Re: [Discuss-gnuradio] Help getting started

[Written]

Hi Dan,

What daughterboards are you using?

Thanks,

Written


Dan Halperin wrote:
> 
> Hi all,
> 
> I'm just beginning grad school and trying to get my USRP board up and 
> running so I can start playing. I've tested our equipment on two 
> different machines now; one an older box running FC4, 512MB ram, with an 
> Intel(R) Celeron(R) CPU 2.40GHz. I've also tried one on a newer laptop  
> (compaq v3000 series) running Gentoo Linux, with 2GB of memory. I've had 
> /all kinds/ of interesting phenomena:
> 
> I first tried installing the way on the old wiki 
> http://www.comsec.com/wiki?UniversalSoftwareRadioPeripheral (first link 
> on Google for USRP), and then again using the new say (svn source 
> checkout using the instructions on the new wiki), on both machines. On 
> the older machine, I don't get any rx/tx over/underruns (or maybe just 
> one when initializing) and a throughput of 32MB/s in both directions, 
> and on the laptop I get exactly 41 under/over runs with a throughput of 
> ~31MB/s in the RX direction and around 24 in the TX direction. As far as 
> I could tell, these used the same version of the source, but then again 
> the SVN repository has jumped from rev. 3772 to rev. 3785 since 
> yesterday morning.
> 
> Anyway, installation, make check, and the ./test_standard_?x scripts 
> work fine (the LED behaves as expected and the benchmarks seem 
> reasonable), however I get nothing when running the usrp_oscope or 
> usrp_wfm_rcv scripts as directed in the instructions. Both dial tone 
> scripts work fine, by the way. The scope and FM receive scripts run 
> fine, but I hear just hear/see static. If I set the oscope to 900MHz and 
> bring my cordless 900MHz phone around, there's no change in the scope. 
> If I can the entire FM spectrum in the other script, I don't get 
> anything but static anywhere. My little portable CD player can hear the 
> radio just fine in this lab, so I figure the foot-long copper antenna 
> that came with the USRP ought to as well. I don't know a lot about 
> communications...
> 
> 
> Also, the different test_digital_loopback and test_counting scripts seem 
> to not work very well at all. I don't know if they're expected to, but 
> about 50% of the tests that look vaguely "expected 517, got 0" fail.
> 
> 
> Is there any advice you can offer as to how to determine what, if 
> anything, is wrong here?
> 
> Thanks,
> 
> Dan
> 
> 
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> 
> 

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