Хабрахабр

Software Defined Radio — как это работает? Часть 9

Привет Хабр.

В предыдущей части было рассмотрено декодирование сигналов RDS для FM-радиостанций, и идея следующей статьи возникла сама собой — нужно сделать свой собственный FM-трансмиттер.
Вариантов будет два — простой, и более сложный, с RDS.

Для тех кому интересно, продолжение под катом. Как и в предыдущих случаях, сделаем мы все это в GNU Radio, не написав ни одной строчки кода.

Разумеется, для тестов нам понадобится SDR с возможностью передачи (HackRF, USRP, LimeSDR). Итак, приступим.

FM трансмиттер

Схема простого трансмиттера делается практически в два клика, и надеюсь, никаких сложностей в понимании не представляет. В качестве источника я использую WAV-file, хотя при желании можно использовать и другой источник, например вход звуковой карты.

Все значения частоты дискретизации должны соответствовать друг другу, иначе будет пропуск семплов, что на слух будет слышно как щелчки. Собственно, ключевых блоков в этой схеме два — WBFM-трансмиттер и Resampler, преобразующий частоту дискретизации потока. Также важно не перепутать, в GNU Radio есть два разных блока для FM — WBFM и NBFM. Блок Multiply Const используется для регулировки входного уровня. Модуляция NFM используется для портативных радиостанций. Нам нужен именно первый, Wide Band FM.

Никаких UI-блоков в схеме нет, так что использовать ее можно и из командной строки (подробнее в 4й части). В общем, все просто, запускаем, работает.

Кстати, если посмотреть спектр, то можно убедиться, что передается простой моно сигнал, без каких-либо каналов, пилот-тонов и прочего.

Пора перейти к более сложному варианту.

Трансмиттер с RDS

Схема передатчика с RDS будет разумеется, посложнее. Ее оригинал был взят из примеров gr-rds с небольшими изменениями (оригинальная версия под Windows не заработала, «правильная» версия внизу статьи), рассмотрим, из каких компонентов она состоит.

(оригинал в полном разрешении)

На входе имеется RDS-энкодер, который исходя из имеющихся данных (имя станции, код страны и пр) формирует RDS-пакеты. Верхяя треть схемы — это передача RDS. Затем сигнал обрабатывается, и им модулируется «несущая» на 57КГц. Затем битовый поток подвергается дифференциальному кодированию, идея которого — убрать повторяющиеся последовательности вида 001000001. Тут формируются каналы L+R и L-R. Центральная часть — создание звука. И наконец, блок Add складывает все это вместе, также к сигналу добавляется пилот-тон на 19КГц и второй тон на 38КГц. Снизу в качестве источника звука указан WAV-файл. Весь этот суммарный сигнал отправляется на частотный модулятор, все это с помощью SDR отправляется в эфир.

С другой стороны, для понимания того, как вообще звук передается в эфир, такой схемы вполне достаточно, желающие могут доработать ее самостоятельно. По идее, эта схема не является 100% полной, например нет блока предыскажений, фазы тонов на 19, 38 и 57КГц не синхронизированы.

При запуске открывается окно, часть параметров можно менять.

Даже в смартфоне последней модели оно тоже отсутствует. Было желание протестировать RDS с реальным приемником, но оказалось что FM-радио — это уже атавизм, и у меня дома его нет. Так что пришлось использовать RTL-SDR V3 и GQRX в качестве контрольного приемника, результат на КДПВ.

Для тех же, кто захочет получить максимум дальности можно докупить усилитель, желательно сделать антенну на нужную частоту, чтобы был хотя бы диполь 1/4 длины волны. Разумеется, перед тестированием необходимо выбрать свободную частоту, чтобы на ней не было станций, ну и желательно не превышать разрешенную мощность.

Заключение

Как можно видеть, в передаче FM-радио в принципе, нет ничего сверхсложного, все вполне реализуемо в GNU Radio (хотя без наличия примеров повторить такое было бы непросто, учитывая что система не документирована вообще никак). Ну теперь, по крайней мере, работающий пример у читателей есть.

