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Re: [Discuss-gnuradio] B100 as clock master + B100 as clock slave

From: Nick Foster
Subject: Re: [Discuss-gnuradio] B100 as clock master + B100 as clock slave
Date: Tue, 27 Mar 2012 09:05:33 -0700

On Tue, Mar 27, 2012 at 7:26 AM, Vincenzo Pellegrini <address@hidden> wrote:
Hi Nick, thanks for the answer.

Everything clear.
Just a further question. 
Would a 0V-mean, 3.3V peak-to-peak sinusoid be correct as a reference signal for the B100? 

Use a 5-10dBm reference with no DC component. This corresponds to 1-2V p-p.




Il giorno 23 marzo 2012 18:30, Nick Foster <address@hidden> ha scritto:

On Fri, Mar 23, 2012 at 10:18 AM, Vincenzo Pellegrini <address@hidden> wrote:
Hi Nick, 
I have noticed that "j101" onboard the B100 outputs a 64 MHz reference. 

Could it be possilble to feed that signal somehow into a second USRP B100 to be used as a reference?

You would have to go through some gymnastics (read: soldering) to get that reference into the second B100, and some code rework to recalculate clock rates based on a 64MHz (or divisor of 64MHz) instead of 10MHz.

Could it be possible as an alternative to lock two B100 to an external 10 MHz reference while still working at 8Msps sample rate ?

Yes, this is what the ref in connectors are for. The external reference is independent of the sample rate. The B100s will continue to operate normally, except locked to each other.



my best regards



Il giorno 23 marzo 2012 16:54, Nick Foster <address@hidden> ha scritto:

On Fri, Mar 23, 2012 at 3:41 AM, Vincenzo Pellegrini <address@hidden> wrote:
Hi everybody,

just a very quick question:

is it possible to enslave the clock of a B100 to the clock of another B100 via the "REF IN" input or in some other way?
More precisely, is there a way to extract the clock signal from a B100 and feed it into another B100 to enslave the latter to the former?

It would be great to be able to keep them in frequency and phase synch that way.


The ref in input on B100 is intended to accept a 10MHz signal. Multiple B100s can be synchronized by using a common reference, but there is no facility to lock two B100s to each other without a common external reference.


thank you 


Vincenzo Pellegrini

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