Magnetic Long Wire UnUn 9:1 These are usually called a Magnetic Longwire Balun. Its really an impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input. I have heard them called an UnUn which seems more appropriate. I almost bought one of these for around £30, but then decided to make one. since I,bought my grundig,from amazon ,on here its a,new 750 satiliit,the antenna with the 750,is a very good antenna,but this Usmile external,long wire is a,world of difference better,in receving sw.and ham bands too,and aircraft also,i recommend this ,long wire antenna to any one who may have a, sw radio be it a, Grundig, 750,-800 milinium or ... Crainer hoaxmc
Long-wire antennas and arrays ultimately rest on the basic performance properties of a single end-fed long wire. Different sources use different expressions for the threshold of when an antenna becomes a long-wire antenna. Some treat all wires at least 1 λ long as long wires. Other sources leave the Balun and Core Selection: (mostly receiving) Contains information on core selection for transformers and baluns (it isn't a balum) Balun, sleeve baluns: How a sleeve balun works and what is important. Balun, transmitting: Testing transmitting baluns and untrue folklore about choke, voltage, and current baluns. Dispelling myth that grabbing coax ...
Aug 12, 2016 · You can’t, for example, generally use a 40m EFHW antenna on 20m. End-fed wire antennas are a different beast. They are not a half-wavelength long, meaning that, if you choose the length of the radiator wisely, the impedance at the end of the wire will not be as high as the impedance of a half wavelength long wire. Remember what we said about any length of wire or rod antenna acting as an aerial as long as you can match its end-impedance to the tuning circuits in the radio? This is what the portables have done for years. The telescopic whip and the impedance transforming electronics form the basis of The Active Antenna.
820 00138 a vinafixDominion community solar rfpThe WiNRADiO WR-LWA-0130 Long Wire Antenna Adapter is designed to work on medium and short wave bands, covering a frequency range from 0.1 to 30 MHz. It is especially suitable for use with WiNRADiO shortwave receivers, such as the WR-G31DDC, WR-G303i, WR-G303e, WR-G313i and WR-G313e receivers. What type of wire is best to use with the Balun One Nine? In terms of antenna performance, the gauge of the wire will not make a difference. The most important factor will be the length of wire, which will differ depending on the signal frequency that you are trying to capture. What are the frequency ranges for the antennas in the RaTLSnake bundle? Long wire antenna with 4:1 balun It wouldn't exactly be horizontal all the way but it would be easy to feed with probably 50 feet of coax. Doing a dipole would require longer feed line.
Recommended wire lengths and Installation Notes for Unun models 4932, 4935, 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. SWR will vary based on topography, proximity of nearby structures, configuration of the antenna wire and choice of ground or counterpoise. The purpose of a balun. From: John Doty ([email protected]) Date: August 24, 1995 Original source: Usenet's rec.radio.shortwave The purpose of a balun is to block common mode waves (current flowing in the same direction on both conductors of a transmission line) and pass differential mode waves (current flowing in opposite directions on the conductors).