gps Beaglebone Cape for NS-T, revision 2 I'm testing the second revision of this cape now. Schematic is on github (left: rev1, right: rev2) It's working much better than rev1, but time will tell if it has the same frequency
gps Update on Beaglebone Cape for Navspark NS-T The cape has been running for 5 days now. I've been tweaking the system to see if I can get it stable. So far, the local clock looks like this: The red line
navspark Beaglebone Cape for Navspark NS-T Goal My next goal in the quest for a better NTP server is to improve the TCLKIN source. Previously, I was experimenting with TCXO's. I bought a Navspark NS-T (a timing-grade GPS receiver)
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
gps Beaglebone Black timer capture driver More info on: Hardware, Kernel Driver software The Beaglebone Black has a hardware timer capture. This means it can save the couter value at the time an input edge happens. Since it has
gps Beaglebone Black GPS+Temperature cape I moved my Beaglebone Black GPS+Temperature setup from a breadboard to a proto cape. The soldering isn't great, and the wire I had on had was much too thick for this. The
gps Beaglebone Black NTP/GPS Server, Temperature Compensation part 2 See the Part 1 of Temperature Compensation or the hardware setup Overview In part 1, I did a trial run of chrony's temperature compensation and got a pretty good result. In this part,
gps Beaglebone Black NTP/GPS Server, Temperature Compensation part 1 See also: The hardware/software setup or part 2 Overview Chrony (the NTP server software) has temperature compensation built in, using a quadratic forumla to estimate the effect of temperature changes have on
gps Beaglebone Black NTP/GPS server Goals I wanted to experiment with using temperature measurement to augment a NTP stratum 1 server. I started with a very similiar setup to this one. [Edit: the8thlayerof.net is gone, link changed