[time-nuts] Varian R-20 Rubidium Frequency Standard

paul swed paulswedb at gmail.com
Wed Nov 5 15:54:51 EST 2014


Ignacio
I think you will find that Time-nuts agree about the CS and RB usage. RB is
cleaner for multiplying. At least thats my read from various time-nuts
threads over the years.
Regards
Paul
WB8TSL

On Wed, Nov 5, 2014 at 12:53 PM, EB4APL <eb4apl at cembreros.jazztel.es> wrote:

> Paul,
>
> You are right, NASA's Deep Space Network (DSN) used a pair of Sulzers in
> their Frequency and Timing subsystem.  At some time before 1972 they were
> replaced by a HP 5061A, a HP 5065A, and a HP Xtal oscillator, probably a HP
> 105B, the Sulzers remained in the rack several years but unpowered.
> A curious thing that I remember is that the Cesium was used for the clock
> and all the timing, but the Rubidium was used for frequency reference for a
> lot of equipment, mainly for multiplying up to microwaves for the
> transmitters and receivers. When I asked why, I was told that they were
> more phase clean for this application.
> Later an Hydrogen Maser replaced the Cesium as the primary reference and
> the crystal references were removed.
> The MSFN used in the Apollo program used a different Frequency and Timing
> Subsystem.
>
> Regards,
> Ignacio EB4APL
>
>
> On 05/11/2014 a las 15:27, paul swed wrote:
>
>> To a earlier comment I believe the NASA racks used Sulzers. Reason my 2 X
>> are NASA and still work just fine. :-)
>> Regards
>> Paul
>> WB8TSL
>>
>> On Tue, Nov 4, 2014 at 9:33 PM, Bob Camp <kb8tq at n1k.org> wrote:
>>
>>  Hi
>>>
>>> Yup I’ve seen that seller before. I’ve wondered a lot what they are up
>>> to.
>>> Everything they sell is roughly 10X above the going rate. Most of it has
>>> “buy it now” as an option.
>>>
>>> If you need the manual, offer the guy the $25 that it’s worth and see
>>> what
>>> happens. He may accept. Stranger things have happened. I’d only start the
>>> process on something I REALY needed. Life is to short to play silly games
>>> with some of these people.
>>>
>>> Usual disclaimer - never bought from the guy, don’t know anything about
>>> him, he may be a prince, he may have ties to the Society of Rome …I have
>>> no
>>> idea.
>>>
>>> Bob
>>>
>>>  On Nov 4, 2014, at 9:27 PM, EB4APL <eb4apl at cembreros.jazztel.es> wrote:
>>>>
>>>> Hi Adrian,
>>>>
>>>> I found one at ebay,  item #251687322849 but the crazy seller wants $249
>>>>
>>> for it.  All his manuals and books are tagged with so exorbitant prices
>>> which is a shame because its commercial value is nil.
>>>
>>>> Regards,
>>>> Ignacio
>>>>
>>>>
>>>>
>>>> On 04/11/2014 a las 16:34, Adrian wrote:
>>>>
>>>>> I got a nice old Varian R-20 rubidium frequency standard that would be
>>>>> nice to get working.
>>>>> To begin with, there is at least a problem with the voltage regulator
>>>>> circuit.
>>>>>
>>>>> Does anyone have a manual? I couldn't locate anything on the web.
>>>>>
>>>>> Regards,
>>>>> Adrian
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