Re: USRP B210 TX/RX switching between transmitting and receiving

[okan erturk]

So TX has a priority over RX, am I right?

On Tue, Jan 10, 2023, 21:54 Daniel Estévez <daniel@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.