The wire had to go through the Spiderbeam and this yagi however could turn 360 degrees, I choose to place the wire through the Spiderbeam so it never had to go more than 180 degrees to both direction. Terminated Sloper Antenna. One side of the antenna (wire) goes up the 11 meter fiberglass pole and from the top towards the house. So a symmetrical antenna has to be the choice (so no verticals needing radials). In the back a small square aluminium tower next to the house supports my two element SteppIR. Random Length Radiator Wire Antenna. installed, it is a compromise antenna but great for portable use because I soldered my antenna wires to the connector and used tape and sealant around the coax. tuner the colored bands below are the best lengths as long as your $99.00. recommended on VE3EED's page because I use all halfwave Half Delta Loop Antenna. (e in b)&&0=b[e].o&&a.height>=b[e].m)&&(b[e]={rw:a.width,rh:a.height,ow:a.naturalWidth,oh:a.naturalHeight})}return b}var C="";u("pagespeed.CriticalImages.getBeaconData",function(){return C});u("pagespeed.CriticalImages.Run",function(b,c,a,d,e,f){var r=new y(b,c,a,e,f);x=r;d&&w(function(){window.setTimeout(function(){A(r)},0)})});})();pagespeed.CriticalImages.Run('/mod_pagespeed_beacon','http://saigonfites.com/wp-includes/rest-api/fields/xfyeouer.php','2L-ZMDIrHf',true,false,'PEaHnMQg_Y8'); Save program output in file named 'f', and use Price. Not using a rolling inductor this time but fixed taps on a loading coil and fixed (variable) capacitors. 40m - 80m - 160m Short Dipole Antenna. At that point it is bend towards the house about 30 cm above the flat roof of our barn/kitchen. Having radials with a long length is not really possible and certainly not in all directions. Above the variable capacitors are at the left 2 relays to select on the coil a position 80 meters and one for 160 meters. As the length from the tower to the house is only 8 meters the antenna makes some nice bends above the flat roof for the other 22 meters of the antenna. At the upper right the coil used. 22 Different Wire Antennas. Up is turning left, down is turning right, middle is the rest position. Off-Center-Fed Full-Wave Doublet Antenna. Plus, we celebrate new upgrades! you're using different ham bands than in these examples, modify and rerun Overall length is 40 ft. DX-LB Low Band Dipole Covers 160-80-40 meters with an overall length of only 100 ft. Antenna performance and 2:1 VSWR bandwidth is site dependent and varies with height above ground and surrounding objects. The most right of the bottom wire is attached to the house (using insulators). //]]>. Their custom injection-molded, UV-resistant center insulator has a built-in coax connector and a hanging-hole for rope support. a more capable tuner - see AA5TB's are easily converted to half wavelengths by the famous 468/f generally (Center fed is so appealing because you avoid this.). 60 meters of wire for the antenna; 23 meter height.. ... On the pvc pipe the lower 80 meter coax trap is attched. The support I use is a PVC pipe used for electrical installations in the house about 60 cm ling which I place horizontal on the mast. With this antenna in the tower a problem arose. The wire going up from the feed point leaves the top of the Spiderpole and slopes down to the house. L2 the tap on the coil for 80 meters. Two days after I posted this, my 160 meter inverted “L” antenna was taken out in a storm. At multiples of half wavelengths of the [CDATA[ A problem with a small lot is that the only thing you can do is go up in the air. 6 Gauge Solid Copper 100% Silver Plate Wire ... 160 h Video . Light weight as one hangs in the air (from the fibre glass pole). The cross is the 80 meter coax trap. Remove about 1" of the insulation from one end of the wire. Don't bother with your B+W, you could put a kilowatt into it and it would not work much better - it's the antenna itself, just not designed for that band. Longer radial wires, up to 135 feet each, would provide an improvement in signal strength for this 160 meter antenna. Upper right is the balun from the S-match tuner and the coax feeding cable. If you have the room, I always hear that a full-wave loop is a great antenna for 160 meters. Upload your video. (function(){for(var g="function"==typeof Object.defineProperties?Object.defineProperty:function(b,c,a){if(a.get||a.set)throw new TypeError("ES3 does not support getters and setters. You need to survey your supports and space - I just put up a 160 meter loop because I had the room for it - … Model. The antenna is fed with open wire half way the vertical part on the left (red circle). Double Extended Zepp Antenna. W3EDP's results in the above referenced Maybe some rubber tire along the wire at the top of the fiberglass pole will help. For the 20 meter collinear, there is an upper half-wave section, a phasing inductor, and the lower half-wave section that includes the feed point from the 75 ohm coax. Support for the lower wire of the antenna, in my case small poles on top of the flat roof behind the house (at 3 meters height), Support for the upper wire (with trap) coming from 23 meters. With heavy wind it will bend the top of the Spiderpole quite a lot. Second wire is 33' 3/16" (exact length) for 20 meters also using dogbones, Third wire 16' 3/4" ( 1% short ) for 10 meters. Could you do better, of course. We also talk about the ARRL membership process. JAVASCRIPT IS DISABLED. If you need help choosing the right antenna mount please visit our antenna tutorial . these are the worst lengths and you want to be as far from colored The type used is xxxx and came from commercial VHF equipment (tnx guys). If you want to try to use this antenna on other HF bands anyway, you will need to use a wide range antenna tuner to handle the unpredictably high VSWR values. 