It can be connected to the GES using a split bolt connector available at most hardware and home centers. Run the Grounding Wire from the Mast to the House Ground Wire. I inspected the wiring of my antenna with the intention of doing a write up on how it was grounded. It utilizes a 9:1 UNUN transformer in order to bring the impedance of the antenna to more manageable values for your antenna tuner. REVISION NOTE: We had a note from James, KB5YN, pointing out that one of my so-called GOOD numbers was 220 feet. Keep your antenna far away from power lines! I don't think they are necessary with a wire antenna. A random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a relation to the wavelength of the radio waves used, but is typically chosen more for convenience. install an antenna where it can contact a public utility wire. This time, the installation was in a virgin farm field. Here is a 1.8-30 MHz sweep of a 50-ft long single-wire counterpoise: This plot shows a low common mode impedance at 4.8, 14.4, and 23.8 MHz. Note that I did not write "ground", but "counterweight". 2. Grounding. If you’re attaching the grounding wire directly to the antenna mount via a bolt, make sure the wire makes direct contact with the mount (scrape off paint or coating if necessary). The SDR only has coaxial connectors, no direct wire connectors. This balun is simulated with LTSpice and measured with a VNA. Some safety notes: 1. Much has been written about the optimal length of a random wire antenna (sometimes called a long wire antenna), some of which is contradictory. It should be at least 30' long and made of multi-strand copper antenna wire supported a minimum of 15 feet off the ground. At the beginning of Radio Technology, there was little or no man made noise and reception had to cope with galactic and atmospheric noise only. There is a limit on the length of the wire connecting a cable TV co-ax shield to your house's grounding system. . The power handling has also been tested with a 50 W (SSB) of injected power without any pr… i use an insulated wire from the tuner to the point the wire takes off from the house, then galvanized steel fence wire for the rest of the run. Stealth #16 AWG XLPE black wire; Connector: Silver/Teflon SO-239 *Grounding at the transformer box or end of the coaxial cable is recommended for the protection of your equipment from an electrostatic buildup in order to prevent ESD- electrostatic discharge. NOTE: grounding does not affect antenna … That way this is nothing but a pass-through connector with an internal spark gap. Here are the final numbers (in my opinion) in green below that would be good for a long-wire antenna: (You may want to make a note of them) REVISED: 29 35.5 41 58 71 84 107 119 148 203 347 407 423. 80m: current is max at center of long wire 40m: current is min at center of long wire Capacitive reactance makes antenna shorter only on 80m not on 40m on up Capacitor becomes a short on higher bands Position juggled with compensation coil. An antenna discharge unit consists of an arc-gap (spark-gap), a fixed resistance or discharge element, or a combination, that is connected between each lead-in terminal and a grounding terminal. Low loss coax is used due to the distance between the radio and the UnUn. I used a length of copper water pipe as the earth spike. I have a 33' long sloper end-fed antenna. But if you are running a long-wire or end-fed antenna, then grounding is essential, to make the other half of the circuit. Watt Automatic antenna tuner at left and an Astron SS-30M power supply at far right. Making a four radial-wire counterpoise with 50-foot legs, we have: Out of interest, I did some "ear" and "s meter" tests and this balun ALWAYS outperformed a commercially bought toroidal long-wire balun, so it is worth the build. The earth ground runs to a 8' long copper ground bar and from there run four or five radials out to ground bars creating a ground field. This ground line is not length sensitive and can be used at any length without concern. I recommend grounding this the same place your radio chassis is grounded. For all my wire antenna projects I always use extremely flexible and comparatively cheap black-coloured 4mm²-sized tinned HO7 V-K 4 wire. It must be no more than 20 ft long, unless there is an additional ground rod (see NEC 220.100 for details), though I'm not sure if this would be the distance to your main panel, or to your ground rod. They are available from the usual sources. The UnUn is located away from the house. I have a NooElec Ham-it-up shortwave SDR receiver, and the associated 1:9 balun (with SMA connector on one side, 2 wire connectors on the other, for antenna and grounding wires). about 15-20 meter long if I use a 41 meter long antenna wire. Securely fasten the grounding wire to the side of your house using staples or other zip-screw type wire clamp suitable for the job. My low band antenna is an overall length of wire which is 86 feet long, configured as an "L" antenna. While installing a Vertical Antenna system, I decided to use the water method again. If you, your antenna or your ladder touches a power line, you could be KILLED. If your antenna is a balanced antenna, such as a half-wave center-fed dipole, then grounding the station won’t matter. The antenna is fed by low loss coax into a 9:1 UnUn. It is a 10meters piece of wire with a 9:1 toroidal transformer and a coax feed line of 25 meters Despite this long feed line I have no attenuation problem with RSP. See: Typical outside antenna installations. The grounding device utilizes a coaxial line where the ground wire is enclosed by a shield, such as RG-8 