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 <[email protected]> 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 <[email protected]> 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" <[email protected]> >> To: "Discussion of precise time and frequency measurement" < >> [email protected]> >> 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 <[email protected]> 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 >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > -- > Sent from Gmail Mobile > -- Sent from Gmail Mobile _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
