[time-nuts] The HP 10811-60111

Magnus Danielson magnus at rubidium.dyndns.org
Wed May 28 18:28:41 EDT 2008

From: "Rick Karlquist" <richard at karlquist.com>
Subject: Re: [time-nuts] The HP 10811-60111
Date: Wed, 28 May 2008 15:19:41 -0700 (PDT)
Message-ID: <11483. at webmail.sonic.net>

> A 10811 is guaranteed to work in any 10544 socket, but
> not necessarily vice versa.  This enabled HP to avoid having
> to have a lifetime run of 10544's.  The internals are totally different.
> Besides the different oven design, the oscillator circuit
> is completely different and it uses an SC cut crystal
> instead of an AT cut.  The main advantage of the 10811
> over the 10544 is faster warm up from a cold start.
> I'm sure most time nuts keep their oscillators running
> all the time, so the fast warmup is moot.

Some of the good old gear also kept the oscillator heated while the rest was
turned off. Some Tek specs even refuses to start until the oscillator is


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