A loading coil and variometer combo for 630 meters (and maybe 1700 meters too!) A Few Simple CW Transmitters for 630 Meters. In the past, I've used low-mounted dipoles to cover Hawaii on 80-meters. The term originated in the 19th century for inductors used to prevent signal distortion in long-distance telegraph transmission cables. Optional Coils: L-3. My EZNEC simulation at 3. Above the parts. By the way, some dipoles are designed to be used on more than one band of frequencies. ) Good success was seen with a MFJ 1988T. 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. The coil was mounted on nylon screws and coils were made rigid with epoxy. 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. The main category is Homemade projects for 80 meter Antennas that is about Antenna projects for 80 meters band. 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. This is the most time consuming step. (And all my responsibility is hereby disclaimed!) I haven't personally tested these designs, but others have and found them to be satisfactory. More on mobile whips and inductive loading in Part 2. com offers 155 movement coils products. A (Mendalami 80 Meter Band Darwys (blog pemancar FM) RESTORASI PEMANCAR 80m AM Am80mkabul (80 mtr band power besar) Jakatriyana (teori2 tentang 80 mtr band) Blekok (80 meter band SSB) Blog kang odik (80 mtr band) Blog Kapal Cargo Dunasyngblog rahmattehnik. These DX Engineering 68 ft. You can use the same wire employed in the antenna radiators. (UNUNs are designed to work with resistive loads!). A Broadband 80/160 Meter Dipole An easy to build single wire antenna for 160 and 80 meters with a better than 2 to 1 swr across the 80 meter band. Top hat consist of about 170 meters of No. Includes all stainless steel hardware and til-over base. In this case you need 2 x 11m RG213 coax. MOUNT A mount must be used to isolate the antenna from ground. This combination acts to pull more of the RF current up the element increasing the antenna's efficiency. The system will work against earth ground or a. So, instead of being grounded the vertical works against a simulated ground made of some 1/4l radials or stubs attached to the base of the antenna to create an artificial ground plane at a few meter high, hence its name. No gain or much directivity but a dipole at 60 feet is a big improvement over the verticals that have been in use. Or figure the original coils inductance in uH from a Coil Calculator from a search engine. 0 meters below it as first cut (see above). Let me point out that "traps" are even more "lossy" than simple loading coils!. I have an 80 meter version of the. The Pro-Am antennas are very slender and have a low visual impact, see photograph (left). (And all my responsibility is hereby disclaimed!) I haven't personally tested these designs, but others have and found them to be satisfactory. I like to use a home made current choke to keep RF from coming back on the feedline. 64 wave has been one of the best kept secrets in CB and 10 meter antennas for decades. Band ranges are switched in the shack with the included bias tee on the feedline. Loading coils radiate. Magnetic Field Sensors. Real-time band. A close-up of the antenna with all four coils installed is shown in Figure 6. 2 µs for fast events. Repeat the process until the R reading is about 40 ohms when X=Ø =, or as close to it as you can. 0 MHz in IARU Region 2, and generally 3. The portion of the band used for phone (voice) communications is sometimes referred to as 75 meters. com in 2 categories. Its total length is 85 feet. Designed as part of the /backpack /base /travel /mobile /portable antenna system for transmitting and receiving on HF and HAM radio frequencies. The 80 meter or 3. 824MHz and 7. Fingerproof shields are available to prevent electrical shock. Very Short 160-meter Inverted-V Larry Nelson - K5IJB. Jorgenson KE7HR NSS 39382FE The need arose for a compact, cheap, antenna for the 75 meter HF amateur band to be used for cave radio communications. I'm thinking of adding a base loading coil between the balun and the monopole. patriot’s PATRIOT 80 Adjustable loading coil system Adjustable loading coil system, with 102′ whip it will resonate from 80m-12m, with 42″ whip it will resonate from 40m-10m, with a smaller whip it can tune from 20m-4m. 9 uH across the 160 meter band or very close to it. The 40M coil is shown in Figure 4 and the 80M coil is shown in Figure 5. 2011/02/13 日本語は下にあります。 [email protected]
