[time-nuts] The HP 10811-60111

Rick Karlquist richard at karlquist.com
Wed May 28 18:19:41 EDT 2008

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.

Rick Karlquist N6RK

Bruce Griffiths wrote:
> Roy Phillips wrote:
>> Arnold
>> Thanks for the picture/schematic , this is the item in question, and I
>> can
>> see that it comes from a 5328A manual ! - obviously a different issue
>> from
>> the one on the Agilent website. I gather that the 10544A is another Xtal
>> Osc. module ? - is there compatibility between the two ??
>>  regards
>> Roy
> Roy
> One difference is that the 10811will drive a 50 ohm load whereas the
> 10544A will not (it has an emitter follower output stage).
> The 10544A also using a switchmode oven controller whereas the 10811
> uses a quieter linear oven controller.
> Bruce
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