Since I cannot get on the air as much as I would like, I thought it would be good to practice sending with a key using a practice oscillator while on my commute. Every day, I ride a Washington State Ferry to Seattle and that gives me plenty of quiet time every day but not a lot of operating time on HF. To prevent being pummeled to death with my Iambic key by my carpool buddies, I wanted a CPO that had decent sound through headphones. I asked what device should I use on the QRP-L mailing list and received some great replies. As it turns out, Jackson Harbor Press has a kit that fits the bill exactly. The Shaped CPO kit was an easy build, has headphone output, and decent sound. The CPO kit proved simple to build and would work well as a beginner’s second or third project.
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