On 08/08/2017 12:38 AM, Jose Ruvalcaba via USRP-users wrote:
Hello,
I was wondering if someone could shine some light on when would
someone use an OctoClock or a GPSDO on say a USRP B210. Would I need
an OctoClock if I am connecting 2 USRP's that are talking to each
other? Would I need a GPSDO if I am just using a single USRP B210?
Regards,
Jose
An external clock-source, like a GPSDO, will provide a more-accurate,
lower-phase-noise master clock. That's important in some applications
and not at all
in others.
For a signifcant class of applications, the "native" 2.5PPM TCXO is more
than adequate. Most well-behaved receiver applications, for example, can
and do compensate for frequency differences between TX and RX. It is
very rare that two communicating (remote from one another) radios will
require very accurate frequency, such as provided by a GPSDO.
Where a single external reference clock (and 1PPS) is really needed is
for synchronization of multiple devices where phase-coherence is
necessary, such
as beamforming, MIMO, interferometery, aperture synthesis, etc.
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