Hai, Habr.
Pada bagian
sebelumnya , decoding sinyal RDS untuk stasiun radio FM dipertimbangkan, dan ide artikel selanjutnya muncul dengan sendirinya - Anda perlu membuat pemancar FM Anda sendiri.
Akan ada dua opsi - sederhana, dan lebih kompleks, dengan RDS.
Seperti pada kasus sebelumnya, kami akan melakukan semua ini di GNU Radio tanpa menulis satu baris kode pun. Bagi yang berminat, lanjutkan di bawah cut.
Jadi mari kita mulai. Tentu saja, untuk pengujian kita membutuhkan SDR dengan kemampuan untuk mentransfer (HackRF, USRP, LimeSDR).
Pemancar fm
Skema pemancar sederhana dilakukan dalam hampir dua klik, dan saya harap tidak ada kesulitan dalam memahami. Saya menggunakan file WAV sebagai sumber, meskipun Anda dapat menggunakan sumber lain jika Anda ingin, misalnya, input kartu suara.
Sebenarnya, ada dua blok kunci dalam skema ini - pemancar WBFM dan Resampler, yang mengubah laju sampel aliran. Semua nilai frekuensi pengambilan sampel harus saling berhubungan, jika tidak akan ada lompatan sampel, yang akan didengar sebagai klik oleh telinga. Blok Multiply Const digunakan untuk menyesuaikan level input. Penting juga untuk tidak bingung, di Radio GNU ada dua blok berbeda untuk FM - WBFM dan NBFM. Kami membutuhkan yang pertama, Wide Band FM. Modulasi NFM digunakan untuk radio portabel.
Secara umum, semuanya sederhana, kita mulai, itu berfungsi. Tidak ada blok UI di sirkuit, sehingga Anda dapat menggunakannya juga dari baris perintah (lebih banyak di bagian
4 ).
Omong-omong, jika Anda melihat spektrumnya, Anda dapat memastikan bahwa sinyal mono sederhana ditransmisikan, tanpa saluran, nada pilot dan hal-hal lainnya.
Saatnya beralih ke opsi yang lebih kompleks.
Pemancar dengan RDS
Sirkuit pemancar dengan RDS tentu saja akan lebih rumit. Asalnya diambil dari
contoh gr-rds dengan perubahan kecil (versi asli untuk Windows tidak berfungsi, versi "benar" di bagian bawah artikel), kami akan mempertimbangkan komponen apa yang terdiri.
(asli dalam
resolusi penuh )
Sepertiga teratas dari rangkaian adalah transmisi RDS. Pada input ada encoder RDS, yang, berdasarkan data yang tersedia (nama stasiun, kode negara, dll.), Menghasilkan paket RDS. Kemudian bitstream mengalami
pengkodean diferensial , gagasannya adalah untuk menghapus urutan berulang dari bentuk 001000001. Kemudian sinyal diproses dan gelombang pembawa pada 57KHz dimodulasi olehnya. Bagian sentral adalah penciptaan suara. Di sini saluran L + R dan LR terbentuk. Bawah sebagai sumber suara adalah file .wav. Akhirnya, blok Tambah menambahkan semua ini bersama-sama, dan nada pilot 19KHz dan nada 38KHz kedua ditambahkan ke sinyal. Semua sinyal total ini dikirim ke modulator frekuensi, semua ini dikirim melalui SDR ke udara.
Secara teori, skema ini tidak 100% lengkap, misalnya, tidak ada blok predistorsi, fase nada pada 19, 38 dan 57 kHz tidak disinkronkan. Di sisi lain, untuk memahami bagaimana suara disiarkan secara umum, skema semacam itu sudah cukup, mereka yang ingin dapat memodifikasinya sendiri.
Saat memulai, jendela terbuka, beberapa parameter dapat diubah.
Ada keinginan untuk menguji RDS dengan penerima sungguhan, tetapi ternyata radio FM sudah atavisme, dan saya tidak memilikinya di rumah. Bahkan di smartphone model terbaru, ia juga hilang. Jadi saya harus menggunakan RTL-SDR V3 dan GQRX sebagai penerima kontrol, hasilnya ada di KDPV.
Tentu saja, sebelum pengujian perlu memilih frekuensi bebas sehingga tidak ada stasiun di atasnya, dan disarankan untuk tidak melebihi daya yang diizinkan. Bagi mereka yang ingin mendapatkan jangkauan maksimum,
Anda dapat membeli amplifier , disarankan untuk membuat antena pada frekuensi yang diinginkan sehingga setidaknya ada panjang gelombang 1/4 dipol.
Kesimpulan
Seperti yang Anda lihat, pada prinsipnya, tidak ada yang super rumit dalam mentransmisikan radio FM, semuanya benar-benar layak di Radio GNU (meskipun tidak akan mudah untuk mengulanginya tanpa contoh, mengingat bahwa sistem tidak didokumentasikan sama sekali). Nah sekarang, setidaknya para pembaca punya contoh yang bagus.
Kode sumber dari blok di bawah spoiler.
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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> </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> 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<sink_key>0</sink_key> </connection> </flow_graph>
Dan seperti biasa, semua percobaan berhasil. Dan jangan sampai mengganggu stasiun radio lainnya.