Re: [Discuss-gnuradio] How can I externally trigger USRP2?

[Matt Ettus]

Jakob Meineke wrote:
> Hi,
>
> in our lab we want to use a USRP2 to generate an RF-signal starting at a
> given time in our experimental sequence. While the generation of the signal
> works fine, in order to do this we need to be able to externally trigger the
> start of the sequence. We basically want to start the transmission of the
> data to the USRP2 from the host but the USRP2 starts transmitting only after
> it has received a TTL signal or the like from somewhere else. I would very
> much appreciate any hints on how to implement this. Cheers,

The best way to do this is to use the 1 PPS input.  You can modify the 
FPGA code to make it into a trigger signal, or use it in any way you like.

Matt