Everset Technologies
I was looking at this patent: https://patents.google.com/patent/US8774317B2 it *appears* that it's not in force ? Otherwise if it was still in force it would run until 2032 as I understand it. Everset is the company that got the NIST to change the modulation of WWVB, adding BPSK to give better coverage in weak signal areas. This has never caught on, must be the cost ? Two antennas are used with the Everset - the only clock I could find using the Everset chip is this one from Lacrosse: https://www.ebay.com/itm/388836130899 A video on the Ultratomic clock: source: https://www.youtube.com/watch?v=wqJA7hVym90 two interesting points from the video: first, the Ultratomic clock uses two (or strangely four) C cells rather than the single AA cell in most "atomic clocks". C cells are harder to find than AA or D cells but a big point for me: Energizer doesn't sell lithium primary cells (leak proof) in C size. So that's kind of a deal cruncher for me - I need th...