[abigkahuna]

Pretty low—the article says 600m wavelength....but I don’t know if that is what they mean. 600Mhz? in the AM band? very possible as it was before “radio.”

[PUGACHEV]

I found a facinating article on the Titanic's radio communications. The Titanic had a 5KW transmitter which operated on either 500Khz (600 m) or 1Mhz (300m). Because it was a spark gap transmitter, there were substantial harmonics, so a lot of that 5Khz produced other frequencies as well. The Titanic's antenna was itself a titanic bed spring design stretching almost from stem to stern.

Titanic used a Marconi system, which was in competition with the Telefunken system for marine radio telegraphy. Marconi used CQD -.-. --.- -.., Come Quick Disaster, for a distress call while Telefunken had switched to SOS ... --- .... Titanic's Marconi call sign was MGY or -- --. -.--

McBride intentionally slowed down his transmissions to 15wpm for clairty, while the responding ships sent at 40wpm. It may seem incredible that those speeds could be used routinely, but my grandfather was a telegrapher for the Lehigh Valley Railroad in his youth, and sixty years later, although nearly blind, he could sit by the shortwave and still copy down faster than that.