[time-nuts] Short term 10MHz source

[Magnus Danielson]

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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