Gregory's Serverthe resulting transmit power was 200 kilowatts! even by modern standards this is very high power. in the United States, the most powerful AM stations were only a bit more than twice as powerful.
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@cr1901 @tubetime I remember back in the late 80s my Telecom Australia apprentice intake went to this AM broadcasting station and antenna https://maps.app.goo.gl/EM6Luyo98ve2NUeB9  and if you can't make it out to Sweden, there are virtual tours available: https://alexander.n.se/en/virtual-visit-to-saq-grimeton/ for further reading, here's a useful paper. https://www.navy-radio.com/xmtrs/vlf/alexanderson-mayes-1975.pdf  @tubetime OMG it runs off 2-phase because it's from a very particular time and place in the US. @tubetime OMG the air-quenched relays are scary, and they're just right out there. @tubetime Thanks for posting this; on my list for my next visit to Scandinavia. @tubetime apparently someone made a modern receiver out of relatively equivalent-level technology http://www.wireless.org.uk/mechrx.htm  @tubetime  There are 400 kW AM transmitters now that are completely solid-state, no tubes even. https://www.nautel.com/content/user_files/2020/01/NX400-spec-sheet.pdf  @tubetime (and those 500 kW AM stations only operated on an experimental basis; none were ever licensed for commercial broadcasting, because small radio operators had powerful friends in Congress and they worried that they would lose their audience and network contracts if the networks could cover the entire country with just the six stations they owned) |
@tubetime I thought even at 100 kW, you start getting spooky effects like nearby metal fences having an appreciable voltage :D!