065", 12 gauge is. The DS1 Antenna is a small, portable, vertical antenna system for 40m thru 10m. There are four optional HF coils available: HVC7 (40m), HVC14 (20m), HVC18 (17m), and HVC21 (15m). Homebrew vertical dipole I've been looking around for good ideas for a portable HF antenna and finally settled on Robert Johns' (W3JIP) plan from a QST article (Aug 88). A vertical center mast support assembly. The vertical element slipped over the toilet brush and a hole drilled through the tubing and handle holds the whole thing in place. Tune this length for 40m (It will be a loaded ½ λ) Loading coil 30μH 9:1 balun VK2TGO – 20/08/2014 Design for a portable, low power (<25W), end-fed half-wave antenna. Because of the "shortening" effect of the series capacitor, the upper coil. 44 inches center to center, measured parallel to the trap. A silver wire winding on good isolation materal may produce a coil with Q ~= 250, an air based large diameter loading coil could have Q ~= 800. One element is marked with two stripes and contains a small inductive load. One Killowatt rated components guarantee electrical safety. Thus, I desire to bring some closure to this vertical installation and make it the best it can be. The Loading Coil is close wound directly onto the pole 6 feet below the antenna top and measures 30 inches in length and 20mm diameter at this section of the pole. We will not have any other components available. 40m Dipole on 15m. 00 Add to cart; Bag for CrankIR Tripod Stand $ 47. As for the ground rod, my understanding is that it helps with safety (static etc. 914mm in diameter. I made a tap at 11 turns for the 30M band. It will be seen the program compensates for ground proximity detuning by reducing the number of turns on the loading coil. Theory of Coil Antennas Trilochan Fadhi Division of Engineering and Applied Physics, Harvard University, Cambridge, Mass. Carl KM1H----- Original Message -----From: "Bill and Liz McHugh" To: Sent: Saturday, April 23, 2011 8:02 AM. This small vertical is using a combination of coil base-loading (40m) and linear-loading (20/17/15m) About 5 feet is bent over at the top on purpose so you can reach the end to short/open the leads, so the height is really about 8 feet. 5 mm copper wire with black plastic jacket. Degrees of a Loading Coil. When adding coils, the impedance drops to about 20 Ohm. 5 inch PVC pipe. Wolf River Coils offers a wide variety of products for your mobile, portable and base station needs. The OD of the coil housing is 1/2 inch. This is the 30m coil and the plug in the middle is where the vertical radiator wire plus into it for 30m. Additionally there is a flat angle of the MA- 1. The antenna described here is a 32 foot vertical antenna for the 160m band, which is made out from an Butternut HF2V 80m and 40m dual band vertical. It typically takes 2500 uH or more for a base-loaded antenna with a big top hat, and about 5,000 uH for a simple base-loaded 15-meter vertical with a 1. Feedpoint detail. T he purpose of the calculator is to give you a quick overview of the feasibility of "squeezing" a loop into your available yard or apartment space. soft aluminum or copper tubing. All else being equal, the coil losses will more than double, and therefore the input impedance will be close to 50 ohms (no matching needed). The long dimension acknowledges the lowest design frequency (40M). Yagi and parabolic antennas When designing a Yagi antenna, you might think that the most important parameter is forward gain. When it comes to designing a vertical with a loading coil the two major items for the shopping list are the metal tubing for the element and an appropriate former for the coil. ④Trap radials could be concentrated. Threading Rollers - Guides pipe into tamer and supports the pipe. conditions weren't great but I had two QSOs, a 20m SSB one with a station in Washington State and a 40m SSB qso with one in Louisiana. > > 80m SWR table:. 5" gave me resonance in the CW portion, and 2:1 SWR bandwidth is at least 150 KHz. Then shorten the top-hat wires about 50cm each. Homebrew 20 Meter DiPole Antenna speaker wire. bottom tap connected to antenna ground/bracket, center tap connected to antenna connector and end tap connected to antenna radial. 80m and 40m Dual-band Vertical Antenna CP8040 ・Parts Description Operation Instructions (Fig-1) ・Description ①The CP8040 is a dual-band vertical antenna for HF low band. For the 30m and 40m bands, the T-bars are left at the 20m length, and loading coils are placed in series with the balun. 18 wire spaced 1/8 inch between turns. 4 M42001 Tapping screw M4x8 M42017 Inner tooth washer M4 M42018 S trap M42006 Inner tooth washer M4 M42018 Tapping screw M4x8 M42017 Pipe No. Or the other way around: Two coils in parallel, connected in serial to a second pair of parallelly connected coils. I intend to build a vertical out of metal tubing and have capacitive top loading (old TV antenna?) I need a solution for a center loading coil. 50” down from the 30m loop or 2. 40 meter quarter wave vertical with loading coil 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. • Never place this antenna in a location that will permit people to encounter the loading spokes or any other part of the antenna. Having an end loading / capacitive hat in the form of an eggbeater (spherically formed wires), which called “Valcosphere”. I cut a hole in the bottom of the trash container to fit over the toilet brush and mounted it upside down on the brush stand. Ive sold one of my 40M 4el KLM's and made a pair of CC style 2el from the other. The result is a lightweight inductor with great power handling and a Q near 1000. The stock 5BTV 80 Meter top loading coil is nearly identical to their mobile antenna top loading antenna. It is a full size antenna on 40 meters and a shortened 80 meter antenna. I had a lot of trouble with relays arcing due to voltage across the base loading coil when using high power on top band, the problem was cured with the relays. Finally, the 8ft tails are shortened to bring the resonant point to the desired part of the 80m band. sciencewriter. Antenna Loading Coil Calculation The calculation refers to either a loaded 1/4 wave (typically a vertical, in which case flip the picture below through 90 o) or a loaded dipole, in which case the dimensions refer refer to one arm and two coils will be required. These are: 1. This a approximately 900 micro Henrys. long, about the size of a 40m dipole. However, the Q of a long skinny coil with wide spaced turns is much less than a conventional coil. Auto-tuner must be located directly at the base of a non-resonant antenna for best operation. 