[time-nuts] BTTF : Austron 1210-C Crystal Clock

[Jeremy Nichols]

There's a 100C on eBay now, cheap, but it doesn't have a clock.

Jeremy

On Sun, Jun 11, 2017 at 9:51 PM Tom Van Baak <tvb at leapsecond.com> wrote:

> Hi Jim,
>
> Maybe a version of this?:
>
> http://leapsecond.com/history/Benchmark.htm
>
> The audible (1 kc) whine was probably from the model 113 or 115. See if
> any of the following pages remind you:
>
> http://leapsecond.com/hpclocks/
> http://www.radiomuseum.org/r/hewlett_pa_frequency_divider_and_cl.html
> http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1959-11.pdf
> http://hpmemoryproject.org/wb_pages/wall_b_page_01.htm
> http://hpmemoryproject.org/news/2012/vintage_01.htm
>
> /tvb
>
> ----- Original Message -----
> From: "Jim Harman" <j99harman at gmail.com>
> To: "Discussion of precise time and frequency measurement" <
> time-nuts at febo.com>
> Sent: Sunday, June 11, 2017 7:43 PM
> Subject: Re: [time-nuts] BTTF : Austron 1210-C Crystal Clock
>
>
> > On Sun, Jun 11, 2017 at 9:01 PM, paul swed <paulswedb at gmail.com> wrote:
> >
> >> But perhaps whats magical gold is the Patek Phillipe clock movement.
> Just a
> >> guess.I hear they are quite annoying clunkers actually. I have never
> owned
> >> one but a fellow in Europe was telling me you can really here them tick.
> >>
> >
> > In my first job back in 1973 I inherited a lab that included what must
> have
> > been an HP 100C frequency reference. It took up most of a rack and
> divided
> > down a 100KHz oscillator with cascaded injection-locked 10:1
> multivibrators
> > that used metal octal-base tubes. The final frequency of 100 Hz drove a
> > beautiful clock that made a very audible whine when it was working. This
> > must have been an option because I don't see any reference to it in the
> > 100C manual.
> >
> > At the bottom of the rack was a Hammarlund radio to tune in WWV for
> > calibration.
> >
> > IIRC the clock motor also drove an adjustable cam and microswitch. The
> > receiver's audio was fed through the switch. I think the idea was that
> you
> > could accurately measure the oscillator drift by adjusting the phase of
> the
> > cam until you could hear WWV's tick during the short time the switch was
> > closed.
> >
> >
> > --
> >
> > --Jim Harman
>
>
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