Continuously adjustable loading coil is 36 inches long by 2 inches in diameter and weighs 2. Complete antenna system mounts on window frames, balconies, and railings. It is easy to install and adds the ability to have an antenna that operates efficiently on 160 meters. The coil was mounted on nylon screws and coils were made rigid with epoxy. The second 11m long cable is connected to the T connector as well and is open at the end. com FREE DELIVERY possible on eligible purchases. In February, 2006, I built a prototype antenna for Amateur Radio Direction Finding on the 80 meter band. A close-up of the antenna with all four coils installed is shown in Figure 6. ”Also, it seems that most CB-er "techs" rely simply on how good the antenna checks out with an SWR meter as for how "good" the antenna is. Verified Purchase. If you load the antenna with coils located at the end point of 40 meters, you may find yourself with a dual band antenna -- 40/80. 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. Antenna Loading Coil Calculation The calculation method is taken from a BASIC program which I got many years ago from OA4/KA2OIG who is hereby gratefully acknowledged. We have put the TTI TCB550 with the most popular, high profile, rugged CB antenna available on the market; base loaded heavy duty open coil design with good quality tapered whip gives this antenna that extra flexibility that truckers/greenlaners require from an antenna. Includes all stainless steel hardware and til-over base. MAST Select mast length to insure bottom of loading coil is at least 6 inches above roof of vehicle. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. The second 11m long cable is connected to the T connector as well and is open at the end. With the MFJ-269 meter my motto is build, test, cut, test. The 80 meter or 3. 5 meter from the tower hanging from an insulator 29 meters above ground. 647 MHz) renders the dipole resonant on the 80 (actually 75) meter band, while resistor R has as sole function bleeding off static charges, hence protecting capacitor C. 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. The coil was mounted on nylon screws and coils were made rigid with epoxy. 5 meters above it and 6. Looking up 160M mobile coils on the Internet most people talked about big diameter coils about 8" long. Improved in 24 Hours. Some of the radial wires are in a “natural” wild flower area and those are not currently buried. Voltage across the coil will be about 2800 volts peak for 100 watts applied. That is 70 feet long. 6 people found. These are rated full legal limit. Coil Loading Coil Storageis among most image we have reliably detected on the internet thought. Get loading coil online at best price. My back yard can easily fit a 40 meter dipole so I decided to construct a Half size 80 meter loaded dipole. March 1, 2016. The ground radial connector of the EHU is no longer in use and it is RF hot (!). Required loading-coil inductance as function of coil placement. DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY 435 S. It is simply a half wave end-fed on 80m which will resonate on all multiples of that frequency, loaded with a small inductance near the feed end. I like to use a home made current choke to keep RF from coming back on the feedline. Rated for 2KW PEP. 5 MHz band is a band of radio frequencies allocated for amateur radio use, from 3. , at the feedpoint) requires the smallest amount of inductance. Friday at lunch I asked the guys what antenna they would suggest. If you want 75 Meter operation make it 57 ft long. OK, was it just the feed line? 16 feet of wire would not tune below 20M without reversing the transmatch leads to the low-Z configuration. About 1% of these are steel sheets, 1% are inductors. Fan Coil Thermostat - 4 Pipe MCOHome Fan Coil Thermostat is a Z-Wave enabled device for indoor temperature control. The 80 meter wire started at 45 feet per side, the 40 meter wire at 32 1/2 feet per side and the 20 meter wire at 17 feet per side. To simplify design, loading coils are generally mounted at the bottom near the feed point or sometimes in the center of the vertical element. In this case you need 2 x 11m RG213 coax. Panel Meters. the range, namely the PHF80 for the 80 metre band and the PHF20 for the 20 metre band. I came across the following antenna which covers the 80-10m bands with no traps and just one loading coil. Of course ultimately its performance will depend on the quality of the radial network below it. Building an amateur radio antenna for 160 meters is a challenge. Loading coil Per the design, the loading coil is ~65% down the wire, with 11. 