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24 April, 2012

Incredible projects based on 7400 logic

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Last fall there was a competition at DangerousPrototypes with many interesting entries based on the 7400 logic gate family. The ancestr...
22 April, 2012

Simple IKEA transmit indicator

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IKEA Oleby automatic wardrobe light with passive infrared sensor upper right and four LEDs in the center. Passive Infrared (PIR) detect...
9 comments:
09 April, 2012

Whatever happened to the 1 Volt QRP Transceivers?

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Output stage of the 1 Volt DL2AVH transmitter (from http://www.lichtnetzwerk.de/1volttxvr_dkumentation.pdf ) I am intrigued by minimali...
10 comments:
03 April, 2012

A history lesson from call signs

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World empires and colonies in 1914, also at the time of the 1. Int. Radiotelegraphic Convention. Source  Wikipedia Commons , user  Andr...
3 comments:
04 January, 2012

CQ DX Marathon and 2011 Activity

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I just submitted data for all my radio contacts for 2011 to CQ DX Marathon . My log program is UcxLog by DL7UCX and I started by exporting ...
1 comment:
08 December, 2011

All I want for Christmas is a nerdy watch

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As a self appointed nerd I have a special fascination for watches with binary displays or with morse code readouts. It seems as if such wa...
4 comments:
06 November, 2011

Multiple 28 MHz propagation paths and excellent conditions

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Final 'F' in UA3MIF. Notice echoes of final dot marked by arrows. Press image to enlarge. There were excellent conditions durin...
2 comments:
29 September, 2011

Communication with vector potential waves

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Field lines (black) and potential (red) for a dipole, static field.  In QEX July/August 2011 Robert K. Zimmerman (NP4B, VE3RKZ) had an ...
4 comments: