Tuesday, February 16, 2016

More WSPR filter planning

Following up on my previous post.  I found another filter planning page - wa4dsy.net.  For this one, I put in data for a Lowpass filter, cutting off at 14MHZ.  It gave some plots of results.  I liked the Chebyshev plot the best.











Note, that the loss at 13.50mhz is only 0.2db.  The other plots showed 0.7.   Comparing the results to the calculatoredge.com page I found they were fairly similar.  Looking at inexpensive components on digi-key, I made the following comparison and decisions:


Calculator Calculatoredge.com wa4dsy.com Plan
14 MHZ



L1
830nH
705nH
1.0uH
C1
299pF
253pF
270pF
C2
299pF
253pF
270pF


All of these components are available in 0603 package, and pretty cheap on DK.

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