Recently, we started holding "Educational Moments", as I call them (Can someone please think of a catchier name?), during our weekly net, between the roll call and the roundtable discussion -- usually about 20:15.  I'll start trying to add a little supplemental material here where appropriate.  For now, here are the topics we've done so far:

Date	Topic
2011-12-04	Harmonics / Overtones
2011-11-27	Time/Frequency Domains
2011-11-06	DC/AC, Bias
2011-10-30	Polarization
2011-10-23	Faraday Shields
2011-10-09	Atmospheric Layers
2011-10-02	Propagation Modes
2011-09-25	Frequency Ranges & bands
2011-09-18	1/2-wave antennas