哈Ha
在上一篇有关软件定义无线电的文章中，有人问我如何使用GNU Radio解码RDS。 从头开始创建RDS解码器不是那么容易，但是对我们来说幸运的是，它已经内置在GNU Radio中，因此无需编写一行代码，而只需编写RTL-SDR接收器，就很容易看到它的工作原理。
运作方式，继续削减。
关于GNU Radio及其安装，我不再赘述。 简而言之，可以在
此处找到Windows发行版。 让我们继续RDS。
如果某人突然不知道，
RDS （无线电数据系统）是常规FM广播中使用的协议，用于传输其他数字信息（时间，汇率，天气等）。 传输速度为1187.5bps，频率为57KHz（导频音的三次谐波），使用使用BPSK相位编码（二进制相移键控）的相位最小化。
之前 ，已经在集线器上考虑了比特级RDS，那么，我们将继续使用GNU Radio。
GNU Radio的解码器大约是
10年前制造的 ，但是观看该版本毫无用处，许多块的名称已更改，此处给出的示例不再起作用。 更新的fork可以
从这里获取 。
顺便说一句，它无法从Windows的源中收集gr-rds-尽管安装了Boost，但cmake会给出缺少Boost的错误。 顺便说一句，令人难以理解的是，在存在cmake和boost的多年中，没有学会如何在Windows中找到cmake的知识-就像在磁盘上找到文件夹根本不是火箭科学（如果有人知道解决方案，请在评论中写，尽管通过Stack Overflow判断，这个问题已经
存在多年了）都不在乎）。 但事实证明，我们不需要它-RDS解码器已经添加到GNU Radio中，因此从github上的项目中，我们只需要
apps文件夹中的示例。
示例中包含的框图非常庞杂，此外，打开它时还会产生错误（块标记为红色）。
但是，在现实生活中，一切都变得更加简单-电路的2/3是FM立体声播放器，其中L + R和LR通道从原始信号中提取出来，进行处理并馈入声卡。 现在，这与我们无关，因此可以删除这些代码块（更重要的是，由于某种原因，它虽然无法立即使用，但太懒了，无法理解）。 由于“网格位置”参数而导致出现错误，Windows版本显然不支持该参数，但是可以毫无问题地将其删除，并且不影响功能。
删除“多余的”后，工作的RDS解码器电路如下所示：
让我们看看那里是什么。
初始信号来自RTL-SDR源，频率由freq参数设置，该参数是WX GUI滑块类型（是的，您可以在GNU Radio中创建自己的UI，并且有基本控件）。 为了避免中心零频率处的峰值，使用了freq_offset参数，“频率Xlating”块将频率偏移该值。 顾名思义，WBFM接收模块执行FM解调，然后再次移动频率以突出显示57KHz RDS本身。 根余弦滤波器块选择一个较窄的频率，但是参数2的MPSK解码器执行BPSK解码（RDS本身使用具有两种状态的
相位调制来发送）。 RDS使用
差分编码 ，因此将调用相应的差分解码器，最后，将完成的二进制流发送到RDS解码器块（其源可以在
github上查看）。 在解码器之后，一个同样重要的部分是
RDS解析器-RDS中有很多数据包类型，解析器会做所有工作来解密它们。
其实仅此而已。 KDPV上的解码器结果和屏幕截图。
如果有人需要在无UI模式下使用该程序，则可以使用FR Tap块，在此进行更详细的描述，我个人还没有尝试过。 如果较低位的RDS很有趣，我
早些考虑
过 ，出于普遍的利益，它也很有用。
与往常一样，所有成功的实验。
Windows下运行的原始GRC文件位于扰流板下（您只需更改广播电台的频率即可）。
rds_rx.grc<?xml version='1.0' encoding='utf-8'?> <?grc format='1' created='3.7.11'?> <flow_graph> <timestamp>Thu Aug 28 08:24:49 2014</timestamp> <block> <key>options</key> <param> <key>author</key> <value></value> </param> <param> <key>window_size</key> <value>1600, 1600</value> </param> <param> <key>category</key> <value>Custom</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>(14, 9)</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>rds_rx</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>Stereo FM receiver and RDS Decoder</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(8, 156)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>audio_decim</value> </param> <param> <key>value</key> <value>5</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(112, 156)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>audio_decim_rate</value> </param> <param> <key>value</key> <value>baseband_rate/audio_decim</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(112, 92)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>baseband_rate</value> </param> <param> <key>value</key> <value>samp_rate/bb_decim</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(240, 156)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>bb_decim</value> </param> <param> <key>value</key> <value>4</value> </param> </block> <block> <key>variable_slider</key> <param> <key>comment</key> <value></value> </param> <param> <key>converver</key> <value>float_converter</value> </param> <param> <key>value</key> <value>100.7e6</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(448, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>freq</value> </param> <param> <key>label</key> <value>Freq</value> </param> <param> <key>max</key> <value>107.9e6</value> </param> <param> <key>min</key> <value>88.1e6</value> </param> <param> <key>notebook</key> <value></value> </param> <param> <key>num_steps</key> <value>99</value> </param> <param> <key>style</key> <value>wx.SL_HORIZONTAL</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(448, 132)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>freq_offset</value> </param> <param> <key>value</key> <value>250000</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(224, 92)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>freq_tune</value> </param> <param> <key>value</key> <value>freq - freq_offset</value> </param> </block> <block> <key>variable_slider</key> <param> <key>comment</key> <value></value> </param> <param> <key>converver</key> <value>float_converter</value> </param> <param> <key>value</key> <value>20</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(336, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>gain</value> </param> <param> <key>label</key> <value>RF Gain</value> </param> <param> <key>max</key> <value>49.6</value> </param> <param> <key>min</key> <value>0</value> </param> <param> <key>notebook</key> <value></value> </param> <param> <key>num_steps</key> <value>124</value> </param> <param> <key>style</key> <value>wx.SL_HORIZONTAL</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(8, 