Hello,
I created a noise source and a tcp sink (server). I connect to it
with SDR# (on another machine) and get plenty of noise. Next I
created a signal source of 1khz and add that to my noise source. The
unexpected result: carriers all over the spectrum. None of which are
at 1khz.
You're probably having a good laugh. You're welcome.
I'd like to modulate the amplitude of a carrier and drop that into a
randomly-generated noise floor. And I'd like to stream the whole thing
to sdr-software across the network. Are my expectations too wild? Is
this possible?
Thanks for your time,
Ashworth
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WHat does the attached flow-graph produce for you?
My guess is that you have the amplitudes set so that they're saturating
whatever SDR# is doing with the I/Q signal from the TCP
channel, or that it's a typing/endianness issue.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Noise Signal
# Generated: Fri Nov 16 17:13:40 2012
##################################################
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import window
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from gnuradio.wxgui import fftsink2
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import wx
class noise_signal(grc_wxgui.top_block_gui):
def __init__(self):
grc_wxgui.top_block_gui.__init__(self, title="Noise Signal")
_icon_path = "/usr/share/icons/hicolor/32x32/apps/gnuradio-grc.png"
self.SetIcon(wx.Icon(_icon_path, wx.BITMAP_TYPE_ANY))
##################################################
# Variables
##################################################
self.samp_rate = samp_rate = 250e3
##################################################
# Blocks
##################################################
self.wxgui_fftsink2_0 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=0,
y_per_div=10,
y_divs=10,
ref_level=0,
ref_scale=2.0,
sample_rate=samp_rate,
fft_size=1024,
fft_rate=8,
average=False,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
self.Add(self.wxgui_fftsink2_0.win)
self.gr_throttle_0 = gr.throttle(gr.sizeof_gr_complex*1, samp_rate)
self.gr_sig_source_x_0 = gr.sig_source_c(samp_rate, gr.GR_COS_WAVE, 1000, 0.5, 0)
self.gr_noise_source_x_0 = gr.noise_source_c(gr.GR_GAUSSIAN, 0.1, 57)
self.gr_add_xx_0 = gr.add_vcc(1)
##################################################
# Connections
##################################################
self.connect((self.gr_noise_source_x_0, 0), (self.gr_add_xx_0, 0))
self.connect((self.gr_sig_source_x_0, 0), (self.gr_add_xx_0, 1))
self.connect((self.gr_add_xx_0, 0), (self.gr_throttle_0, 0))
self.connect((self.gr_throttle_0, 0), (self.wxgui_fftsink2_0, 0))
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.gr_sig_source_x_0.set_sampling_freq(self.samp_rate)
self.wxgui_fftsink2_0.set_sample_rate(self.samp_rate)
if __name__ == '__main__':
parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
(options, args) = parser.parse_args()
tb = noise_signal()
tb.Run(True)
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