So I find older technologies just as fascinating as the new stuff. In the early years of flight, radio navigation was often the best and only option besides pilotage and dead reckoning. And radio comms are obviously still in use. However what about the “senior service” as the RAF refers to the RN? Here’s a pretty interesting 20 minutes detailing how CW (or morse to us land folks) was used.
A CW (= current wave, morse) transmitter kit from 1962:
And a (retro) home-made (DIY) low-power morse transmitter:
A very inetesting is this website about restauration and overhauling of old communication radio equipment: US Navy Radio Communications - 1950’s & 1960’s (navy-radio.com)