In reply to an earlier post, GPSDO Update, I received the following great implementation of a GPSDO using u-blox receivers. The pictures are rather self explanatory.
Hello again Simon!
I trust you are well and are enjoying the year end break.
We ( My good Wife and I..) have put your GPSDO software to good use. We used your message processing code almost as is, and added the various functions to drive my specific hardware and DAC, etc.
I have built up the complete GPSDO, with the 1-50MHz Analogue Devices AD9854 Quadrature DDS as a signal generator, provided with a 200MHz clock from the SI5351 PLL.
I also have a ‘signal generator’ output from another Si5351 channel, 1 to 200MHz, and a third channel output. square wave, from the GPS time pulse output, and can set outputs from 1Hz to 10MHz in decade steps.
I used a 7inch NEXTION graphics display for the display and control inputs ( touch screen) – that works very nicely!
I have run the unit for a few days now, and logged a 48hour period of data, every 10seconds, regarding the clock bias, drift, DAC output voltage etc, and the result looks very good indeed.
I am very pleased with the instrument and grateful for your assistance in providing your code. Thank You!
I have attached a few photos for interest.
Kind regards, and have a very good Christmas!
Joe and Gisela.