Re: [Discuss-gnuradio] USRP2 + WBX How to use a 32 MHz signal band?

[Nick Foster]

On Wed, 2010-12-01 at 13:53 -0800, Vladutzzz wrote:
> The problem is that I am in the middle of a project, time is of the essence
> and I don't have time to start stumbling around with UHD, right now I have
> to use Simulink, hence UDP. GnuRadio Companion still doesn't work with UHD,
> right (I am very new to python)?

GRC has always worked with UHD. You might try downloading the latest UHD
and giving it a shot.

> So no chance of UDP working with 2 USRPs at once, huh?!

No.

> Let me ask you something else then, if I manage to synchronize 2 USRPs
> working on separate computers to start sensing a band of 16MHz each, and
> their central frequency being 16MHz apart, saving those two bands in a file
> , what block (system of blocks) can I use to compose a 32MHz band (and I
> mean the whole band not just their power measurements) from the two 16MHz
> halfbands originating from the "From File" blocks?
> Naturally the samplerate of the new signal should be the double of that of
> the halfbands.
> If I just use a 2:1 multiplex the halfbands appear superimposed and the
> resulting signal band still occupies 16MHz.

Assuming your signals are mixed to baseband you can interpolate both to
32Msps and mix one sideband up and the other down so they sit where they
are supposed to, and then add the signals together. There's probably a
smarter (faster) way to do it.

--n

> Any ideas?
> Your help is really appreciated,
> 
> Vlad.
> 
> 
> 
> Marcus D. Leech wrote:
> > 
> > On 12/01/2010 05:49 AM, Vladutzzz wrote:
> >> Thank you Marcus, for the very prompt and exhaustive reply!
> >> Mostly it's what I expected, but I am a wee bit worried about the IP
> >> addressing process:
> >> I need to change the IP of one of the USRP2 modules, how do I do that,
> >> considering I use an UDP FPGA image and not UHD?
> >> Also, what IPs should I use in the USPR2 source blocks, now that there's
> >> 2
> >> of them?
> >> Thanks!
> >>
> >> Vlad.
> >>   
> > My advice would be to screw up your courage, bite the bullet, and
> > convert to UHD.
> > 
> > Theres a UHD utility, usrp2_addr_burner that can be used to change the
> > IP address.
> > 
> > The factory address is: 192.168.10.2, you'll need to change it to an
> > address on a different
> >   subnet, like 192.168.20.2  or some such.  The idea is that you have
> > two GiGE ethernet ports,
> >   and you configure your system with the appropriate subnet on each
> > ethernet port, and program your
> >   USRP2 addresses accordingly.
> > 
> > 
> > 
> > -- 
> > Principal Investigator
> > Shirleys Bay Radio Astronomy Consortium
> > http://www.sbrac.org
> > 
> > 
> > 
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> > 
> > 
>