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This is a request to any readers of r.r.a.a who are
capable of performing the experiment that I performed. Use the EXCEL file at: http://www.w5dxp.com/CoilZ0VF.xls to estimate the Z0 of your test coil. If the test entry is greater than 1.0, try another coil. Here is the test setup using a 75m Texas Bugcatcher coil: http://www.w5dxp.com/coiltest.gif Using a 50 ohm source, install an autotransformer to achieve the Z0 of the test coil on its output. Load the test coil with a non-inductive resistance equal to its Z0 value. This will ensure that most of the current flowing through the coil is traveling-wave current and not standing-wave current. Report the phase shift through the test coil. This is an easy test to do. Of course, none of the resident gurus will run the test or report the results if they do run the test because it will prove their old wives' tale to be wrong. -- 73, Cecil http://www.w5dxp.com |
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