87Rb Stratum 1 NTP Server – SOFTWARE

All is mounted inside my old 2850 rack case, ready to launch The software it’is basically a shell script that resides in  FreeBSD sources , and usually you can find it as nanobsd.sh under the folder /usr/src/tools/tools/nanobsd/ . It creates a very little version of FreeBSD that fit into a common 512 MB Compact Flash card. […]

87Rb Stratum 1 NTP Server – HARDWARE

First operative test of the RB Stratum  1 Server Following  Poul-Henning Kamp  project  to modify a 4501 router to build a Stratum 1 NTP server , I’ve decided  to build my own using instead  a Rubidium Frequency standard source of 10 MHz to clock the Elan processor inside the Soekris.  It requires some hardware changes […]

Efratom M-100 : First View and Test

 What are we talking about? Today I’ll talk about this magnificent little device found on eBay : the  Efratom M-100.First of all, what is a Rubidium Frequency Standard?  It’s an atomic clock.Just in the 80-90 they were such  an expansive units! The working mechanism is fascinating. It uses the hyperfine transition of electrons in rubidium-87 atoms […]