4m longer due to the second dipole arm and the longer length of the long whip. Yuri Blanarovich, K3BU. KZ2I TA-33 with 40m dipole vertical antennas •Use loading coils and. On 80 meters, the antenna is a very efficient top loaded antenna. The spiral top loading can be applied to a l10 m long vertical and operate at 3. RF Coil Construction; Construction. Loading coils radiate. Ideally this coil is designed to shorten a 40m antenna, however it could also be used for other bands or as a High-Q inductor. For whips and verticals. The basic Buddipole is a kit of coils, rods, telescopic whips, coaxial cable feeders packaged with several other components in convenient carry bags that allows the user to construct a variety of antenna that are capable of operating from the 40M HF bands up to and including the 2M VHF band. The spiral top loading can be applied to a l10 m long vertical and operate at 3. Constructing a dipole for 160 meters with a length of approximately 254 feet and a height of 50 feet or higher will produce a low angle of radiation. Hello, I am interested in building a vertical antenna for HF. Optionally available is the "TLK" top loading kit for better bandwidth, as well as extension kits for 160 and 30m. It also acts as a loading coil on 80m. I added a loading coil at 13' to get it resonant on 80. The lower coil has one end connected to ground or earth and the 50 ohm feed from the transmitter is tapped onto the coil 15 turns up from ground. 20m, 40m or 80m Ground Mounted Radials for Vertical Antennas $ 12. 50” down from the 30m loop or 2. • Measuring Efficiency of a Loop or Vertical Antenna • Evaluation of My Loop -Comparison to Verticals the loading coil inductance and placement the length of the antenna the ground resistance High-power LMR-400 40m 16. My last vertical antenna experience relevant to the Hex Array came from the MFJ-1792 antenna. The vertical radiator is 15'8" long and seems to be just right for the 20, 30 and 40 meter bands. and can handle widths from 12″ to 84″. Figure 2 shows the EZNEC comparative gains (dBi) and radiation patterns. On 40m, loading coil lengths of approx. It has the following major characteristics: 1. 11 turns of 4mm² isolated Cu wire will allow you to tune to 7 Mc. The loading coil is wound on a PVC pipe with 1/4 inch brass bolts in each end. Gives various advantages over a dipole antenna. The antenna uses an aluminium radiating section and two loading coils to permit performance on two frequency bands. 18 wire spaced 1/8 inch between turns. The stock one is very narrow band due to its reduced size. Use 2 inch schedule 40 PVC for the top and bottom coil forms. Now should the middle load coil in our 40m vertical design was made to be a full wavelength, thus around 560ohms inductive reactance, then the four base radials would. Justin G0KSC has combined the use of high-efficient, wide-spaced coils and capacity loading to produce a 12m wide 40M rotating dipole with a radiating efficiency of just over 89% along with all-band coverage. 7 When to Use A Vertical • Larger commercial verticals on 40M-10M - Install high, with good radial system • Efficient wires on 160-80M - Low or on ground, with good radial system - Top loaded or full quarter wave • A few verticals don't need radials - Cushcraft R7000 is center-fed, W1JR design • To fill in nulls off ends of a high dipole When Not to Bother With A Vertical. Basically, the loading coil is operating as a trap. The garden here at PZT Towers is 50ftx20ft so a full-length flat-top dipole/doublet to get me onto 7MHz was out of the question…. The problem at the moment is that I first have to finish my remote antenna switch and install the necesarry cables. Another option is a shortened dipole using loading coils. center loading coil with taps every four turns. Notice the very wide bandwidth for such a small antenna. Rotating Dipole 40m-6m. Referring to the manual, we can conclude that the diameter of the sphere is about 1 m. SCH 20 PVC pipe is often used for sawdust collecting systems. My Favorite Loop. 1 meters (20 feet) in length. 7 W and 16 radials is 33. It is a very basic construction made up from around 6m of vertical wire and 4 ground rods with 2 toroid coils in line for 40m (coil no. Coil loss varies by frequency between -0. This is the price paid for multiband coverage and physical short- ening. Form the bare copper wire into a circle to create the ground bus wire and solder. It is therefore, a 1/8th w/l vertical on 80m, brought to 1/4 w/l resonance by the (mostly) base loading coils. Model 2: Extended 40m Vertical w/ 1 counterpoise. The antenna design is a vertical dipole (6M to 40M), using a loading coil at the base of the vertical with a tap and the other half the dipole is formed with a 1/2 wave length. To get to 110µF I used 76 turns. Another approach is a vertical whip with center and/or bottom loading coils. 50” down from the 30m loop or 2. 0 cm director = 91 cm, distance between these two = 25 cm, gamma feed distance from centre = 20 cm):. The 28 foot vertical element, and the matching and loading coil, are made with insulated 12 AWG solid wire used for electric utility service. The 160m leg is another 63ft and has a loading coil 4ft long with about 40ft of wire space wound on it to reduce the length as I was pushing getting this thing on my small footprint of land. - Assembled in 20 minutes by two persons. It is top loaded with a loading coil, wound on fiberglass with Teflon coated wire. The radiation resistance of a short vertical monopole. 00 Add to cart; BigIR High Wind Kit Reinforcing Plate (Fiberglass) - Replacement $ 47. It will be approxiamately 10 metres long end to end. My Favorite Loop. 2 φ10 M42002 Hat M42008 Hat ring M42011 ・Description ① The KV2 is a dual-band. A loading coil and perhaps a disk, spoke, or swirly capacitance hat is the telltale sign of a vertical high-Q loaded antenna. On 40m, the antenna's 2:1 VSWR bandwidth is about 73kHz. The problem at the moment is that I first have to finish my remote antenna switch and install the necesarry cables. The overall length of the loading coil is 4-1/2 inches and my guess at the length of the coil itself is around 3-1/8 inches and measures 1. 4m long with a loading coil 0. Normally, I would have used PVC tubing for a coil form, but I wanted to see if I could gain efficiency with the toroids. The Delta C-140 has a number of unique benefits. 