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On Jun 25, 2008, at 3:20 PM, Eric Blossom wrote:
On Wed, Jun 25, 2008 at 02:37:48PM -0700, Dan Halperin wrote:
1) I notice that multi-antenna.py claims to only work with the
BasicRX
boards. Any reason I can't use the 2 RX paths on each of 2 RFX2400s
assuming the d'board is powered up and configured correctly?
The RFX boards don't actually have two receive paths. They have two
antenna ports. The boards output analog I & Q to the usrp
motherboard, and thus two A/D's are required to handle each
daughterboard. With a single USRP and two RFX2400s you can handle two
inputs and two outputs.
So what you're saying is you can't use the TX/RX and the RX2 both for
receive at the same time? I guess that jives with the figure here:
http://gnuradio.org/trac/wiki/UsrpRfxDiagrams
Instead, that's only to enable concurrent transmit on TX and receive
on RX2... that doesn't exactly seem that useful.
2) I have a transmitter USRP and a receiver USRP attached to the same
machine. I use usrp.serial_number() as suggested by Eric in many
previous mails to distinguish between them. I have a code loop like
this:
Are you loading a different fpga image into the different USRPs?
Yes, one is (was, I guess?) using std_4rx_0tx.rbf (see 1) and the
other was using the default.
Thanks,
Dan
You can get the serial numbers without actually opening them by using
the low level usrp prims. Take a look at usrp/host/swig/prims.i
from usrpm import usrp_prims
def get_serial_number(which):
d = usrp_prims.usrp_find_device(which)
if not d:
raise RuntimeError, "Unable to find USRP #%d" % (which,)
if usrp_prims.usrp_unconfigured_usrp_p(d): # no
firmware loaded yet
usrp_prims.usrp_load_standard_bits(which, False) # load the
firmware
return usrp_prims.usrp_usrp_serial_number(d)
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