Two DBSRX boards: same clock/LO

GNU Radio
1

What is the characterization of the clock/LO errors between two DBRSX
boards on one USRP? My spiral antenna has two arms which should be
sampled with the same clock.

Thank you,

Chris

2

Chris S. wrote:

What is the characterization of the clock/LO errors between two DBRSX
boards on one USRP? My spiral antenna has two arms which should be
sampled with the same clock.
The LO’s are locked because they are generated (with a PLL) from the
same 4 Mhz ref from the usrp.
There is of course some phasenoise, but they are usable for phasediff
measurements and such.
So I wouldn’t expect problems for you.

Greetings,
Martin

3

Two DBRSX boards and one USRP: Are the two signals sampled at the exact
same time? If not, how would the errors be described? I will be
looking at the difference in phase between the signals received by each
DBRSX.

Thanks,

Chris

4

Matt E. wrote:

The signals are sampled at the same time.

Thanks for the quick reply. Is this for all versions of the USRP and
DBSRX?

Chris

PS:
My USRP: “Gnuradio Rev 3 1-3-2005”
My DBSRX: “Rev 2.0”

5

Chris S. wrote:

Two DBRSX boards and one USRP: Are the two signals sampled at the
exact same time? If not, how would the errors be described? I will
be looking at the difference in phase between the signals received by
each DBRSX.

The signals are sampled at the same time.

Matt

6

Chris S. wrote:

Matt E. wrote:

The signals are sampled at the same time.

Thanks for the quick reply. Is this for all versions of the USRP and
DBSRX?

yes