"rickman" wrote in message
...
The magnitude DEPENDS on the frequency dependant parts.


But the ratio of Vmax/Vmin does not.

Huh? I'm pretty sure the VSWR is a function of frequency. A great deal
about the impedances *and* the voltages change with frequency.
--

Rick

The SWR is measured at a fixed frequency , so the formular is frequency
independant. Each time you change frequencies , the SWR will usually
change.

I guess that it all depends on how you look at it. You can use a sweep
generator and spectrum analizer to get a SWR curve over a frequency range.
If you feed a dummy load of pure resistance, it will not mater what
frequency you use, the swr will stay the same. If the load has an
impedance that is not constant at all frequencies, then the swr will change
as the frequency changes.