KGH used synchronous rotary spark gap transmitters.
2.
The primary was connected to a bank of oil capacitors to make a tuned circuit, excited by a rotary spark gap at 20-40 kilovolts from a powerful utility transformer.
3.
The output of a rotary spark gap transmitter was turned on and off by the operator using a special kind of telegraph key that switched power going to the high voltage power supply.
4.
This transmitter was one of the first Marconi installations to use a rotary spark gap, which gave " Titanic " a distinctive musical tone that could be readily distinguished from other signals.
5.
A number of rotary spark gaps were tried from time to time and the one used on the date of the broadcast was a modified commercial unit bought by Saunders on radio row in New York City in the summer of 1921 while he was attending an R . O . T . C . summer training camp at Red Bank, New Jersey.
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