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 »
Decoding WWVB, part 2
I worked on detecting the timing information from the WWVB signal. Being able to locate the start of the second is important because it is the »
Decoding WWVB
I've been playing with decoding WWVB. I have a random wire antenna connected to my sound card's line in jack. The sound card is a Realtek »
Navspark NTP stratum 0 clock
Project Goal I want to create a stratum 0 NTP clock that does not require soldering or any special hardware. It should only require a USB »