[GreenKeys] Tuning fork looking for a home
John, W9DDD
w9ddd at tapr.org
Sun Nov 24 12:49:18 EST 2019
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What uses a 120 CPS tuning fork? I've heard of 180 and 87.5ish. -- John, W9DDD
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[GreenKeys] Tuning fork looking for a home
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