Skip, make sure the aftermarket cable has the jumpers between DSR/DTR and RTS/CLS on the computer end. Some Kenwood programs check for this before it will let you program and some of the aftermarket builders didn't know this so it worked on one model but not another. So far I have programmed several different models of portables and mobiles including the 809 and 349, all with the same homemade KPG4 adapter and a bunch of homemade adapter cables. Mine uses the MAX232 chip but as I recall Kenwood used the LT1081cn, same chip, different manufacturer. If the aftermarket uses discrete components I would guess "you takes your chances".
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