Varying signal with usrp_rx_cfile

I’m trying to save a signal to a file coming from a signal generator.
The logical starting point is to use the program usrp_rx_cfile.py. After
I put in the center frequency, I would like to vary the signal to view
how it changes with time (via Matlab) but no matter how many samples or
throttling I do, the signal never changes. The frequency that repeats
over the number of samples is the initial one I start with. Is there a
way to make this work? It seems very simple, maybe I’m missing
something?

Thanks,

Randy

What command line options are you using with usrp_rx_cfile.py? Can you
send us an example of what you’re executing on the command line?