Here's a link to the GE Ham Tips article from the 1950's about improved SG keying: https://goo.gl/photos/MK1iUqzAjmpfweTN9 73s Tom KE4RHH Sent from my iPhone -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/arc5/attachments/20161119/3d1d4324/attachment.html>