Multi-antenna example

Hi all,

I got my USRP up and running just fine after a fresh install of Suse
10.1I’m working on a “walkthrough” that describes some of the problems
I
encountered; I’d be happy to add it to the Wiki if anybody is
interested.

After running the USB benchmark (32M, no problem) and seeing the FFT
display
work, just for fun I attached an antenna directly to my basic RX and
keyed
an FRS radio nearby. No problem seeing the 465 MHz FM signal pop up.
Very
cool.

Now for the only problem I’ve encountered. I have two basic RX cards
installed, and I’m injecting a single signal into the “RX-A” input of
the A
side card at a level of about 45 dBm or so. I run the multi-antenna
capture
to file code with maximum decimation (256) and software filtering turned
off
for a 50 millisecond collect. I then look at the spectrum of the
resulting
four files with MATLAB (sorry!). I see my carrier in both channels 0 and
1
(but not 3 or 4) at nearly the same level. I didn’t see any error
messages
during the collect; is it possible that the software couldn’t keep up
with
the data and got out of sync? I’m going to try writing some test code
to
pull in the data to memory before writing out to disk next. Any
thoughts?

Best regards,

Mark S.

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