On 12/04/2018 10:14 AM, Florian Kaltenberger via USRP-users wrote:
Hi there,
I just discovered that in addition to the external 10MHz reference in,
the USRP N310 also has external local oscilator inputs, one for each
daughterboard and each TX/RX. So does that mean that in order to
synchronize multiple N310 in frequency, phase, and time, it is no
longer sufficient to use an octoclock to provide a 10MHz reference and
PPS? If so, at what frequency do you have to drive the external LOs
and at what power?
Florian.
In addition to what Robin posted, I'll observe that the external LO port
is an *additional feature* of this device.
You should still be able to use the external 10MHz and 1PPS ports the
same way you would with a B210 or E310, since the AD9371
front-end chip is similar to the AD9361 chip used in the B210 and E310.
The thing about synchronizing multiple independent PLL synthesizers,
though, compared to a strictly-shared-LO, is that the former will
experience both phase ambiguities, and have a higher mutual
phase-noise than the latter, which is why you might decide to choose
the latter.
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