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PIC16F628A firmware for the GPS-Based Frequency Reference (v3 & v4) Firmware (HEX file) and assembly language source code for the GPS-Based Frequency Reference. V4 is for use only with the newer V.KEL GPS receiver modules that run at 9600 baud instead of 4800. V3 still has the NMEA data stream at 4800 baud. Cat No SC1489. Price: Free Files: GPSFrqRfv4.zip (ZIP contains ASM and HEX files; 11.6KB) GPSFrqRfv3.zip (ZIP contains ASM and HEX files; 11.8KB) Related to: Project: GPS-Based Frequency Reference; Pt.1 (March 2007 [print issue] [online issue]) Project: GPS-Based Frequency Reference; Pt.2 (April 2007 [print issue] [online issue]) Project: GPS-Based Frequency Reference: Circuit Modifications (May 2007 [print issue] [online issue]) Project: Improving The GPS-Based Frequency Reference (September 2011 [print issue] [online issue]) Project: Improving The GPS-Based Frequency Reference (September 2011 [print issue] [online issue]) Other items relevant to these projects: GPS-Based Frequency Reference: PIC16F628A-I/P programmed for the GPS Frequency Reference [GPSFrqRfv3.HEX or GPSFrqRfv4.HEX] ($10.00) Add to trolley (with default options) Updated PCB pattern for the GPS-Based Frequency Reference (PDF download) [04103073] (Free) Add to trolley Display PCB pattern for the GPS-Based Frequency Reference (PDF download) [04103072] (Free) Add to trolley GPS-based Frequency Reference front and rear panel artwork (PDF download) (Free) Add to trolley Improving The GPS-Based Frequency Reference: GPS Frequency Reference Display PCB [04103072] ($15.00) Add to trolley Revised GPS-Based Frequency Reference PCB [04103073] ($20.00) Add to trolley Revised circuit diagram and PCB overlay for the GPS-Based Frequency Reference (Free) Add to trolley