FLEX900 RX2 Port

GNU Radio
1

Hello,

I am trying to run a loopback test where I am using the USRP2 and the
FLEX900
daughter board. I have connected the TX/RX port directly to the RX2
port. I am running
usrp2_siggen.py as is (presumably transmitting out the TX/RX port) and
then
also running usrp2_fft.py. I tried to modify usrp2_fft.py so that I
could switch the
receive port to RX2 as follows “self.subdev.select_rx_antenna(‘RX2’)” -
actually
pretty much just uncommented out the code that was already there.
However
this does not seem to work. I wonder is there anyway that I can preform
the test
I want to. Is there anyway to get the USRP2 to transmit out TX/RX and
at the
same time receive from port RX2…any help would be greatly appreciated.

Thanks,
Sharif

2

On 02/18/2010 11:38 AM, Sharif S. wrote:

actually
pretty much just uncommented out the code that was already there. However
this does not seem to work. I wonder is there anyway that I can preform
the test
I want to. Is there anyway to get the USRP2 to transmit out TX/RX and at
the
same time receive from port RX2…any help would be greatly appreciated.

Yes, you can do full duplex, but you should not connect the ports
directly or you will blow out the receiver. There will be enough
leakage that you can just put attenuators.

Matt

3

Hi Matt,

Thanks for the advice, but might you know how I can configure
usrp2_fft.py to
use port RX2, as i had mentioned, augmenting usrp2_fft.py in the fashion
I described does not work. For that matter, might you know in general
how
to direct reception to RX2 instead of TX/RX which I believe is the
default.

Thanks,
Sharif

4

Hi,

From: Matt E. [email protected]

Yes, you can do full duplex, but you should not connect the ports
directly or you will blow out the receiver. There will be enough
leakage that you can just put attenuators.

Matt

Is USRP2 Antenna selection (TX/RX , RX2) works for the current firmware
?

Best Regards,

Firas

5

On 02/19/2010 11:21 PM, Firas A. wrote:

Matt

Is USRP2 Antenna selection (TX/RX , RX2) works for the current firmware ?

We need to get that in there in a convenient way for the users. We’re
working on it now.

Matt