Full-duplex WBX

Hi there,

Does anybody know how to configure WBX to work in full-duplex mode?

By running the “usrp2_fft.py”, it turned out that both TX/RX port and
RX2
port work for receiving.

Since TX and RX share the same port, how do we know if the WBX work in
half-duplex mode or in full-duplex mode?

Thanks.

-Evan

Or is there any document about full-duplex WBX?

I didn’t find the answer on the web.

-Evan

On 05/11/2010 07:18 AM, Evan Chen wrote:

and RX2 port work for receiving.
Since TX and RX share the same port, how do we know if the WBX work
in half-duplex mode or in full-duplex mode?
Thanks.
-Evan

It is just like the RFX-series. Use the TX/RX port for transmit, and
use the RX2 port for receive.

Matt

On Tue, May 11, 2010 at 10:19 AM, Matt E. [email protected] wrote:

Does anybody know how to configure WBX to work in full-duplex mode?
the RX2 port for receive.

Matt

Thanks, Matt.
I’m doing such a test:

The RX2 port of WBX is connected to the ouput of an AWG, which generates
a
sine signal. And the TX/RX port is connected to a DPO, so that the
transmitted signals can be captured on the screen. The output of the AWG
is
also connected to the DPO.

The USRP2 was simply powered on and no program was running.

On the DPO, the generated sine signal from AWG was observed, as
expected. *Moreover,
it was also observed that the TX/RX port of WBX was also transmitting
the
same waveform (sine signal) that was received on the RX2 port. *Is this
normal?

Evan

the RX2 port. *Is this normal?
Evan

I’m not sure what you think you are seeing, or what you could hope to
find out with such a test. It’s like saying “my computer doesn’t work”
when you haven’t loaded an operating system. I think what you are
seeing is an artifact of your measuring setup.

Why don’t you try actually running a program and see if it works?

Matt

Matt

If I want use one Antenna for RX-TX on WBX ?
I tried RXTX input and it have a lot less level on RX than RX2 … in
software i choose TXRX but always better level on RX2
why?

Thanks Serge

It is just like the RFX-series. Use the TX/RX port for transmit, and
use the RX2 port for receive.

Matt


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On Tue, Oct 5, 2010 at 5:46 AM, SergeNJ [email protected] wrote:

If I want use one Antenna for RX-TX on WBX ?
I tried RXTX input and it have a lot less level on RX than RX2 … in
software i choose TXRX but always better level on RX2
why?

Serge,

That should not be the case, but it is always possible there is a bug.
Can you give me a little more information to help track it down

Which version of GNUradio are you using?

USRP or USRP2?

If USRP2, which firmware (UHD, Raw Ethernet)? Which firmware version?

Are you sure you are not transmitting at the same time as receiving?
The antenna select logic will always connect the transmitter to TX/RX
port if you are transmitting, which means the receiver will see less
loss at the RX2 port

How are you supplying the antenna selection option (command line
option to usrp_fft.py, constructor argument, calling set_antenna
during streaming)?

Jason

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