73 / 44 / Ahoj. Will need control cable and Guy rope. 70 cnts) pair of Tx/Rx modules. This is the Take it Along (TIA) portable antenna which helped the National Parks on the Air (NPOTA) winner snag many, many QSOs. 4 MHZ, series cap for 80m operation, loading coil for 160m 80m Z11, 20 ohms ideal gnd, 160m Z11, 5 ohms ideal gnd. Auto-tuner must be located directly at the base of a non-resonant antenna for best operation. The radiation resistance of the antenna is not affected by the coil. The coil is the most recognizable form of an inductor. 4 M42001 Tapping screw M4x8 M42017 Inner tooth washer M4 M42018 S trap M42006 Inner tooth washer M4 M42018 Tapping screw M4x8 M42017 Pipe No. No loading coils are used on these bands. SteppIR Antennas : Tel: 425. The MA-160V features a heavy-duty high-Q copper loading coil plus a wide 2. Design goal is to have a high as possible radiation resistance and keeping loading coil losses as low as possible. 914mm in diameter. 8" long (effective tuning range 6" or 10-80 M) More Pictures: (click to enlarge). It then morphed into a dedicated 160 metre vertical with a bit of length extension and three near top loading wires. A design by VK3JEG is only 66-ft. 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. Here's you chance to build your own antenna. It is also ideal for shortwave listening. 5 db due to the shorter boom length of 12 meters (40') versus 14. Threading Rollers - Guides pipe into tamer and supports the pipe. 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. 000,- HEAPY DUTY HANDEL POWER 5 KW. 4) Loading coil losses are only a first-order estimate; YMMV depending on your loadinbg coil's construction. An effective system of ground radials is even more important with a shortened antenna. 5 inch PVC pipe. The AV-640 uses quarter wave stubs on 6, 10, 12, and 17 meters and efficient end loading coil and capacity hats on 15, 20, 30, 40 meters. For the loading and matching-section coil forms, I use 11/4-inch-diameter pipe so the antenna can be mounted reasonably close to the vehicle. Coil Cradle. This antenna configuration produces a high angle of radiation, consists of a loading coil in each leg resulting in n. http://www. Finally, tune the antenna to resonance by unwinding a bit of the coil and shortening the vertical wire from the bottom. This is an attempt to create a multi-band, end-fed halfwave using toroid cores for winding the loading coils. On 40m, loading coil lengths of approx. The Cushcraft MA160V is a compact efficient vertical antenna especially designed for working top-band DX from an average-size garden. Find many great new & used options and get the best deals for PROCOMM PCF40B 40m MONO BAND HAM VERTICAL MOBILE HF ANTENNA HAMSTICK STYLE 500W at the best online prices at eBay! Free shipping for many products!. Vortex now offer a reduced size 40m 2 element array with two very high-efficiency loading coils on each element. To get to 110µF I used 76 turns. To the left is the 3/8-24 mounting bolt. zThe auto-tuner is now the loading coil of a base-loaded short antenna. A loading coil for 80m As the days grow shorter with the approach of winter and activity shifts towards longer wavelengths, I took stock of my log and noticed that while I have racked up a reasonable number of contacts on 15, 20 and 40 meters, 80 meters lags far behind. The ends of top-loading capacitance structures should be smooth or balled t0 reduce the chances of corona discharge Spiders, discs, and other horizontal elements, such as crossbars, have a greater capacitance to the mast below the coil thar vertical members such as whips, so they should be somewhat above the coil if they're large. For details, please visit our Products section. The SOTA Special has a Mini coil and 66" whip for ease of backpacking. The coax feedline runs up the center of the bottom antenna element and is shielded by it. Hy-Gains new AV-640 Patriot HF vertical is the best built, best performing and best priced multiband vertical available today. 1MHz)? The lower portion of my vertical I'd prefer to stay 6M as not to cut the alu tubing (this is both radiator and structural support. From Reg, G4FGQ Vertical Antenna Phasing Arrays - From Butternut Antennas Vertical Antennas & Ground Screens-- By N6RK VHF Antennas - Various -- From The ARRL W5QJR Antenna Via Antennex. The antenna cable was then threaded through the cleat and secured with a nylon tie-rap as shown in the image above. On 40m, loading coil lengths of approx. A vertical antenna (effectively half a dipole operating against a ground plane) is resonant at one-quarter wavelength. Auto-tuner must be located directly at the base of a non-resonant antenna for best operation. Figure 2 shows the EZNEC comparative gains (dBi) and radiation patterns. When you open the coil, you can bring the resonance to 10. I removed the 80 and 40 metre loading coils, but retained the 160 metre base loading and added a 12-foot. There's a hidden factor at work here too. Vertical Antenna Loading Coils-- see LOADCOIL * Design short vertical antenna and loading coil. Also, an optional base load coil option is available to extend band coverage to 60 and 80 meters. Ive sold one of my 40M 4el KLM's and made a pair of CC style 2el from the other. Without Radials. ) To calculate the length of a full-size dipole, use the Dipole Antenna Length Calculator. It is also ideal for shortwave listening. To convert inches to mm, multiply by 25. 00 ** Online. By applying with a newly developed a High Q loading coil and power durability and capacity hat, it makes it possible to offer high. Also, a hairpin matching coil is placed across the. 5 turns coil. 13m long Limited stock! Now $699. A 33' (10m) vertical of heavy duty construction for use on 5 bands between 40m and 15m. It is designed for any outdoor portable applications where weight, portability, and ease of setup is a prime concern. To operate on 40m the BW Vertical utilizes both coils for loading the antenna. A detailed look at how one can relatively optimize the Q of a loading coil. It is a very basic construction made up from around 6m of vertical wire and 4 ground rods with 2 toroid coils in line for 40m (coil no. The MA-160V is a compact vertical antenna which is designed for DX on Top Band. au/morton-national-park/pigeon-house-mountain-didthul-track/walking. Ham Radio and Amateur Radio online equipment sales. I made a tap at 11 turns for the 30M band. I used standard 40mm PVC pipe from B&Q and 20SWG enamelled copper wire, which is 0. (The initial SWR was below 1:7 on 40 meters but I had to gut it and rebuild it using better components). When the lengths of both the mast and rod are set to zero and the coil