For more information:
https://www.leader.co.jp/en/company/overview/history/
https://www.radiomuseum.org/r/leader_lag55_lag_5.html
https://elektrotanya.com/leader_lag-55_audio-generator_user_sm.pdf/download.html
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https://www.youtube.com/watch?v=K8hCLD78EdA
RWM is a Russian shortwave time signal station.
The frequencies are very close to those of WWV, and WWVH. Because of this, RWM is very difficult to receive in North America with simple receivers of low selectivity, due to interference from these said stations.
https://www.sigidwiki.com/wiki/RWM
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https://www.youtube.com/watch?v=HfKd-LlZkmE
Every morning before work, i like to turn on the shortwave radio and have a listen around the band to see if can hear some interesting stations and signals.
Super fast Morse code operations i have always found impressive to listen too. :-)
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https://www.youtube.com/watch?v=--Mgdl3CGPY