Исходные коды блоков под спойлером.

fm_tx.grc

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<value></value> </param> <param> <key>time_source7</key> <value></value> </param> <param> <key>nchan</key> <value>1</value> </param> <param> <key>num_mboards</key> <value>1</value> </param> <param> <key>samp_rate</key> <value>320000</value> </param> <param> <key>hide_cmd_port</key> <value>False</value> </param> <param> <key>hide_lo_controls</key> <value>True</value> </param> <param> <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> <connection> <source_block_id>analog_wfm_tx_0</source_block_id> <sink_block_id>uhd_usrp_sink_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>blocks_multiply_const_vxx_0</source_block_id> <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>

fm_tx_rds.grc

<?xml version='1.0' encoding='utf-8'?>
<?grc format='1' created='3.7.11'?>
<flow_graph> <timestamp>Thu Aug 28 08:28:15 2014</timestamp> <block> <key>options</key> <param> <key>author</key> <value></value> </param> <param> <key>window_size</key> <value>1600, 2048</value> </param> <param> <key>category</key> <value>RDS</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>(104, 4)</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_tx</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>variable</key> <param> <key>comment</key> <value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(352, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>data_rate</value> </param> <param> <key>value</key> <value>380000</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>(440, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>fm_max_dev</value> </param> <param> <key>value</key> <value>80e3</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>(264, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>freq</value> </param> <param> <key>value</key> <value>95.6e6</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>.75</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(544, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>input_gain</value> </param> <param> <key>label</key> <value></value> </param> <param> <key>max</key> <value>10</value> </param> <param> <key>min</key> <value>0</value> 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<value>wx.SL_HORIZONTAL</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>.05</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(800, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>rds_gain</value> </param> <param> <key>label</key> <value></value> </param> <param> <key>max</key> <value>3</value> </param> <param> <key>min</key> <value>0</value> </param> <param> <key>notebook</key> <value></value> </param> <param> <key>num_steps</key> <value>100</value> </param> <param> <key>style</key> <value>wx.SL_HORIZONTAL</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>.45</value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(672, 4)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>grid_pos</key> <value></value> </param> <param> <key>id</key> <value>stereo_gain</value> </param> <param> <key>label</key> <value></value> </param> <param> <key>max</key> <value>3</value> </param> <param> <key>min</key> <value>0</value> </param> <param> <key>notebook</key> <value></value> </param> <param> <key>num_steps</key> <value>100</value> </param> <param> <key>style</key> <value>wx.SL_HORIZONTAL</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>input_gain</value> </param> <param> <key>affinity</key> <value></value> </param> <param> <key>_enabled</key> 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<key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>blocks_repeat_0</value> </param> <param> <key>interp</key> <value>160</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>vlen</key> <value>1</value> </param> </block> <block> <key>blocks_socket_pdu</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>(24, 148)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>host</key> <value></value> </param> <param> <key>id</key> <value>blocks_socket_pdu_0</value> </param> <param> <key>mtu</key> <value>10000</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>port</key> <value>52001</value> </param> <param> <key>tcp_no_delay</key> <value>False</value> </param> <param> <key>type</key> <value>"TCP_SERVER"</value> </param> </block> <block> <key>blocks_throttle</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>(232, 764)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>blocks_throttle_1</value> </param> <param> <key>ignoretag</key> <value>True</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>samples_per_second</key> <value>48000</value> </param> <param> <key>type</key> <value>float</value> </param> <param> <key>vlen</key> <value>1</value> </param> </block> <block> <key>blocks_throttle</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>(240, 812)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>blocks_throttle_2</value> </param> <param> <key>ignoretag</key> <value>True</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> <param> <key>samples_per_second</key> <value>48000</value> </param> <param> <key>type</key> <value>float</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> 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<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>(824, 172)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_map_bb_0</value> </param> <param> <key>map</key> <value>[-1,1]</value> </param> <param> <key>maxoutbuf</key> <value>0</value> </param> <param> <key>minoutbuf</key> <value>0</value> </param> </block> <block> <key>digital_map_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>(576, 172)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_map_bb_1</value> </param> <param> <key>map</key> <value>[1,2]</value> </param> <param> 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<value></value> </param> <param> <key>_enabled</key> <value>True</value> </param> <param> <key>_coordinate</key> <value>(768, 