GPS module measurements, part 2
After the previous tests, I ordered another GPS antenna to improve the signal conditions. They're just the cheap puck style antennas with SMA connectors ($10 on »
GPS module measurements
Starting point I got a u-blox NEO-6M and I wanted to compare it to my NS-T. Since I don't have a frequency counter, I decided to »
TCXO aging part 2
The previous data I have on aging covered 10 days, and now I want to come back to this now that more time has passed. This »
PPS over USB
Goal For keeping your system clock on time, you can't beat the Pulse Per Second (PPS) signals available from $10 GPS modules. They typically have better »
Temperature compensation, part 2
In the last part, I measured the TCXO to fit a frequency vs temperature curve. Frequency vs Temperature curve Below are the final curves that I »
Temperature compensation
Temperature effects are usually the largest source of frequency changes in clocks. So I have three temperature sensors on my test system. The sensors are: one »
Frequency synchronization without phase in NTP
I've been working on my high accuracy RTC project. Here's a picture of one of the two systems: Connections The TCXO devboard, BME280, and PCF RTC »
RTC comparison
Real Time Clocks I bought two high accuracy RTC (real time clock) modules and wanted to compare them. RTCs are useful for very low power clocks. »
stm32f030 devboard with TCXO
I'm interested in making a high accuracy real time clock (RTC). To experiment with the hardware I need for that, I created a development board based »
GPS PPS drift when it has no signal
Question: What happens to a GPS receiver's pulse per second (PPS) when it loses signal for a long time? To answer this, I first moved the »