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Jeff wrote:
Can you measure VSWR on a 1 meter long Lecher line at 1 MHz? VSWR is not meaningful in such a situation, however, you can measure return loss and Reflection Coefficient etc.. Of course that in not to say that VSWR is not used in situations where it is not appropriate in order to indicate how good a match is, when RL or Reflection Coefficient would be more appropriate. Jeff Jeff Are you trying to say that VSWR is not meaningfull at 160M (to put it in an Amateur context)? For those that don't know, a Lecher wire is just a carefully contructed, rigid parallel transmission line upon which one would slide a high impedance sensor to find voltage minimum, maximum, and where they occured. That and a Smith chart were used to solve transmission line and impedance matching problems and were often home built by Amateurs in the early VHF days. Today you would use a VNA (Vector Network Analyzer). -- Jim Pennino |
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