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Interposer to fix the Symmetricom SyncServer S200 GPS week rollover problem
A Hardware Interposer to Fix the Symmetricom SyncServer S200 GPS Week Number Rollover Problem - Introduction - IMPORTANT: Use the Right GPS Antenna! - The Problem: SyncServer Refuses to Lock to GPS - The GPS Week Number Rollover Issue - Making the Furuno GT-8031 Work Again - How It Works - Build Instructions - Power Supply Recapping - The Future: A Software-Only Solution - The Result - References - Footnotes Introduction In my earlier blog post, I wrote about how to set up a SyncServer S200 as a regular NTP server, and how to install the backside BNC connectors to bring out the 10 MHz and 1PPS outputs. The ultimate goal is to use the SyncServer as a lab timing reference, but at the end of that blog post, it’s clear that using NTP alone is not good enough to get a precise 10 MHz clock: the output frequency was off by almost 100Hz! To get a more accurate output clock, you need to synchronize the SyncServer to the GPS system so that it becomes a GPS disciplined oscillator (GPSDO) and a stratum 1 time keeping device.
In my earlier blog post, I wrote about how to set up a SyncServer S200 as a regular NTP server, and how to install the backside BNC connectors to bring out the 10 MHz and 1PPS outputs. The ultimate goal is to use the SyncServer as a lab timing reference, but at the end of that blog post, it’s clear that using NTP alone is not good enough to get a precise 10 MHz clock: the output frequency was off by almost 100Hz! Since the software update package is little more than a tar-archive of the Linux disk image that runs the embedded PC, it shouldn’t be very hard to make this happen, but right now, this doesn’t exist, and I’m happy with what I have.
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