92)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>samp_rate</value> </param> <param> <key>value</key> <value>1000000</value> </param> </block> <block> <key>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(336, 132)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>xlate_bandwidth</value> </param> <param> <key>value</key> <value>100000</value> </param> </block> <block> <key>analog_wfm_rcv</key> <param> <key>audio_decimation</key> <value>bb_decim</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>(576, 356)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>analog_wfm_rcv_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>quad_rate</key> <value>samp_rate</value> </param> </block> <block> <key>blocks_complex_to_real</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>(792, 632)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>blocks_complex_to_real_0</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_keep_one_in_n</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>(280, 788)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>blocks_keep_one_in_n_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>n</key> <value>2</value> </param> <param> <key>type</key> <value>byte</value> </param> <param> <key>vlen</key> <value>1</value> </param> </block> <block> <key>digital_binary_slicer_fb</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>(112, 792)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>digital_binary_slicer_fb_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> </block> <block> <key>digital_diff_decoder_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>True</value> </param> <param> <key>_coordinate</key> <value>(424, 788)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>digital_diff_decoder_bb_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>modulus</key> <value>2</value> </param> </block> <block> <key>digital_mpsk_receiver_cc</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>(528, 488)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>gain_mu</key> <value>0.05</value> </param> <param> <key>gain_omega</key> <value>0.001</value> </param> <param> <key>id</key> <value>digital_mpsk_receiver_cc_0</value> </param> <param> <key>w</key> <value>1*cmath.pi/100.0</value> </param> <param> <key>M</key> <value>2</value> </param> <param> <key>fmax</key> <value>0.06</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>fmin</key> <value>-0.06</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>mu</key> <value>0.5</value> </param> <param> <key>omega_relative_limit</key> <value>0.005</value> </param> <param> <key>omega</key> <value>samp_rate/bb_decim/audio_decim/ 2375.0</value> </param> <param> <key>theta</key> <value>0</value> </param> </block> <block> <key>freq_xlating_fir_filter_xxx</key> <param> <key>alias</key> <value></value> </param> <param> <key>center_freq</key> <value>freq_offset</value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>decim</key> <value>1</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(279, 296)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>freq_xlating_fir_filter_xxx_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>samp_rate</key> <value>samp_rate</value> </param> <param> <key>taps</key> <value>firdes.low_pass(1, samp_rate, xlate_bandwidth, 100000)</value> </param> <param> <key>type</key> <value>ccc</value> </param> </block> <block> <key>freq_xlating_fir_filter_xxx</key> <param> <key>alias</key> <value></value> </param> <param> <key>center_freq</key> <value>57e3</value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>decim</key> <value>audio_decim</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(72, 532)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>freq_xlating_fir_filter_xxx_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>baseband_rate</value> </param> <param> <key>taps</key> <value>firdes.low_pass(2500.0,baseband_rate,2.4e3,2e3,firdes.WIN_HAMMING)</value> </param> <param> <key>type</key> <value>fcc</value> </param> </block> <block> <key>gr_rds_decoder</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>debug</key> <value>False</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(632, 