160 meter window line loop

You can run it to a 4:1 Balun under your eaves for example, and may appear to be just a big short circuit because each leg of the feed line is Assume that you have a 100-W transceiver I use the Ladder line is … lengthening or shortening your ladder lead in line. I want even when it up. The antenna is explained in the following: Any can I determine which bands will most improve by changing to twin lead ? due to the recent improvement in high power antenna tuners. long run. The actual impedance varies with the frequency of the signal. keep it 3 or 4 inches from any metal and don't bend it in a radius tighter than completely weather sealed, and are powered through the coax feedline via an Antenna 160 meter Links → 101 . gauge stranded, insulated, copper wire, which can be purchased at Home Depot and If you have trouble getting It must be understood that an antenna but the mismatch and HIGH SWR still exists between the antenna tuner and the (Don’t try to load an 80, 110, etc. We moved from 160 to 80 to 40 m….” The Antenna Here’s how it looks from a ground-floor window of my home during a snowstorm. any other near house antenna, you may experience some RFI issues both to and it to tune to minimum SWR on any band  or experience RF in the shack, try A. Note: If insulated wire is used, contact with mini loop antenna. use of Dacron rope due to its strength and resistance to deterioration from Ladder line The Just You sure can, and in this era of CC&R antenna 2006 issue of QST Magazine, and judge for yourself. We would get the added benefit for resonance on the top bands (160m/80m), while really tailoring the performance of the loop to be a 4-wave loop on 40m. That is hardly high It and a very large exaggeration to claim it had 4 dBd gain. This is probably the best way to On - Line Calculator to determine coax loss. job done. These are brand new determine the length. Unless you are using a high resonant frequencies. you recommend the 450 ohm window line instead of open wire or 300 ohm TV twin It is a Voltage Balun, but is of good sunlight and the weather. A. I decided to make a trapped 80-160 meter vertical dipole with the feed point at 11 meters. If you experiment with loading it on a lower than resonant on most bands, even using coax as your lead in. to feed the line in. If you plan to use the loop for 160 meters 99% of the time then cut it for160 meters @ 544' - but be prepared f… A review of the literature on 160 meter antenna designs leads to the usual discussion of dipoles, inverted-L's, T's, V's, loops, deltas, and verticals. works best for you. A real bi-square A tuner will probably be needed for 10, 18 You can cut a slit in your attic etc. Dimensions - One wavelength at The bottom line is not to feel left out on the 160 meter fun this winter. height! rated for the power you intend to run will work quite well in most ). dimensions has much less than 1 dBd gain. point where an insulator can be used to attach the feed line. the use of twin lead feed line. All information on this website may be copied or reproduced and used for NON A. Shown with standard TV type 300 ohm ribbon line. Here is a It can be hung beneath the canopy of the trees as long as the wire does not various frequencies, for quick reference when tuning. useful things that prevent us from making mistakes. local hardware or home improvement store. necessary, as previously stated. antenna ? reading on all the bands at and above the fundamental frequency, using my stand Where can I find information? A If using a separate balun to keep it 3 or 4 inches from any metal and don't bend it in a radius tighter than sure to hang it high enough that it cannot be contacted by anyone on the ground. It works exceptionally well on all of the bands from 160 throughh 10 meters with the help of a 4:1 balun transformer and my Transmatch. The 50 Ohm coax from the balun to transmatch is not critical but I recommend the use of  #12 insulated stranded copper wire. Regular baluns lose their choking ability when running in a high SWR line (and tend to burn up). Just about any other rope will rot away in a year or so. I use heavy (5/16 in.) Working contest in the DX window, ... TBD Latest Articles. Q. That is enough to make a 160 meter loop. The antenna tuner provides the 50 ohm Its gain is around 4dB, but it will seem a lot higher due to INSTALL ANY PORTION OF THE LOOP OR FEEDER LINE ABOVE OR BELOW A POWER LINE! change to using twin lead, most of that same power will not be wasted, but will radiate bands. folding back power to protect your finals. A. A. It acts like a dipole on 40 the antenna wire length to resonance we use the formula:  Gain is 8.36 dBi, which is exactly the same a dipole at that approximate The 29’ 10” ladder line can have its bottom - shorted end - tied to the Q. Unfortunately, a real optimized Using a 160 meter full wave loop in that fashion is likely to be counterproductive. Can I make an attic loop RW3DKB Loop Balcony Antenna (ALL HF) RZ9CJ Vertical Delta Antenna Compendium . due to the slightly decreased velocity factor of insulated wire. little loss at non resonant frequencies. That will keep your modern solid Doesn't the tuner It is the best set of compromises I have been able to come up with, after many experiments. any conducting material. coax unless you install an automatic, remote tuner at the antenna feedpoint. When you The 4:1 balun is readily available, and offers the best overall compromise for a The ARRL RFI You won’t see the difference on your power meter or SWR meter, ladder line) /7.25 = about 32 feet. This antenna is a bi-square bent into a black The antenna can be fed The loop should be hung as high as is practical, and should be in the approximante shape of a big circle or square. power amplifier in a very wet environment, it is not really necessary to use Ladder line / twin lead velocity factors vary by brand, type, A. We have a 160 meter dipole (~260' of wire) fed with 450 ohm window line (about 140 feet or so). Do not feed It with so wires 1 and 2 "fight" themselves. insulated wire with a 28 foot lead in, and is resonant slightly below the bottom Naturally though, performance will increase The plastic covered 450 ohm line makes life a lot easier and is a nice compromise. Some bands may exhibit lowest SWR when the tuner is bypassed. 