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#timenut

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Royce Williams<p>For North America folks interested in low-maintenance, accurate atomic/radio clocks, but live outside the expected WWVB range¹ :</p><p>The La Crosse UltrAtomic large wall clock has a semi-novel internal two-antenna design that allows the WWVB signal to be picked up at greater distances (such as southcentral Alaska) when conditions are favorable (especially at night).</p><p>And since the modern WWVB signal² embeds DST/ leap seconds / etc well in advance of actual changes, and since the oscillator is relatively low drift ... the time accuracy window is pretty robust.</p><p>It takes either two or four D batteries. Four will get you around four years of life in ANC (in my experience).</p><p>So between the self-setting and the long battery life .... you can put a visible, affordable, low-maintenance clock in a hard-to-reach place, even in Alaska.</p><p>And here's a great teardown for the geeks:<br><a href="http://leapsecond.com/pages/ultratomic/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">http://</span><span class="ellipsis">leapsecond.com/pages/ultratomi</span><span class="invisible">c/</span></a></p><p>(not affiliated or compensated, just a fan!)</p><p>¹‍<a href="https://tf.nist.gov/stations/wwvbcoverage.htm" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">tf.nist.gov/stations/wwvbcover</span><span class="invisible">age.htm</span></a><br>²‍<a href="https://www.nist.gov/publications/wwvb-time-signal-broadcast-new-enhanced-broadcast-format-and-multi-mode-receiver" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">nist.gov/publications/wwvb-tim</span><span class="invisible">e-signal-broadcast-new-enhanced-broadcast-format-and-multi-mode-receiver</span></a></p><p><a href="https://infosec.exchange/tags/WWVB" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>WWVB</span></a> <a href="https://infosec.exchange/tags/Alaska" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Alaska</span></a> <a href="https://infosec.exchange/tags/TimeNut" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>TimeNut</span></a></p>
Josef 'Jeff' Sipek<p>Lately I've been looking at my <a href="https://mastodon.radio/tags/NTP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NTP</span></a> <a href="https://mastodon.radio/tags/rrdtool" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>rrdtool</span></a> graphs more often because I switched the NTP implementation on my <a href="https://mastodon.radio/tags/FreeBSD" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>FreeBSD</span></a> server from <a href="https://mastodon.radio/tags/ntpd" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ntpd</span></a> to <a href="https://mastodon.radio/tags/chrony" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>chrony</span></a>. Overall, I'm quite impressed with chrony - although it seems to be so good I wonder if I'm plotting comparable data. :) <a href="https://mastodon.radio/tags/timenut" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>timenut</span></a></p><p>Last week, I did a major OS upgrade and replaced a dumb switch with a managed one and set up LACP. Doing this however seems to result in weird latency/time offset spikes. Unplugging one of the two members cleans it up.</p>
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