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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

> 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, ...).


> 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.


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