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#11
July 8th 15, 07:14 PM
posted to rec.radio.amateur.antenna
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An antenna question--43 ft vertical
John S wrote:
On 7/7/2015 1:44 PM, wrote: Ian Jackson wrote: In message , Jerry Stuckle writes Sure, there is ALWAYS VSWR. It may be 1:1, but it's always there. If there's no reflection, there can be no standing wave. So, being pedantic, there's no such thing as an SWR of 1:1! Despite the name, VSWR is defined in terms of complex impedances and wavelengths, not "waves" of any kind. Actually, VSWR is defined as the ratio of Vmax/Vmin. Actually, VSWR can be defined several ways, one of which is: (1 + |r|)/(1 - |r|) Where r is the reflection coefficient which can be defined a: (Zl - Zo)/(Zl + Zo) Where Zl is the complex load impedance and Zo is the complex source impedance. Note that a complex impedance has a frequency dependant part. -- Jim Pennino |
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