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. Off-Center-Fed Full-Wave Doublet Antenna. The shortest antenna that has a chance of tuning all bands has an electrical length of 143 feet and should be trimmed to give a quarter wave resonance at 1.72 MHz. Terminated Sloper Antenna. 1.9 MHz Full-Wave Loop Antenna. If it isn't end-fed, then it's usually near-center fed and becomes a dipole antenna instead. Using a 160 meter full wave loop in that fashion is likely to be counterproductive. Since you ask for coverage from the 160 meter band and up, here's an 200 $\Omega$ SWR plot of a 266-ft long center-fed dipole in free space: The perfect opportunity is coming up February 27 during the CQ World Wide 160-Meter SSB contest. (That dipole may be cut to length on a specific frequency or it may be "however long you can make it", but it's still a dipole, not an end-fed wire.) The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes with putting up a more elaborate antenna. Another antenna added from the antenna plan is a 160 meter ¼ wavelength inverted L. A 130 foot length of 12 gauge PVC covered stranded wire slopes up from the ground system to the 40 foot level of the 45 foot tall fiberglass flagpole (about 60 feet of wire length) and then proceeds about 70 feet toward the far back edge of my property. This high impedance is impossible for most antenna tuners (matchboxes) to match. At the … I soldered my antenna wires to the connector and used tape and sealant around the coax. I used 3.5 TPI to make tapping easier and to keep the losses down, 11 turns were sufficient. If you’re squeezed for space, give this antenna a try. Once on a band, I never need to re-tune as I move up and down within that band, as the SWR reflected power stays very, very low. The most widely used formula to calculate the approximate overall length of wire required for a dipole is: 468 / frequency (MHz) = length of wire in feet. You also want the antenna to be at least 1/4 wavelength long for each band you plan to use. In practice it's best to make the antenna a little longer than the calculated value … The length of the counterpoise is not critical. The distance between one point to another adjacent point in a wave is known as the wavelength. So if I use a 21 meter long wire, I take a 10.5 meter long counterpoise. In reality, the term long wire antenna, should be replaced with the term end fed wire, unless it the antenna is many wavelengths long and a true long wire antenna. It utilizes a 9:1 UNUN transformer in order to bring the impedance of the antenna to more manageable values for your antenna tuner. Length of an impedance-matching section with 75-ohm cable with a velocity factor of 0.66 (polyethylene dielectric): Length of an impedance matching section made with 75-ohm cable with a cable velocity factor of 0.80 (foam dielectric): Formulas. It worked well in it’s only test, and will be reconstructed. The formula for calculating the approximate length of a dipole is: Dipole length in feet: 468 / frequency in MHz. Delta Loop Antenna. 40m - 80m - 160m Short Dipole Antenna. Dipole length in meters: 143 / frequency in MHz. was fascinated by the distant AM broadcast, lower shortwave, and 160-meter signals heard with long antennas. Affordable 6. My neighbor lost his … Driving a ground rod into the earth isn't the solution, since the earth is a poor conductor of RF. More coax is good in this case because its more antenna to radiate. The fewer bands, the fewer high impedance regions to avoid. The AH-4 makes everything equal. So, the antenna radiation is … AEcreative 10-160 Meter Amateur ham HF Band Radio Wire Loop Antenna Balun Unun DIY kit T200-2 Type 2 Iron Powder ferrite toroid core 16AWG Enameled Magnet Winding Wire 3.9 out of … About 160 meters long wire antenna The resource is currently listed in dxzone.com in 2 categories. 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. Some people use open wire line and feed a 80 or 40 meter loop on multiple frequencies. The graph below shows lengths to avoid for different collections of bands. I used one of the pulleys on my tower to raise the vertical section to the top of the tower, then ran the rest of the wire horizontally to the top of a tree. Length of Antenna Wire is 40,56 meter. $\begingroup$ @Phil_12d3 Usually when one talks about random-wire antennas, one talks about end-fed wire antennas. The Inverted L My 160 meter antenna is an Inverted L. The length of wire required at 1.835 MHz is approximately 127 feet. The horizontal portion carries less current and does less radiating. The greater the length of the vertical portion of the wire, the better the antenna will perform. The length of a loop best suited for operation on 160 meters is too short for use on the higher bands. AH-4 Antenna tuner wire length. The clear advantages of this antenna over other wire antennas: 1. Get the wire up as high as you can. I have what is left from my initial 2M/70CM antenna install in 2012. Some say that you can use a 4 meter long counterpoise down to the 40M band, but I don’t know. Due to the short length, this will probably continue as my only 160 meter antenna at this QTH. Double Extended Zepp Antenna. 468 ÷ freq (mHz) = Length (feet). I did learn that the wire antenna requires a counterpoise to "work against", since the height of the 160 meter antenna is so very close to the ground in a typical urban residential lot. 5. Wound at 3.5 TPI ( 3.5 turn per 25mm) Number of turns depends on the length of the antenna. EFLW-1.5K End Fed Long Wire Antenna. Unfortunatly 160 M was tough due to antenna length....I did have a long wire inverted V between 2 trees & connected to my Tuner at the shack...It was hit by lightning many moons ago & burned out the coil in my Drake 2B receiver which was easy to repair. Low SWR on all bands 4. So far received 3 votes for a total score of 3.67 Center-fed dipoles experience current nodes when the feedpoint is any even multiple of the frequency on which the length equates to an electrical half-wave. On the other hand, if the length of the feedline happens to be an odd multiple of one quarter wavelength (e.g., 1/4, 3/4, 5/4, etc.) In my experience, I normally use the half length of the antenna wire. The center loaded wire I had for 160 meters required to much maintenance, so I did not repair it after it blew down the last time… The main category is Antenna for 160 meters band that is about 160 meters band antenna. Resources listed under antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. The basic formula for determining the length of a center fed, half-wave wire Dipole or Inverted Vee antenna is:. I'd seen all sorts of recommendations Online about the length of wire for a 160-Meter loop, and none of the were 160 Meters. resonant at the bottom of the band. This link is listed in our web site directory since Sunday Mar 22 2009, and till today "160 meters long wire antenna" has been followed for a total of 5023 times.. An inverted-L antenna consists of ¼ λ of wire, shaped like an upside-down L (Fig 1). On a 9:1 end fed, the coax is an integral part of the antenna and radiates about as much as the wire. To make the antenna resonant higher up the band, just trim the length of the sloping wire.