Hi Rob;
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You wrote, "My MIX-4 has a J309 FET properly coupled to the 5695 kHz IF tuned circuit, and separate ports on the NE602 Gilbert Cell mixer for the IF and the LO injections"
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Have you given anyone permission to reproduce the PCB's for your R-4C mods? I would love to install all of them in my 4C. The parts can be sourced but PCB's would be needed.
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Thanks
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Glenn W2BX
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