Hi Mauro --

Yes, the u-blox TIMEPULSE signal can be set for 10 MHz (and beyond that
on new units).  However, the spectral quality of the output is
horrendous because the receiver drops or adds pulses each second as
needed to maintain the long-term frequency which creates lots of jitter.
So for any sort of analog application you need to have a clean-up loop
(e.g., an XO/TCXO/OCXO stable enough to support a multi-second time
constant at the desired stability) following it.

John

On 1/18/23 05:20, Mauro Fiacco via time-nuts wrote:

see here
https://content.u-blox.com/sites/default/files/products/documents/Timing_AppNote_%28GPS.G6-X-11007%29.pdf
page 10
it seems that 10 mhz have jitter problem
oscillator is 48 mhz
F1CHF

Le 18/01/2023 11:53 pm, mcleannb--- via time-nuts a écrit :

On Thu, 19 Jan 2023 09:57:04 +0100
F1CHF via time-nuts time-nuts@lists.febo.com wrote:

A word of warning here. This document was prepared using a LEA-6T in 2011,
triggered by complaint of yours truly about the lack of application data of
the timing modules a year or two earlier. It probably still holds true for
the LEA-8 and NEO-8 modules. But the modern 9th and 10th generation modules
must have seen significant overhaul to accomodate for the dual frequency
receivers. Not to mention that close to 15 years have now passed since the
introduction of the LEA-6 series and it is likely that u-blox completely
redesigned their processor for the new silicon processes including the
internal control software. I.e. I would not trust this data to apply to
modern receivers without verifying it first.

			Attila Kinali

--
In science if you know what you are doing you should not be doing it.
In engineering if you do not know what you are doing you should not be doing it.
-- Richard W. Hamming, The Art of Doing Science and Engineering

The MAX-M8Q can do.  The TO output frequency and pulsewidth can be
programmed using the u-centre software.  Depending on the frequency the
signal may have quite a lot of jitter I believe.

John.

-----Original Message-----
From: Attila Kinali via time-nuts time-nuts@lists.febo.com
Sent: Monday, February 20, 2023 8:35 PM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Cc: Attila Kinali attila@kinali.ch
Subject: [time-nuts] Re: Can Ublox GPS NEO provide 10MHz signal?

On Thu, 19 Jan 2023 09:57:04 +0100
F1CHF via time-nuts time-nuts@lists.febo.com wrote:

A word of warning here. This document was prepared using a LEA-6T in 2011,
triggered by complaint of yours truly about the lack of application data of
the timing modules a year or two earlier. It probably still holds true for
the LEA-8 and NEO-8 modules. But the modern 9th and 10th generation modules
must have seen significant overhaul to accomodate for the dual frequency
receivers. Not to mention that close to 15 years have now passed since the
introduction of the LEA-6 series and it is likely that u-blox completely
redesigned their processor for the new silicon processes including the
internal control software. I.e. I would not trust this data to apply to
modern receivers without verifying it first.

			Attila Kinali

--
In science if you know what you are doing you should not be doing it.
In engineering if you do not know what you are doing you should not be doing
it.
-- Richard W. Hamming, The Art of Doing Science and Engineering

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on page 10 and ++ of the PDF it is clear that 10 mhz is not OK (jitter)
main oscillator is a 48 Mhz
73's de F1CHF

Le 20/02/2023 9:34 pm, Attila Kinali via time-nuts a écrit :

If you are mostly interested in 10MHz you could take a look at the Trimble
ICM SMT 360 - it's a quad system GNSS module with a dedicated 10MHz
output.  It's not exactly a high performance oscillator (-100dBc/Hz @
100Hz, IIRC), but it's certainly way cleaner than a Ublox set to 10Mhz.

Regards,

Pete

On Wed, Feb 22, 2023 at 10:14 AM F1CHF via time-nuts <
time-nuts@lists.febo.com> wrote: