哈Ha
在
上一部分中 ，考虑了对FM广播电台的RDS信号进行解码，并且下一篇文章的想法本身就产生了-您需要创建自己的FM发射机。
使用RDS将有两个选项-简单和更复杂。
和以前的情况一样，我们将在GNU Radio中完成所有这些操作，而无需编写任何代码。 对于那些感兴趣的人，继续减产。
因此，让我们开始吧。 当然，对于测试，我们需要具有传输能力的SDR（HackRF，USRP，LimeSDR）。
调频发射机
简单的发送器方案只需单击两次即可完成，我希望它在理解方面不会带来任何困难。 我使用WAV文件作为源，尽管您可以根据需要使用其他源，例如声卡的输入。
实际上，此方案中有两个关键模块-WBFM发送器和重采样器，它们可转换流的采样率。 采样频率的所有值必须彼此对应，否则将跳过一些采样，听到这些声音时会听到喀哒声。 “乘数常量”块用于调整输入电平。 同样重要的是不要混淆，在GNU Radio中，FM有两个不同的块-WBFM和NBFM。 我们恰好需要第一个宽带FM。 NFM调制用于便携式无线电。
总的来说，一切都很简单，我们开始工作。 电路中没有UI块，因此您也可以从命令行使用它（
第4部分中的更多内容 ）。
顺便说一句，如果您查看频谱，则可以确保发送简单的单声道信号，而没有任何通道，导频音和其他东西。
现在是时候进行更复杂的选择了。
带RDS的变送器
当然，带有RDS的发送器电路将更加复杂。 它的原始版本取自
gr-rds示例，并进行了微小的更改（Windows的原始版本不起作用，本文底部的“正确”版本），我们将考虑它的组成部分。
（原始
分辨率 ）
电路的顶部三分之一是RDS传输。 在输入处有一个RDS编码器，该编码器根据可用数据（站名，国家/地区代码等）生成RDS数据包。 然后对比特流进行
差分编码 ，其思想是删除格式为001000001的重复序列。然后对信号进行处理，并对其进行57KHz的调制。 核心部分是声音的创造。 在此形成通道L + R和LR。 声源底部是.wav文件。 最后，“加”模块将所有这些加在一起，然后将19KHz导频音和第二个38KHz音加到信号上。 所有这些总信号都发送到频率调制器，所有这些都通过SDR发送到空中。
从理论上讲，该方案不是100％完整的，例如，没有预失真块，19、38和57KHz的音调相位不同步。 另一方面，要了解声音的一般广播方式，这样的方案就足够了；希望的人可以自己完成。
启动时，将打开一个窗口，其中一些参数可以更改。
曾经有过用真实的接收机测试RDS的愿望，但事实证明FM广播已经是自闭症，而我在家中却没有。 即使在最新型号的智能手机中，也缺少它。 因此，我不得不将RTL-SDR V3和GQRX用作控制接收器，结果在KDPV上。
当然，在测试之前，必须选择一个自由频率，以使其上没有电台，并且建议不要超过允许的功率。 对于想要获得最大范围的用户，
可以购买放大器 ，建议以正确的频率制作天线，以使至少存在1/4偶极子波长。
结论
如您所见，从原理上讲，发送FM广播没有什么超级复杂的，在GNU Radio中一切都是完全可行的（尽管如果没有示例说明，要重复进行此操作并不容易，因为根本没有记录该系统）。 现在，至少读者有一个可行的例子。
扰流板下方块的源代码。
fm_tx.grc<?xml version='1.0' encoding='utf-8'?> <?grc format='1' created='3.7.11'?> <flow_graph> <timestamp>Tue Jun 18 20:27:26 2019</timestamp> <block> <key>options</key> <param> <key>author</key> <value></value> </param> <param> <key>window_size</key> <value></value> </param> <param> <key>category</key> <value>[GRC Hier Blocks]</value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>description</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(16, 20)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>generate_options</key> <value>wx_gui</value> </param> <param> <key>hier_block_src_path</key> <value>.:</value> </param> <param> <key>id</key> <value>top_block</value> </param> <param> <key>max_nouts</key> <value>0</value> </param> <param> <key>qt_qss_theme</key> <value></value> </param> <param> <key>realtime_scheduling</key> <value></value> </param> <param> <key>run_command</key> <value>{python} -u {filename}</value> </param> <param> <key>run_options</key> <value>prompt</value> </param> <param> <key>run</key> <value>True</value> </param> <param> <key>thread_safe_setters</key> <value></value> </param> <param> <key>title</key> <value></value> </param> </block> <block> <key>analog_wfm_tx</key> <param> <key>audio_rate</key> <value>80000</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(592, 76)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>analog_wfm_tx_0</value> </param> <param> <key>max_dev</key> <value>75e3</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>fh</key> <value>-1.0</value> </param> <param> <key>quad_rate</key> <value>320000</value> </param> <param> <key>tau</key> <value>75e-6</value> </param> </block> <block> <key>blocks_multiply_const_vxx</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>const</key> <value>0.45</value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(248, 108)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>blocks_multiply_const_vxx_0</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>vlen</key> <value>1</value> </param> </block> <block> <key>blocks_wavfile_source</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>file</key> <value>D:\MyProjects\GNURadio\sound.wav</value> </param> <param> <key>_coordinate</key> <value>(24, 100)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>blocks_wavfile_source_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>nchan</key> <value>1</value> </param> <param> <key>repeat</key> <value>True</value> </param> </block> <block> <key>rational_resampler_xxx</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>decim</key> <value>3</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>fbw</key> <value>0</value> </param> <param> <key>_coordinate</key> <value>(408, 84)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>rational_resampler_xxx_0</value> </param> <param> <key>interp</key> <value>5</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>taps</key> <value></value> </param> <param> <key>type</key> <value>fff</value> </param> </block> <block> <key>uhd_usrp_sink</key> <param> <key>alias</key> <value></value> </param> <param> <key>ant0</key> <value></value> </param> <param> <key>bw0</key> <value>0</value> </param> <param> <key>center_freq0</key> <value>95.6e6</value> </param> <param> <key>norm_gain0</key> <value>False</value> </param> <param> <key>gain0</key> <value>30</value> </param> <param> <key>ant10</key> <value></value> </param> <param> <key>bw10</key> <value>0</value> </param> <param> <key>center_freq10</key> <value>0</value> </param> <param> <key>norm_gain10</key> <value>False</value> </param> <param> <key>gain10</key> <value>0</value> </param> <param> <key>ant11</key> <value></value> </param> <param> <key>bw11</key> <value>0</value> </param> <param> <key>center_freq11</key> <value>0</value> </param> <param> <key>norm_gain11</key> <value>False</value> </param> <param> <key>gain11</key> <value>0</value> </param> <param> <key>ant12</key> <value></value> </param> <param> <key>bw12</key> <value>0</value> </param> <param> <key>center_freq12</key> <value>0</value> </param> <param> <key>norm_gain12</key> <value>False</value> </param> <param> <key>gain12</key> <value>0</value> </param> <param> <key>ant13</key> <value></value> </param> <param> <key>bw13</key> <value>0</value> </param> <param> <key>center_freq13</key> <value>0</value> </param> <param> <key>norm_gain13</key> <value>False</value> </param> <param> <key>gain13</key> <value>0</value> </param> <param> <key>ant14</key> <value></value> </param> <param> <key>bw14</key> <value>0</value> </param> <param> <key>center_freq14</key> <value>0</value> </param> <param> <key>norm_gain14</key> <value>False</value> </param> <param> <key>gain14</key> <value>0</value> </param> <param> <key>ant15</key> <value></value> </param> <param> <key>bw15</key> <value>0</value> </param> <param> <key>center_freq15</key> <value>0</value> </param> <param> <key>norm_gain15</key> <value>False</value> </param> <param> <key>gain15</key> <value>0</value> </param> <param> <key>ant16</key> <value></value> </param> <param> <key>bw16</key> <value>0</value> </param> <param> <key>center_freq16</key> <value>0</value> </param> <param> <key>norm_gain16</key> <value>False</value> </param> <param> <key>gain16</key> <value>0</value> </param> <param> <key>ant17</key> <value></value> </param> <param> <key>bw17</key> <value>0</value> </param> <param> <key>center_freq17</key> <value>0</value> </param> <param> <key>norm_gain17</key> <value>False</value> </param> <param> <key>gain17</key> <value>0</value> </param> <param> <key>ant18</key> <value></value> </param> <param> <key>bw18</key> <value>0</value> </param> <param> <key>center_freq18</key> <value>0</value> </param> <param> <key>norm_gain18</key> <value>False</value> </param> <param> <key>gain18</key> <value>0</value> </param> <param> <key>ant19</key> <value></value> </param> <param> <key>bw19</key> <value>0</value> </param> <param> <key>center_freq19</key> <value>0</value> </param> <param> <key>norm_gain19</key> <value>False</value> </param> <param> <key>gain19</key> <value>0</value> </param> <param> <key>ant1</key> <value></value> </param> <param> <key>bw1</key> <value>0</value> </param> <param> <key>center_freq1</key> <value>0</value> </param> <param> <key>norm_gain1</key> <value>False</value> </param> <param> <key>gain1</key> <value>0</value> </param> <param> <key>ant20</key> <value></value> </param> <param> <key>bw20</key> <value>0</value> </param> <param> <key>center_freq20</key> <value>0</value> </param> <param> <key>norm_gain20</key> <value>False</value> </param> <param> <key>gain20</key> <value>0</value> </param> <param> <key>ant21</key> <value></value> </param> <param> <key>bw21</key> <value>0</value> </param> <param> <key>center_freq21</key> <value>0</value> </param> <param> <key>norm_gain21</key> <value>False</value> </param> <param> <key>gain21</key> <value>0</value> </param> <param> <key>ant22