I just bought a stock Drake R-4B. Suggestions on how I should upgrade/improve this rig and how to determine what crystals and filters I need for AM reception would be appreciated. In the 1970s I had a Drake C-line station and a chart that told me what crystals I needed to install to hear WWV and foreign broadcasts.
Dave Kaiser, AL7HG Crystal River, FL 34428 www.FloridaPublishing.com
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