We built a spark
transmitter to simulate his first voice over radio transmission. We did as he did,
i.e. operated at 10,000 sparks/sec, inserted a carbon microphone in the antenna lead, and
shouted into the mike.
Lo and behold, "words
perfectly clear except accompanied by an extremely loud disagreeable noise"!!
here to read the full article, see the
schematic drawings recreated by Dr. Belrose as well as listen to a
recreation of Fessenden's first voice transmission.
Click here for the 2006
recreation of Fessenden's Christmas Eve broadcast