</key> <value></value> </param> <param> <key>bw22</key> <value>0</value> </param> <param> <key>center_freq22</key> <value>0</value> </param> <param> <key>norm_gain22</key> <value>False</value> </param> <param> <key>gain22</key> <value>0</value> </param> <param> <key>ant23</key> <value></value> </param> <param> <key>bw23</key> <value>0</value> </param> <param> <key>center_freq23</key> <value>0</value> </param> <param> <key>norm_gain23</key> <value>False</value> </param> <param> <key>gain23</key> <value>0</value> </param> <param> <key>ant24</key> <value></value> </param> <param> <key>bw24</key> <value>0</value> </param> <param> <key>center_freq24</key> <value>0</value> </param> <param> <key>norm_gain24</key> <value>False</value> </param> <param> <key>gain24</key> <value>0</value> </param> <param> <key>ant25</key> <value></value> </param> <param> <key>bw25</key> <value>0</value> </param> <param> <key>center_freq25</key> <value>0</value> </param> <param> <key>norm_gain25</key> <value>False</value> </param> <param> <key>gain25</key> <value>0</value> </param> <param> <key>ant26</key> <value></value> </param> <param> <key>bw26</key> <value>0</value> </param> <param> <key>center_freq26</key> <value>0</value> </param> <param> <key>norm_gain26</key> <value>False</value> </param> <param> <key>gain26</key> <value>0</value> </param> <param> <key>ant27</key> <value></value> </param> <param> <key>bw27</key> <value>0</value> </param> <param> <key>center_freq27</key> <value>0</value> </param> <param> <key>norm_gain27</key> <value>False</value> </param> <param> <key>gain27</key> <value>0</value> </param> <param> <key>ant28</key> <value></value> </param> <param> <key>bw28</key> <value>0</value> </param> <param> <key>center_freq28</key> <value>0</value> </param> <param> <key>norm_gain28</key> <value>False</value> </param> <param> <key>gain28</key> <value>0</value> </param> <param> <key>ant29</key> <value></value> </param> <param> <key>bw29</key> <value>0</value> </param> <param> <key>center_freq29</key> <value>0</value> </param> <param> <key>norm_gain29</key> <value>False</value> </param> <param> <key>gain29</key> <value>0</value> </param> <param> <key>ant2</key> <value></value> </param> <param> <key>bw2</key> <value>0</value> </param> <param> <key>center_freq2</key> <value>0</value> </param> <param> <key>norm_gain2</key> <value>False</value> </param> <param> <key>gain2</key> <value>0</value> </param> <param> <key>ant30</key> <value></value> </param> <param> <key>bw30</key> <value>0</value> </param> <param> <key>center_freq30</key> <value>0</value> </param> <param> <key>norm_gain30</key> <value>False</value> </param> <param> <key>gain30</key> <value>0</value> </param> <param> <key>ant31</key> <value></value> </param> <param> <key>bw31</key> <value>0</value> </param> <param> <key>center_freq31</key> <value>0</value> </param> <param> <key>norm_gain31</key> <value>False</value> </param> <param> <key>gain31</key> <value>0</value> </param> <param> <key>ant3</key> <value></value> </param> <param> <key>bw3</key> <value>0</value> </param> <param> <key>center_freq3</key> <value>0</value> </param> <param> <key>norm_gain3</key> <value>False</value> </param> <param> <key>gain3</key> <value>0</value> </param> <param> <key>ant4</key> <value></value> </param> <param> <key>bw4</key> <value>0</value> </param> <param> <key>center_freq4</key> <value>0</value> </param> <param> <key>norm_gain4</key> <value>False</value> </param> <param> <key>gain4</key> <value>0</value> </param> <param> <key>ant5</key> <value></value> </param> <param> <key>bw5</key> <value>0</value> </param> <param> <key>center_freq5</key> <value>0</value> </param> <param> <key>norm_gain5</key> <value>False</value> </param> <param> <key>gain5</key> <value>0</value> </param> <param> <key>ant6</key> <value></value> </param> <param> <key>bw6</key> <value>0</value> </param> <param> <key>center_freq6</key> <value>0</value> </param> <param> <key>norm_gain6</key> <value>False</value> </param> <param> <key>gain6</key> <value>0</value> </param> <param> <key>ant7</key> <value></value> </param> <param> <key>bw7</key> <value>0</value> </param> <param