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Re: [Discuss-gnuradio] [USRP-users] Can use WBX to receive dual channel?
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From: |
Scott Johnston |
|
Subject: |
Re: [Discuss-gnuradio] [USRP-users] Can use WBX to receive dual channel? |
|
Date: |
Fri, 13 Jan 2012 14:59:14 -0500 |
|
User-agent: |
Thunderbird 2.0.0.24 (X11/20100721) |
Hi Josh,
I am attempting to do what you described below, but I am seeing two
problems. First, I see a power difference of about 30 dB going from one
channel to two. Second, when I tune the second channel 100kHz away from
the first, the first channel moves 100kHz and the second moves by 200kHz.
The one_channel picture is from the standard uhd_fft.grc in the examples
folder. I am generating the signal by using an FRS walky-talky.
Thanks for any help
Scott
Josh Blum wrote:
On 09/08/2011 11:10 PM, Luong Tan Phong wrote:
twHi,
Could you tell me how to use WBX daughter board to receive two difference
signal?
Set the rx subdev spec to "A:0 A:0". This will map the WBX receiver to
DSP0 and DSP1.
http://files.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1multi__usrp.html#a7f94ed00059cc7dd30567d031b3f9679
Then tune each channel. You will have to use the same LO frequency with
different frequency offsets for each DSP.
http://files.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1multi__usrp.html#a9b61448f392466e20572fdcb042e8ec6
-josh
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#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Top Block
# Generated: Fri Jan 13 14:39:08 2012
##################################################
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import uhd
from gnuradio import window
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from gnuradio.wxgui import fftsink2
from gnuradio.wxgui import forms
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import wx
class top_block(grc_wxgui.top_block_gui):
def __init__(self, gain=0, address="addr=192.168.20.2", freq=467.6e6,
samp_rate=1e6):
grc_wxgui.top_block_gui.__init__(self, title="Top Block")
##################################################
# Parameters
##################################################
self.gain = gain
self.address = address
self.freq = freq
self.samp_rate = samp_rate
##################################################
# Variables
##################################################
self.tun_gain = tun_gain = gain
self.tun_freq = tun_freq = freq
##################################################
# Blocks
##################################################
_tun_gain_sizer = wx.BoxSizer(wx.VERTICAL)
self._tun_gain_text_box = forms.text_box(
parent=self.GetWin(),
sizer=_tun_gain_sizer,
value=self.tun_gain,
callback=self.set_tun_gain,
label="UHD Gain",
converter=forms.float_converter(),
proportion=0,
)
self._tun_gain_slider = forms.slider(
parent=self.GetWin(),
sizer=_tun_gain_sizer,
value=self.tun_gain,
callback=self.set_tun_gain,
minimum=0,
maximum=20,
num_steps=100,
style=wx.SL_HORIZONTAL,
cast=float,
proportion=1,
)
self.Add(_tun_gain_sizer)
_tun_freq_sizer = wx.BoxSizer(wx.VERTICAL)
self._tun_freq_text_box = forms.text_box(
parent=self.GetWin(),
sizer=_tun_freq_sizer,
value=self.tun_freq,
callback=self.set_tun_freq,
label="UHD Freq (Hz)",
converter=forms.float_converter(),
proportion=0,
)
self._tun_freq_slider = forms.slider(
parent=self.GetWin(),
sizer=_tun_freq_sizer,
value=self.tun_freq,
callback=self.set_tun_freq,
minimum=freq*.8,
maximum=freq*1.2,
num_steps=100,
style=wx.SL_HORIZONTAL,
cast=float,
proportion=1,
)
self.Add(_tun_freq_sizer)
self.wxgui_fftsink2_0_0 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=tun_freq,
y_per_div=10,
y_divs=10,
ref_level=10,
ref_scale=2.0,
sample_rate=samp_rate,
fft_size=1024*2,
fft_rate=2,
average=False,
avg_alpha=None,
title="FFT Plot 2",
peak_hold=False,
)
self.Add(self.wxgui_fftsink2_0_0.win)
