Hi, all.

        Spark generators and rotary devices, interesting! 

        On a milder level, before solid state, didn't the olde NDBs in the
U.S. use a code wheel to key the transmitter for one of the sets of towers?
As I remember reading about them they had notches on the perimeter of the
wheel and rolled against a micro-switch.

        I think I saw a list of available IDers a few weeks ago and it got
away from me. If you would please, resend it.


TNX ES 73

Doc.
KØHTF and long wave "D"