Art Unwin wrote:

...
Very best regards
Art Unwin.......KB9MZ........xg (uk)

By-the-way, a sine wave (such as is seemingly depicted in that picture)
is nothing less than a circle (360 degrees)--"traveling." I don't
believe you were "lost" on that point, but stated here just to make sure
.... or, simply, "a traveling circle."

Regards,
JS