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HF-Ground
"Cecil Moore" wrote My "Electronics Equations Handbook" gives the specifications for a "SINCLE-WIRE ABOVE-GROUND TRANSMISSION LINE" including Z0, C, L, and resistivity adjusted for frequency. ======================================= Single-wire lines - Primary Constants : The single conductor has resistance and inductance. Resistance includes radiation resistance. Space and its contents has permittivity, permeability and conductance. The 'return path' is space and whatever it contains. Secondary Constants : Phase shift and propagation velocity. Attenuation (loss). All parameters obey the classical mathematical rules of Maxwell and Heaviside. There are also, very common, 2 and 3-wire (3-phase) transmission lines which have smaller radiation resistances, but radiation resistances they DO have depending on conductor spacing. ---- Reg. |
#2
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HF-Ground
Reg Edwards wrote:
There are also, very common, 2 and 3-wire (3-phase) transmission lines which have smaller radiation resistances, but radiation resistances they DO have depending on conductor spacing. One of the ARRL Antenna Compendiums describes a 4-wire transmission line whose Z0 is selectable depending on how the wires are connected. -- 73, Cecil http://www.qsl.net/w5dxp |
#3
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HF-Ground
"Reg Edwards"
There are also, very common, 2 and 3-wire (3-phase) transmission lines which have smaller radiation resistances, but radiation resistances they DO have depending on conductor spacing. __________ Doesn't the term "radiation resistance" normally apply to a characteristic of antennas -- not transmission lines? RF |
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