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). Then, for 80 meters, that first coil is simply a loading coil. Once you are happy with the coil you may choose to crimp or solder the wires to lugs or leave as is. SpecificationsTECO IEC Contactor - 80A, 220VAC / 60Hz Coil, 3 Pole, Lug (box-type) terminals, 600V, 2 N. Shipping to 240+ countries worldwide. vertical antennas allow you to achieve the strongest possible presence at your power level and be competitive. The ground loss for your radial system will be approximately 89% of applied power. This doesn't really reflect what I've found. -No trap or loading coil losses to worry about -Modest compromise SWR from 60-10 meters when fed with a 1:4 unun. Antennas at this frequency are large: A quarter-wave vertical, for example, is approximately 65 feet (20 meters) high. Inductor Q measures 290 at 4 MHz on an HP4101A, and on an Agilent vector network analyzer. With the sunspot plunge, a goodsignalonthelowbandwill beamust during the next few years. Buy solar panels and complete solar panel kits for home or business. ) Thickness : up to 4 mm (8 ga) One coil of 1 mm (19 Ga) thick material is about 2000 meters (6500ft) of material which can be processed, non-stop, and with a very limited scrap level. The Butternut HF2V Vertical Antenna I was glad to hear that Butternut Elec tronicswas producing a 40 and 80 meter vertical which could also be loaded on 160 meters. Page 6 Loading Coil Assem bly 80 METER CAPACITACESPOKES CAPACITANCE SPOKERINGS 80 METERLOADINGCOIL 40 METER CAPACITACESPOKES 1 1/8 x 17 Tubing Figure 4 80 Meter Loading Coil Installing the 80-Meter Coil Place the 1 1/8" x 17 tubing section of the fully assembled 80-Meter loading coil onto the top of the 20-Meter trap assembly (Item No. 5mm pada paralon 1″ OSCILATOR 80 METER BAND PEMANCAR 80 METER POWER BESAR (2) Posted by muchsin at 08:57. Hi All, I use a 2*8 meter dipole for HF. 59 million miles on his Hi-Q-5/80 antenna bought nearly 20 years ago. The antenna is capable of I KW PEP on 80-meters. I wanted an antenna on a top mount for my pickup, shorter than required for actual 6 meter 1/4 wave. Butternut HF2V for the 160-30 meter bands After my DX-88 died in a winter storm, I have decided to give the Butternut HF2V a try. B & W 850A Loading Coil Could it be something as simple as more inductance needed on 80 Meters demands smaller conductor size. higher frequencies. The Model 200A-HP is the extended length version of the original large high power which covers 10-80 Meters, built for SUV's, mini vans, Vans, or large pickups when mounting low in the vehicle. It also uses a large. This is the price paid for multiband coverage and physical short- ening. In February, 2006, I built a prototype antenna for Amateur Radio Direction Finding on the 80 meter band. Buy Schneider Electric TeSys F LC2F 3 Pole Contactor, 200 A, 80 kW, 230 V ac Coil LC2F115M7 or other Contactors online from RS for next day delivery on your order plus great service and a great price from the largest electronics components. Alat bantu yang disarankan adalah dengan menggunakan SWR meter. Connect the coil leads to the anaylzer SO-239 and be Xl mode. Make an Inquiry for Mill Finish AluminIum Coil for Roofing Panel 1XXX 3XXX 5XXX at OKorder. They can answer questions for any Yamaha outboard model or horsepower. VERTICALS MULTIBAND VERTICALS 80 Meters 40 Meters 20 Meters. MAST Select mast length to insure bottom of loading coil is at least 6 inches above roof of vehicle. The HF2 works on 40-80 meter bands and on 160 with an add-on kit. 9 uH across the 160 meter band or very close to it. 15MHz and 3. For correct readings, the impedance of the meter must match the 3-ohm voice coil winding. Includes universal mount/clamp, built-in antenna tuner with RF isolator, long 12 foot telescopic whip (22. DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY 435 S. 80 Meter Optional Coil for UHV-6. Home-made antennas can greatly improve the performance of AM and FM radios, short-wave receivers, and scanners. This antenna is so simple to put up. 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. This Unun is at a very high impedance point on 160 meters, so develops some very high voltages (up to 5000 volts or more, depending on power levels). 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. 5 80 meter coil L-18 17 meter coil L-14 20 meter coil. Some of the radial wires are in a "natural" wild flower area and those are not currently buried. MAST Select mast length to insure bottom of loading coil is at least 6 inches above roof of vehicle. I wanted an antenna on a top mount for my pickup, shorter than required for actual 6 meter 1/4 wave. This page starts by showing how to make loading coils for LF, and goes on to describe two of the loading coil assemblies used to resonate the experimental vertical antenna used at GW4ALG. 1 uH to 350 uH would be needed for the 160 - 12 Meter bands, the lower the frequency, the larger the coil. Works as advertised. This resulted in resonant frequencies at 7. There are 40 m loading coils at the ends of the 20 meter dipole which are parallel resonant at 20m. 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. It is a full size antenna on 40 meters and a shortened 80 meter antenna. 