On 13/03/2025 09:30, Chris Newman via USRP-users wrote:
Hi,
I found some documentation for the Timeprovider 4100 and there are 2
ports which can be configured to output either 1PPS or 10MHz. The
latter is a square wave so I guess I can plug that into the Octoclock:
image.png
The question now is if the Timeprovider's PPS output is compatible
with the Octoclock. I note the pulse width is configurable is set to
1000, and there is also an offset param:
image.png
And, if the PPS is ok then can the Octoclock derive the Freq from that
or is it better to plug both in separately.
On Thu, 13 Mar 2025 at 10:57, Chris Newman <chris@mode51.software> wrote:
Hi,
I'd like to use a Chronos Timeprovider 4100
<https://chronos.uk/product/telecom-master-clocks/timeprovider-4100-precise-timing-grandmaster-r2-4/>
to provide the input signals to the Octoclock CDA-2990.
Will the Octoclock accept the Timeprovider's signals for 10MHz and
PPS? Presumably the Timeprovider is outputting sine waves.
I see the Octoclock outputs the square waves needed by the SDRs.
Therefore, I guess the question is - can the Octoclock convert
sine waves to square waves?
The Octoclock FAQ states:
* *What are the input and output specifications?*
* 10 MHz Input – 0-10 dBm
* 10 MHz Outputs - ~1.4 Vpp Square Wave, Impedance 50 ohm nominal
* 1 PPS Input - Logic-level pulse, 2.5 V - 5 V
* 1 PPS Outputs - Logic-level pulse, 2.5 V - 5 V
--
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The Octoclock is basically a *distributor* of PPS and 10MHz. It cannot
use the 1PPS to phase-lock its internal clock.
For the 10MHz signal from your time-provider, I would insert a 3-5dB
attenuator, since the lowest level of the
TimeProvider output is right at the top end of what the Octoclock can
tolerate.
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