> <key>center_freq7</key> <value>0</value> </param> <param> <key>norm_gain7</key> <value>False</value> </param> <param> <key>gain7</key> <value>0</value> </param> <param> <key>ant8</key> <value></value> </param> <param> <key>bw8</key> <value>0</value> </param> <param> <key>center_freq8</key> <value>0</value> </param> <param> <key>norm_gain8</key> <value>False</value> </param> <param> <key>gain8</key> <value>0</value> </param> <param> <key>ant9</key> <value></value> </param> <param> <key>bw9</key> <value>0</value> </param> <param> <key>center_freq9</key> <value>0</value> </param> <param> <key>norm_gain9</key> <value>False</value> </param> <param> <key>gain9</key> <value>0</value> </param> <param> <key>clock_rate</key> <value>0.0</value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>dev_addr</key> <value>""</value> </param> <param> <key>dev_args</key> <value>""</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(848, 68)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>uhd_usrp_sink_0</value> </param> <param> <key>type</key> <value>fc32</value> </param> <param> <key>clock_source0</key> <value></value> </param> <param> <key>sd_spec0</key> <value></value> </param> <param> <key>time_source0</key> <value></value> </param> <param> <key>clock_source1</key> <value></value> </param> <param> <key>sd_spec1</key> <value></value> </param> <param> <key>time_source1</key> <value></value> </param> <param> <key>clock_source2</key> <value></value> </param> <param> <key>sd_spec2</key> <value></value> </param> <param> <key>time_source2</key> <value></value> </param> <param> <key>clock_source3</key> <value></value> </param> <param> <key>sd_spec3</key> <value></value> </param> <param> <key>time_source3</key> <value></value> </param> <param> <key>clock_source4</key> <value></value> </param> <param> <key>sd_spec4</key> <value></value> </param> <param> <key>time_source4</key> <value></value> </param> <param> <key>clock_source5</key> <value></value> </param> <param> <key>sd_spec5</key> <value></value> </param> <param> <key>time_source5</key> <value></value> </param> <param> <key>clock_source6</key> <value></value> </param> <param> <key>sd_spec6</key> <value></value> </param> <param> <key>time_source6</key> <value></value> </param> 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<sink_block_id>rational_resampler_xxx_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>blocks_wavfile_source_0</source_block_id> <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>rational_resampler_xxx_0</source_block_id> <sink_block_id>analog_wfm_tx_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> </flow_graph>
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<key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_rds_encoder_0</value> </param> <param> <key>ms</key> <value>True</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>pi_country_code</key> <value>13</value> </param> <param> <key>pi_coverage_area</key> <value>0</value> </param> <param> <key>pi_reference_number</key> <value>147</value> </param> <param> <key>ps</key> <value>SDRRADIO</value> </param> <param> <key>pty_locale</key> <value>0</value> </param> <param> <key>pty</key> <value>0</value> </param> <param> <key>radiotext</key> <value>Hello HABR!</value> </param> <param> <key>ta</key> <value>False</value> </param> <param> <key>tp</key> <value>True</value> </param> </block> <block> <key>analog_sig_source_x</key> <param> <key>amp</key> <value>1</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>freq</key> <value>38e3</value> </param> <param> <key>_coordinate</key> <value>(24, 372)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_sig_source_x_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>offset</key> <value>0</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>samp_rate</key> <value>data_rate</value> </param> <param> <key>waveform</key> <value>analog.GR_SIN_WAVE</value> </param> </block> <block> <key>analog_sig_source_x</key> <param> <key>amp</key> <value>1</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>1</value> </param> <param> <key>freq</key> <value>57e3</value> </param> <param> <key>_coordinate</key> <value>(1264, 