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The G5RV antenna is a dipole with a symmetric resonant [1] feeder line, which serves as impedance matcher for a 50 Ω coax cable to the transceiver. [ 2 ] [ 3 ] Origin
SWR is used as a measure of impedance matching of a load to the characteristic impedance of a transmission line carrying radio frequency (RF) signals. This especially applies to transmission lines connecting radio transmitters and receivers with their antennas, as well as similar uses of RF cables such as cable television connections to TV receivers and distribution amplifiers.
SWR (standing wave ratio) is typically 1.5:1 or less over several octaves of frequency. [4] A discone antenna consists of three main parts: the disc , the cone , and the insulator . The disc : The disc should have an overall diameter of 0.7 times a quarter wavelength of the antenna's lowest frequency .
For example, the SWR bandwidth is typically determined by measuring the frequency range where the SWR is less than 2:1 . Another frequently used value for determining bandwidth for resonant antennas is the −3 dB return loss value, since loss due to SWR is −10·log 10 (2÷1) = −3.01000 dB.
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The G&SWR was formed in 1850 from a merger of the Glasgow, Paisley, Kilmarnock and Ayr Railway (GPK&AR) and the Glasgow, Dumfries and Carlisle Railway (GD&CR). A number of other companies were absorbed by the G&SWR or its predecessors, including the Ardrossan Railway, the Paisley and Renfrew Railway and the Kilmarnock and Troon Railway.
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A phased array antenna, is comprised of many small antennas, positioned in an array, next to each other.. Instead of sending a radio wave with one antenna, a computer system can shift the phase of the original wave, by fractions of a wavelength for each individual antenna in the array.