is long and narrow, a simple helical antenna results. The overall length of the Workman 40M HF Stick Antenna is 7’ – 10”. radials and vertical element. The capacitance elements can cause injury and or severe RF burns. Making a Remotely Switched Load Coil Considering tune the vertical for 40M to work okay as a 3/4-waveIength vertical on 15M and the same for 30M and 10M respectively. It is attached to the deck railing at the 9' level and guyed at 24'. The 28 foot vertical element, and the matching and loading coil, are made with insulated 12 AWG solid wire used for electric utility service. Ive sold one of my 40M 4el KLM's and made a pair of CC style 2el from the other. I chose the distance between the two capacity hats for a resonance at 20m without loading coils: Vertical dipole for 20m (no coils) and 40m (w. This is the new base loading coil made for the 160M vertical. A 1/4 wave vertical is a good choice but is 33 feet long and requires lots of radials for acceptable efficiency. Capacity loading is the most efficient loading method but typically is not capable of reducing elements by more than a few percent. The antenna is made from 40mm PVC-U, polypropylene, waste pipe by the looks of it and has a wall thickness of 2. 80m, 40m, 20m, 15m, 10m and 6m (3. This is my implementation of it. The loading coil and variometer consists of two windings wound on a 110mm diameter stormwater pipe. Such an antenna might be about 33% efficient on 40m. 42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip. > > My results seem very odd, but maybe not? Looking for advice. Vary the distance of the AN/PRR-9 from the ID-1189/ PR, or adjust the ID-1189/PR RECVR TEST SIG. Optionally available is the "TLK" top loading kit for better bandwidth, as well as extension kits for 160 and 30m. 43 ft Vertical Shown with base loading coil for 160 m and RF choke Comparison between 43 ft and 50 ft matched base-loaded verticals at 3. Therefore, as you move the coil toward the end, there is a balancing of competing efficiencies. Comet base station antennas. 4 M42001 Tapping screw M4x8 M42017 Inner tooth washer M4 M42018 S trap M42006 Inner tooth washer M4 M42018 Tapping screw M4x8 M42017 Pipe No. I have a friend that has built a shortened 40m rotary dipole and from what he’s says I can assume that I works pretty good. Since the element is a bit short for 40 meters, a loading coil wound around the tubing tunes the vertical to 40 meters. Vertical Antenna Loading Coils-- see LOADCOIL * Design short vertical antenna and loading coil. for which I was hoping. 000,- HEAPY DUTY HANDEL POWER 5 KW. • Never place this antenna in a location that will permit people to encounter the loading spokes or any other part of the antenna. Garden aesthetics also demanded antennas have as low a profile as possible; consequently it would have to be base loaded as a large 160m loading coil swinging in the air. As will be seen from the following description of several Figures, there are several principal components of the capacitance terminated short vertical radiator system of the present invention. The overall length of the Workman 40M HF Stick Antenna is 7’ – 10”. The coax feedline runs up the center of the bottom antenna element and is shielded by it. Loading coil is formed by pvc pipe dia 1 inch, and copper wire dia 1 - 1. L2 may vary in size from 1 to 20 turns, and L3 will contain between 5 and 10 turns, typically. 40m is currently working with NO coils (top hat loading only). Several vertical radiator wires hang down from the top-load, each attached to its own ground through a loading coil. 9% efficiency. The design is a loaded vertical dipole (LVD) antenna, with a single loading coil and matching circuit at its center feedpoint. Coil Cradles are efficient & effective systems for loading coil, threading and uncoiling medium to heavy gauge material. - the former is 130mm long with the top 20mm turned so it can be inserted into the bottom section of the vertical. Finally, I tried loading the baseline with lump inductive reactance (coils). Cradles are available as a separate uncoiler or in combination a straightener to form a cradle-straightener. The 20m loop ended 22. The one on the right is 7 turns, and. 80M Base Loading Coil for the BigIR Mark IV Vertical $ 446. Coil Inductance Calculator. But a resonant 160 meter vertical is more than 120 feet high. We designed and built this antenna to mount just below our tri-bander at about 70’ on a crank-up tower. 40m is currently working with NO coils (top hat loading only). or 7,000 lb. Each coil has 3 recessed channels which allow for nearly a hundred tapping options. From there, I went through several iterations of testing and adjusting to arrive at the final values. Calculations, of course. On 40m, the antenna's 2:1 VSWR bandwidth is about 73kHz. Wire is fairly easy to conceal. (4 R) Two coils in serial, connected in parallel to a second pair of serially connected coils. The extra loading and electrical length of the wires from the added coil caused my SWR to go up a little bit from before, even after the element length correction on bands where the coil. loading coil for use on 80, 40 and 160. Richardson, Texas Phil Salas - AD5X AD5X Auto-Tuners & Short Antennas Auto-tuners provide flexibility zYou don't have to re-tune antenna every few KHz. A high-Q loading coil should be placed near the center of the vertical radiator to minimize losses in a shortened vertical antenna. Homebrew vertical dipole I've been looking around for good ideas for a portable HF antenna and finally settled on Robert Johns' (W3JIP) plan from a QST article (Aug 88). 065", 12 gauge is. MFJ MFJ-67 40M Big Stick Loading Coil 3/8-24 Stud. HV7A Mobile Antenna System General Information HV7A has 5 band capability—6m/2m/70cm, plus 2 HF bands though use of loading coils. This is the most time consuming step. There are four optional HF coils available: HVC7 (40m), HVC14 (20m), HVC18 (17m), and HVC21 (15m). The top of the coil directly bonds to the upper vertical section with a jumper wire (hidden) on the far side of the plastic insulator. The coax feeder has to be routed as far away from the lower part of the antenna as possible. Antena Onidireccional 11 Metros (Ringo) APARTMENT ANTENNA, HF, 40M-2M - MFJ-1622. (UNUNs are designed to work with resistive loads!). Normally, I would have used PVC tubing for a coil form, but I wanted to see if I could gain efficiency with the toroids. My 40 meter vertical cost me $13. A bent quarter-wave vertical (in inverted-L configuration) seemed the best approach and the answer was inspired by G4EIE's advice "you need a whacking big loading coil". Loading the MOXON Inductive loading, "linear loading" similar to the 402BA and other shortened yagis, helically loading, or capacity hat loading can reduce element length. Coil is 16 turns 10AWG, 4 turns per inch on a 3. Short verticals are inneficient and offer lower bandwidth that the reference vertical antenna. 