Re: [Discuss-gnuradio] [USRP-users] USRP-1 and 4ch receiver?

[Martin Braun]

Hey Mamoru,

On 09.08.2014 21:17, Mamoru Yamamoto via USRP-users wrote:
> 2) Your suggestion of "2 x B210" is very interesting.  A good thing is
> that the frequency conversion is included in the board.  But I want to
> know how to run 2 USRP boards from one application program.  Is there an
> example?  If possible I want to use GNU Radio Python code, but is this
> possible?  If not, do we need to control from C++?  In my application
> "phase coherency" across all inputs are necessary.  "timing
> synchronization" is not necessary.

This is, in general, possible. For some devices (e.g. N210), you can 
spawn a USRP Source/Sink that will talk to several devices, and allocate 
channels accordingly (e.g., channel 0 -> device 1, channel 2 -> device 2 
etc.). With B210, you simply create a USRP source for every device you 
have. If they are both connected to the same clock source, you have 
synchronized receivers.

> 3) One more question.  If 2) is possible, is it possible to run "2 x
> USRP-1" from a single application on a single PC?

You can also create two USRP Sources, one for each USRP1. However, 
unlike N210 or X310 for example, you can't synch them through software.
Use the "serial=XXX" or "name=XXX" device addrs to address these.

M