QEX October

Always have a component along the axis of some of the dye molecules in a twisted nematic or cholesteric layer of Fig. 7 Optical properties of a pleochroic dye molecule Light is selectively absorbed, to give the colour of the dye. only when ihe electric field vector E or the incident light has a component along the transition moment, usually along the long axis, of the dye molecule More complex forms of (his anisotropy in the dye absorbance are also known Fig. 7 Optical properties of a...

Six Meters

I have been making routine contacts from Rockville, MD, by six-meter meteor-burst propagation to Ralph Wallio, W0RPK, of Indianola, IA. Thanks to the use of packet-radio techniques, these contacts have been 100 error free. Other than the use of TAPR (Tucson Amateur Packet Radio) packet-radio boards and computer terminals, conventional Amateur Radio equipment has been used. Wj RPK uses an unmodified 250-W Motorola FM base station, and a 5-element beam. My station consists of a modern all-mode...