Minimal-GPSDO

** To download everything, MinGPSDO.zip **
The design criteria for this GPSDO (GPS disciplined oscillator) were:
● Output 10MHz accurate to better than ±0.01Hz (1 part per billion)
● Use low cost components (cheapest GPS module, etc.)
● Be self monitoring so the accuracy can be guaranteed without reference to a better standard
● Require no tuning by the user
● Give feedback to the user of the current status
● If it can be done in software, do it in software

The initial design consisted of a U-blox NEO-6M GPS receiver with active antenna, a PIC16F1455 microprocessor, a 74HC04 buffer powered by a 5V wall wart. This achieved the criteria.

The current design is the same with a more elaborate power supply. It is more stable than the original, and regularly delivers better than 10MHz±1mHz.

Features

Will accept most GPS modules. Requires 1 pulse per second and NMEA data at 9600 baud. Accepts 3.3V or 5V input
A single LED provides status, verifies correct operation or indicate error conditions
An optional user interface (9600 baud serial) provides second by second status, or can pass through the NMEA data.
Dithered PWM output has steps of less than 1 microvolt, significantly better than a 16 bit DAC

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