[time-nuts] Short term 10MHz source
John Ackermann N8UR
jra at febo.com
Tue Jan 8 18:48:22 UTC 2019
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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