self.wxgui_fftsink2_0 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=tun_freq,
y_per_div=10,
y_divs=10,
ref_level=10,
ref_scale=2.0,
sample_rate=samp_rate,
fft_size=1024*2,
fft_rate=2,
average=False,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
self.Add(self.wxgui_fftsink2_0.win)
self.uhd_usrp_source_0 = uhd.usrp_source(
device_addr=address,
stream_args=uhd.stream_args(
cpu_format="fc32",
channels=range(2),
),
)
self.uhd_usrp_source_0.set_clock_source("external", 0)
self.uhd_usrp_source_0.set_subdev_spec("A:0 A:0", 0)
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
self.uhd_usrp_source_0.set_center_freq(uhd.tune_request(tun_freq,
dsp_freq=-10e6, rf_freq=tun_freq+10e6,
dsp_freq_policy=uhd.tune_request.POLICY_MANUAL,rf_freq_policy=uhd.tune_request.POLICY_MANUAL),
0)
self.uhd_usrp_source_0.set_gain(tun_gain, 0)
self.uhd_usrp_source_0.set_center_freq(uhd.tune_request(tun_freq-.1e6,
dsp_freq=-10.1e6, rf_freq=tun_freq+10e6,
dsp_freq_policy=uhd.tune_request.POLICY_MANUAL,rf_freq_policy=uhd.tune_request.POLICY_MANUAL),
1)
self.uhd_usrp_source_0.set_gain(tun_gain, 1)
##################################################
# Connections
##################################################
self.connect((self.uhd_usrp_source_0, 0),
(self.wxgui_fftsink2_0, 0))
self.connect((self.uhd_usrp_source_0, 1),
(self.wxgui_fftsink2_0_0, 0))
def get_gain(self):
return self.gain
def set_gain(self, gain):
self.gain = gain
self.set_tun_gain(self.gain)
def get_address(self):
return self.address
def set_address(self, address):
self.address = address
def get_freq(self):
return self.freq
def set_freq(self, freq):
self.freq = freq
self.set_tun_freq(self.freq)
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.wxgui_fftsink2_0.set_sample_rate(self.samp_rate)
self.wxgui_fftsink2_0_0.set_sample_rate(self.samp_rate)
self.uhd_usrp_source_0.set_samp_rate(self.samp_rate)
def get_tun_gain(self):
return self.tun_gain
def set_tun_gain(self, tun_gain):
self.tun_gain = tun_gain
self._tun_gain_slider.set_value(self.tun_gain)
self._tun_gain_text_box.set_value(self.tun_gain)
self.uhd_usrp_source_0.set_gain(self.tun_gain, 0)
self.uhd_usrp_source_0.set_gain(self.tun_gain, 1)
def get_tun_freq(self):
return self.tun_freq
def set_tun_freq(self, tun_freq):
self.tun_freq = tun_freq
self.wxgui_fftsink2_0.set_baseband_freq(self.tun_freq)
self.wxgui_fftsink2_0_0.set_baseband_freq(self.tun_freq)
self._tun_freq_slider.set_value(self.tun_freq)
self._tun_freq_text_box.set_value(self.tun_freq)
self.uhd_usrp_source_0.set_center_freq(uhd.tune_request(self.tun_freq,
dsp_freq=-10e6, rf_freq=self.tun_freq+10e6,
dsp_freq_policy=uhd.tune_request.POLICY_MANUAL,rf_freq_policy=uhd.tune_request.POLICY_MANUAL),
0)
self.uhd_usrp_source_0.set_center_freq(uhd.tune_request(self.tun_freq-.1e6,
dsp_freq=-10.1e6, rf_freq=self.tun_freq+10e6,
dsp_freq_policy=uhd.tune_request.POLICY_MANUAL,rf_freq_policy=uhd.tune_request.POLICY_MANUAL),
1)
if __name__ == '__main__':
parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
parser.add_option("-g", "--gain", dest="gain", type="eng_float",
default=eng_notation.num_to_str(0),
help="Set Default Gain [default=%default]")
parser.add_option("-a", "--address", dest="address", type="string",
default="addr=192.168.20.2",
help="Set IP Address [default=%default]")
parser.add_option("-f", "--freq", dest="freq", type="eng_float",
default=eng_notation.num_to_str(467.6e6),
help="Set Default Frequency [default=%default]")
parser.add_option("-s", "--samp-rate", dest="samp_rate",
type="eng_float", default=eng_notation.num_to_str(1e6),
help="Set Sample Rate [default=%default]")
(options, args) = parser.parse_args()
tb = top_block(gain=options.gain, address=options.address,
freq=options.freq, samp_rate=options.samp_rate)
tb.Run(True)
<?xml version='1.0' encoding='ASCII'?>
<flow_graph>
<timestamp>Fri Jan 13 14:36:38 2012</timestamp>
<block>
<key>options</key>
<param>
<key>id</key>
