Many thanks to SWLing Post contributor, Charlie (W4MEC), who shares this fascinating film which documents the production and calibration of crystals in 1943. I had no idea of the amount of labor and attention to detail this process required–an absolutely fascinating process:
Alexanderson alternator in the SAQ Grimeton VLF transmitter.
Sweden’s Alexanderson alternator station SAQ has planned a Christmas Eve transmission on 17.2 kHz. The transmitter will be tuned up starting at around 0730 UTC, and a message will be transmitted at 0800 UTC. The 200 kW Alexanderson alternator is an electromechanical transmitter dating back to 1924.
The event will be streamed live on the Alexanderson site YouTube Channel. Listener reports are invited via email or direct to Radiostationen Grimeton 72, SE-432 98 Grimeton, Sweden. Amateur Radio station SK6SAQ will be active on Christmas Eve on 7,035 and 14,035 kHz on CW, or on 3,755 kHz on SSB. Two stations will be on the air most of the time.
Many thanks to SWLing Post contributor, Mike Thomas, who shares the following reply to our recently post highlighting a number of novelty radios. Mike writes:
That is a nice collection of novelty radios. I have a few of them but tend to focus on early production transistors.
[Here is a] picture of my collection:
This is a large photo–click to open and zoom in.
Wow! What a remarkable collection, Mike! Thank you for sharing!
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