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ZachTek WSPR TX Mini Build Instruction page 15

Low pass filter

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Connect the antenna output to your oscilloscope using a SMA to BNC cable or use the standard probe on the
oscilloscope as the picture below shows.
Check the oscilloscope; you should see a nice sinus curve with about 3.3V Peak-to-peak value at the frequency
you have set.
There is some small amount of loss in the filter so the peak voltage will probably be slightly less; in the picture
below it is 3.24V - that is a very good result.
Document version 1.1
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