[time-nuts] Short term 10MHz source

[Magnus Danielson]

Hi John,

Sure, and that makes perfect sense for that context. I'm just saying 
that sometimes the setup may perform better than expected as you end up 
accidentily in this setup, or you can choose to use this intentionally.

Cheers,
Magnus

On 2019-01-08 21:11, John Ackermann N8UR wrote:
> 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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