Of course it was "spread spectrum". But what was the center frequency of the
transmission?
The Titanic had a spark transmitter for wavelengths from 100 to 2500m, says
Google.
At this time longer was better. That was the reason why amateurs had to
go 200m
and down.
The 500 kHz calling and distress frequency was introduced later - after the
Titanic accident.
In the protocols of the radio conference in Atlantic City 1947 the maritime
radio service still owned the band 130 to 150 kHz, with a calling frequency of
143 kHz.
This is an indication that in these early days, ships used the long wave
spectrum and not mf.
May be the Titanic sent his final message not far away from our 136 kHz band?
73 de Toni
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