More spark today. I really liked how Robert Dalby demonstrated spark transmission and reception. He used a simple Piezoelectric flame starter (like the one that many of us have in our shacks) as the transmitter, with a homebrew coherer connected to an LED and some batteries as the receiver. Ingenious. As with CuriousMarcs video of yesterday, you can see how Marconi's system really worked. Brilliant.
This demo also shows how many devices can generate part of the noise we hear in our receivers. We see and hear the noise generated by a nearby electric fence, and the noise made by a simple electric motor. Many new builders have trouble accepting the reality of noise. Noise happens.
The entire YouTube channel is very interesting. Check it out here:
It is based on the amazing collection of Dieter Beikirch (I think he is DJ5RS) and is presented by Robert Dalby. Here is how they describe the channel:
German avionics in the era of the vacuum tube.
Join us as we investigate the most critical period in the rapid development of electronics, especially airborne electronics, from the first spark-gap radios of WW1 to the advances in radar technology in WW2.
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