Hi Marcus,

Thank you very much!

Regards,
George

On Sat, Mar 25, 2023, 4:05 PM Marcus D. Leech <patchvonbr...@gmail.com>
wrote:

> On 25/03/2023 15:45, George Edwards wrote:
> > Hello GNURadio Community,
> >
> > I am about to use a N310 radio to transmit and receive data. My
> > problem is I do not know how to interpret the sample rate parameter. I
> > will pose some questions that I am seeking answer to (I read there are
> > 3 Master Clocks for the N310):
> >
> > Q1. The transmitter Sample Rate setting: is this the sample rate of
> > the data that will enter the N310 hardware from the GRC software
> > component?
> yes.
>
> >
> > Q2. The receiver Sample Rate setting: is this the sample rate that the
> > N310 hardware outputs the connected GRC software component?
> Yes
>
> >
> > Q3. Now I was reading the interpolation/decimation in the N310 radio
> > and there were statements made about the device having 3 Master
> > Clocks. Let's assume I choose the Master Clock frequency of 125e6 for
> > the transmitter and I wish to upsample by a factor of 100 in the N310
> > transmitter. I take it that this assumes that  GRC component connected
> > to the N310 USRP Tx block must be running at a sample rate 1.25e6 and
> > that by setting the Sample Rate in the USRP block to 1.25e6 (with the
> > Master Clock set to 125e6) then N310 hardware will upsample the data
> > entering to 125e6, right?
> Yes.
>
> >
> > Q4. Now, for the converse at the receiver: with the USRP Master Clock
> > set to 125e6 and USRP Sample Rate set to 1.25e6, then the USRP block
> > will deliver a sample rate of 1.25e6 to the attached  GRC component,
> > right?
> Yes,
>
> >
> > Q5. What happens if I do not select one of the Master Clocks, but
> > provide the Sample Rates at the respective USRP Tx/Rx?
> The default master-clock if you don't specify in a device argument is by
> default (as I recall) 125MHz.   But that can be
>    easily verified by asking for some sample-rate that is a proper
> fraction of 125MHz, and seeing if UHD changes it to
>    something different.
>
>
>

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