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20 August, 2014

Digital Signal Processing

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The Norwegian-language " The road to the international radio amateur license " came off the press this June. It is based on the ...
15 August, 2014

New gadget measures negative resistance

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If you are like me, you appreciate electronic gadgets with dials and displays. So when I discovered this "USB detector",  I thou...
4 comments:
07 August, 2014

WSPR on 5 bands

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For the first time ever I have been spotted on all the five bands that my Ultimate3 QRSS/WSPR kit (G0UPL design) is transmitting on. This i...
02 August, 2014

Nice radio-related stamp

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A few weeks ago I had one of my rare visits to the post office. As I was waiting, I saw a display of a new series of stamps and I just had...
3 comments:
20 June, 2014

Disappointment with Spice and the QRP-er's favorite, the LM386

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The trusty old LM386 audio amplifier from the 70's is still used a lot in low power and portable equipment. Recently some ultra high gai...
30 May, 2014

Temperature compensation for an Arduino ultrasonic distance sensor

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161.3 cm 27.0°  347.7 m/s Ultrasonic distance sensors can find the range out to 2-4 meters and are popular in e.g. robotics. Here...
3 comments:
19 May, 2014

Nice, watery CW signals from Alaska

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 Great circle path between Anchorage and Oslo Here's what a transpolar signal sounds like ( click here to listen ) and looks like (b...
1 comment:
03 May, 2014

Practical Wireless with the LM386 unleashed

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"Improving the LM386 Audio Amplifier"  is the title of always inspiring Rev. George Dobbs G3RJV's column in this month...