Category Archives: Wes Hayward

Crystal filter analysis, SW40

I’ve been away from the blog for quite awhile, mainly because I ran into several roadblocks which stymied my progress with the SW40 build and analysis. I really wanted to re-visit the type of analysis I did when I built … Continue reading

Posted in crystal characterization, crystal filter, SW-40, TAPR VNA, Wes Hayward | Leave a comment

Colpitts confusion. Phone a friend?

I read through the analysis presented by Wes Hayward in his Radio Frequency Design book, Chapter 7.  In it he presents the above circuit used for analysis of the Colpitts.  He then proceeds to calculate an input admittance formula as … Continue reading

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Oscillating away in Colpitts country

According to Wikipedia, the Colpitts oscillator was developed by Edwin Colpitts in 1918.  I played around with this oscillator when I first started homebrewing around 2002 or so, and never could get it to oscillate for some reason!  Today, much … Continue reading

Posted in bitx20, books, Colpitts, oscillator, Wes Hayward | Leave a comment