[time-nuts] Used Hydrogen Maser

[Bob kb8tq]

Hi



> On Feb 6, 2021, at 5:44 PM, Bill Notfaded <notfaded1 at gmail.com> wrote:
> 
> Let me know when I can buy one please!  I'm not kidding.  ;^}
> 

This thread has drifted from Hydrogen Masers, to Mercury Ion clocks,
to long beam Cs standards, and passes things like 5071’s while doing so.

Which of those items are you after? 

In some cases the answer is maybe $100K, in others maybe 5X that. For 
other items on that list you would be funding a development project …..

Bob


> Bill in Arizona
> 
> On Sat, Feb 6, 2021, 1:25 PM Tom Van Baak <tvb at leapsecond.com> wrote:
> 
>>> ptti/1981papers/Vol%2013_30.pdf
>> 
>> Note the dialog on the last page. Dave Wineland went on to win the 2012
>> Nobel prize in Physics:
>> 
>> 
>> https://www.nist.gov/nist-and-nobel/dave-wineland/person-behind-nobel-prize-dave-wineland
>> 
>> The first photo is fun, "Before he was a quantum mechanic...". Then
>> there's this recent press release:
>> 
>> https://around.uoregon.edu/wineland
>> 
>> The lovely photo of NBS-6 (NIST cesium clock) comes from:
>> 
>> https://www.nist.gov/image/img044jpg
>> 
>> And for a nice trip through the past, including NBS-1 and NIST-7 see:
>> 
>> https://www.nist.gov/si-redefinition/second/second-past
>> 
>> /tvb
>> 
>> 
>> On 2/6/2021 10:05 AM, Attila Kinali wrote:
>>> Moin,
>>> 
>>> On Wed, 10 Jul 2019 10:55:07 -0700
>>> "Richard (Rick) Karlquist" <richard at karlquist.com> wrote:
>>> 
>>>> FWIW, about 20 years ago, Len Cutler and Robin Giffard of 5071A fame
>>>> built several Hg ion clocks to be shipped to some govt customer I
>>>> don't remember.  One of the clocks was dropped by the shipping company
>>>> UPS or FedEX) and destroyed.  Only then did Len learn that HP was
>>>> self insured, probably as part of a package deal to get a low
>>>> corporate shipping rate.  HP products were packed extremely well, so
>>>> the only real risk was the unit getting stolen.  I vaguely remember
>>>> Len saying they were out $10K, which was probably just the cost of
>>>> parts.  Nevertheless, it didn't seem like building an Hg clock was
>>>> all that big of a project.  Way simpler than the 5071A.
>>>> Now a days, the electronics would be considerably easier and cheaper.
>>>> The mechanical parts would all be CNC'ed by an online machine shop.
>>> Magnus just send me out to chase an (unrelated) paper and I stumbled
>>> over [1] which describes the Hg standard that Cutler & Co built.
>>> Remembering this discussion I thought it might be interesting to
>>> some.
>>> 
>>> 
>>>                      Attila Kinali
>>> "Trapped Mercury 199 Ion Frequency Standard", Cutler,
>>> Giffard,  McGuire, PTTI, 1981
>>> http://time.kinali.ch/ptti/1981papers/Vol%2013_30.pdf
>>> 
>> 
>> 
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