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Re: [Discuss-gnuradio] usrp & ppc-linux
From: |
Matt Ettus |
Subject: |
Re: [Discuss-gnuradio] usrp & ppc-linux |
Date: |
Thu, 10 Feb 2005 11:00:34 -0800 |
User-agent: |
Internet Messaging Program (IMP) 4.0-cvs |
Quoting kilian <address@hidden>:
> mentioned USB performance and now I would like to add another data point
> to it. After I found out that I had to upload the firmware first, using
> 'burn-usrp2-eeprom', I ran test_usrp0 and got the following output:
Thanks for the data. 24 MB/s isn't too bad. The max we normally see is 32
MB/s.
> noverruns = 171
I'd be more worried about the overruns, but this may be a problem with the fact
that you ran a USRP0 program.
> I mainly got the board for educational purposes and possibly to build a
> receiver (to cover 1-30MHz as a first step). Now that the possibilities
> (4RX/4TX channels) are starting to sink in, I'm getting all kinds of
> ideas though (i.e. using the DACs for DDS, ...).
Great!
> I'm curious what the unpopulated J2001 can be used for. My assumption is
> that the VCTCXO signal can be fed out for synchronization purposes. I
> guess some small changes could also make that a clock input. I'm not
> sure whether I ever want to do that, but this could be helpful in a
> number of situations.
J2001 is a clock output if used as-is. It becomes a clock input if you remove
the crystal oscillator. You shouldn't need to do this unless you are doing
VLBI radio astronomy.
Matt