TRANSCEIVER_MEMORY_BACKUP

Published:2009/6/18 2:52:00 Author:May | From:SeekIC

Although designed for a Kenwood TR7730, this idea might be adapted to other transceivers. This circuit will retain the frequencies in memory while moving the rig from car to house and vice versa. When connected to an external power source, battery B1 is charged through R1 and D1.D1 prevents B1 from discharging when connected to an extemal supply that is tumed off. When extemal power is removed, D2 provides a current path to the TR-7730 to retain the memory's contents. However, the TR-7730 power switch should be tumed off before extemal power is removed because B1 will not provide power for normal operation.



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