10MHz GPSDO

 a note from David VK2DRT

A new developer has added greatly to the firmware of the GPSDO and has a vastly improved readme at the link below to help both programming and developing.

Suggestions and development continues are more people come on board.

 

https://github.com/fredzo/gpsdo-fw

 

Others have engineered little daughter boards that fix the output impedance/amplitude issues should that be important to you. It may not be perfect but it greatly exceeds the accuracy of my old frequency counter which is now bang on (once given an hour to warm up lol).

 

https://www.eevblog.com/forum/testgear/10mhz-gpsdo-by-bh3sap/

GPS info - NMEA serial data and 1pps output

I have added a write up  regarding GPS boards for extracting NMEA serial data for APRS use  and also extra 1pps (1 Pulse Per Second) signal for use with providing GPS locking of 10 MHz Reference signal  (or other Reference frequencies) for providing an accurate and stable source, typically for locking a Local Oscillator source for a microwave transverter kit, or for other transceivers used  for doing weak signal digital modes, such as WSPR and WSJT.

http://www.qsl.net/vk2kfj/gps.html