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Ham Radio

SCAF audio filter

[Today’s run: 9.11 miles]  (actually it was a bit more but my wife turned off her Garmin GPS at 9.11)

I’m on a variety of emailing lists which relate to ham radio activities.  Earlier this year a man on one of them advertised “parts” for a SCAF filter project.  At the time I had been wrestling with audio filtering needs, so this was apropos to me.

I responded.  He sent me about 5 parts and the plans from a 1986 QST magazine.  The parts he supplied were the more difficult ones to find.

I looked at the article.  Pretty cool stuff.  Eventually that article resulted in a commercial product called the SuperSCAF filter.  You can find those on ebay periodically.

Anyway, I ordered the rest of the parts from Digikey.com , laid out circuit boards, got everything installed, and here we are.  It works!  I have everything laid out on a “breadboard”.  That is easy to do because it requires no metal work and keeps everything electrically separated.  I will probably use it a bit in the current configuration.  Then I need to get a metal box and get things installed in the box.  (I’ve had more than one project go bad at the “put it in a box” stage.)

SCAF breadboard