hi,
When I run the code, I don’t receive error but >>uU<< appears on my
desktop.
I want to run a transmitter which transmits a file. I don’t see anything
around center frequency.
please somebody guide me. I am really confused.
the code is
#!/usr/bin/env python
from gnuradio import gr, gru, modulation_utils
from gnuradio import usrp
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from gnuradio import blks2impl
from gnuradio import blks2
import random, time, struct, sys
from current dir
#from transmit_path import transmit_path
#import fusb_options
def build_graph():
payload_bytesize = 16
mysamples_per_symbol = 3
myexcess_bw = 0.35
mygray_code = True
myverbose= False
mylog= False
txfreq = 2.5e9
interpolation = 16
chan = 1
gain = 1
fg = gr.top_block ()
#in this step we need to define the file we want to transmit
Bsrc = gr.file_source (gr.sizeof_char,
“/home/usrp2user/PDF/payload.pdf”, False)
Bframing = gr.simple_framer ( payload_bytesize )
Bdbpsk = blks2.dbpsk_mod(mysamples_per_symbol, myexcess_bw,
mygray_code, myverbose, mylog)
Bamp = gr.multiply_const_cc(8192)
Busrptx = usrp.sink_c(0)
Busrptx.set_interp_rate(interpolation)
subdev_spec = usrp.pick_tx_subdevice(Busrptx) # choose daughterboard
A as
your Tx.
Busrptx.set_mux(usrp.determine_tx_mux_value(Busrptx, subdev_spec))
subdev = usrp.selected_subdev(Busrptx,subdev_spec) # now we got the
chosen(last line) daughterboard
subdev.set_freq(txfreq)
subdev.set_enable(True) #enabling transmit :just in flex boards
x=subdev.gain_range()
subdev.set_gain(subdev.gain_range()[1])
#subdev.set_gain(gain)
Busrptx.tune(subdev._which, subdev, txfreq)
#usrp.sink_c.tune(Busrptx, chan, subdev, txfreq)
#usrp.sink_c.set_pga(0,pga_gain_in_db)
fg.connect(Bsrc, (Bframing, 0))
#fg.connect((Bframing, (Bdbpsk, 0))
#fg.connect((Bdbpsk, 1), Busrptx)
fg.connect(Bframing, Bdbpsk)
fg.connect(Bdbpsk, Bamp)
fg.connect(Bamp, Busrptx)
return fg
if name == ‘main’:
fg = build_graph ()
fg.run()
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