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. You can use the same wire employed in the antenna radiators. At this point, you may prefer not to solder one end of the coil. There has not been a. Radio sets SCR-536-A are issued with one set of spare crystals. All antennas are supplied with Tuning Aid FG-1. 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. 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. Construction of W6NL Moxon on Cushcraft XM240 Dave Leeson, W6NL The W6NL Moxon Yagi is a high efficiency two-element 40m Yagi that uses cross elements to provide both loading and Moxon coupling. A close-up of the antenna with all four coils installed is shown in Figure 6. The main category is Homemade projects for 80 meter Antennas that is about Antenna projects for 80 meters band. Mest, WBØAOF, has tried numerous types of antenna systems on 80 meters but the pyramid antenna is, by far, the best system he has found for him. Its total length is 85 feet. 0 out of 5 stars MC80 80 Meter loading coil. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m The 80-10m EFHW This is a shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1. 0 meters below it as first cut (see above). A mismatch of only 10:1 - that's a 10:1. But then it won't work on 80 unless you have some way to. Designed as part of the /backpack /base /travel /mobile /portable antenna system for transmitting and receiving on HF and HAM radio frequencies. (And all my responsibility is hereby disclaimed!) I haven't personally tested these designs, but others have and found them to be satisfactory. It was more stable, easier on crystals, and oscillated on 80, 40 and other bands by switching plug-in coils. This is the second antenna I purchased from them. Using Bottom Loading • Bottom loading at the base works, but burns some power • Using bigger wire helps (#10 good) • In the recent Stew Perry, N6NUL worked JA with 100 watts using an inverted L only about 35 ft tall designed for 80M, adding just enough coil at the base that his K2 auto tuner could load it! (It helps that he’s near. Heavy-duty loading coils and resilient stainless capacitive hats deliver high efficiency while handling up to 1500-Watts PEP. Coax attaches to an SO-239 connector and matching coil in the base. Wolf River Coils perform quite well. 8 MHz called for a coil diameter of 30 in. The Model 200A-HP is the extended length version of the original large high power which covers 10-80 Meters, built for SUV's, mini vans, Vans, or large pickups when mounting low in the vehicle. The design is a loaded vertical dipole (LVD) antenna, with a single loading coil and matching circuit at its center feedpoint. ) 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. But with these changes and an improved ground system, you might get a full (6 dB) S-unit improvement. Attention Hi-Q HF Mobile antenna owners! We are receiving inputs from customers, mostly from 18 wheelers that they have surpassed the Million miles on the Hi-Q antenna installed on their rigs. 5 x 16 cm Variable capacitors of 6000 V isolation Variable Coil more Reference MFJ989D. 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. I actually discovered this type of antenna owing to some problems with available space around my house. Works as advertised. Remotely Tunable 10 thru 80 meters. The VE2DPE 160 Special!. By placing the 80 meter loading coil further down each leg, efficiency on 80 meters is increased. summer training report to study various operations ofcold rollingmill submitted by: gaurav pandey ishu mechanical engineering 3rd year (0816140016) krishna engineering college ghaziabad bhushan steel ltd. Vertical Antennas, William Orr, W6SAI and Stuart Cowan, W2LX. On 80 meters the inductance in the traps allows each antenna leg to be only 50 feet overall length to be electrically resonant on 80 meters. MFJ 2910 160 and 80 Meter Matching Networks. This antenna is an excellent performer, and ruggedly built. Its total length is 85 feet. So for the higher frequencies the ground lead wire needs to be kept short. But it doesn't work in reverse -- traps won't make your 80 meter dipole work on 160. 5 MHz band is a band of radio frequencies allocated for amateur radio use, from 3. 40 metre loaded dipole summary This was an enjoyable project which offered big rewards for my efforts. Coax attaches to an SO-239 connector and matching coil in the base. This antenna is a 10 meter long vertical for 80 and 40, with extensions available for the 160 and 30 meter bands. 2kW, two air cored inductors wound on fibreglass formers, which function as traps on 40m and loading coils on 80m, plus lengths of 450 ohm ladder line and insulated copper wire to form the antenna elements. 