When I’m tuning around looking for a QSO and hear someone calling CQ, I’ll often type their call into QRZ.Com to see if they’ve input any biographical information about themselves. Yesterday, I heard N5IW call CQ and called up his QRZ.Com page. On it was a link to his home page, where he as a bunch of interesting stuff. The first thing that caught my eye was his Resonant Speaker project.
Using simple plastic plumbing parts, N5IW shows you how to build a tuneable resonant speaker (shown at right) for CW work. The theory is that you’re creating a cavity that’s resonant at a particular audio frequency. Audio at that frequency passes right through the cavity. Other frequencies are blocked.
I’ve seen several articles like this in ham mags over the years, but this is the first one that actually looks simple enough for me to build. Next time I’m at Home Depot, I think I’m going to pick up the parts.
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