Padraigh wrote:
Is there, out there (preferably on the Net) any place I can acquire
plans/ schematic for a memory CW keyer to operate with a Radio Shack
HTX-100 xcvr as a 10-meter beacon?

Hiya and sorry to be a bit late to respond. I offer a keyer that will
work great for your application; in fact, there is at least one 10M
beacon that I know of using it (WJ5O). Two messages, message chaining,
beacon mode with delay from 0 to 99 seconds, nonvolatile memory, all the
good stuff. http://www.hamgadgets.com.

73,
Dale - N0XAS