<value>top_block</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>title</key>
<value></value>
</param>
<param>
<key>author</key>
<value></value>
</param>
<param>
<key>description</key>
<value></value>
</param>
<param>
<key>window_size</key>
<value>1280, 1024</value>
</param>
<param>
<key>generate_options</key>
<value>wx_gui</value>
</param>
<param>
<key>category</key>
<value>Custom</value>
</param>
<param>
<key>run_options</key>
<value>prompt</value>
</param>
<param>
<key>run</key>
<value>True</value>
</param>
<param>
<key>realtime_scheduling</key>
<value></value>
</param>
<param>
<key>_coordinate</key>
<value>(10, 10)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>parameter</key>
<param>
<key>id</key>
<value>gain</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>label</key>
<value>Default Gain</value>
</param>
<param>
<key>value</key>
<value>0</value>
</param>
<param>
<key>type</key>
<value>eng_float</value>
</param>
<param>
<key>short_id</key>
<value>g</value>
</param>
<param>
<key>_coordinate</key>
<value>(889.5, 168.75)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>variable_slider</key>
<param>
<key>id</key>
<value>tun_gain</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>label</key>
<value>UHD Gain</value>
</param>
<param>
<key>value</key>
<value>gain</value>
</param>
<param>
<key>min</key>
<value>0</value>
</param>
<param>
<key>max</key>
<value>20</value>
</param>
<param>
<key>num_steps</key>
<value>100</value>
</param>
<param>
<key>style</key>
<value>wx.SL_HORIZONTAL</value>
</param>
<param>
<key>converver</key>
<value>float_converter</value>
</param>
<param>
<key>grid_pos</key>
<value></value>
</param>
<param>
<key>notebook</key>
<value></value>
</param>
<param>
<key>_coordinate</key>
<value>(433.5, 528.75)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>parameter</key>
<param>
<key>id</key>
<value>address</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>label</key>
<value>IP Address</value>
</param>
<param>
<key>value</key>
<value>addr=192.168.20.2</value>
</param>
<param>
<key>type</key>
<value>string</value>
</param>
<param>
<key>short_id</key>
<value>a</value>
</param>
<param>
<key>_coordinate</key>
<value>(461.5, 167.75)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>wxgui_fftsink2</key>
<param>
<key>id</key>
<value>wxgui_fftsink2_0</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>type</key>
<value>complex</value>
</param>
<param>
<key>title</key>
<value>FFT Plot</value>
</param>
<param>
<key>samp_rate</key>
<value>samp_rate</value>
</param>
<param>
<key>baseband_freq</key>
<value>tun_freq</value>
</param>
<param>
<key>y_per_div</key>
<value>10</value>
</param>
<param>
<key>y_divs</key>
<value>10</value>
</param>
<param>
<key>ref_level</key>
<value>10</value>
</param>
<param>
<key>ref_scale</key>
<value>2.0</value>
</param>
<param>
<key>fft_size</key>
<value>1024*2</value>
</param>
<param>
<key>fft_rate</key>
<value>2</value>
</param>
<param>
<key>peak_hold</key>
<value>False</value>
</param>
<param>
<key>average</key>
<value>False</value>
</param>
<param>
<key>avg_alpha</key>
<value>0</value>
</param>
<param>
<key>win</key>
<value>None</value>
</param>
<param>
<key>win_size</key>
<value></value>
</param>
<param>
<key>grid_pos</key>
<value></value>
</param>
<param>
<key>notebook</key>
<value></value>
</param>
<param>
<key>_coordinate</key>
<value>(764, 285)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>parameter</key>
<param>
<key>id</key>
<value>freq</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>label</key>
<value>Default Frequency</value>
</param>
<param>
<key>value</key>
<value>467.6e6</value>
</param>
<param>
<key>type</key>
<value>eng_float</value>
</param>
<param>
<key>short_id</key>
<value>f</value>
</param>
<param>
<key>_coordinate</key>
<value>(741.5, 169.75)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>parameter</key>
<param>
<key>id</key>
