PIN_DIODE_TR_SWITCH

Published:2009/7/13 23:22:00 Author:May | From:SeekIC

Solid-state TR switch operates at very high keying speeds and handles up to 100 W while transferring antenna between receiver and transmitter in accordance with transmitter keying demands. Uses Unitrode UM4004 PIN diodes to provide about 0.2-dB insertion loss when forward-biased and about 30-dB isolation when reverse-biased. CR1 is forward-biased for about 45 mA DC and CR2 is reverse-biased by 124 V during transmit, for minimum loss in CR1 and maximum isolation in CR2. Circuit is designed to operate from collector of keying-circuit transistor in Touchcoder II (in dotted lines at lower left), but any source providing required T (transmit) and R (receive) DC voltages shown on diagram will key circuit. Article covers construction in detail.-J. K. Boomer, PIN Diode Transmit/Receive Switch for 80-10 Meters, Ham Radio, May 1976, p 10-15.



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