780)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_rds_decoder_0</value> </param> <param> <key>log</key> <value>False</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> </block> <block> <key>gr_rds_panel</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>freq</key> <value>freq</value> </param> <param> <key>_coordinate</key> <value>(984, 792)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>gr_rds_panel_0</value> </param> <param> <key>notebook</key> <value></value> </param> </block> <block> <key>gr_rds_parser</key> <param> <key>alias</key> <value></value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>debug</key> <value>False</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(800, 772)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_rds_parser_0</value> </param> <param> <key>log</key> <value>True</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>pty_locale</key> <value>0</value> </param> <param> <key>reset</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>(576, 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>notebook</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>(184, 6)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>nb</value> </param> <param> <key>labels</key> <value>['BB', 'Demod', 'L+R', 'Pilot', 'DSBSC', 'RDS', 'L-R', 'RDS constellation','Waterfall']</value> </param> <param> <key>notebook</key> <value></value> </param> <param> <key>style</key> <value>wx.NB_TOP</value> </param> </block> <block> <key>root_raised_cosine_filter</key> <param> <key>alpha</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>decim</key> <value>1</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>type</key> <value>fir_filter_ccf</value> </param> <param> <key>_coordinate</key> <value>(304, 516)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>gain</key> <value>1</value> </param> <param> <key>id</key> <value>root_raised_cosine_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>ntaps</key> <value>100</value> </param> <param> <key>samp_rate</key> <value>samp_rate/bb_decim/audio_decim</value> </param> <param> <key>sym_rate</key> <value>2375</value> </param> </block> <block> <key>rtlsdr_source</key> <param> <key>alias</key> <value></value> </param> <param> <key>ant0</key> <value></value> </param> <param> <key>bb_gain0</key> <value>20</value> </param> <param> <key>bw0</key> <value>0</value> </param> <param> <key>dc_offset_mode0</key> <value>0</value> </param> <param> <key>corr0</key> <value>0</value> </param> <param> <key>freq0</key> <value>freq_tune</value> </param> <param> <key>gain_mode0</key> <value>False</value> </param> <param> <key>if_gain0</key> <value>20</value> </param> <param> <key>iq_balance_mode0</key> <value>0</value> </param> <param> <key>gain0</key> <value>gain</value> </param> <param> <key>ant10</key> <value></value> </param> <param> <key>bb_gain10</key> <value>20</value> </param> <param> <key>bw10</key> <value>0</value> </param> <param> <key>dc_offset_mode10</key> <value>0</value> </param> <param> <key>corr10</key> <value>0</value> </param> <param> <key>freq10</key> <value>100e6</value> </param> <param> <key>gain_mode10</key> <value>False</value> </param> <param> <key>if_gain10</key> <value>20</value> </param> <param> <key>iq_balance_mode10</key> <value>0</value> </param> <param> <key>gain10</key> <value>10</value> </param> <param> <key>ant11</key> <value></value> </param> <param> <key>bb_gain11</key> <value>20</value> </param> <param> <key>bw11</key> <value>0</value> </param> <param> <key>dc_offset_mode11</key> <value>0</value> </param> <param> <key>corr11</key> <value>0</value> </param> <param> <key>freq11</key> <value>100e6</value> </param> <param> <key>gain_mode11</key> <value>False</value> </param> <param> <key>if_gain11</key> <value>20</value> </param> <param> <key>iq_balance_mode11</key> <value>0</value> </param> <param> <key>gain11</key> <value>10</value> </param> <param> <key>ant12</key> <value></value> </param> <param> <key>bb_gain12</key> <value>20</value> </param> <param> <key>bw12</key> <value>0</value> </param> <param> <key>dc_offset_mode12</key> <value>0</value> </param> <param> <key>corr12</key> <value>0</value> </param> <param> <key>freq12</key> <value>100e6</value> </param> <param> <key>gain_mode12</key> <value>False</value> </param> <param> <key>if_gain12</key> <value>20</value> </param> <param> <key>iq_balance_mode12</key> <value>0</value> </param> <param> <key>gain12</key> <value>10</value> </param> <param> <key>ant13</key> <value></value> </param> <param> <key>bb_gain13</key> <value>20</value> </param> <param