On 10/01/2023 14:01, okan erturk wrote:
So TX has a priority over RX, am I right?
Not sure what you mean by "priority".
The RX/TX port will be connected to the TX whenever it's transmitting.
The RX chain can either be connected to the RX2 port all the time, or if
it's configured for
TX/RX, the ATR (Automatic Transmit Receive) logic in the FPGA will
switch the RX chain
between the TX/RX and RX2 ports whenever there's an active transmission.
In the case of Karen's flow-graph, it transmits all the time, so the RX
chain will be switched
to the RX2 antenna port, regardless of what its preferred antenna
setting is.
Now, IN ADDITION to all of this, since the maximum isolation between
antenna ports is not
super high, the RX chain WILL SEE YOUR TRANSMISSIONS. You just need
to be prepared for
that.
On Tue, Jan 10, 2023, 21:54 Daniel Estévez <dan...@destevez.net> wrote:
On 09/01/2023 18:20, Karen young wrote:
> Hi,
>
> I want to use the single port (TX/RX) from USRP B210 to switch
between
> transmitting and receiving. I have selected "Ch0: Antenna:
TX/RX" for
> both the USRP sink and source blocks as shown in the figure. I
expect
> the TX/RX port will show orange light. But the USRP hardware still
> transmits through TX/RX port (Red light on), and receives
through RX2
> port (Green light on).
>
> What needs to be set if only using a single TX/RX port for
switching
> between transmitting and receiving?
Hi Karen,
It seems that you're trying to transmit continuously, since the
Signal
Source is delivering samples to the USRP sink all the time. The TX/RX
port cannot be used for simultaneous transmit and receive. It can
only
do one at a time (but can switch during the flowgraph execution).
To receive whenever you are not transmitting something, you need
to use
burst transmissions
(https://wiki.gnuradio.org/index.php/USRP_Sink#Bursty_Transmission).
I
think that if you do this, the USRP will switch to transmit when you
send it a burst, and will switch to receive whenever it has
nothing to
transmit.
Best,
Daniel.