9% efficiency 50 ft -3. 5 inches above the end cap, 13 inches of tightly wound twin lead, the remainder of the twin lead spread evenly up to the top of the first section. 5 to 1 and also moved up the low SWR dip to 6. 67) electrical building wire was used. Figure 2 shows the EZNEC comparative gains (dBi) and radiation patterns. One Killowatt rated components guarantee electrical safety. What usually occurs if a Yagi antenna is designed solely for maximum forward gain, though, is that the front-to-back ratio decreases. I have a friend that has built a shortened 40m rotary dipole and from what he’s says I can assume that I works pretty good. Recent query by I0JX and discussion on the Antenna Newsgroup about the behavior of Beta Match - "trombone" or loading stub - hairpin on the performance of the antenna stirred some interesting arguments. efficient vertical antenna requiring no radials and a 21° take-off angle. Yuri Blanarovich, K3BU. For whips and verticals. To change bands, I turn the switches to select the coil tap for the desired band. The baseloaded vertical, with its loading coil at ground level, makes exotic coils possible, but the better solution is Antenna 4, the T with the horizontal-wire top load. To get to 110µF I used 76 turns. Louis Vertical, widely known as the SLV, is a great all band vertical antenna for portable use. More designs can be found by Googling “80m loaded dipole. Otherwise there will be loss due to coil resistance and skin effect from adjacent turns. Beta Match - Hairpin, Stub affecting the element. My first few SOTA activations used a 40 meter dipole slung from branches at 5 or 6 meters. The heart of the antenna is the 5"x8" loading coil housed in a LEXAN SEALED housing and tuned by a 12 or 24 VDC gearhead motor. 0 MHz without gaps. This would include dielectrics on or near the inductor, since the presence of dielectrics would increase undesirable capacitance. Also, a hairpin matching coil is placed across the. for over 50 years. 80/40m Dipole. The HV7A is supplied with HVC28 (10m) loading coil. • Loading changes antenna characteristics – Feed Impedance, Gain and Angle of Radiation – • No reduction in the requirements for – height above earth – ground/radial systems • With expedient application of the loading the efficiency of the system can be kept high – Apply ‘end’ loading first – Apply inductive loading in the.   The loading coils enable the antenna to be a lot smaller than the full size version making it more practical to carry and set up. You know that the original telephone wires, the unshielded twisted pair, or UTP, wasn’t the best transmission medium in the world. The coil effectively stops the RF current flowing in the final 2m or so of wire at 7MHz and above. conditions weren't great but I had two QSOs, a 20m SSB one with a station in Washington State and a 40m SSB qso with one in Louisiana. Here’s you chance to build your own antenna. Vary the distance of the AN/PRR-9 from the ID-1189/ PR, or adjust the ID-1189/PR RECVR TEST SIG. The term is also used for inductors in radio antennas, or between the antenna and its feedline, to make an electrically short antenna resonant at. Loading Coils for 160-Meter Antennas, Charles Michaels, W7XC, QST magazine, April, 1990. I was interested in something a bit more compact that was optimized for the higher bands. (Calculator opens in a separate page. On 40m, feeding the vertical is direct, there is just one big shunt coil for DC path On each 160 and 80m, I put a shunt L followed by a serial coil which provides the missing CW-to-SSB. http://www. Total resistance is the same as for a single coil. The coil form is a one foot length of 2. ) and also very widely spaced (>3 in. vertical antenna loading coil vs toroid: [email protected] Extra loading inductance is added in series with the existing resonating coils to bring the resonance down to Top Band, and some components are removed. 2 φ10 M42002 Hat M42008 Hat ring M42011 ・Description ① The KV2 is a dual-band. On 40m, loading coil lengths of approx. The factory recommended 0. Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils, jimlux, 23:35; Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils, jimlux, 23:30; Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils, David Gilbert, 22:40; Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils, Michael Tope, 22:08; Re: [TowerTalk] 40m 4el KLM - replacing. This is the most critical part of the adjustment, as the Q of the loading coils is high and the bandwidth over which the SWR is acceptable is narrow. for over 50 years. Ham Radio and Amateur Radio online equipment sales. The 80M coils use 1. The antenna cable was then threaded through the cleat and secured with a nylon tie-rap as shown in the image above. xyz on January 14, 2007 This weekend, Dennis (N5DRB) and I made a loading coil for the second of our AD5X portable vertical antennas. July 19, 2014September 17, 2014 Vertical Delta Loops 99 The Vertical Delta Loop • A three sided loop is known as a Vertical Delta loop sitting on the ground. The antenna itself is 3. LC at bottom could be fine, but wonder if I can improve it locating LC higher. See Figure 2. 8 MHz and 3. 3 Element 40m Vertical Parasitic Array (VPA) Vertical Yagi Essentially, this is a single 1/4 wave vertical antenna with ground radials, complimented by a pair of parasitic verticals; a reflector and a director. au/morton-national-park/pigeon-house-mountain-didthul-track/walking. It’s got a bottom loaded coil to get on 40 meters. 