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2 Meter Hybrid Ring to BPBR Duplexer conversion

This documents my adventure in converting a noisy Sinclair Hybrid Ring VHF Duplexer to a more reliable BPBR type. The modifications are primarily to add a series capacitor to the coupling loops and change the cabling harness. While I had it in my garage, I also did a tear down of the cavity resonators and cleaned the sliding resonator rods and contact fingers.