[Discuss-gnuradio] Difference between usrp in gnuradio and usrp in grc_gnuradio

[Songsong Gee]

I'm examining a GNU Radio Lab material:

Blad, Olofsson - 2011 - Software-Defined Radio Lab 1 Getting in Touch with GNU Radio and the USRP

This uses LFRX/LFTX daughterboards and the following codes for transmitting a signal (assume all variables are set correctly):

from gnuradio import usrp

# ... blahblah

subdev_spec = (0,0)

subdev = self.u.selected_subdev(subdev_spec)

self.u.set_mux(self.u.determine_tx_mux_value(subdev_spec))

self.u.tune(0, subdev, carrier)

subdev.set_gain(0)

Currently, however, I wanted to modify this codes for a RFX2400 daughterboard, and when I use that codes without any changes, it doesn't work

I cannot see anything but noise with usrp_fft.py. Thus, I changed the codes with the following:

from grc_gnuradio import usrp as grc_usrp

# ... blahblah

self.usrp_simple_sink_x_0 = grc_usrp.simple_sink_c(which=0, side="A")

self.usrp_simple_sink_x_0.set_interp_rate(500)

self.usrp_simple_sink_x_0.set_frequency(2.412*(10**9), verbose=False)

self.usrp_simple_sink_x_0.set_gain(0)

self.usrp_simple_sink_x_0.set_enable(True)

self.usrp_simple_sink_x_0.set_auto_tr(True)

And then it finally works fine.

Is there any difference between using usrp in gnuradio and usrp in grc_gnuradio ?

And the former code is only working for LFRX/LFTX ? and the latter one is working for other ones?

--

Seokseong Jeon, PhD Candidate

Communication & Networks Lab

IT Convergence Engineering (ITCE), POSTECH, Korea

+82 10 8338 1229, gee.songsong at gmail . com