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

[Jeremy Nichols]

The 100C was the de-rated version of the 100D, which DID have a clock. The
eBay listing is #172415409793 for $71.95 plus a whole lot for shipping.
It's been listed for a couple of months.


On Mon, Jun 12, 2017 at 6:58 AM Jeremy Nichols <jn6wfo at gmail.com> wrote:

> 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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