Swinging to the oldest technology of radio, coincident with the announcement that telegrams no longer handled by Western Union, PaulNA5N wrote a nice historical article on telegraphy and early wireless messaging. It's available on the El Defensor Chieftain's Web site at http://www.dchieftain.com/news/59586-03-04-06.html (Thanks, Bob KI0G)
Free tutorials and info on a wide range of radio and electronics at http://www.radio-electronics.com
Would you like to learn more about radio contesting? Try http://www.arrl.org/contests and http://www.ncjweb.com
Want to get started with EchoLink? http://www.wx1der.com/elk.htm
From the Experts-Exchange (http://www.experts-exchange.com) March15th newsletter - Maybe this is what's wrong with TV weathermen: A new piece of software can tell the difference between colors. Developed by a colorblind electrical engineer, the software not only helps people who have difficulty distinguishing between colors, but also "helps normally-sighted users work more efficiently with complex color-based data representation." There's a beta-download at http://www.colorhelper.com.
When building a new gadget, sometimes you can't get ICs in anything but SMT (surface-mount) packages. When that happens, you'll need special boards to hold the chips or adapt them to convention through-hole boards. Nick WA5BDU likes the SMT proto boards from Futurlec. http://www.futurlec.com/SMD_Adapters.shtml. The "Surfboard" adapter boards and similar items from
Capital Advanced Technologies (http://capitaladvanced.com/products.htm) are available from Digi-Key (http://www.digi-key.com) and ham vendor FAR Circuits (http://www.farcircuits.net) has some similar boards as well.
For those of you that have been stuck in "Phone Tree Purgatory", Tim K3HX contributes this handy site: http://www.gethuman.com. The site has a long list of companies and methods of bypassing the usual phone follies to go straight to a live operator. You can also report your own discoveries and rate companies.
If you have RF noise entering your house (and shack) and being re-radiated on the power lines, Tom W8JI observes that it may be possible to "detune" the lines and stop the re-radiation. "I built a bypass capacitor with two 120VAC rated .01uF capacitors, each one tied from one side of the line to the safety ground, into a plug. I just moved that plug around to different outlets until I found one that detuned the power lines, and made the noise radiating from the lines in my house disappear. The noise virtually vanished even though I'm positive the source of noise several hundred feet away still remained." Make sure you use line-rated capacitors!
Here's an excellent on-line resource on microwave antennas - Paul Wade W1GHZ's online Microwave Antenna Book at http://www.qsl.net/n1bwt/contents.htm. (Thanks, Dave AD6A)
When you are looking for a particular IC, you can browse site after site looking for it or you can try http://www.findchips.com. FindChips will retrieve pricing and availability from several on-line vendors, making your shopping a whole lot easier.
73 W6IGK Elmer