<value>samp_rate</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>label</key>
<value>Sample Rate</value>
</param>
<param>
<key>value</key>
<value>1e6</value>
</param>
<param>
<key>type</key>
<value>eng_float</value>
</param>
<param>
<key>short_id</key>
<value>s</value>
</param>
<param>
<key>_coordinate</key>
<value>(615.5, 169.75)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>wxgui_fftsink2</key>
<param>
<key>id</key>
<value>wxgui_fftsink2_0_0</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>type</key>
<value>complex</value>
</param>
<param>
<key>title</key>
<value>FFT Plot 2</value>
</param>
<param>
<key>samp_rate</key>
<value>samp_rate</value>
</param>
<param>
<key>baseband_freq</key>
<value>tun_freq</value>
</param>
<param>
<key>y_per_div</key>
<value>10</value>
</param>
<param>
<key>y_divs</key>
<value>10</value>
</param>
<param>
<key>ref_level</key>
<value>10</value>
</param>
<param>
<key>ref_scale</key>
<value>2.0</value>
</param>
<param>
<key>fft_size</key>
<value>1024*2</value>
</param>
<param>
<key>fft_rate</key>
<value>2</value>
</param>
<param>
<key>peak_hold</key>
<value>False</value>
</param>
<param>
<key>average</key>
<value>False</value>
</param>
<param>
<key>avg_alpha</key>
<value>0</value>
</param>
<param>
<key>win</key>
<value>None</value>
</param>
<param>
<key>win_size</key>
<value></value>
</param>
<param>
<key>grid_pos</key>
<value></value>
</param>
<param>
<key>notebook</key>
<value></value>
</param>
<param>
<key>_coordinate</key>
<value>(754, 457)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>variable_slider</key>
<param>
<key>id</key>
<value>tun_freq</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>label</key>
<value>UHD Freq (Hz)</value>
</param>
<param>
<key>value</key>
<value>freq</value>
</param>
<param>
<key>min</key>
<value>freq*.8</value>
</param>
<param>
<key>max</key>
<value>freq*1.2</value>
</param>
<param>
<key>num_steps</key>
<value>100</value>
</param>
<param>
<key>style</key>
<value>wx.SL_HORIZONTAL</value>
</param>
<param>
<key>converver</key>
<value>float_converter</value>
</param>
<param>
<key>grid_pos</key>
<value></value>
</param>
<param>
<key>notebook</key>
<value></value>
</param>
<param>
<key>_coordinate</key>
<value>(292.5, 527.75)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<block>
<key>uhd_usrp_source</key>
<param>
<key>id</key>
<value>uhd_usrp_source_0</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>type</key>
<value>fc32</value>
</param>
<param>
<key>otw</key>
<value></value>
</param>
<param>
<key>stream_args</key>
<value></value>
</param>
<param>
<key>dev_addr</key>
<value>address</value>
</param>
<param>
<key>sync</key>
<value></value>
</param>
<param>
<key>clock_rate</key>
<value>0.0</value>
</param>
<param>
<key>num_mboards</key>
<value>1</value>
</param>
<param>
<key>clock_source0</key>
<value>external</value>
</param>
<param>
<key>time_source0</key>
<value></value>
</param>
<param>
<key>sd_spec0</key>
<value>A:0 A:0</value>
</param>
<param>
<key>clock_source1</key>
<value></value>
</param>
<param>
<key>time_source1</key>
<value></value>
</param>
<param>
<key>sd_spec1</key>
<value></value>
</param>
<param>
<key>clock_source2</key>
<value></value>
</param>
<param>
<key>time_source2</key>
<value></value>
</param>
<param>
<key>sd_spec2</key>
<value></value>
</param>
<param>
<key>clock_source3</key>
<value></value>
</param>
<param>
<key>time_source3</key>
<value></value>
</param>
<param>
<key>sd_spec3</key>
<value></value>
</param>
<param>
<key>clock_source4</key>
<value></value>
</param>
<param>
<key>time_source4</key>
<value></value>
</param>
<param>
<key>sd_spec4</key>
<value></value>
</param>
<param>
<key>clock_source5</key>
<value></value>
</param>
<param>
<key>time_source5</key>
<value></value>
</param>
<param>
<key>sd_spec5</key>
<value></value>
</param>
<param>
<key>clock_source6</key>
<value></value>
</param>
<param>
<key>time_source6</key>
<value></value>
</param>
<param>
<key>sd_spec6</key>
