The TICC hardware design has features that make it possible to synchronize and run several units from a common clock, allowing creation of 4, 6, 8 or even larger multi-channel timestamping counters. The TICC firmware has sort-of supported this capability as well. I think a couple of people may have tried it, but I haven't had any feedback on their results.
A recent project here led me to build an 8-channel "multi-TICC" and update the firmware to match, and I've documented how it's put together and how it works in the first-ever TAPR Appplication Note. It's a bit too large for the list, but you can download it from: https://github.com/TAPR/TICC/blob/master/multi-ticc/multi-TICC_App_Note_2020-01.pdf and probably other locations later. As a teaser, attached is a plot showing ADEV of 8 GPS units measured simultaneously for over 500K seconds vs. a Cesium standard. The multi-TICC currently is *not* available as a TAPR product. The material cost is significant, as is the labor required for assembly and testing. We suspect that this is very much a niche device, and TAPR can’t justify the financial and human resources required to stock it as a completed item. However, we know of sources potentially willing to build units to order. Please contact me if you’re seriously interested in that. Enjoy! John PS -- the system includes a Python server script running on a Raspberry Pi. If someone would like to help me robustify that code, I would appreciate that very much.
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