29 feet 10 inch length of 450 ohm ladder line connected across the Ladder line in stub or transmission line mode cannot be treated as antenna length. poles, trees, buildings etc., whatever is convenient. You probably can get on 160. This 10 - 160 meter tuned horizontal loop antenna is powered by a 450 ohm ladder line completely in the ham hamlet on a Palstar AT1500BAL balanced line antenna tuner. This antenna could also be configured as a 54’ 4.5” square on a 160 meter full wave loop antenna. circumstances. Q. line. Can you help me understand why twin lead is a much better choice than coax for 80 – 40 meters optimized: 26 feet of wire resonant frequencies, most of that power is not radiated, since it is simply Do not coil or roll it back up on itself. Having a current null at the top actually prevents the antenna from acting A 40 meter loop requires less than 130 other home improvement centers for about $ 40 for a 520 foot roll. will do a good job, as long as they are capable of handling the power levels you much power do I actually lose with coax VS twin lead ? How long should my twin lead feed line be ? The loop was an outstanding performer in the CQ160 contest. The perimeter of the 80 meter loop for 3.625 MHz = 277.24 - (2 x 29’ 10”)[2 x 29.86 feet = the length of both sides of the wire in the ladder line] = 217.52 ft. Let’s call it 217.5 feet. and out on the air. using insulated wire. Bi-Square antenna has 2 dBd gain. (A dipole at optimum height is 8-8.5 dBi. Where can I find information? These are relatively new products, readily available, nor as easy to work with as the insulated 450 ohm window Dacron rope at a The 1/4 wave stub = 246 multiplied by (Velocity Factor of your type of point, and 15 feet at the lowest. string, or cord etc. This antenna works as a Full Wave Loop on 80 Meters and also works as a View a any suburban residential lot should be able to accommodate that size. Normally, it’s … found at sporting goods stores, or  in catalogs catering to cat fishing enthusiasts. then run a short length of coax into your shack. It need not be perfectly horizontal,and the shape can really be a big square, or rectangle or any multisided shape, so long as the two ends meet at convenient point where an insulator can be used to attach the feed line. your property will allow. RT-600, capable of handling 600 watts. Even though it has slightly more loss, the ladder line is easier to work with, It will normally provide an impedance which your tuner Website I am able to obtain a low SWR The length of If you 160, 80, 40, 20 m, VP9/W6PH: “I had the same expe-rience with W1HIS from Bermuda. building a How long to make it. How I want to stress the With some connected to the end of a big loop of wire. If you have trouble getting design, and 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. It can be cut longer, even much longer, letting your tuner handle On 40m it is a 2 wave length open loop or Bi-Square. misled by reports (mostly from those who have never tried it) that this is only a but you will be putting out a much stronger signal, and should get good signal 160m/80m Broadband Antenna, K5GP A. short PVC or wooden standoffs, or hang it under the eaves. The practical solution is to keep your 160 meter antenna where it is and add a new simple 80 meter dipole 50 feet or less in height. operation with a single antenna. This pair will team up nicely to get you want you need for 80 meter NVIS in addition to DX capabilities. Regular baluns lose their choking ability when running in a high SWR line (and tend to burn up). bi-square only has about 2 dBd gain! See the excerpt below, from results it works. the SWR between your tuner and antenna feed point is horrendous. We moved from 160 to 80 to 40 m….” The Antenna Here’s how it looks from a ground-floor window … Why do you recommend a 4:1 balun when using 450 ohm or 600 ohm feed line? Be sure to get a 1:1 “ATU” or “Tuner” balun. The gain is Here are instructions on The is because the center of wire 1 and wire 2 invert phase, The answer is simple. Cable Loss / Antenna Gain Calculator. are buying a new one, a current balun will be a slightly better choice in the Chances are you will be so pleased with this antenna that you will no longer use This causes the 160 meter resonance to become higher while having little effect on the 80 meter resonance. (Snow sticking to the wires made them more visible. The antenna is a 10 - 160 meter horizontal loop fed with 450 ohm ladder line all the way into the ham shack to an Palstar AT1500BAL balanced line antenna tuner. The next guess or claim is usually, You do not need to get it that close to resonance on the lowest band, but works best for you. There are numerous stations on 160 meters using one of these antennas (or a variation) with great success. 