[time-nuts] Short term 10MHz source

[John Ackermann N8UR]

That makes sense.  I was thinking of the case where the reference and 
channels were asynchronous.

On 1/8/19 1:53 PM, Magnus Danielson wrote:
> John,
> 
> Depends on your setup. If one of the channels is synchronous with the 
> time-base, then you can expect much less noise on that channel, since 
> you are not sweeping two clocks asynchronous to the time-base, so you 
> will for relatively clean sources only expose a fractional range of the 
> phase errors.
> 
> Cheers,
> Magnus
> 
> On 2019-01-08 19:48, John Ackermann N8UR wrote:
>> Hi Luciano --
>>
>> Thanks for posting that.  There's a subtle point about the noise floor 
>> that's forever been on my list of things to investigate: the noise 
>> floor should be lower in timestamp mode than in time interval (A->B) 
>> mode.
>>
>> That's because in timestamp mode there is jitter contribution only 
>> from a single measurement, whereas in time interval mode there is a 
>> measurement from each channel so you have two jitter components.  So a 
>> guess is that the floor should be about sqrt(2) lower in timestamp 
>> mode.  Someday I will test that theory.
>>
>> John
>> ----
>> On 1/8/19 12:38 PM, timeok at timeok.it wrote:
>>>
>>>     .gif of the TICC noise floor.
>>>     Luciano
>>>
>>>
>>>     Da "time-nuts" time-nuts-bounces at lists.febo.com
>>>     A time-nuts at lists.febo.com
>>>     Cc
>>>     Data Tue, 8 Jan 2019 18:31:02 +0100
>>>     Oggetto Re: [time-nuts] Short term 10MHz source
>>>
>>>     Hi Paul,
>>>     here the TICC noise floor.
>>>     Regarding the GPS/TICC versus a good Rubidium standard like the 
>>> HP5065A , you cannot apreciate the Rubidium ADEV stability lower than 
>>> 10Kseconds.
>>>     Luciano
>>>
>>>
>>>     Da "time-nuts" time-nuts-bounces at lists.febo.com
>>>     A "Discussion of precise time and frequency measurement" 
>>> time-nuts at lists.febo.com
>>>     Cc
>>>     Data Sat, 5 Jan 2019 12:35:26 -0000
>>>     Oggetto Re: [time-nuts] Short term 10MHz source
>>>     Hi All sorry for a new be question but what is a TICC regards 
>>> Paul B UK
>>>
>>>     -----Original Message-----
>>>     From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On 
>>> Behalf Of Chris
>>>     Burford
>>>     Sent: 02 January 2019 03:56
>>>     To: Time Nuts List
>>>     Subject: [time-nuts] Short term 10MHz source
>>>
>>>     I have a situation in which I have access to a GPSDO 10MHz source 
>>> but for
>>>     only about 10-12 hours at a time. My current residence does not 
>>> allow a
>>>     permanent GPS antenna therefore I am limited in its use.
>>>
>>>     I do realise that the long term stability of the GPSDO is 
>>> somewhat superior
>>>     to a Rubidium source. I'm planning on using my TICC to validate 
>>> both my
>>>     GPSDO and RFS. I'm aware that such a short "power on" period is 
>>> somewhat
>>>     counterproductive but I have no other options. I'd like to know 
>>> if a 6-8
>>>     hour window for the GPSDO is sufficient for use as a 10MHz source 
>>> for the
>>>     TICC.
>>>
>>>     I appreciate any and all comments.
>>>
>>>     Regards, Chris
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>>
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