80m and 40m Dual-band Vertical Antenna KV2 ・Parts Description Operation Instructions (Figure-1) Pipe No. K6IF/W6BDN 40 Meter Rotatable Dipole. Changing the band just by changing the alligator clip is a very welcome option. HV7A Mobile Antenna System General Information HV7A has 5 band capability—6m/2m/70cm, plus 2 HF bands though use of loading coils. This antenna will need a 19mH loading coil, that has a reactance of over 16k. 3 uH loading coil, 54% from feedpoint (21 turns on Amidon T200-2) to fit 40/15m dipole in roofspace (total span 15m) Detail of end-isolator with wires folded back and twisted for fine tuning the dipoles for the lower frequencies Detail of end-isolator with clamp for fine tuning the dipoles for the higher frequencies. A pigtail with alligator clip is connected to the lower brass bolt. 00 Add to cart; Connector Junction Box $ 204. , not the 10 ft. 80m and 40m Dual-band Vertical Antenna CP8040 ・Parts Description Operation Instructions (Fig-1) ・Description ①The CP8040 is a dual-band vertical antenna for HF low band. Referring to the manual, we can conclude that the diameter of the sphere is about 1 m. Ive sold one of my 40M 4el KLM's and made a pair of CC style 2el from the other. This gave a SWR of 1. The Hamwaves inductance calculator can help you design a loading coil. Make full use of your sunspot cycle with the Patriots low angle signal. I have given much consideration to the coils used, and to their placement in the loaded antenna. The 80M coils use 1. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. We compare design, practicality, price, features, engine, transmission, fuel consumption, driving, safety & ownership of both models and give you our expert verdict. Note Vertical Antenna Design-- Trap and Loading Coil Losses With Vertical Antennas By W0DN The Effects of VSWR on Transmitted Power--By James G. The loading coil consists of ten turns of 16swg (1. Position #1 is the coil bypass mode for 40m and up, positions #2 to #6 are the coil taps for 80m and 60m. By expanding, the copper tubes are closely fitted with the aluminum fins, so as to realize higher heat exchange efficiency. No loading coils are used on these bands. 40m Linear-Loaded Dipole I stumbled-upon this antenna design whilst searching for something resonant, but not too lossy for 40m working. MY BIG VERTICAL ANTENNA PROJECT This memorandum describes my Fall antenna project, specifically a DX-Engineering, Model DXE-MBVE-1, 43 foot mono pole vertical antenna. 00! With that said, go look up the cost of one that is being sold in the magazines and on the web. 4 100W capacity 0. 6mm) diameter copper wire with one end. 4 M42001 Tapping screw M4x8 M42017 Inner tooth washer M4 M42018 S trap M42006 Inner tooth washer M4 M42018 Tapping screw M4x8 M42017 Pipe No. 7 meters (48'). The antenna cable was then threaded through the cleat and secured with a nylon tie-rap as shown in the image above. using a flat circular tophat which is- very effective capacitive loading andfor practical at 40m. When the loading coil is installed at the bottom of the vertical radiator, we call it a "base loaded" antenna. It’s not hard to tap the loading coil to allow it to be used on both bands. 5 inches above the end cap, 13 inches of tightly wound twin lead, the remainder of the twin lead spread evenly up to the top of the first section. radials and vertical element. (Calculator opens in a separate page. The reactance of the loading coil is 5584 Ω (at 475 kHz). A standard dipole antenna is resonant if constructed with a length of one-half wavelength. The coil effectively stops the RF current flowing in the final 2m or so of wire at 7MHz and above. More information on Pigeon House Mountain – Morton National Park. The production speeds up to 60m/min, which can produce different profile through change quick-change cassette easily. Hustler Antennas has produced quality antennas and antenna accessories in the U. The SLV works well on 40 meters, but can be finicky on some of the higher bands as its 20 foot total height becomes a difficult electrical length. I intend to build a vertical out of metal tubing and have capacitive top loading (old TV antenna?) I need a solution for a center loading coil. A 33' (10m) vertical of heavy duty construction for use on 5 bands between 40m and 15m. First it covers the whole 40m band without an ATU with an SWR of less than 1. vertical antenna loading coil vs toroid pass filters in the vertical as coil and cap hats as opposed to coils for the 40M vertical i have over 0220khz of <2:1. The dimensions of the coil I used are 4 inches of BW coil stock #3026, or 4 inches of 8 turns per inch on a 2 inch diameter form. I wanted high efficiency 40 Meter antenna with low-angle radiation. As my vertical is around 5. A deep zero-point ensures that the antenna does not pick up the local QRM. Garden aesthetics also demanded antennas have as low a profile as possible; consequently it would have to be base loaded as a large 160m loading coil swinging in the air. Discussion: The first line shows a simple 50 foot tall wire vertical antenna with no top loading. 40 meter quarter wave vertical with loading coil. The coil was some sort of heat exchanger I recovered from the Engineering dumpster and have repurposed to serve as a coil. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials. The vertical whip is 81cm ( a shade under 32 inches). Shortened vertical antennas have a coil to electrically fill the gap of shorting the radiating element. 25” up from the bottom of the antenna loading coil. The vertical is bottom-loaded with a coil wound on an insulated former (nylon or similar material - it is not too critical at 50MHz). vertical antenna projects for the 40 meters band category is a curation of 41 web resources on , Vertical antenna for 40 and 80m, Slink-ette antenna, The Hudson antenna. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. This shortened easy-to-build vertical, with no-radials, is made from surplus military camouflage poles. My Favorite Vertical. The web site…. Its BTV (vertical) antennas continue to set the standard for trapped vertical antennas, delivering the best reliability of any multi-band vertical on the market. M2 Antenna Systems, Inc. It is attached to the deck railing at the 9' level and guyed at 24'. I had a lot of trouble with relays arcing due to voltage across the base loading coil when using high power on top band, the problem was cured with the relays. I calculated the values for the loading coil using some online calculators (see notes below). 1 meters (20 feet) in length. The vertical element is taped to the 22 feet of tubing above the radial attachment point. That’s a tall order – literally! Shorter whips need to be tuned to resonance with coils, and these are lossy. On the connections that can be mounted clamps tightened. 70 cnts) pair of Tx/Rx modules. 00 Add to cart; Balun 1:1 SO239 Connector, External Vertical or Dipole $ 85. The dimensions of the coil I used are 4 inches of BW coil stock #3026, or 4 inches of 8 turns per inch on a 2 inch diameter form. 40m center loaded antenna, 2. This loading inductor is near the bottom of a 43-foot tall vertical. A design by VK3JEG is only 66-ft. The machine is easy to operate, of high precision, and reliable. I cut a hole in the bottom of the trash container to fit over the toilet brush and mounted it upside down on the brush stand. A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance.   