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

[Vladutzzz]

NIck,
What do you mean by "mix one sideband up and the other down"?
How would that go?
Thanks

Vlad.



Nick Foster-4 wrote:
> 
> 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
>> > 
>> > 
>> > 
>> > _______________________________________________
>> > Discuss-gnuradio mailing list
>> > address@hidden
>> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> > 
>> > 
>> 
> 
> 
> 
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> 

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