> <key>bw13</key> <value>0</value> </param> <param> <key>dc_offset_mode13</key> <value>0</value> </param> <param> <key>corr13</key> <value>0</value> </param> <param> <key>freq13</key> <value>100e6</value> </param> <param> <key>gain_mode13</key> <value>False</value> </param> <param> <key>if_gain13</key> <value>20</value> </param> <param> <key>iq_balance_mode13</key> <value>0</value> </param> <param> <key>gain13</key> <value>10</value> </param> <param> <key>ant14</key> <value></value> </param> <param> <key>bb_gain14</key> <value>20</value> </param> <param> <key>bw14</key> <value>0</value> </param> <param> <key>dc_offset_mode14</key> <value>0</value> </param> <param> <key>corr14</key> <value>0</value> </param> <param> <key>freq14</key> <value>100e6</value> </param> <param> <key>gain_mode14</key> <value>False</value> </param> <param> <key>if_gain14</key> <value>20</value> </param> <param> <key>iq_balance_mode14</key> <value>0</value> </param> <param> <key>gain14</key> <value>10</value> </param> <param> <key>ant15</key> <value></value> </param> <param> <key>bb_gain15</key> <value>20</value> </param> <param> <key>bw15</key> <value>0</value> </param> <param> <key>dc_offset_mode15</key> <value>0</value> </param> <param> <key>corr15</key> <value>0</value> </param> <param> <key>freq15</key> <value>100e6</value> </param> <param> <key>gain_mode15</key> <value>False</value> </param> <param> <key>if_gain15</key> <value>20</value> </param> <param> <key>iq_balance_mode15</key> <value>0</value> </param> <param> <key>gain15</key> <value>10</value> </param> <param> <key>ant16</key> <value></value> </param> <param> <key>bb_gain16</key> <value>20</value> </param> <param> <key>bw16</key> <value>0</value> </param> <param> <key>dc_offset_mode16</key> <value>0</value> </param> <param> <key>corr16</key> <value>0</value> </param> <param> <key>freq16</key> <value>100e6</value> </param> <param> <key>gain_mode16</key> <value>False</value> </param> <param> <key>if_gain16</key> <value>20</value> </param> <param> <key>iq_balance_mode16</key> <value>0</value> </param> <param> <key>gain16</key> <value>10</value> </param> <param> <key>ant17</key> <value></value> </param> <param> <key>bb_gain17</key> <value>20</value> </param> <param> <key>bw17</key> <value>0</value> </param> <param> <key>dc_offset_mode17</key> <value>0</value> </param> <param> <key>corr17</key> <value>0</value> </param> <param> <key>freq17</key> <value>100e6</value> </param> <param> <key>gain_mode17</key> <value>False</value> </param> <param> <key>if_gain17</key> <value>20</value> </param> <param> <key>iq_balance_mode17</key> <value>0</value> </param> <param> <key>gain17</key> <value>10</value> </param> <param> <key>ant18</key> <value></value> </param> <param> <key>bb_gain18</key> <value>20</value> </param> <param> <key>bw18</key> <value>0</value> </param> <param> <key>dc_offset_mode18</key> <value>0</value> </param> <param> <key>corr18</key> <value>0</value> </param> <param> <key>freq18</key> <value>100e6</value> </param> <param> <key>gain_mode18</key> <value>False</value> </param> <param> <key>if_gain18</key> <value>20</value> </param> <param> <key>iq_balance_mode18</key> <value>0</value> </param> <param> <key>gain18</key> <value>10</value> </param> <param> <key>ant19</key> <value></value> </param> <param> <key>bb_gain19</key> <value>20</value> </param> <param> <key>bw19</key> <value>0</value> </param> <param> <key>dc_offset_mode19</key> <value>0</value> </param> <param> <key>corr19</key> <value>0</value> </param> <param> <key>freq19</key> <value>100e6</value> </param> <param> <key>gain_mode19</key> <value>False</value> </param> <param> <key>if_gain19</key> <value>20</value> </param> <param> <key>iq_balance_mode19</key> <value>0</value> </param> <param> <key>gain19</key> <value>10</value> </param> <param> <key>ant1</key> <value></value> </param> <param> <key>bb_gain1</key> <value>20</value> </param> <param> <key>bw1</key> <value>0</value> </param> <param> <key>dc_offset_mode1</key> <value>0</value> </param> <param> <key>corr1</key> <value>0</value> </param> <param> <key>freq1</key> <value>100e6</value> </param> <param> <key>gain_mode1</key> <value>False</value> </param> <param> <key>if_gain1</key> <value>20</value> </param> <param> <key>iq_balance_mode1</key> <value>0</value> </param> <param> <key>gain1</key> <value>10</value> </param> <param> <key>ant20</key> <value></value> </param> <param> <key>bb_gain20</key> <value>20</value> </param> <param