100)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_sig_source_x_0_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>offset</key> <value>0</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>samp_rate</key> <value>data_rate</value> </param> <param> <key>waveform</key> <value>analog.GR_SIN_WAVE</value> </param> </block> <block> <key>analog_sig_source_x</key> <param> <key>amp</key> <value>1</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>freq</key> <value>19e3</value> </param> <param> <key>_coordinate</key> <value>(24, 268)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_sig_source_x_0_1</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>offset</key> <value>0</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>samp_rate</key> <value>data_rate</value> </param> <param> <key>waveform</key> <value>analog.GR_SIN_WAVE</value> </param> </block> <block> <key>blocks_sub_xx</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(448, 456)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_sub_xx_0</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>num_inputs</key> <value>2</value> </param> <param> <key>vlen</key> <value>1</value> </param> </block> <block> <key>blocks_unpack_k_bits_bb</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>1</value> </param> <param> <key>_coordinate</key> <value>(680, 172)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_unpack_k_bits_bb_0</value> </param> <param> <key>k</key> <value>2</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> </block> <block> <key>import</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(8, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>import_0</value> </param> <param> <key>import</key> <value>import math</value> </param> </block> <block> <key>low_pass_filter</key> <param> <key>beta</key> <value>6.76</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>cutoff_freq</key> <value>2.5e3</value> </param> <param> <key>decim</key> <value>1</value> </param> <param> <key>_enabled</key> <value>1</value> </param> <param> <key>type</key> <value>interp_fir_filter_fff</value> </param> <param> <key>_coordinate</key> <value>(1248, 212)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>gain</key> <value>1</value> </param> <param> <key>id</key> <value>low_pass_filter_0</value> </param> <param> <key>interp</key> <value>1</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>samp_rate</key> <value>data_rate</value> </param> <param> <key>width</key> <value>.5e3</value> </param> <param> <key>win</key> <value>firdes.WIN_HAMMING</value> </param> </block> <block> <key>low_pass_filter</key> <param> <key>beta</key> <value>6.76</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>cutoff_freq</key> <value>15e3</value> </param> <param> <key>decim</key> <value>1</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>type</key> <value>interp_fir_filter_fff</value> </param> <param> <key>_coordinate</key> <value>(584, 532)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>gain</key> <value>1</value> </param> <param> <key>id</key> <value>low_pass_filter_0_0</value> </param> <param> <key>interp</key> <value>1</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>samp_rate</key> <value>data_rate</value> </param> <param> <key>width</key> <value>2e3</value> </param> <param> <key>win</key> <value>firdes.WIN_HAMMING</value> </param> </block> <block> <key>low_pass_filter</key> <param> <key>beta</key> <value>6.76</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>cutoff_freq</key> <value>15e3</value> </param> <param> <key>decim</key> <value>1</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>type</key> <value>interp_fir_filter_fff</value> </param> <param> <key>_coordinate</key> <value>(584, 396)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>gain</key> <value>1</value> </param> <param> <key>id</key> <value>low_pass_filter_0_0_0</value> </param> <param> <key>interp</key> <value>1</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>samp_rate</key> <value>data_rate</value> </param> <param> <key>width</key> <value>2e3</value> </param> <param> <key>win</key> <value>firdes.WIN_HAMMING</value> </param> </block> <block> <key>rational_resampler_xxx</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>decim</key> <value>6</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>fbw</key> <value>0</value> </param> <param> <key>_coordinate</key> <value>(168, 