Re: [Discuss-gnuradio] FLEX900 RX2 Port

[Sharif Shaher]

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

Matt Ettus wrote:
> On 02/18/2010 11:38 AM, Sharif Shaher wrote:
> > 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.
>
>
> 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