Jim:
Correct -- arc transmitters operated on the negative resistance
principle, as a portion of the E vs I curve for an arc has an area of
negative resistance. As such, the arc worked as an amplifier or
oscillator, thus yielding a continuous wave. (Same concept as a tunnel
diode, as a matter of fact.)
See pages 44-55 of "The Science of Radio" by Paul Nahin.
Jack
[EMAIL PROTECTED] wrote:
In a message dated 6/7/07 7:22:30 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
Communications using Morse code by keyed continuous waves" in contrast to
"communications using Morse code by keyed damped waves," which was the type of
signal emitted by those old spark and arc transmitters of yesteryear, until
alternators and vacuum tube oscillators were available to emit continuous
waves during key-down. CW vs. DW!
I could be mistaken, but it is my understanding that arc transmitters (like
the Poulsen arc) generated continuous (undamped) waves.
73 de Jim, N2EY
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