360)</value> </param> <param> <key>_rotation</key> <value>0</value> </param> <param> <key>id</key> <value>gr_multiply_xx_1</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>gr_rds_encoder</key> <param> <key>af1</key> <value>89.8e6</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>_coordinate</key> <value>(160, 96)</value> </param> <param> <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> 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<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> 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<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> </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> <param> <key>clock_source7</key> <value></value> </param> <param> <key>sd_spec7</key> <value></value> </param> <param> <key>time_source7</key> <value></value> </param> <param> <key>nchan</key> <value>1</value> </param> <param> <key>num_mboards</key> <value>1</value> </param> <param> <key>samp_rate</key> <value>500000</value> </param> <param> <key>hide_cmd_port</key> <value>False</value> </param> <param> <key>hide_lo_controls</key> <value>True</value> </param> <param> <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> <value>wxgui_fftsink2_0</value> </param> <param> <key>notebook</key> <value></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>30</value> </param> <param> <key>samp_rate</key> <value>data_rate</value> </param> <param> <key>title</key> <value>FFT Plot</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>20</value> </param> </block> <connection> <source_block_id>blocks_multiply_const_vxx_0</source_block_id> <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_multiply_const_vxx_0_0</source_block_id> <sink_block_id>gr_add_xx_1</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>blocks_multiply_const_vxx_0_0_1</source_block_id> <sink_block_id>gr_add_xx_1</sink_block_id> <source_key>0</source_key> <sink_key>1</sink_key> </connection> <connection> <source_block_id>blocks_multiply_const_vxx_0_1</source_block_id> <sink_block_id>rational_resampler_xxx_0_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>blocks_repeat_0</source_block_id> <sink_block_id>low_pass_filter_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>blocks_socket_pdu_0</source_block_id> <sink_block_id>gr_rds_encoder_0</sink_block_id> <source_key>pdus</source_key> <sink_key>rds in</sink_key> </connection> <connection> <source_block_id>blocks_throttle_1</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>blocks_throttle_2</source_block_id> <sink_block_id>blocks_multiply_const_vxx_0_1</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_throttle_1</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_throttle_2</sink_block_id> <source_key>1</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_add_xx_0</source_block_id> <sink_block_id>low_pass_filter_0_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_add_xx_1</source_block_id> <sink_block_id>gr_frequency_modulator_fc_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_add_xx_1</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>gr_char_to_float_0</source_block_id> <sink_block_id>blocks_repeat_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_diff_encoder_bb_0</source_block_id> <sink_block_id>gr_map_bb_1</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_frequency_modulator_fc_0</source_block_id> <sink_block_id>rational_resampler_xxx_1</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_map_bb_0</source_block_id> <sink_block_id>gr_char_to_float_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_map_bb_1</source_block_id> <sink_block_id>gr_unpack_k_bits_bb_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_multiply_xx_0</source_block_id> <sink_block_id>blocks_multiply_const_vxx_0_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_multiply_xx_1</source_block_id> <sink_block_id>gr_add_xx_1</sink_block_id> <source_key>0</source_key> <sink_key>2</sink_key> </connection> <connection> <source_block_id>gr_rds_encoder_0</source_block_id> <sink_block_id>gr_diff_encoder_bb_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_sig_source_x_0</source_block_id> <sink_block_id>gr_multiply_xx_1</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_sig_source_x_0_0</source_block_id> <sink_block_id>gr_multiply_xx_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_sig_source_x_0_1</source_block_id> <sink_block_id>blocks_multiply_const_vxx_0_0_1</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_sub_xx_0</source_block_id> <sink_block_id>low_pass_filter_0_0_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>gr_unpack_k_bits_bb_0</source_block_id> <sink_block_id>gr_map_bb_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>low_pass_filter_0</source_block_id> <sink_block_id>gr_multiply_xx_0</sink_block_id> <source_key>0</source_key> <sink_key>1</sink_key> </connection> <connection> <source_block_id>low_pass_filter_0_0</source_block_id> <sink_block_id>gr_add_xx_1</sink_block_id> <source_key>0</source_key> <sink_key>3</sink_key> </connection> <connection> <source_block_id>low_pass_filter_0_0_0</source_block_id> <sink_block_id>gr_multiply_xx_1</sink_block_id> <source_key>0</source_key> <sink_key>1</sink_key> </connection> <connection> <source_block_id>rational_resampler_xxx_0</source_block_id> <sink_block_id>gr_add_xx_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>gr_sub_xx_0</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection> <connection> <source_block_id>rational_resampler_xxx_0_0</source_block_id> <sink_block_id>gr_add_xx_0</sink_block_id> <source_key>0</source_key> <sink_key>1</sink_key> </connection> <connection> <source_block_id>rational_resampler_xxx_0_0</source_block_id> <sink_block_id>gr_sub_xx_0</sink_block_id> <source_key>0</source_key> <sink_key>1</sink_key> </connection> <connection> <source_block_id>rational_resampler_xxx_1</source_block_id> <sink_block_id>uhd_usrp_sink</sink_block_id> <source_key>0</source_key> <sink_key>0</sink_key> </connection>
</flow_graph>

И как обычно, всем удачных экспериментов. И не создавайте помехи другим радиостанциям.

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