[time-nuts] using Fury GPSDO with Rb

Tom Van Baak tvb at LeapSecond.com
Mon Apr 21 23:04:28 EDT 2008

> For question for TomVB; is the shading in the raw plots the noise floor 
> of the instrumentation ?

Yes, the noise floor of the instrument, taking into account the
measurement time (which was one hour).

Note the noise of the reference itself isn't removed; for those
plots I used a HP 58503B as the reference.


> Brian
> SAIDJACK at aol.com wrote:
>> Hello Ulrich,
>> This is so true. See Tom's phase noise tests of a  Russian Rubidium prototype 
>> disciplined by a Fury GPSDO. Lot's of times  there is not much space to put a 
>> good OCXO inside the Rb's case.
>> BTW: using the Fury's 1PPS input, that unit can be used as a cleanup  loop 
>> for dirty Rb's that have 1PPS outputs.
>> _http://www.leapsecond.com/pages/fury/phase.htm_ 
>> (http://www.leapsecond.com/pages/fury/phase.htm) 
>> I just fired up my FTS1200-100 tonight for testing, it's dead on 5MHz. Does  
>> anyone have a good circuit idea to go from 5MHz to 10MHz? I was thinking of  
>> something similar to the HP5370B input circuit - basically a tuned amplifier  
>> locking onto the 10MHz overtone.
>> bye,
>> Said
>> In a message dated 4/19/2008 06:33:21 Pacific Daylight Time,  
>> df6jb at ulrich-bangert.de writes:
>> temperature related frequency changes in a typical flat. Given the  fact
>> that most rbs's stability at short observation times is worse that  that
>> of good xtal oscillators this makes the FTS1200 the best choice in  my
>> GPSDO despite of owning an LPRO101 and an FRK-L.
>> Best  regards
>> Ulrich

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