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From Free Knowledge Base- The DUCK Project: information for everyone
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An iambic keyer consists of two separately actuated switches.Iambic operation is useful for sending characters that have alternating patternssuch as a period or the letter C.[[File:iambic-left-hand320.gif]]==Mode A and B==Mode A and B refer to the way that a Morse code keyer handles iambic (squeeze)keying so first, let’s define iambic keyer operation. An iambic keyer will send analternating sequence of dits and dahs as long as both the dit and dah switches aredepressed or squeezed.