444)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>rational_resampler_xxx_0</value> </param> <param> <key>interp</key> <value>48</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>taps</key> <value></value> </param> <param> <key>type</key> <value>fff</value> </param> </block> <block> <key>rational_resampler_xxx</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>decim</key> <value>6</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>fbw</key> <value>0</value> </param> <param> <key>_coordinate</key> <value>(160, 540)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>rational_resampler_xxx_0_0</value> </param> <param> <key>interp</key> <value>48</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>taps</key> <value></value> </param> <param> <key>type</key> <value>fff</value> </param> </block> <block> <key>rational_resampler_xxx</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>decim</key> <value>38</value> </param> <param> <key>_enabled</key> <value>1</value> </param> <param> <key>fbw</key> <value>0</value> </param> <param> <key>_coordinate</key> <value>(1104, 740)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>rational_resampler_xxx_1</value> </param> <param> <key>interp</key> <value>50</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>taps</key> <value></value> </param> <param> <key>type</key> <value>ccc</value> </param> </block> <block> <key>uhd_usrp_sink</key> <param> <key>alias</key> <value></value> </param> <param> <key>ant0</key> <value>TX/RX</value> </param> <param> <key>bw0</key> <value>0</value> </param> <param> <key>center_freq0</key> <value>freq</value> </param> <param> <key>norm_gain0</key> <value>False</value> </param> <param> <key>gain0</key> <value>50</value> </param> <param> <key>ant10</key> <value></value> </param> <param> <key>bw10</key> <value>0</value> </param> <param> <key>center_freq10</key> <value>0</value> </param> <param> <key>norm_gain10</key> <value>False</value> </param> <param> <key>gain10</key> <value>0</value> </param> <param> <key>ant11</key> <value></value> </param> <param> <key>bw11</key> <value>0</value> </param> <param> <key>center_freq11</key> <value>0</value> </param> <param> <key>norm_gain11</key> <value>False</value> </param> <param> <key>gain11</key> <value>0</value> </param> <param> <key>ant12</key> <value></value> </param> <param> <key>bw12</key> <value>0</value> </param> <param> <key>center_freq12</key> <value>0</value> </param> <param> <key>norm_gain12</key> <value>False</value> </param> <param> <key>gain12</key> <value>0</value> </param> <param> <key>ant13</key> <value></value> </param> <param> <key>bw13</key> <value>0</value> </param> <param> <key>center_freq13</key> <value>0</value> </param> <param> <key>norm_gain13</key> <value>False</value> </param> <param> <key>gain13</key> <value>0</value> </param> <param> <key>ant14</key> <value></value> </param> <param> <key>bw14</key> <value>0</value> </param> <param> <key>center_freq14</key> <value>0</value> </param> <param> <key>norm_gain14</key> <value>False</value> </param> <param> <key>gain14</key> <value>0</value> </param> <param> <key>ant15</key> <value></value> </param> <param> <key>bw15</key> <value>0</value> </param> <param> <key>center_freq15</key> <value>0</value> </param> <param> <key>norm_gain15</key> <value>False</value> </param> <param> <key>gain15</key> <value>0</value> </param> <param> <key>ant16</key> <value></value> </param> <param> <key>bw16</key> <value>0</value> </param> <param> <key>center_freq16</key> <value>0</value> </param> <param> <key>norm_gain16</key> <value>False</value> </param> <param> <key>gain16</key> <value>0</value> </param> <param> <key>ant17</key> <value></value> </param> <param> <key>bw17</key> <value>0</value> </param> <param> <key>center_freq17</key> <value>0</value> </param> <param> <key>norm_gain17