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, [email protected] wrote:
.gif of the TICC noise floor.
Luciano
Da "time-nuts" [email protected]
A [email protected]
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" [email protected]
A "Discussion of precise time and frequency measurement"
[email protected]
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:[email protected]] 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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