> <key>bw20</key> <value>0</value> </param> <param> <key>dc_offset_mode20</key> <value>0</value> </param> <param> <key>corr20</key> <value>0</value> </param> <param> <key>freq20</key> <value>100e6</value> </param> <param> <key>gain_mode20</key> <value>False</value> </param> <param> <key>if_gain20</key> <value>20</value> </param> <param> <key>iq_balance_mode20</key> <value>0</value> </param> <param> <key>gain20</key> <value>10</value> </param> <param> <key>ant21</key> <value></value> </param> <param> <key>bb_gain21</key> <value>20</value> </param> <param> <key>bw21</key> <value>0</value> </param> <param> <key>dc_offset_mode21</key> <value>0</value> </param> <param> <key>corr21</key> <value>0</value> </param> <param> <key>freq21</key> <value>100e6</value> </param> <param> <key>gain_mode21</key> <value>False</value> </param> <param> <key>if_gain21</key> <value>20</value> </param> <param> <key>iq_balance_mode21</key> <value>0</value> </param> <param> <key>gain21</key> <value>10</value> </param> <param> <key>ant22</key> <value></value> </param> <param> <key>bb_gain22</key> <value>20</value> </param> <param> <key>bw22</key> <value>0</value> </param> <param> <key>dc_offset_mode22</key> <value>0</value> </param> <param> <key>corr22</key> <value>0</value> </param> <param> <key>freq22</key> <value>100e6</value> </param> <param> <key>gain_mode22</key> <value>False</value> </param> <param> <key>if_gain22</key> <value>20</value> </param> <param> <key>iq_balance_mode22</key> <value>0</value> </param> <param> <key>gain22</key> <value>10</value> </param> <param> <key>ant23</key> <value></value> </param> <param> <key>bb_gain23</key> <value>20</value> </param> <param> <key>bw23</key> <value>0</value> </param> <param> <key>dc_offset_mode23</key> <value>0</value> </param> <param> <key>corr23</key> <value>0</value> </param> <param> <key>freq23</key> <value>100e6</value> </param> <param> <key>gain_mode23</key> <value>False</value> </param> <param> <key>if_gain23</key> <value>20</value> </param> <param> <key>iq_balance_mode23</key> <value>0</value> </param> <param> <key>gain23</key> <value>10</value> </param> <param> <key>ant24</key> <value></value> </param> <param> <key>bb_gain24</key> <value>20</value> </param> <param> <key>bw24</key> <value>0</value> </param> <param> <key>dc_offset_mode24</key> <value>0</value> </param> <param> <key>corr24</key> <value>0</value> </param> <param> <key>freq24</key> <value>100e6</value> </param> <param> <key>gain_mode24</key> <value>False</value> </param> <param> <key>if_gain24</key> <value>20</value> </param> <param> <key>iq_balance_mode24</key> <value>0</value> </param> <param> <key>gain24</key> <value>10</value> </param> <param> <key>ant25</key> <value></value> </param> <param> <key>bb_gain25</key> <value>20</value> </param> <param> <key>bw25</key> <value>0</value> </param> <param> <key>dc_offset_mode25</key> <value>0</value> </param> <param> <key>corr25</key> <value>0</value> </param> <param> <key>freq25</key> <value>100e6</value> </param> <param> <key>gain_mode25</key> <value>False</value> </param> <param> <key>if_gain25</key> <value>20</value> </param> <param> <key>iq_balance_mode25</key> <value>0</value> </param> <param> <key>gain25</key> <value>10</value> </param> <param> <key>ant26</key> <value></value> </param> <param> <key>bb_gain26</key> <value>20</value> </param> <param> <key>bw26</key> <value>0</value> </param> <param> <key>dc_offset_mode26</key> <value>0</value> </param> <param> <key>corr26</key> <value>0</value> </param> <param> <key>freq26</key> <value>100e6</value> </param> <param> <key>gain_mode26</key> <value>False</value> </param> <param> <key>if_gain26</key> <value>20</value> </param> <param> <key>iq_balance_mode26</key> <value>0</value> </param> <param> <key>gain26</key> <value>10</value> </param> <param> <key>ant27</key> <value></value> </param> <param> <key>bb_gain27</key> <value>20</value> </param> <param> <key>bw27</key> <value>0</value> </param> <param> <key>dc_offset_mode27</key> <value>0</value> </param> <param> <key>corr27</key> <value>0</value> </param> <param> <key>freq27</key> <value>100e6</value> </param> <param> <key>gain_mode27</key> <value>False</value> </param> <param> <key>if_gain27</key> <value>20</value> </param> <param> <key>iq_balance_mode27</key> <value>0</value> </param> <param> <key>gain27</key> <value>10</value> </param> <param> <key>ant28</key> <value></value> </param> <param> <key>bb_gain28</key> <value>20</value> </param