On Fri, Aug 29, 2014 at 9:46 AM, Fred Jensen <k6dgw at foothill.net> wrote: True ... but, spacing has always been the issue. It was solved way back in > 1949 -- check out October 1949 QST -- but for some reason, it never caught > on. > Thanks Fred. Took me a few minutes to find it. My first search turned up Silent Keys. 73, Hank, W6SX