After I found that Rob's Product Detector could help an R-4B, and heard that it was ok with him to make the kit ourselves, I re-designed
Rob's board except using SMD.? My board is therefore smaller that Rob's and used then currently available parts.? I batched up like a gillion
boards onto the cheap 4x4inch board specials in China.? For $6 I got a lifetime supply so I sent them out to anyone on this group that
wanted one or two.
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I could give the complete Kicad project or just the needed gerbers to someone who would do another batch.? The Product Detector Kicad
project could be easily modified by adding the J-309 buffer to make the Mix-4 board too.
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My R-4B install doc is in the Files area, somewhat easier install than Rob's since I cut one small trace and left all the Drake parts in place.
Easier if you ever want to go back to stock too.
73,
Gary
WB6OGD
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Gary WB6OGD