Is there a way to grab the bandwidth of the daughterboard?

I’m creating a new fm demodulator based on usrp_rx_nogui, and in the
interest of modularity I’d like to grab the width of frequency being
captured off the daughterboard (in my case the TVRX, which I think is
about
6MHz?)

in an fm example I’ve been referring to, for example, you do this:

# set front end gain
rf_front_end.set_AGC (300)
IF_freq = rf_front_end.get_output_freq ()
IF_freq = 5.75e6

but obviously even there they hardcode the IF_freq. Is there anything I
can
do, or should I just hardcode it, and add an option letting people
change
it?

On Thu, Aug 06, 2009 at 04:45:32PM -0400, Jonathan C. wrote:

IF_freq = 5.75e6

but obviously even there they hardcode the IF_freq. Is there anything I can
do, or should I just hardcode it, and add an option letting people change
it?

I suggest you start with
gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py.

In general there’s no need to know the center of the IF coming off
of the daughterboard. u.tune(…) does the right thing and translates
your desired frequency to baseband (0 Hz).

There’s currently no way to query for the usable IF bandwidth of any
of the daughterboards. You are correct in that the usable bandwidth
on the TVRX is about 6 MHz.

Eric

Gotcha, thanks. I just made a custom flag for it. And indeed,
wfm_rxv_nogui
looks simpler and more specific to my purposes. I need it because my
goal is
to demodulate various FM signals within the sampled bandwidth.

2009/8/6 Eric B. [email protected]

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