0_60_WPM_KEYER

Published:2009/7/11 3:51:00 Author:May | From:SeekIC

Uses μA747 (pair of μA741Cs in 10-pin TO-5 package). R2 adjusts relative length of first two dits to provide even spacing. Dot-dash ratio is set by C3 and C4, with C4 fordotand both in parallel fordash. Collector of C4 provides for keying positive voltage (20 V or less) to ground. Keying transistorwill handle up to 50 mA without heatsink. Characters are self-completing. Used with low-power transceiven-H. F, Batie, Introducing the Argomate, Ham Radio, April 1974, p 26-33.



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