The loading coils enable the antenna to be a lot smaller than the full size version making it more practical to carry and set up. M2 engineers developed a new coil using light aluminum 3/16" wire with a copperweld coat. The antenna is tuned for each band (10m to 20m) by changing the length of the T-bar elements. 00 Add to cart; Balun 1:1 SO239 Connector, External Vertical or Dipole $ 85. Also, an optional base load coil option is available to extend band coverage to 60 and 80 meters. Trent Fleming wrote: > In a recent ham magazine, there is an article about an HWV for 160m I am > very interested in having an antenna for 160m, and in having a vertical for > the low bands in general. Base loading requires the smallest amount of inductance to achieve resonance. 00 Add to cart; Element Truss Kit $ 126. No loading coils are used on these bands. The reason is, a 160 meter loading coil is about 5 times larger (in inductance) than an 80 meter loading coil. A loading coil located in a remote tuner will result in even significantly less field strength. Coil Cradles are efficient & effective systems for loading coil, threading and uncoiling medium to heavy gauge material. First for 40m, moving the coil in the mast from base to :. This needs some final tuning, but gives a low SWR across 80 and 40m, and SWRs below 3:1 across the higher bands. 65' 1" Off-Center Fed Dipole long leg: 43' 5" + short leg: 21' 8" made from an Evans W1JC shortwave antenna (sim to Princeton Sky Wire) Spi-Ro 4:1 balun resonant on 40m (fundamental) plus 20m, 10m, and 6m (harmonics). axle options. A Top Loaded Vertical on 80/160 • Inverted L • “Tee” – vertical • Load it against radials or a counterpoise • Use what you can install – It doesn’t need to be perfect – Longer/bigger is better – Do your best and call CQ! A Top Loaded Vertical on 80/160 • Ideally would be quarter wave vertical – 70 ft on 80M – 135 ft. Loading Coil for 7MHz M45007 Mast bracket M45019 Radial nut Spring washer M6 M45024 Spring washer M6 M45024 V-volt set M45020 80m and 40m Dual-band Vertical Antenna CP8040 ・Parts Description Operation Instructions (Fig-1) ・Description ①The CP8040 is a dual-band vertical antenna for HF low band. 000,- HEAPY DUTY HANDEL POWER 5 KW. An antenna loading coil is an inductor placed in series with an antenna element in order to lower the antenna’s resonant frequency. The antenna is resonate on both bands and does not require an antenna tuner. An antenna loading coil is an inductor placed in series with an antenna element in order to lower the antenna's resonant frequency. For the 40M loading coil, I ended up with 29 turns of #22 enameled wire on a T130-2 toroid. The AV-18VS may be installed on a short 1-5/0 inch dimeter mast driven in the ground. The feed point and loading coil at the base are not 1000 watt rated regardless of what the MFJ specs say. The loading coils of a short dipole must therefore be positioned away from the ends but still be closer to the ends than to the center feed point. io Subject: Re: [steppir] Installed Steppir BigIR Vertical with 80m loading coil Thanks everyone for your ideas, I edited all the frequencies outside of 80m and got about 1. Each coil has 3 recessed channels which allow for nearly a hundred tapping options. Loading Coil for 7MHz M45007 Mast bracket M45019 Radial nut Spring washer M6 M45024 Spring washer M6 M45024 V-volt set M45020 80m and 40m Dual-band Vertical Antenna CP8040 ・Parts Description Operation Instructions (Fig-1) ・Description ①The CP8040 is a dual-band vertical antenna for HF low band. Wire supports are 3/8” diameter Lexan rod and coil. 000,- HEAPY DUTY HANDEL POWER 5 KW. Coil Cradles are efficient & effective systems for loading coil, threading and uncoiling medium to heavy gauge material. Loaded 160m and full size 80m dipole. Traps and loading coils are not. Garden aesthetics also demanded antennas have as low a profile as possible; consequently it would have to be base loaded as a large 160m loading coil swinging in the air. 40m center loaded antenna, 2. Coil loading instruction Coil as ‘permitted commodity’ due to possibility to damage containers and vessel’s hull, unless you can follow attached procedure and it is responsibility of booking line any loss/damages caused by coil shipment but not properly followed by below procedure. Q=800 is approximately the best we can attain for a practical coil in this application, and Q=600 may be best achievable. Base loading coil is used on 20/30m/40m. Thanks Peter for the inspiration. Vertical tube expander. Loading Coil = Enamel 1,8mm , 90 turn , 1 inch diameter , 18cm length Magic Antenna , Just 3m total length open dipole for 40m bandReady to DX Just need small space , you don't need a tower , you ready to DX just 7m high antenna from the earth. Stock availability and shipping volume can delay shipping. A vertical antenna (effectively half a dipole operating against a ground plane) is resonant at one-quarter wavelength. A loading coil located in a remote tuner will result in even significantly less field strength. However, if we experiment with inserting the coil into higher locations in the vertical radiator, we find that the current distribution on the antenna. By using coils, it would provide a single wire baseline and maximize the loop height reduction. A 1/40th-wave, 160m antenna might consist of a 2-metre long slender coil with a 1 metre rod or. Loaded 160m and full size 80m dipole. The already low input impedance of a quarter-wave vertical will become even less as you shorten the antenna. Extra loading inductance is added in series with the existing resonating coils to bring the resonance down to Top Band, and some components are removed. The vertical radiating element is 20ft long. Enter the desired frequency and select the wavelength. The next step in my pursuit of 630 meter Shangri-la, also known as Nirvana, was to build a loading coil and variometer to match my existing low band antenna structure to the new band. 2:1 over both 40m and 20m bands. MY BIG VERTICAL ANTENNA PROJECT This memorandum describes my Fall antenna project, specifically a DX-Engineering, Model DXE-MBVE-1, 43 foot mono pole vertical antenna. Changing the band just by changing the alligator clip is a very welcome option. For the buddipole, each coil is pre-marked in various colors which correspond to the amateur bands of 10m - 40m (7 bands) (see reference chart under documentation). The HWV does not eliminate the loading coil, it just replaces it with a very long skinny coil that runs the length of the antenna. Total length of antenna in feet Open the dipole length calculator in a separate page. Mobile Antennas. 