</key> <value>False</value> </param> <param> <key>gain17</key> <value>0</value> </param> <param> <key>ant18</key> <value></value> </param> <param> <key>bw18</key> <value>0</value> </param> <param> <key>center_freq18</key> <value>0</value> </param> <param> <key>norm_gain18</key> <value>False</value> </param> <param> <key>gain18</key> <value>0</value> </param> <param> <key>ant19</key> <value></value> </param> <param> <key>bw19</key> <value>0</value> </param> <param> <key>center_freq19</key> <value>0</value> </param> <param> <key>norm_gain19</key> <value>False</value> </param> <param> <key>gain19</key> <value>0</value> </param> <param> <key>ant1</key> <value></value> </param> <param> <key>bw1</key> <value>0</value> </param> <param> <key>center_freq1</key> <value>0</value> </param> <param> <key>norm_gain1</key> <value>False</value> </param> <param> <key>gain1</key> <value>0</value> </param> <param> <key>ant20</key> <value></value> </param> <param> <key>bw20</key> <value>0</value> </param> <param> <key>center_freq20</key> <value>0</value> </param> <param> <key>norm_gain20</key> <value>False</value> </param> <param> <key>gain20</key> <value>0</value> </param> <param> <key>ant21</key> <value></value> </param> <param> <key>bw21</key> <value>0</value> </param> <param> <key>center_freq21</key> <value>0</value> </param> <param> <key>norm_gain21</key> <value>False</value> </param> <param> <key>gain21</key> <value>0</value> </param> <param> <key>ant22</key> <value></value> </param> <param> <key>bw22</key> <value>0</value> </param> <param> <key>center_freq22</key> <value>0</value> </param> <param> <key>norm_gain22</key> <value>False</value> </param> <param> <key>gain22</key> <value>0</value> </param> <param> <key>ant23</key> <value></value> </param> <param> <key>bw23</key> <value>0</value> </param> <param> <key>center_freq23</key> <value>0</value> </param> <param> <key>norm_gain23</key> <value>False</value> </param> <param> <key>gain23</key> <value>0</value> </param> <param> <key>ant24</key> <value></value> </param> <param> <key>bw24</key> <value>0</value> </param> <param> <key>center_freq24</key> <value>0</value> </param> <param> <key>norm_gain24</key> <value>False</value> </param> <param> <key>gain24</key> <value>0</value> </param> <param> <key>ant25</key> <value></value> </param> <param> <key>bw25</key> <value>0</value> </param> <param> <key>center_freq25</key> <value>0</value> </param> <param> <key>norm_gain25</key> <value>False</value> </param> <param> <key>gain25</key> <value>0</value> </param> <param> <key>ant26</key> <value></value> </param> <param> <key>bw26</key> <value>0</value> </param> <param> <key>center_freq26</key> <value>0</value> </param> <param> <key>norm_gain26</key> <value>False</value> </param> <param> <key>gain26</key> <value>0</value> </param> <param> <key>ant27</key> <value></value> </param> <param> <key>bw27</key> <value>0</value> </param> <param> <key>center_freq27</key> <value>0</value> </param> <param> <key>norm_gain27</key> <value>False</value> </param> <param> <key>gain27</key> <value>0</value> </param> <param> <key>ant28</key> <value></value> </param> <param> <key>bw28</key> <value>0</value> </param> <param> <key>center_freq28</key> <value>0</value> </param> <param> <key>norm_gain28</key> <value>False</value> </param> <param> <key>gain28</key> <value>0</value> </param> <param> <key>ant29</key> <value></value> </param> <param> <key>bw29</key> <value>0</value> </param> <param> <key>center_freq29</key> <value>0</value> </param> <param> <key>norm_gain29</key> <value>False</value> </param> <param> <key>gain29</key> <value>0</value> </param> <param> <key>ant2</key> <value></value> </param> <param> <key>bw2</key> <value>0</value> </param> <param> <key>center_freq2</key> <value>0</value> </param> <param> <key>norm_gain2</key> <value>False</value> </param> <param> <key>gain2</key> <value>0</value> </param> <param> <key>ant30</key> <value></value> </param> <param> <key>bw30</key> <value>0</value> </param> <param> <key>center_freq30</key> <value>0</value> </param> <param> <key>norm_gain30</key> <value>False</value> </param> <param> <key>gain30</key> <value>0