<value></value>
</param>
<param>
<key>clock_source7</key>
<value></value>
</param>
<param>
<key>time_source7</key>
<value></value>
</param>
<param>
<key>sd_spec7</key>
<value></value>
</param>
<param>
<key>nchan</key>
<value>2</value>
</param>
<param>
<key>samp_rate</key>
<value>samp_rate</value>
</param>
<param>
<key>center_freq0</key>
<value>uhd.tune_request(tun_freq, dsp_freq=-10e6, rf_freq=tun_freq+10e6,
dsp_freq_policy=uhd.tune_request.POLICY_MANUAL,rf_freq_policy=uhd.tune_request.POLICY_MANUAL)</value>
</param>
<param>
<key>gain0</key>
<value>tun_gain</value>
</param>
<param>
<key>ant0</key>
<value></value>
</param>
<param>
<key>bw0</key>
<value>0</value>
</param>
<param>
<key>center_freq1</key>
<value>uhd.tune_request(tun_freq-.1e6, dsp_freq=-10.1e6,
rf_freq=tun_freq+10e6,
dsp_freq_policy=uhd.tune_request.POLICY_MANUAL,rf_freq_policy=uhd.tune_request.POLICY_MANUAL)</value>
</param>
<param>
<key>gain1</key>
<value>tun_gain</value>
</param>
<param>
<key>ant1</key>
<value></value>
</param>
<param>
<key>bw1</key>
<value>0</value>
</param>
<param>
<key>center_freq2</key>
<value>0</value>
</param>
<param>
<key>gain2</key>
<value>0</value>
</param>
<param>
<key>ant2</key>
<value></value>
</param>
<param>
<key>bw2</key>
<value>0</value>
</param>
<param>
<key>center_freq3</key>
<value>0</value>
</param>
<param>
<key>gain3</key>
<value>0</value>
</param>
<param>
<key>ant3</key>
<value></value>
</param>
<param>
<key>bw3</key>
<value>0</value>
</param>
<param>
<key>center_freq4</key>
<value>0</value>
</param>
<param>
<key>gain4</key>
<value>0</value>
</param>
<param>
<key>ant4</key>
<value></value>
</param>
<param>
<key>bw4</key>
<value>0</value>
</param>
<param>
<key>center_freq5</key>
<value>0</value>
</param>
<param>
<key>gain5</key>
<value>0</value>
</param>
<param>
<key>ant5</key>
<value></value>
</param>
<param>
<key>bw5</key>
<value>0</value>
</param>
<param>
<key>center_freq6</key>
<value>0</value>
</param>
<param>
<key>gain6</key>
<value>0</value>
</param>
<param>
<key>ant6</key>
<value></value>
</param>
<param>
<key>bw6</key>
<value>0</value>
</param>
<param>
<key>center_freq7</key>
<value>0</value>
</param>
<param>
<key>gain7</key>
<value>0</value>
</param>
<param>
<key>ant7</key>
<value></value>
</param>
<param>
<key>bw7</key>
<value>0</value>
</param>
<param>
<key>center_freq8</key>
<value>0</value>
</param>
<param>
<key>gain8</key>
<value>0</value>
</param>
<param>
<key>ant8</key>
<value></value>
</param>
<param>
<key>bw8</key>
<value>0</value>
</param>
<param>
<key>center_freq9</key>
<value>0</value>
</param>
<param>
<key>gain9</key>
<value>0</value>
</param>
<param>
<key>ant9</key>
<value></value>
</param>
<param>
<key>bw9</key>
<value>0</value>
</param>
<param>
<key>center_freq10</key>
<value>0</value>
</param>
<param>
<key>gain10</key>
<value>0</value>
</param>
<param>
<key>ant10</key>
<value></value>
</param>
<param>
<key>bw10</key>
<value>0</value>
</param>
<param>
<key>center_freq11</key>
<value>0</value>
</param>
<param>
<key>gain11</key>
<value>0</value>
</param>
<param>
<key>ant11</key>
<value></value>
</param>
<param>
<key>bw11</key>
<value>0</value>
</param>
<param>
<key>center_freq12</key>
<value>0</value>
</param>
<param>
<key>gain12</key>
<value>0</value>
</param>
<param>
<key>ant12</key>
<value></value>
</param>
<param>
<key>bw12</key>
<value>0</value>
</param>
<param>
<key>center_freq13</key>
<value>0</value>
</param>
<param>
<key>gain13</key>
<value>0</value>
</param>
<param>
<key>ant13</key>
<value></value>
</param>
<param>
<key>bw13</key>
<value>0</value>
</param>
<param>
<key>center_freq14</key>
<value>0</value>
</param>
<param>
<key>gain14</key>
<value>0</value>
</param>
<param>
<key>ant14</key>
<value></value>
</param>
<param>
<key>bw14</key>
<value>0</value>
</param>
<param>
<key>center_freq15</key>
<value>0</value>
</param>
<param>
<key>gain15</key>
<value>0</value>
</param>
<param>
<key>ant15</key>
<value></value>
