TCXO TCXO RTC Raspberry Pi Hat, part 2 The motivation for this project is NTP servers in datacenters - it can be expensive to get a GPS antenna on top of other people's buildings with a wire running down into your
ntp TCXO RTC Raspberry Pi Hat HistoryI'm bringing my RTC Hats back online (source code and hardware design is on github). I originally designed it for frequency synchronization without phase alignment. I was going to write my own program
gps 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 try creating one myself. The hardware I
stratum2 Drift One of my goals with the RTC Pi Hats was to have a more stable local frequency. This is useful when you can't reach your upstream clock. GPS modules lose signal from time
TCXO 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 data is from the same Pi Hat
ntp TCXO RTC Hats: aging & RTC frequency I'm focusing on oscillator aging and RTC frequency in this post. See also: initial data, picture, other stratum 2 posts I've been letting these boards run to see what happens. My TCXO's aging
ntp TCXO RTC Hats: Initial data The TCXO RTC hats are collecting data. I'm focusing on the RTC part in this post. See also: other stratum 2 posts Required picture This hat is on an Odroid C2. The GPS
ntp TCXO RTC Hats My new stratum 2 NTP server hats arrived from Macrofab today! I have a few hand soldering things to do (32khz crystal and headers), and then I can start calibrating them.
time 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 went with for the two systems, and
time 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 built into the stm32 chip, a TMP36
time 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 are all on the i2c bus. The
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. They can run for years off of
stm32 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 on the STM32F030F4P6 (which is a 20-TSSOP
ntp 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 antenna away from the window and put
gps TCXO + Beaglebone Black, part 2 Starting from the previous TCXO modification, I wanted to get a 24MHz TCXO working. Trial #1 I bought a set of three undocumented 24MHz TCXO's off ebay for $6. I was hoping that
navspark TCXO + Beaglebone Black I've added support for an external clock (TCLKIN) to the Beaglebone Black timer driver. Setup I used what I had on hand to test it. I setup a Navspark microcontroller to send a