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A comment on Serial Port SDR. Parent comment

Re:Serial Port SDR by wglb on Thursday December 06, 2018 @10:27AM (#18618742)
Multiples of 1/4 wavelengths, and if built properly 5/8 wave.
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Re:Serial Port SDR by naikrovek on Thursday December 06, 2018 @04:04PM (#18622219)
... but 5/8 isn't a multiple of 1/4, Or is that not what you meant?
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Re:Serial Port SDR by wglb on Thursday December 06, 2018 @04:09PM (#18622263)
Right. I should have added more detail. Multiples of 1/8 also work.

Now, you can actually make almost any length work with proper tuning circuitry, but the ones mentioned are the most effective.

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