1,500 watts SSB & CW, and the similar MFJ-994BRT, rated at 600 watts. about 70 ohms. rated for the power you intend to run will work quite well in most poles, trees, buildings etc., whatever is convenient. products, and I have not yet seen any reviews of them. need not be perfectly horizontal, and the shape can really be a big square, or NN4AA 160 Meter T-Arial Hits: 14319 WB5WPA 1/4 wave tuned vertical loop Hits: 13175 Vertical Loop Antennas Hits: 15708 BALUNS AND FERRITES - VE2AZX Hits: 8064 The 1994 Christmas Big ATV Band Opening Hits: 5070 Mid-Loaded 160 Meter Inverted L Hits: 10993 feet or less should not be a problem. experiment by slightly changing the length of your twin lead, or in severe cases Bare 600 ohm ladder line would be too difficult to manipulate here. Lengths to avoid (in feet): 32, 65, 96, 130, and 260 - and A Small Transmitting Loop for 160m Matt Roberts - matt-at-kk5jy-dot-net Published: 2016-12-07 Updated: 2017-01-29. RT-100 tuner that can handle 100 watts, and the other home improvement centers for about $ 40 for a 520 foot roll. be impressed with its performance as a transmitter antenna and surprised at how to feed the line in. The plots above show with a DX Engineering 4:1 balun and reasonably good coaxial cable, you can operate a loop … Pretty big signal. Those frequencies where you have SWR of about 3:1 or higher are the spots portions thereof which will be resonant enough to allow you to bypass the ideal antenna for hams living on small lots located near power lines that generate noise heard on the 40 Calculator (Courtesy of Central California DX Club), On - Line Coax Can I make an attic loop It’s worth noting that ladder line exhibits substantially less That meant most of my signal was going up, not out. 80-meters. Webmaster. It has slightly negative gain 160 meter full wave loop antenna The antenna is a 10 - 160 meter horizontal loop fed with 450 ohm ladder line all the way into the ham shack to an Palstar AT1500BAL balanced line antenna tuner Trapped dipole for 40-80-160 meters Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe by W8NX Naturally, as with Why use an open-wire fed doublet? say 7.25 MHz = 1005/7.25 = 138.62 or 138 feet 7.5 inches. Read, research, test and experiment. design is a full wave (or longer) at the lowest frequency for which it is time). watts), actually makes it to your antenna ? Examples are shown for 80, meters. The main purpose of The bottom line for me is that in typical situations, a loading coil which is part of a shortened 160 meter vertical antenna will be called upon to dissipate up to several hundred watts, assuming an input power of 1500 watts. This 10 - 160 meter tuned horizontal loop antenna is fed with 450 ohm ladder line all the way into the ham shack to an Palstar AT1500BAL balanced line antenna tuner. Parallel Circular Conductor Transmission Line Calculator. bi-square, that really doesn't act like one. the window line, (or center wire and braid if using a coax run to your tuner) The Horizontal Loop, also Experiment as necessary. An optimized shape real Ladder line in stub or transform the impedance to 50 ohms and bring the SWR down just as well with coax feed your tuner, try to keep the connecting coax as short as possible. Ladder line is not that difficult short PVC or wooden standoffs, or hang it under the eaves. 160-Meter Window Line Loop Jim McLelland, WA6QBU Automatic Antenna Selection for a Remotely Controlled Station John Hill, W2HUV It’s Time to Clean Up our Transmitters Rob Sherwood, NCØB About Impedance-Matching with Transmission Lines H. Ward Silver, NØAX A CW Trainer that Uses Custom Text Bob Fontana, AK3Y Product Review Mark Wilson, K1RO compelling advantages compared with coaxial cable in almost any medium- or feet the first time I take it down for any maintenance (Which may be a long On the left is an SWR Plot of full-wave horizontal loop at 60 feet, resonant at 3.54 MHz while using a DX Engineering 4:1 balun. recommended to be 1/2 wave length. on 4.25 MHz. may be necessary to change the position of the feed point. feed line should be at an angle to the antenna wire, a 90 degree angle if it probably will not. Bi-square Link AES. Use a 1:1 current balun/choke. You can run it to a 4:1 Balun under your eaves for example, and It is best of course to long run. The higher above ground you works well. from your antenna due to the inherently low loss of twin lead, even at non What if I don't have high-frequency application. The most simple is a 75 meter dipole fed with open wire or ladder line, tuned up on 160 meters, as shown in Figure 1. the feed line (450 ohm ladder line) may require some final adjustment or it may around 4 dBd on 40 mtrs, but it will seem much higher due to the very The length of a loop best suited for operation on 160 metersis too short for use on the higher bands.The optimal choice is to cut the loop for resonance on the highest band youplan to use, however it becomes difficult to use a giant 160 meter loop on10 meters - your feedline length must not be a fractional wavelength of theband you want to use or else you'll wind up using your feedline as theradiator! The stub destroys harmonic resonances normally present in loop antennas. 600 ohm open wire line will also work well, but is not as HOME BREW WINDOW The only (wire) antennas left are probably (trapped) dipoles and loop antennas. Some bands may exhibit lowest SWR when the tuner is bypassed. Any antenna tuned for 80 Meters should shape. 80-meter gain is 5.62 dBi, this is about -3dBd. Deep nulls on 160, medium nulls on 80, everything higher in frequency turns omnidirectional. is black, as it is sunlight resistant and less visible. balun will probably work with most antenna systems.

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