PULSED_MARKER

Published:2009/7/21 5:34:00 Author:Jessie | From:SeekIC

Crystal calibrator circuit provides pulsed output for easy spotting, eliminating need for turning marker on and off repeatedly to identify it in crowded band. With values shown, switching rate is about 2 Hz. When marker is found, placing S1 in CW position keeps it on for zero-beating calibrator output more accurately. Reducing value of C1 increases switching speed of U3, thus increasing pulse rate. LED indicates either pulsed or CW output. ICs are conventional types used in crystal calibrators.-R. G. Brunner, Crystal Calibrator Has Pulsed Output, QST, Nov. 1977, p 45.



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