5 inch PVC pipe. The light weight and modular design makes the antenna particularly suited for portable applications, but it is also well suited for other. This antenne worked fine on 20m and probably great on 10m, but the efficiency on 40m was very limited. Likewise with two loading coils at the feed point of a short dipole. http://www. My plan was to put the coil between segments 2 and 3 on the vertical, about 1. A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance. A top loaded vertical antenna has several advantages over the conventional vertical, but the biggest advantage is that it's shorter in length. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] There's a hidden factor at work here too. There are four optional HF coils available: HVC7 (40m), HVC14 (20m), HVC18 (17m), and HVC21 (15m). A loading coil located in a remote tuner will result in even significantly less field strength. 5m up from the feedpoint. 065", 12 gauge is. Comes with Vertical element, Controller, Guy hardware Kit and Mounting pole. Antena Vertical para 27 mhz. Likewise, for the top hat loading, each of the radials may replaced with four 100ohms inductive reactance load coils on the 40m band, the 50ohm coax then connected to this point. Expanding on our experience …. Trucks hauling steel are 'constant problem' coils when they should limit their load to two. Some readers will note that this is close to the same length as the popular 5/8λ 43 ft vertical for 20m. Total length of the antenna was now about 38' tip-to-tip. But I was going to load the antenna with mid-element coils, per GM4JMU's design. The coils are built from 3/4" PVC risers with threaded caps on each end. 40m: Get the squid pole with centre loading coil resonant and working with a 1:1 (or very close) SWR on 7. The final design comprises: a vertical wire radiator 8. The feed point and loading coil at the base are not 1000 watt rated regardless of what the MFJ specs say. efficient vertical antenna requiring no radials and a 21° take-off angle. 2 φ10 M42002 Hat M42008 Hat ring M42011 ・Description ① The KV2 is a dual-band. 7 GHz 18dBi MT-405013/C/F MCX 3. My first few SOTA activations used a 40 meter dipole slung from branches at 5 or 6 meters. Describes how a 1. 5 uH depending on the actual input impedance of the antenna in question. Degrees of a Loading Coil. A vertical antenna element shorter than λ/4 at the required frequency would be capacitive. (The initial SWR was below 1:7 on 40 meters but I had to gut it and rebuild it using better components). 42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip. So for my holidays, I used my double coil holiday end-fed; about 8m of wire with two coils; a 15 uH coil acting as 10m trap and loading coil for 20m + 40m and a 30 uH coil acting as a 20m trap and loading coil for 40m. It is an excellent all-around 40 meter antenna for those who don’t have room for (or can’t afford) a yagi, but want more than an inverted V. 5 m vertical can be loaded by a spiral coil to operate between 1. The loading coil and variometer consists of two windings wound on a 110mm diameter stormwater pipe. A loading coil or trap which is introduced to improve performance on the LF bands will have an impact at the HF end. More designs can be found by Googling "80m loaded dipole. The top coil consists of approximately seventeen turns of the same wire. A New 630m Loading Coil & Variometer I've decided, for the time being, to keep my 2200m (136kHz) antenna tuning system separate from the 630m system. The second version used two regular lightbulbs with shorter filaments. • Measuring Efficiency of a Loop or Vertical Antenna • Evaluation of My Loop -Comparison to Verticals the loading coil inductance and placement the length of the antenna the ground resistance High-power LMR-400 40m 16. 1MHz)? The lower portion of my vertical I'd prefer to stay 6M as not to cut the alu tubing (this is both radiator and structural support. The loading coils measure 12. Here's you chance to build your own antenna. Your best bet is to design your own. The already low input impedance of a quarter-wave vertical will become even less as you shorten the antenna. Trent Fleming wrote: > In a recent ham magazine, there is an article about an HWV for 160m I am > very interested in having an antenna for 160m, and in having a vertical for > the low bands in general. The first one is the 40m prototype, the second one a 2 m long centre loaded vertical with a roller-inductor loading coil: VHF and UHF antennas need not be monsters either. 1 Electrical details of the Minooka special. I used standard 40mm PVC pipe from B&Q and 20SWG enamelled copper wire, which is 0. The coax feedline runs up the center of the bottom antenna element and is shielded by it. When the loading coil is installed at the bottom of the vertical radiator, we call it a "base loaded" antenna. The light weight and modular design makes the antenna particularly suited for portable applications, but it is also well suited for other. Beta Match - Hairpin, Stub affecting the element. (And all my responsibility is hereby disclaimed!) I haven't personally tested these designs, but others have and found them to be satisfactory. When adding coils, the impedance drops to about 20 Ohm. The loading coil at the top of the antenna is a piece of Close-up view of the matching coil. The vertical radiating element is 20ft long. Use the Coil Inductance Calculator to design your loading coil. 7 meters (48'). The MFJ-1622 Apartment Antenna covers 40 through 2 Meters, mounts outdoor to windows, balconies, railings, and works great indoors mounted to. Coil Loading Procedures 250; Coil Loading Procedures 250. coils wound on small plastic bottles 2. The basic Buddipole is a kit of coils, rods, telescopic whips, coaxial cable feeders packaged with several other components in convenient carry bags that allows the user to construct a variety of antenna that are capable of operating from the 40M HF bands up to and including the 2M VHF band. I have worked out the coil dims for this using a 1-1/4″ PVC pipe coupler as a coil form. 2:1 over both 40m and 20m bands. I made a tap at 11 turns for the 30M band. 00 Select options; Remote Driver Board Kit $ 411. Fabricating The Loading Coil.
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