Finally got this working well.? First, I installed a 7 pin DIN connector in place of the 4 pin Accessory connector on the rear of the R4C.? I connected the INJ jack to this connector using a piece of RG-62 low capacity coax inside the rear of the chassis.? Next I replaced the small diameter coax I was using to feed the counter with a piece of RG-62 (about 18" long) running from the DIN connector to the counter.? The counter is now perfectly stable and accurate on all the bands, including the 28.5 - 29.0 section of 10 meters.? If the transistors ever get here, I'll add the buffer amp inside the counter enclosure.
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Anyone interested in doing this mod with the counter in an external enclosure: The chassis mount DIN connector fits the holes left by removing the accessory socket, provided you use 4-40 screws instead of the original 6-32s.? Working with the rather stiff RG-62 is a pain and you may be able to use more flexible smaller coax if you add the buffer amp to the counter that was mentioned in a previous post.? Thanks to all for the comments to my original post.
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73, Floyd - K8AC
Floyd - K8AC