> <param> <key>bw28</key> <value>0</value> </param> <param> <key>dc_offset_mode28</key> <value>0</value> </param> <param> <key>corr28</key> <value>0</value> </param> <param> <key>freq28</key> <value>100e6</value> </param> <param> <key>gain_mode28</key> <value>False</value> </param> <param> <key>if_gain28</key> <value>20</value> </param> <param> <key>iq_balance_mode28</key> <value>0</value> </param> <param> <key>gain28</key> <value>10</value> </param> <param> <key>ant29</key> <value></value> </param> <param> <key>bb_gain29</key> <value>20</value> </param> <param> <key>bw29</key> <value>0</value> </param> <param> <key>dc_offset_mode29</key> <value>0</value> </param> <param> <key>corr29</key> <value>0</value> </param> <param> <key>freq29</key> <value>100e6</value> </param> <param> <key>gain_mode29</key> <value>False</value> </param> <param> <key>if_gain29</key> <value>20</value> </param> <param> <key>iq_balance_mode29</key> <value>0</value> </param> <param> <key>gain29</key> <value>10</value> </param> <param> <key>ant2</key> <value></value> </param> <param> <key>bb_gain2</key> <value>20</value> </param> <param> <key>bw2</key> <value>0</value> </param> <param> <key>dc_offset_mode2</key> <value>0</value> </param> <param> <key>corr2</key> <value>0</value> </param> <param> <key>freq2</key> <value>100e6</value> </param> <param> <key>gain_mode2</key> <value>False</value> </param> <param> <key>if_gain2</key> <value>20</value> </param> <param> <key>iq_balance_mode2</key> <value>0</value> </param> <param> <key>gain2</key> <value>10</value> </param> <param> <key>ant30</key> <value></value> </param> <param> <key>bb_gain30</key> <value>20</value> </param> <param> <key>bw30</key> <value>0</value> </param> <param> <key>dc_offset_mode30</key> <value>0</value> </param> <param> <key>corr30</key> <value>0</value> </param> <param> <key>freq30</key> <value>100e6</value> </param> <param> <key>gain_mode30</key> <value>False</value> </param> <param> <key>if_gain30</key> <value>20</value> </param> <param> <key>iq_balance_mode30</key> <value>0</value> </param> <param> <key>gain30</key> <value>10</value> </param> <param> <key>ant31</key> <value></value> </param> <param> <key>bb_gain31</key> <value>20</value> </param> <param> <key>bw31</key> <value>0</value> </param> <param> <key>dc_offset_mode31</key> <value>0</value> </param> <param> <key>corr31</key> <value>0</value> </param> <param> <key>freq31</key> <value>100e6</value> </param> <param> <key>gain_mode31</key> <value>False</value> </param> <param> <key>if_gain31</key> <value>20</value> </param> <param> <key>iq_balance_mode31</key> <value>0</value> </param> <param> <key>gain31</key> <value>10</value> </param> <param> <key>ant3</key> <value></value> </param> <param> <key>bb_gain3</key> <value>20</value> </param> <param> <key>bw3</key> <value>0</value> </param> <param> <key>dc_offset_mode3</key> <value>0</value> </param> <param> <key>corr3</key> <value>0</value> </param> <param> <key>freq3</key> <value>100e6</value> </param> <param> <key>gain_mode3</key> <value>False</value> </param> <param> <key>if_gain3</key> <value>20</value> </param> <param> <key>iq_balance_mode3</key> <value>0</value> </param> <param> <key>gain3</key> <value>10</value> </param> <param> <key>ant4</key> <value></value> </param> <param> <key>bb_gain4</key> <value>20</value> </param> <param> <key>bw4</key> <value>0</value> </param> <param> <key>dc_offset_mode4</key> <value>0</value> </param> <param> <key>corr4</key> <value>0</value> </param> <param> <key>freq4</key> <value>100e6</value> </param> <param> <key>gain_mode4</key> <value>False</value> </param> <param> <key>if_gain4</key> <value>20</value> </param> <param> <key>iq_balance_mode4</key> <value>0</value> </param> <param> <key>gain4</key> <value>10</value> </param> <param> <key>ant5</key> <value></value> </param> <param> <key>bb_gain5</key> <value>20</value> </param> <param> <key>bw5</key> <value>0</value> </param> <param> <key>dc_offset_mode5</key> <value>0</value> </param> <param> <key>corr5</key> <value>0</value> </param> <param> <key>freq5</key> <value>100e6</value> </param> <param> <key>gain_mode5</key> <value>False</value> </param> <param> <key>if_gain5</key> <value>20</value> </param> <param> <key>iq_balance_mode5</key> <value>0</value> </param> <param> <key>gain5</key> <value>10</value> </param> <param> <key>ant6</key> <value></value> </param> <param> <key>bb_gain6</key> <value>20</value> </param> <param> <key>bw6</key> <value