The effective_wpm command is used to enable characters to be generated at a fast rate, whilst increasing the space between characters to make it easier to receive those characters (often known as the Farnsworth Technique).

For a very thorough explanation of Farnsworth Timing check out A Standard for Morse Timing Using the Farnsworth Technique (pdf) by Jon Bloom, courtesy of The Americal Radio Relay League.

  require "cw"

cw do
  wpm           25
  effective_wpm 12
  word_count    4

Tags: commands