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PIC16F628A-I/P programmed for the GPS Frequency Reference [GPSFrqRfv3.HEX or GPSFrqRfv4.HEX] PIC16F628A-I/P 8-bit microcontroller programmed with the firmware for the GPS Frequency Reference. V3 is for GPS modules that have a 4800 baud rate NMEA data stream. V4 is for the newer V.KEL GPS modules that have a 9600 baud rate NMEA data stream.
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