</param>
<param>
<key>bw15</key>
<value>0</value>
</param>
<param>
<key>center_freq16</key>
<value>0</value>
</param>
<param>
<key>gain16</key>
<value>0</value>
</param>
<param>
<key>ant16</key>
<value></value>
</param>
<param>
<key>bw16</key>
<value>0</value>
</param>
<param>
<key>center_freq17</key>
<value>0</value>
</param>
<param>
<key>gain17</key>
<value>0</value>
</param>
<param>
<key>ant17</key>
<value></value>
</param>
<param>
<key>bw17</key>
<value>0</value>
</param>
<param>
<key>center_freq18</key>
<value>0</value>
</param>
<param>
<key>gain18</key>
<value>0</value>
</param>
<param>
<key>ant18</key>
<value></value>
</param>
<param>
<key>bw18</key>
<value>0</value>
</param>
<param>
<key>center_freq19</key>
<value>0</value>
</param>
<param>
<key>gain19</key>
<value>0</value>
</param>
<param>
<key>ant19</key>
<value></value>
</param>
<param>
<key>bw19</key>
<value>0</value>
</param>
<param>
<key>center_freq20</key>
<value>0</value>
</param>
<param>
<key>gain20</key>
<value>0</value>
</param>
<param>
<key>ant20</key>
<value></value>
</param>
<param>
<key>bw20</key>
<value>0</value>
</param>
<param>
<key>center_freq21</key>
<value>0</value>
</param>
<param>
<key>gain21</key>
<value>0</value>
</param>
<param>
<key>ant21</key>
<value></value>
</param>
<param>
<key>bw21</key>
<value>0</value>
</param>
<param>
<key>center_freq22</key>
<value>0</value>
</param>
<param>
<key>gain22</key>
<value>0</value>
</param>
<param>
<key>ant22</key>
<value></value>
</param>
<param>
<key>bw22</key>
<value>0</value>
</param>
<param>
<key>center_freq23</key>
<value>0</value>
</param>
<param>
<key>gain23</key>
<value>0</value>
</param>
<param>
<key>ant23</key>
<value></value>
</param>
<param>
<key>bw23</key>
<value>0</value>
</param>
<param>
<key>center_freq24</key>
<value>0</value>
</param>
<param>
<key>gain24</key>
<value>0</value>
</param>
<param>
<key>ant24</key>
<value></value>
</param>
<param>
<key>bw24</key>
<value>0</value>
</param>
<param>
<key>center_freq25</key>
<value>0</value>
</param>
<param>
<key>gain25</key>
<value>0</value>
</param>
<param>
<key>ant25</key>
<value></value>
</param>
<param>
<key>bw25</key>
<value>0</value>
</param>
<param>
<key>center_freq26</key>
<value>0</value>
</param>
<param>
<key>gain26</key>
<value>0</value>
</param>
<param>
<key>ant26</key>
<value></value>
</param>
<param>
<key>bw26</key>
<value>0</value>
</param>
<param>
<key>center_freq27</key>
<value>0</value>
</param>
<param>
<key>gain27</key>
<value>0</value>
</param>
<param>
<key>ant27</key>
<value></value>
</param>
<param>
<key>bw27</key>
<value>0</value>
</param>
<param>
<key>center_freq28</key>
<value>0</value>
</param>
<param>
<key>gain28</key>
<value>0</value>
</param>
<param>
<key>ant28</key>
<value></value>
</param>
<param>
<key>bw28</key>
<value>0</value>
</param>
<param>
<key>center_freq29</key>
<value>0</value>
</param>
<param>
<key>gain29</key>
<value>0</value>
</param>
<param>
<key>ant29</key>
<value></value>
</param>
<param>
<key>bw29</key>
<value>0</value>
</param>
<param>
<key>center_freq30</key>
<value>0</value>
</param>
<param>
<key>gain30</key>
<value>0</value>
</param>
<param>
<key>ant30</key>
<value></value>
</param>
<param>
<key>bw30</key>
<value>0</value>
</param>
<param>
<key>center_freq31</key>
<value>0</value>
</param>
<param>
<key>gain31</key>
<value>0</value>
</param>
<param>
<key>ant31</key>
<value></value>
</param>
<param>
<key>bw31</key>
<value>0</value>
</param>
<param>
<key>_coordinate</key>
<value>(468.5, 367.75)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
</block>
<connection>
<source_block_id>uhd_usrp_source_0</source_block_id>
<sink_block_id>wxgui_fftsink2_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>uhd_usrp_source_0</source_block_id>
<sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
<source_key>1</source_key>
<sink_key>0</sink_key>
</connection>
</flow_graph>
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