15MHz and 3. Fig 2 - A ½-λ version of the antenna in Fig 1. For use on 80 meters it would be fairly short (63 feet or 19. delta loop using two separate lengths of 10 meter plus 10 centimeters each of No. Hi All, I use a 2*8 meter dipole for HF. The 80 meter or 3. On 40m, it worked a treat. It is a full sized 40m dipole, and the 80m loaded dipole is cut so that the center part is a 20m dipole. This antenna is 58 ft tall and is mounted on a hinged base. Untuk antena bisa menggunakan antena yg simpel semisal antena lahan sempit atau fertikal dengan ujung loading coil. An 80 meter dipole (3. Loading Coils for 160-Meter Antennas, Charles Michaels, W7XC, QST magazine, April, 1990. The SS Whips used for 10 meters clearly show how superior a full size element with no loading coil is. Assuming a practical limitation on how large one can make the capacitance structure above the coil, there is a restriction on the loading-coil loss. Covers all bands 80 Meters through 6 Meters including WARC Bands. The loading coils isolate the extra wire. 308 Industrial Park Road 10, 15, 20, 40, 80 Meter Starkville, MS 39759 (662) 323-9538 Fax: (662) 323-5803 INSTRUCTION MANUAL General Description The Hy-Gain 18AVQII is an omni-directional, vertical radiator that operates on the 10, 15, 20, 40, and 80 meter amateur bands. It is therefore important to cut the. The output of the coil is connected to the RF connector of EHU. Buddipole Coil Set, These coils come standard with our Buddipole, Buddistick, and mini-Buddipole antennas. A single wire off the tower like that seems like a great. To increase the magnetic field in the loop and thus its efficiency, while greatly reducing size, the coil of wire is often wound around a ferrite rod magnetic core; this is called a ferrite loop antenna. Import China Chilled Water Coils from various high quality Chinese Chilled Water Coils suppliers & manufacturers on GlobalSources. The 160-Meter Coil. A loading coil and variometer combo for 630 meters (and maybe 1700 meters too!) A Few Simple CW Transmitters for 630 Meters. We start with a tightly wound 14 awg insulated wire coil. An 80m flattop somewhat higher fed by ladderline beat it by a few db on both 160 and 80m. Coil-Shortened Vertical Antenna Calculator. Coil-loaded 40/80 Meter Inverted V Dipole Antenna The loading coils used in making this antenna are from a diagram by IK1ZOY based on a project by I2CN. I'm thinking of adding a base loading coil between the balun and the monopole. But then it won't work on 80 unless you have some way to. I have given much consideration to the coils used, and to their placement in the loaded antenna. Use Output Meter T-585/U (or equivalent), set for a 3 ohm load. The shorter the length of the antenna, the more performance suffers and the narrower the bandwidth will be with loading coils, especially on 40 and 80 meters. We hooked a homemade SWR in- dicator in the coaxial line at the base of. The bandwidth limitations on 160 and 80 meters can be largely offset with an antenna tuner. Each side of the dipole is broken up by a coil that presents a high impedance at 40 meters and acts as a loading coil on 80 meters, allowing the antenna to resonate on 80 meters even though it is physically shorter than a half-wavelength (approximately 130 feet at 3. The Hy-Gain 18AVQII is an omni-directional, vertical radiator that operates on the 10, 15, 20, 40, and 80 meter amateur bands. It converts the 20 Meter to 80 Meter tuning range into full 160 Meter band coverage. 5 MHz band is a band of radio frequencies allocated for amateur radio use, from 3. The 80m and 75 meter bands add-on coil for all Super Antenna MP1 series antennas. DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY 435 S. An 80m Broadband Matching System. MF SOLUTIONS 630 Meter Transmit Converter: 80 m to 630m, 25 W output? Antennas. The total antenna mast ,loading coil and top hat can be lifted with one hand. Real-time band. Example: N6HH has 2. MFJ MFJ-63 Loading Coil - 3. Handles 25 Watts. Power Outlets. About 1% of these are steel sheets, 1% are inductors. The result is a “rope antenna” about 6. Top-capacitance loading improves radiating efficiency in two ways:. I am in a very restricted area and wanted to join a net on 75 meters that meets early in the morning. Great but Cheap Coil Id, Cheap Consumer Electronics, Computer & Office, Card Readers, Tools as well as Cheap and more! Online Get Best Coil Id You Need from Aliexpress. Both the 80/40 meter wire and the 20 meter wire are connected in parallel at the bottom. 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. 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. Continuously adjustable loading coil is 36 inches long by 2 inches in diameter and weighs 2. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected]