transmission line, to prevent the buildup of high voltage standing wave near the station equipment. An astute reader asked me about grounding the antenna in the comments of the review. The wire may be straight or it may be strung back and forth between trees or walls just to get enough wire into the air. Thanks KW8KW. This is an End Fed Long Wire wire antenna that will cover all bands from 160 to 6 meters, including the WARC bands, as well as 60 meters and MARS frequencies. The earth ground should also be strap. Now, as I was replacing an existing outdoor antenna, I simply hooked the antenna up to the already grounded coaxial cable coming off the roof. So if I use a 21 meter long wire, I take a 10.5 meter long counterpoise. So the long wire antenna must always be considered with two terminals: one is the antenna proper, the other is the counterweight. Nearly all US built radio receivers made from the early days to the late 1930's required an external "long wire" antenna. The device is intended for long grounding wires. The ground for the mast should be as direct and short as possible, with minimal bends, using a minimum of 10 AWG copper wire (or 17 AWG copper-clad steel or bronze wire). Here is an ARRL random wire page. antenna wire. Copper is best., bare copper wire works well and the best stuff was stranded around a steel, center support cable which helped keep it from stretching. One SPDT is used to switch the long wire to the coupler - the other way grounds the longwire. This was roughly expected, based on length. An LDG RBA-4:1 Balun, 120 foot long-wire antenna and 8-foot ground rod situated just through the wall outside serve as the current antenna system. A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6.5' for 20m). Also I used 75ohm tv-sat coax and F connectors and -- again -- despite impedance mismatch with RSP there is signal to sell. Counterpoise wire(s) close Any counterpoise should be at least 1 foot above ground running away from or perpendicular to the antenna wire. . Try to keep your ground wire runs as short as possible and avoid making 90 degree turns or bends. Shorter length counterpoise wires can be used if operation is confined to 40m or higher. EFLW-1.5K End Fed Long Wire Antenna. I want to connect a long wire antenna to the balun, to get broadband omni-directional shortwave reception. The length of the counterpoise is not critical. "I am using a heavy duty DPDT porcelain knife switch. Long Wire Antenna 1:9 Balun for 3-50 MHz (by F4HWK): Here i present the fabrication steps for a long wire balun having a transformation ratio of 1:9. Prepare the Ground Rod to Accept 14 AWG Wire Ground rods are massive. As a comparison, 4mm² corresponds to about AWG 11. a long wire and a random wire are essentially the same antenna, it is just a matter of semantics for the most part. There is no direct connection that will have any effect on the antenna, as long as this on at the near end of the coax, and not right at the antenna. A long-wire antenna receives best from the directions perpendicular to its sides. This unit One end is 25' up in a tree (isolated from the tree limb itself by an egg insulator and 4' of rope, of course) and the other end is atop a 10' pvc mast where it connects to a 9:1 unun transformer (the one sold by EARCHI). 2. A long-wire antenna works best 60 feet above electrical ground (40 to 50 feet above land surface). You may have a pair of 70-foot trees perfectly positioned to sup- port a wire beam aimed at your favorite DX area. The super antenna MS135 has made it to the list of the best wire for dipole antenna because it made of tinned copper which is a very good conductor highly flexible and gives the max RF power up to 500 watts and comes in a bundle of 135 feet long. Erect the antenna N-S to receive E-W. or so I thought. Grounding: From the ground terminal on your radio (next to the antenna terminal) run a wire to either a copper cold-water pipe (PVC pipe won’t work) or a copper ground rod driven into the ground. "HO7 V-K 4" is the European harmonisation code for this wire. Soldering wire to them is a challenge. After the antenna mast hardware and mount are securely connected, there is no issue in repainting afterwards. Grounding your equipment should take care of the shocking from your equipment. Now run the mast grounding wire to the house ground wire and attach it. 4 – Schematic of an antenna discharge unit for wire conductors. Some say that you can use a 4 meter long counterpoise down to the 40M band, but I don’t know. One terminal of the UnUn is connected to a good ground and the other to the antenna wire. With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. Grounding the balun / coax to a good earth made between 3 and 6 dB improvement with QRM, even though the station was well-grounded. Do not ground the counterpoise stud when using a counterpoise(s) or radial field. Grounding Your Antenna When Not in Use : Bill O'Neil, KW8KW recently shared his method of grounding his antenna (always a good idea) when not in use with the Smartuner User's Group. While these lengths have been shown to work well on many bands, which is helpful if you're in a hurry to get on the air, read up on the topic and experiment. The threat of rocks within eight feet of the surface was real. Antenna discharge units are voltage limitation devices (figure 4). We added the station just after attending the Dayton Hamvention in 2011. My ground system is good enough for it to work all the way up to 6 meters without RF feedback. Fig. But if a power line runs between the trees, forget it. As far as radials go.
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