>0</value> </param> <param> <key>dc_offset_mode6</key> <value>0</value> </param> <param> <key>corr6</key> <value>0</value> </param> <param> <key>freq6</key> <value>100e6</value> </param> <param> <key>gain_mode6</key> <value>False</value> </param> <param> <key>if_gain6</key> <value>20</value> </param> <param> <key>iq_balance_mode6</key> <value>0</value> </param> <param> <key>gain6</key> <value>10</value> </param> <param> <key>ant7</key> <value></value> </param> <param> <key>bb_gain7</key> <value>20</value> </param> <param> <key>bw7</key> <value>0</value> </param> <param> <key>dc_offset_mode7</key> <value>0</value> </param> <param> <key>corr7</key> <value>0</value> </param> <param> <key>freq7</key> <value>100e6</value> </param> <param> <key>gain_mode7</key> <value>False</value> </param> <param> <key>if_gain7</key> <value>20</value> </param> <param> <key>iq_balance_mode7</key> <value>0</value> </param> <param> <key>gain7</key> <value>10</value> </param> <param> <key>ant8</key> <value></value> </param> <param> <key>bb_gain8</key> <value>20</value> </param> <param> <key>bw8</key> <value>0</value> </param> <param> <key>dc_offset_mode8</key> <value>0</value> </param> <param> <key>corr8</key> <value>0</value> </param> <param> <key>freq8</key> <value>100e6</value> </param> <param> <key>gain_mode8</key> <value>False</value> </param> <param> <key>if_gain8</key> <value>20</value> </param> <param> <key>iq_balance_mode8</key> <value>0</value> </param> <param> <key>gain8</key> <value>10</value> </param> <param> <key>ant9</key> <value></value> </param> <param> <key>bb_gain9</key> <value>20</value> </param> <param> <key>bw9</key> <value>0</value> </param> <param> <key>dc_offset_mode9</key> <value>0</value> </param> <param> <key>corr9</key> <value>0</value> </param> <param> <key>freq9</key> <value>100e6</value> </param> <param> <key>gain_mode9</key> <value>False</value> </param> <param> <key>if_gain9</key> <value>20</value> </param> <param> <key>iq_balance_mode9</key> <value>0</value> </param> <param> <key>gain9</key> <value>10</value> </param> <param> <key>comment</key> <value></value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>args</key> <value></value> </param> <param> <key>_enabled</key> <value>1</value> </param> <param> <key>_coordinate</key> <value>(24, 272)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>rtlsdr_source_0</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>clock_source0</key> <value></value> </param> <param> <key>time_source0</key> <value></value> </param> <param> <key>clock_source1</key> <value></value> </param> <param> <key>time_source1</key> <value></value> </param> <param> <key>clock_source2</key> <value></value> </param> <param> <key>time_source2</key> <value></value> </param> <param> <key>clock_source3</key> <value></value> </param> <param> <key>time_source3</key> <value></value> </param> <param> <key>clock_source4</key> <value></value> </param> <param> <key>time_source4</key> <value></value> </param> <param> <key>clock_source5</key> <value></value> </param> <param> <key>time_source5</key> <value></value> </param> <param> <key>clock_source6</key> <value></value> </param> <param> <key>time_source6</key> <value></value> </param> <param> <key>clock_source7</key> <value></value> </param> <param> <key>time_source7</key> <value></value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>nchan</key> <value>1</value> </param> <param> <key>num_mboards</key> <value>1</value> </param> <param> <key>type</key> <value>fc32</value> </param> <param> <key>sample_rate</key> <value>samp_rate</value> </param> <param> <key>sync</key> <value></value> </param> </block> <block> <key>wxgui_fftsink2</key> <param> <key>avg_alpha</key> <value>0.8</value> </param> <param> <key>average</key> <value>True</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>True</value> </param> <param> <key>fft_size</key> <value>1024</value> </param> <param> <key>freqvar</key> <value>None</value> </param> <param> <key>_coordinate</key> <value>(1056, 56)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>wxgui_fftsink2_0</value> </param> <param> <key>notebook</key> <value>nb, 