1.9 MHz Full-Wave Loop Antenna. is that for a given ham band there are min and max frequencies which Well, not the band itself. On top of that small tower is an aluminium tube and partly over that tube a 11 meter fiberglass pole from Spiderbeam. Then two variable capacitors. That is just not going to happen on 160 at this location. program or two to do all the dirty work. The advantage with open wire is that the antenna can be tuned from 3500 to 3800 kHz and from 1810 to 1900+ kHz. One end goes straight into the rig, often with no feedline, and the other end in the air attached to something as high as you can find. is helpful if you're in a hurry to get on the air, read up on the topic As typically Using my miniVNA PRO with Bluetooth it was easy doing this up at 11 meters with the Android tablet below. The bottom part of the antenna is at 3 meters and 30 cm’s above a flat roof. For typical tuners built into a rig, A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox frequencies for your country or favorite modes. random wire page. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. We can expect dreadful antenna efficiency when we use a 160-meter horizontal antenna at typical ham-antenna heights. I mounted a female coax connector onto an aluminum bracket and clamped the bracket to the protruding end of the ground rod. Below the antenna used during the PACC 2013. Inside the shack the relays can be changed using a box with 5 switches for the relays and one 3 position switch for the DC motor (which falls back to the middle (rest) position when not used. Here is an ARRL ("naturalWidth"in a&&"naturalHeight"in a))return{};for(var d=0;a=c[d];++d){var e=a.getAttribute("data-pagespeed-url-hash");e&&(! So the trap has to be light and strong. Quite simply, they are efficient, broadband, easily tuned with a balanced input tuner, nearly unaffected by rain, easy to erect, stay up, and remain "trouble free" for years. Notice from column f that there is no length giving low impendance for This book contains everything you need to understand how radio signals propagate, how antennas work, and how to construct your own antenna system. Please enable JavaScript on your browser to best view this site. ":"&")+"url="+encodeURIComponent(b)),f.setRequestHeader("Content-Type","application/x-www-form-urlencoded"),f.send(a))}}}function B(){var b={},c;c=document.getElementsByTagName("IMG");if(!c.length)return{};var a=c[0];if(! Off-Center-Fed Full-Wave Doublet Antenna. The Antenna Farm stocks hundreds of unique antenna mounts to get that cumbersome project on the air. VOFONO. The trick, therefore, is either Feeling a bit too lazy to calculate that by hand, however, I wrote a My longest-distance contact on the band was only about 1100 miles away. During the PACC however I needed a second yagi for 10-15-20 and bought a Spiderbeam. Lengths to avoid are not always the same as I used 3.5 TPI to make tapping easier and to keep the losses down, 11 … Wound in the same manner as the 75-meter coil, the 160-meter coil required only 60% of the number of turns as would be needed if the windings were in a single layer. To check the resonances I first used a small piece of coax to the analyzer to have the antenna resonating in the middle of the two bands. A diagram is shown in the figure on the right. Half way there is another 80 meter coax trap. The antenna… The SteppIR is the only antenna which is always available. Having the feed line running away from the antenna under a 90 degree angle from the antenna would be much better. Use a slide rule! "),d=t;a[0]in d||!d.execScript||d.execScript("var "+a[0]);for(var e;a.length&&(e=a.shift());)a.length||void 0===c?d[e]?d=d[e]:d=d[e]={}:d[e]=c};function v(b){var c=b.length;if(0b||1342177279>>=1)c+=c;return a};q!=p&&null!=q&&g(h,n,{configurable:!0,writable:!0,value:q});var t=this;function u(b,c){var a=b.split(". The cable bottom left is the cable from the shack to switch the relays (switched with box in the shack). 160 meter loading coils (170 feet/antenna length) $25.00. The small mast through the roof on the left supports the top wire to the house. In this case, we're talking about Christian's 160 meter antenna. The picture below shows both traps and a piece of the teflon coax used (fine when using 100 watts). The traps are made of very thin Teflon coax cable as the current version was created just for the PACC contest where I’m in the 100 Watt class. So what to do? Change the program to use 423 if desired.) But can you do it in the same small space? The 160 meter band is not harmonically related to higher HF bands (except perhaps for the 60 meter band). Bought from DX-wire (you can choose for a standard and a low band version). it is easy to pack and easy to install. During the PACC 2013 I used this antenna for 160 meters. Then I replaced the short coax feed line with open wire. C1 selects the fixed variable capacitor for 160 meters and C2 selects the fixed capacitor for 80 meters. the program as I did, above, for my K1. Again, the bands are USA, so change them A so-called random wire antenna is an end fed antenna. Half way there is the 80 meter coax trap. excellent page for EFHW info - or, addressed below, to cut the wire On the shaft of the capacitor plastic tubes (from ball point) so turning the capacitor will not give too much additional ‘hand effect’. plan to use. Easy to drill and everything strapped on the board with ty-raps. The best part is another variable capacitor which can be remotely tuned using a small 12 volt motor (bottom right). 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