</value> </param> <param> <key>ant31</key> <value></value> </param> <param> <key>bw31</key> <value>0</value> </param> <param> <key>center_freq31</key> <value>0</value> </param> <param> <key>norm_gain31</key> <value>False</value> </param> <param> <key>gain31</key> <value>0</value> </param> <param> <key>ant3</key> <value></value> </param> <param> <key>bw3</key> <value>0</value> </param> <param> <key>center_freq3</key> <value>0</value> </param> <param> <key>norm_gain3</key> <value>False</value> </param> <param> <key>gain3</key> <value>0</value> </param> <param> <key>ant4</key> <value></value> </param> <param> <key>bw4</key> <value>0</value> </param> <param> <key>center_freq4</key> <value>0</value> </param> <param> <key>norm_gain4</key> <value>False</value> </param> <param> <key>gain4</key> <value>0</value> </param> <param> <key>ant5</key> <value></value> </param> <param> <key>bw5</key> <value>0</value> </param> <param> <key>center_freq5</key> <value>0</value> </param> <param> <key>norm_gain5</key> <value>False</value> </param> <param> <key>gain5</key> <value>0</value> </param> <param> <key>ant6</key> <value></value> </param> <param> <key>bw6</key> <value>0</value> </param> <param> <key>center_freq6</key> <value>0</value> </param> <param> <key>norm_gain6</key> <value>False</value> </param> <param> <key>gain6</key> <value>0</value> </param> <param> <key>ant7</key> <value></value> </param> <param> <key>bw7</key> <value>0</value> </param> <param> <key>center_freq7</key> <value>0</value> </param> <param> <key>norm_gain7</key> <value>False</value> </param> <param> <key>gain7</key> <value>0</value> </param> <param> <key>ant8</key> <value></value> </param> <param> <key>bw8</key> <value>0</value> </param> <param> <key>center_freq8</key> <value>0</value> </param> <param> <key>norm_gain8</key> <value>False</value> </param> <param> <key>gain8</key> <value>0</value> </param> <param> <key>ant9</key> <value></value> </param> <param> <key>bw9</key> <value>0</value> </param> <param> <key>center_freq9</key> <value>0</value> </param> <param> <key>norm_gain9</key> <value>False</value> </param> <param> <key>gain9</key> <value>0</value> </param> <param> <key>clock_rate</key> <value>0.0</value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>dev_addr</key> <value></value> </param> <param> <key>dev_args</key> <value>""</value> </param> <param> <key>_enabled</key> <value>1</value> </param> <param> <key>_coordinate</key> <value>(1296, 724)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>uhd_usrp_sink</value> </param> <param> <key>type</key> <value>fc32</value> </param> <param> <key>clock_source0</key> <value></value> </param> <param> <key>sd_spec0</key> <value></value> </param> <param> <key>time_source0</key> <value></value> </param> <param> <key>clock_source1</key> <value></value> </param> <param> <key>sd_spec1</key> <value></value> </param> <param> <key>time_source1</key> <value></value> </param> <param> <key>clock_source2</key> <value></value> </param> <param> <key>sd_spec2</key> <value></value> </param> <param> <key>time_source2</key> <value></value> </param> <param> <key>clock_source3</key> <value></value> </param> <param> <key>sd_spec3</key> <value></value> </param> <param> <key>time_source3</key> <value></value> 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<key>stream_args</key> <value></value> </param> <param> <key>stream_chans</key> <value>[]</value> </param> <param> <key>sync</key> <value></value> </param> <param> <key>len_tag_name</key> <value></value> </param> <param> <key>otw</key> <value></value> </param> </block> <block> <key>wxgui_fftsink2</key> <param> <key>avg_alpha</key> <value>0</value> </param> <param> <key>average</key> <value>False</value> </param> <param> <key>baseband_freq</key> <value>0</value> </param> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> <value>1</value> </param> <param> <key>fft_size</key> <value>1024</value> </param> <param> <key>freqvar</key> <value>None</value> </param> <param> <key>_coordinate</key> <value>(1104, 520)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> 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, . .