0</value> </param> <param> <key>peak_hold</key> <value>False</value> </param> <param> <key>ref_level</key> <value>-30</value> </param> <param> <key>ref_scale</key> <value>2.0</value> </param> <param> <key>fft_rate</key> <value>15</value> </param> <param> <key>samp_rate</key> <value>samp_rate</value> </param> <param> <key>title</key> <value>Baseband</value> </param> <param> <key>type</key> <value>complex</value> </param> <param> <key>win_size</key> <value></value> </param> <param> <key>win</key> <value>None</value> </param> <param> <key>y_divs</key> <value>10</value> </param> <param> <key>y_per_div</key> <value>10</value> </param> </block> <block> <key>wxgui_fftsink2</key> <param> <key>avg_alpha</key> <value>0.8</value> </param> <param> <key>average</key> <value>True</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>True</value> </param> <param> <key>fft_size</key> <value>1024</value> </param> <param> <key>freqvar</key> <value>None</value> </param> <param> <key>_coordinate</key> <value>(1056, 280)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>wxgui_fftsink2_0_0</value> </param> <param> <key>notebook</key> <value>nb, 1</value> </param> <param> <key>peak_hold</key> <value>False</value> </param> <param> <key>ref_level</key> <value>0</value> </param> <param> <key>ref_scale</key> <value>2.0</value> </param> <param> <key>fft_rate</key> <value>15</value> </param> <param> <key>samp_rate</key> <value>baseband_rate</value> </param> <param> <key>title</key> <value>FM Demod</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>win_size</key> <value></value> </param> <param> <key>win</key> <value>None</value> </param> <param> <key>y_divs</key> <value>10</value> </param> <param> <key>y_per_div</key> <value>10</value> </param> </block> <block> <key>wxgui_scopesink2</key> <param> <key>ac_couple</key> <value>False</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>(1056, 500)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>wxgui_scopesink2_1</value> </param> <param> <key>notebook</key> <value>nb,7</value> </param> <param> <key>num_inputs</key> <value>1</value> </param> <param> <key>samp_rate</key> <value>2375</value> </param> <param> <key>t_scale</key> <value>0</value> </param> <param> <key>title</key> <value>Scope Plot</value> </param> <param> <key>trig_mode</key> <value>wxgui.TRIG_MODE_AUTO</value> </param> <param> <key>type</key> <value>complex</value> </param> <param> <key>v_offset</key> <value>0</value> </param> <param> <key>v_scale</key> <value>0.4</value> </param> <param> <key>win_size</key> <value></value> </param> <param> <key>xy_mode</key> <value>True</value> </param> <param> <key>y_axis_label</key> <value>Counts</value> </param> </block> <connection> <source_block_id>analog_wfm_rcv_0</source_block_id> <sink_block_id>freq_xlating_fir_filter_xxx_1</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>analog_wfm_rcv_0</source_block_id> <sink_block_id>wxgui_fftsink2_0_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>blocks_complex_to_real_0</source_block_id> <sink_block_id>digital_binary_slicer_fb_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>blocks_keep_one_in_n_0</source_block_id> <sink_block_id>digital_diff_decoder_bb_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>digital_binary_slicer_fb_0</source_block_id> <sink_block_id>blocks_keep_one_in_n_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>digital_diff_decoder_bb_0</source_block_id> <sink_block_id>gr_rds_decoder_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>digital_mpsk_receiver_cc_0</source_block_id> <sink_block_id>blocks_complex_to_real_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>digital_mpsk_receiver_cc_0</source_block_id> <sink_block_id>wxgui_scopesink2_1</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>freq_xlating_fir_filter_xxx_0</source_block_id> <sink_block_id>analog_wfm_rcv_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>freq_xlating_fir_filter_xxx_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>freq_xlating_fir_filter_xxx_1</source_block_id> <sink_block_id>root_raised_cosine_filter_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_rds_decoder_0</source_block_id> <sink_block_id>gr_rds_parser_0</sink_block_id> <source_key>out</source_key> <sink_key>in</sink_key> </connection> <connection> <source_block_id>gr_rds_parser_0</source_block_id> <sink_block_id>gr_rds_panel_0</sink_block_id> <source_key>out</source_key> <sink_key>in</sink_key> </connection> <connection> <source_block_id>root_raised_cosine_filter_0</source_block_id> <sink_block_id>digital_mpsk_receiver_cc_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>rtlsdr_source_0</source_block_id> <sink_block_id>freq_xlating_fir_filter_xxx_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> </flow_graph>