I have an old K3 that came with the pre-stiffener plate synthesizer.  I discovered the microphonic issue ten years ago and my radio was the first to get the stiffener plate mod.  So, it's old.

I also have a K3S so the old radio is a spare.  For some silly reason after all of these years I decided to upgrade the synthesizer and just did it last week.  I haven't evaluated it on the air but listening to a clean signal source I didn't notice this huge difference everyone else is excited about.  But at my age I'm not easily excited.  YMMV.

Wes  N7WS


On 6/27/2018 6:03 AM, hawley, charles j jr wrote:
I decided to bypass the replacement of the synthesizers. Could you describe the 
“huge” difference?

Chuck Jack
KE9UW


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