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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...
24 April, 2014

Pulled out my dummy load tonight

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Press image for a better view of the dummy load Testing a transmitter means the use of a dummy load. Trying to be considerate, I don...
06 April, 2014

Bletchley Park, Enigma, and GB3RS

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Enigma (Photo: R. Holm) Bletchley Park, northwest of London (between Oxford and Cambridge), is one of the best known British sites from ...
1 comment:
27 March, 2014

I think we have a pile-up ...

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TX6G on the Austral Islands of French Polynesia is calling for EU stations on 14026 kHz CW. I hear him well at level S7, but the pile-up s...
26 March, 2014

Fantastic Conditions on 10 and 12 m

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This last month has seen some of the most fantastic conditions I have ever experienced. Especially the higher bands have given world wide c...