Forum: GNU Radio How can I externally trigger USRP2?

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Jakob Meineke (Guest)
on 2009-02-27 17:44
(Received via mailing list)
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,

Jakob
Matt E. (Guest)
on 2009-02-27 20:54
(Received via mailing list)
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
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