RECORDED_CODE_KEYER

Published:2009/7/11 3:12:00 Author:May | From:SeekIC

CW message recorded on cassette tape with keyed tone generato r is played back for keying transmitter with frequently repeated messages. Transmitted signal is essentially perfect reproduction of recording. Automatic transmission can be stopped at any point by tapping hand key; this deactivates tape recorder for manual keying of transmitter. All transistors are 2N2222 or equivalent BCY58. Use 24-V reed relays with 1K coil resistance. Pilot lamps are 24 V rated up to 3 W.CR1 is silicon diode. Whenever recorder emits beep, positive signal appears at base of Q2, making it conduct and activate K1 whose contacts go to key jack of transmitter.-A. Day, An Audio Tape-Controlled CW Keyer, CQ, Nov. 1971, p 31-32.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/RECORDED_CODE_KEYER.html

Print this Page | Comments | Reading(3)