Providing Customers with Lighting Solutions, Quality Products and Outstanding Customer Service for 40 Years. Some of the radial wires are in a “natural” wild flower area and those are not currently buried. Total length is 130ft of wire for 160m reduced to 90ft due the loading coil. Top loading is the most efficient loading method known. They may look alike but they do not have the same electrical characteristics. 80 meter Sloper array Use small center loading coils and relays to switch the director and reflector. More support for the coil would obviously be required. Customer pays for shipping of replacement product. The two taps on the coil will need to be soldered, and. It is mounted on my roof , near the sea at about 50mt above the sea level. Total length is 130ft of wire for 160m reduced to 90ft due the loading coil. 5 meters COIL LOADING. The legs connected to the “shield side” of the coax are a little shorter, and the coil on that shield side 75/20 meters leg has a few fewer turns than calculated. Trap coils are waterproofed and condensers are epoxy-sealed. I built the antenna on the ground and tuned all three bands with my MFJ analyzer. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. Two (2) Graco 5:1 pumps with reliefs for new oil, One (1) Graco 1" diaphragm pump with 4-way valve for evacuation and discharge of waste oil tank. 2kW, two air cored inductors wound on fibreglass formers, which function as traps on 40m and loading coils on 80m, plus lengths of 450 ohm ladder line and insulated copper wire to form the antenna elements. Parallel L/C resonators provide automatic bandswitching with full-band coverage from 7. The coil was mounted on nylon screws and coils were made rigid with epoxy. By placing the 80 meter loading coil further down each leg, efficiency on 80 meters is increased. L1 selects the 160 meter tap on the coil. He just worked his 10,000th contact with his Wolf River Silver Bullet 1000 coil. Wire Antennas For Limited Space Loading Coil for short 80/40M Dipole Everything On the Roof Does Double Duty • 80 Meters - No significant. The output of the coil is connected to the RF connector of EHU. About Coil-loaded 40/80 Meter Inverted V Dipole Antenna The resource is currently listed in dxzone. A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance. I did have design and construction pictures on this web site previously. I used to have a 160/80/40 dipole with loading coils sold by a W9, now SK. 12 inches above roof if loading coil is within 2 feet of body of vehicle. MATCHING COIL HD-80 for 10 - 160 Meters. I understand generally that the 80 meter band needs more coil windings tapped than the 40/15 tuning, and the 10 meter band bypasses the coil altogether. Listed loading coil manufacturers, suppliers, dealers & exporters are offering multiple buying options for loading coil. Its total length is 85 feet. It also uses a large. The trade off is that there are several stray resonances of the antenna system using this coil, but none of them cause any problems with normal operation. This means that for 20, 40, 80 and 160 meter band all mobile antennae and for base stations for 40 , 80 and 160 meters an extension coil is used causing major loss of efficiency and bandwidth. Another type of mobile use for a loading coil is in a 2 meter, 5/8 wavelength antenna. Handles 25 Watts. The antenna is resonate on both bands and does not require an antenna tuner. HVC18: 17m Loading Coil for HV7A & MV3A. Check the coil inductance with an antenna analyzer to be sure it is 1. 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. I used a 17. moved to VK1HW. 64 Wave Secret. The 80-meter kit features stainless steel hardware and hose clamps. 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. Again I went for resonance on the lowest part of the band. I would still appreciate some. Replace AIR5 with the resistor given in the parts list which has the closest value to the setting of the decade resistance box. But it started out as an 80 meter antenna feed with 50ohm coax, i did not have the room to make it full length so i made it with coils 3/4 the way down and tuned it to 80 meters my taking winding off. QRPGuys Portable 80/60m Vertical Antenna – $20 Expanding on our experience of using the readily available $10 eBay telescoping 17′ fiberglass fishing poles for a vertical support in the Tri-band Vertical Antenna, we are offering a portable 80/60m, center loaded, 15′ long vertical antenna. Continuously adjustable loading coil is 36 inches long by 2 inches in diameter and weighs 2. It is a full size antenna on 40 meters and a shortened 80 meter antenna. 9 MHz in Regions 1 and 3 respectively. my slopers antennas for 80 and 160 mt. 36) in each of the 16 holes on the capacitance spoke rings mounted on the loading coil assembly (Item No.