The Receiving System For Long-Wave Transatlantic Radio Telephony1
Austin Bailey, S. W. Dean, William T. Wintringham · Bell System Technical Journal · 1929
Transmission considerations and practical limitations indicate that in the lower frequency range, frequencies near 60 kc are best suited for transatlantic radio-telephone transmission. A radio receiving location in Maine gives a signal-to-noise ratio improvement over a New York location equivalent to increasing the power of the British transmitter about 50 times.