USRPs have a feature that will toggle GPIOs based on their Tx/Rx state.
Your device (if it's not a USRP) might have something similar.

Cheers,
M

On 11/28/2016 03:11 PM, Dan CaJacob wrote:
> This is possible.  You'd write a custom block to do this.  You could
> even do a simple POC with a python block, though it wouldn't be very
> fast for T/R functionality.
> 
> On Mon, Nov 28, 2016 at 3:08 PM Bob Mattaliano <n6r...@gmail.com
> <mailto:n6r...@gmail.com>> wrote:
> 
>     Hi,
> 
>     Pretty new to GNUradio, GRC and Linux.  Does anyone have experience with
>     or know if possible to create a flow graph or block to switch a USB
>     relay (as in the kind used for home automation)?
> 
>       What I am interested in is a block or flowgraph which examines output
>     which also goes to the the monitor window.  If a specific string is not
>     observed, a signal will be sent to switch the relay for a defined
>     period.  The goal is some sort of automated antenna polarity switching
>     depending on what is (or is not) received.
> 
>     Suggestions welcome.
> 
>     Thanks,
> 
>     Bob
>     N6RFM
> 
> 
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> 
> -- 
> Very Respectfully,
> 
> Dan CaJacob
> 
> 
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