[time-nuts] HP 100D FS [WAS: HP 105D FS]

Jeremy Nichols jn6wfo at gmail.com
Sun Apr 9 19:20:50 EDT 2017

Up through and including the 101A, only the crystal was ovenized; the
oscillator itself was not temperature controlled other than via the
environment in which it lived. Given that the 100 series was mostly vacuum
tubes, that is understandable. I was a little surprised to discover that
the solid-state 101A had only the crystal in its oven and, in fact, its
specs are no better than the vacuum-tube 100E. Later models moved more and
more stuff into the oven and the specs got better.


On Sun, Apr 9, 2017 at 1:02 PM Charles Steinmetz <csteinmetz at yandex.com>

> Perry wrote:
> > The HP oscillator is a 100D Low Frequency Standard..
> > Sorry for the brain fart.
> For a bit more information on the 100D (and 100C), see the October, 1949
> Hewlett Packard Journal:
> <http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1949-10.pdf>
> Note the accuracy and stability specs:
> ACCURACY:  Average stability is within approximately two parts per
> million per week.
> STABILITY:  Within one part per million over short time intervals, such
> as required to make a measurement.
> The price in 1949 was $600 f.o.b. Palo Alto.
> Best regards,
> Charles
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
Sent from Gmail Mobile

More information about the time-nuts mailing list