I recently purchased an inexpensive 10MHz OCXO reference clock module on eBay for less than $30.
Above is the seller’s description of the module.
The performance of this product is very much dependent on the OCXO component on the board. Continue reading Plaza 10MHz OCXO review
TinyPFA is firmware from Erik Kaashoek for NanoVNA-H4 hardware for accurate measurement of oscillator and clock source stability.
I was so impressed with the possibilities of the project, I purchased a new Nanovna-H4 v4.3 a couple of weeks ago to dedicate to this application.
Anticipation got the better of me, and I put tinyPFA onto my existing Nanovna-H4 v4.3 to evaluate it, and was not disappointed.
Anyway, the recently ordered device arrived.
Above, the new tinyPFA at work. Continue reading tinyPFA – new Nanovna-H4 arrived
TinyPFA is firmware from Erik Kaashoek for NanoVNA-H4 hardware for accurate measurement of oscillator and clock source stability.
This article documents calibration and stability comparison of a HP8656B signal generator’s high stability reference oscillator.
Above is a screenshot of the tinyPFA with only Trimble Thunderbolt GSPDO input, and after freq A is nulled (colours have been inverted for printing). Continue reading tinyPFA – HP8656B vs Trimble Thunderbolt GPSDO
TinyPFA is firmware from Erik Kaashoek for NanoVNA-H4 hardware for accurate measurement of oscillator and clock source stability.
This article documents a comparison of:
Continue reading tinyPFA – Trimble Thunderbolt GPSDO vs Leo Bodnar Precision GPSDO
TinyPFA is firmware from Erik Kaashoek for NanoVNA-H4 hardware for accurate measurement of oscillator and clock source stability.
This article documents an experiment to measure the Allan Deviation of several sources:
So, to make a two way comparison or three sources, there are C(3,2)=3 difference combinations, and a fourth test to document the instrument noise floor (connect the same source to both inputs).
TinyPFA and Timelab were used to make the measurements.
The GPSDO reference used was a Trimble Thunderbolt GPSDO which is locked. Continue reading tinyPFA – a set of Allan Deviation plots
TinyPFA is firmware from Erik Kaashoek for NanoVNA-H4 hardware for accurate measurement of oscillator and clock source stability.
This article documents a first experience with it performing a quite simple operation, calibrating the internal 10MHz reference oscillator of two devices:
The calibration reference used was a Trimble Thunderbolt GPSDO which is locked. Continue reading tinyPFA – first experience