2 Meters with two spiral coils. Get the SteppIR Big IR Multi-band Vertical ST-00417 from Nevada Radio, with cheap flat-rate delivery and rapid despatch. That's why corona is a problem on 160 meter mobile antennas even at modest power. 0 meters below it as first cut (see above). between coils, and the height-to-width ratios are all important factors. Wolf River Coils offers a wide variety of products for your mobile, portable and base station needs. The reactance of the loading coil is 5584 Ω (at 475 kHz). It is true if you put a Capacity hat on top of a short mobile antenna it will change the antennas efficiency but what happens is the current on the radiating element moves further up to the top. 17 meters - 4uH 20 meters - 9uH 40 meters - 40uH 80 meters - 150uH Coilforms measuring approximately 3" diameter would be appropriate. Loading coils you build with insulated 14 or 12 gauge house wire are easily adjusted through the spacing of the wire when resonating your mobile antenna initially, and provide excellent circuit Q. If it resonates at too low of a. The loading coil is constructed from 1/4 inch copper tubing, and supported by a structure made from PVC plumbing parts. Twenty 40 foot radial wires are either buried or lay on the surface of the ground. Providing a good ground connection for the antenna is important for good SWR. Johns, W3JIP Air-dielectric inductors can be made quite easily at home. 3 However, this 80 m broadband performance is achieved in a slightly different manner. Doordat het stuk draad achter de loading coil kort is, wordt de bandbreedte op 80 meter ook erg smal kijk maar. One item you may be interested in: the 75 Meter modification employing a standard 40 Meter trap such as that used in the Alpha Delta or Unadilla multiband dipoles. 0 MHz in IARU Region 2, and generally 3. They were then connected to each end of the short dipole. ) With a simple linear calculation of length versus resonance frequency at the lower end, I removed approximately 25 feet of wire and the antenna was now resonant within both the 160 and 80 meter bands — resonances at 1. With the 10 meter ham band just above the CB band, the I-MAX 2000 will load up and work perfectly as a. Unfollow 80 meter vertical antenna to stop getting updates on your eBay Feed. 5 meters COIL LOADING. 5 μH coil I picked up in a flea market, which I bought since it looked to be about the right value, and the length-to-diameter ratio is consistent with a low ESR (equivalent series. In August of 2010, I. Loading coils radiate. Large wire has less resistance and carries more current. End Loading End loading (or voltage node loading – my term) requires a lump value equivalent circuit component. Coil Calculator The coil calculator tool on this page is designed to help you quickly and easily determine common coil sizes based on your specific requirements. 5 meters COIL LOADING. The Completed 80 meter coil Set up the PAC-12 antenna with radials and the 80M coil in place and check the SWR using a bridge or analyzer.