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Before going any further, you should read our all-inclusive yet ever-expanding Disclaimer. If you read anything below this paragraph, you are assumed to have read the disclaimer and agreed with its terms. (That's another disclaimer.)
The Macbeth Color Checker:
The Macbeth Color Checker is a tool for serious photographers and film developers. It provides a set of known reference colors which can be used as a setup and adjustment standard in film and video production.
The Beverage Antenna Memorandum of 1958:
This is a page about an obscure FCC memorandum about the construction and testing of Beverage antennas for reception of distant AM radio stations.New! The Wave Antenna:
This is an excerpt from "Radio Antenna Engineering," First Edition, by Edmund A. Laport. The "wave antenna" is another name for the Beverage antenna.The No-Frills Technical Links Page:
This is one of the most frequently visited pages on this web site. It is a big bunch of technical links without a lot of fanfare or decoration. Lots of material about GPS, time and frequency, benchmarks and other standards, antennas, Morse Code, and other cool technical topics. This page is sure to expand rapidly, which is both the cause and the effect of being written a no frills format.The EBS Authenticator Word List:
Years ago, the Emergency Broadcast System relied upon this list of passwords to authenticate a national emergency warning. Broadcast historians, as well as those of you who study the Cold War and Civil Defense, might find this interesting. Recently expanded to include other documents about the EBS system.The Last Empty Channel:
The story of TV Channel 37, on which there are no stations, even though the other channels are becoming more crowded and more lucrative every day. It is ostensibly reserved for radio-astronomy, although there are rumors that the channel is used for covert communications, since it is a band that no Radio Shack scanner covers.Deleted files can be recovered:
Few people know that deleted files are not erased -- the data is just hidden, and the files can be undeleted. Still fewer people know how to undelete files, either to recover from accidental deletion or to "go fishing" for interesting data.Feeding 20 mA to a long string of LEDs:
On this page I describe the technique I used to drive a long string of series-connected super-bright LEDs. The use of a current limiter makes the system much more resistant to failure.Old pictures from KRLD-TV:
If you like broadcast history, take a look at some of these old photos, including pictures showing the arrival of the first videotape machines at the station in about 1960.The 216 Browser-Safe Colors:
Your monitor may be able to display millions of colors, but there is a relatively small set of 216 colors which are accurately reproduced on any web browser. These are sometimes called the 216 Browser-Safe Colors, also known as the Safety Colors. And as it turns out, there are other semi-standard colors which all browsers seem to recognize by name.In Search of ARL5:
My field trip to the Arlington Continuously Operating Reference Station, which is a super-accurate benchmark.Speaking of benchmarks...
This is a hobby in which people hunt for survey markers, usually a brass disk embedded in the sidewalk or the side of a building. But reference marks can also include radio towers, water towers or church steeples. What could be more fun?My trip to the Loran-C station in Raymondville:
There is only one Loran-C station in Texas, and it's located in Raymondville, down in the southern tip of the state. I dropped in one day in 1984 and took some pictures. Don't try that today! The security is probably much tighter and the guys probably aren't as friendly to strangers with cameras, in these days of terror alerts and such.A Brief Explanation of Cookies:
A cookie is a small data file that certain web sites write to your hard drive when you visit them. A cookie is a simple piece of text. It is not a program or a plug-in. It cannot be used as a virus, and it cannot access your hard drive or read cookie files created by other sites, although that technology is probably under development.My trip to the 72nd Floor:
The top floor of the tallest building in Dallas contains a very important radio communications hub and has a spectacular view of the city, even on a hazy day.RFID:
Radio Frequency Identification Technology and its impact on privacy.Toll Road RFID Tags
... and license plate readers, microwave sensors and other technology in use on the nation's highways.
AE5D is not a "vanity" callsign. It was sequentially assigned in 1978. My previous callsign was WB5APW.
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This page was updated May 20, 2015.|
©2015 by Andrew K. Dart