I tried multiple methodes to see if I can get consistent frames when trying to decode BEESAT-1 and haven't found a way. The following obs is used https://network.satnogs.org/observations/10288495/ the IQ is available in this directory as also the ogg audio file. gr_satellites BEESAT-1.yml \ --rawint16 iq_48000_10288495.wav --samp_rate 48e3 --iq --clk_bw 0.3 Produces no frames. gr_satellites BEESAT-1.yml \ --rawint16 iq_48000_10288495.wav --samp_rate 48e3 --iq --clk_bw 0.3 --use_agc * MESSAGE DEBUG PRINT PDU VERBOSE * ((transmitter . 4k8 FSK downlink) . 1) pdu_length = 296 contents = 0000: 14 10 24 57 c5 ed d2 78 f5 97 63 22 1e 98 10 a2 0010: ea 3c aa b0 4d 3d 6a d0 48 40 53 f2 38 44 4a 6f 0020: 47 cc 0a 1a 5d 84 37 1e 94 f5 7b f0 e9 27 4a b4 0030: df 05 59 d4 2e 63 b6 5c 55 7a fb 98 9d e1 99 65 0040: da c8 18 bc a8 e5 bd 97 57 04 97 f1 16 e1 92 3f 0050: f2 4c 0a 85 b6 ac 2f ec a4 bc 49 5c 31 57 3f 83 0060: fe 4b 27 01 67 8c 45 60 35 77 8e d2 3e 0a 16 6b 0070: 00 2b 05 c5 9c 02 31 c1 01 07 1b fe 0f d6 e4 d0 0080: 56 1e 9c ad a0 8d 05 87 0e 85 55 08 01 ff 68 2a 0090: 01 4d c6 ea 27 4c 55 df 91 ca 04 bc 42 2f e5 89 00a0: fb e3 76 1a bc 3c 81 8d 0d e1 aa d0 06 67 f9 f2 00b0: 24 82 ce 22 d8 49 fa 84 32 4d 57 ff d0 49 27 83 00c0: cb 8b 6d 7b 8b 87 42 c2 c7 3c ae ad f0 df 45 ed 00d0: 8a e3 e0 99 cf 28 26 7c fd 4f ef 83 f2 71 c3 fe 00e0: 94 7c 70 0e 80 f5 54 1c 60 f9 25 77 c0 7c 1e 23 00f0: 22 c1 1d 6b c3 47 b2 aa 61 2c e6 42 99 ba 1b 79 0100: d3 38 c5 d5 d8 aa 82 6f 38 94 6c 28 0a 75 d2 91 0110: 89 db cb 7d ac 8b c5 4e de d2 d1 41 93 97 dc a5 0120: 57 35 aa ff ff 00 00 bb *********************************** * MESSAGE DEBUG PRINT PDU VERBOSE * ((transmitter . 4k8 FSK downlink) . 1) pdu_length = 368 contents = 0000: 1d 14 5a f4 c1 dd b3 e4 2f 46 57 01 3e a5 01 a8 0010: a8 8c df 2b 24 a3 a1 67 76 05 c9 b3 38 5e a8 6b 0020: 28 f7 82 3f c0 fb e0 08 dd 89 66 9b 33 6d 8d 0a 0030: 0c 16 51 58 ca bb 95 96 da 1e fb d3 71 88 62 bf 0040: ce 6e 33 b8 f3 4d 00 b3 fd f5 cc e9 b9 32 4e 36 0050: f5 29 aa d2 f2 00 74 d6 41 5f 04 1d 09 47 e0 95 0060: 07 e6 c8 fd 30 52 a3 4c ce dc 4c 5a fb be 6b 17 0070: bc fe fc c9 6c 2f ab 90 4c ee 95 0a 20 86 e3 2d 0080: fb fd df 66 1f 0d f9 fe 97 df a3 31 9e 61 ac f7 0090: c8 77 23 69 24 cf 7d 78 d6 77 12 72 59 5a fe 48 00a0: aa 76 4b 96 05 1d 06 9a a1 df 42 a1 d3 69 64 ba 00b0: 4a cd 05 dc bf d0 85 65 30 0b af ec db 6f df d5 00c0: 93 2c 4b 12 0e f1 1e 1d 76 dc ec 79 dc ae f6 5c 00d0: 20 8b 86 cd 11 65 20 c6 4a f6 a8 81 e2 5f f2 b7 00e0: bc 73 9c 91 49 36 26 9e e8 9e 38 05 26 d3 65 79 00f0: 01 6b 58 9a 85 68 cb 02 b6 93 f9 5e 87 66 de a9 0100: 25 85 b4 26 66 0b e0 b0 a9 3b 2f ab a4 98 57 e4 0110: 4b 6d 6b 3d ab 58 be 77 cc 00 68 e6 7f c0 9c 23 0120: 79 52 64 55 f9 0d 04 0a 90 01 4a 0b f0 40 a5 a1 0130: 68 cd f7 a7 f2 1c 7a ea b3 c1 14 19 6e d9 a7 f1 0140: cf b8 45 b4 18 dd ad f4 79 4b 09 8e 98 29 5b b2 0150: 1b 20 ec c6 d9 c0 3e a7 fb ed 42 4e fc 80 96 2b 0160: 0e 17 c3 9b 2b bd 4e 3b fb 03 aa ff ff 0f 00 bb *********************************** * MESSAGE DEBUG PRINT PDU VERBOSE * ((transmitter . 4k8 FSK downlink) . 1) pdu_length = 296 contents = 0000: a8 10 ba 67 ff ee 4b 48 b5 39 4d 6f 45 01 a0 45 0010: b9 b6 5f 77 bd 1d c7 5f 1d 10 23 47 6e 3d 15 95 0020: ae c9 c9 57 f2 9e d3 9c 39 d2 2d 48 e6 74 1c d1 0030: 51 2b 98 f8 53 25 21 2f 7f 16 04 24 0c d8 c6 2a 0040: 1b a7 b3 47 7d d9 63 a7 3b 66 78 44 d2 ea 36 2c 0050: 3b 02 4b 5c 17 2c 1a e9 52 89 83 58 68 c5 89 da 0060: 4e 39 3b d3 9a 50 ae 14 85 dd 98 cc 6d a3 13 c5 0070: ad 63 9d 8f 3d a5 11 96 ef f1 e7 61 20 0c f7 b8 0080: a5 10 0a 38 5a f6 27 da df bf 3b 46 1e 5a 25 b7 0090: d2 63 a5 87 82 d6 68 03 98 2d 88 d7 65 38 06 56 00a0: fd b0 a4 6a 50 d6 45 8f 1c 01 4a ae 29 f0 d1 ea 00b0: db 34 6f e1 7a d1 eb 9f f8 c1 d2 8d de 59 39 ae 00c0: f6 ca 55 50 1a 4b 85 6b 7d 21 96 31 b6 6d ea 24 00d0: 91 4c 98 86 20 e8 57 1a cb 56 0e 0f 1d f8 ab 1a 00e0: 0c 9f c1 19 a8 25 9c 8f 2e 54 8c 53 dc 37 51 0a 00f0: f3 12 75 f0 fa 88 b6 a6 19 53 00 9b 12 33 e9 d7 0100: af 93 c4 e7 81 3c 2d 0f 86 cc 3d c7 e9 c9 1b 25 0110: 95 0e a0 c8 27 73 29 ee 25 df b1 36 b6 ed df 41 0120: 5d 01 aa ff ff 00 00 bb *********************************** This gives me the impression that I need to find the correct --deviation but even after multiple tries I haven't found a way to get a similar as with the --use_agc option. When I compare the frames with the ones from UZ7HO they are completely different. UZ7HO output 1: [MOBITEX] [16:24:41R] CTRL: 1406 NR_blocks: 32 block0: 1A CF FC 1D 0B E0 72 98 18 00 00 00 00 98 00 7D A8 11 FEC_err: 0 block1: 9B 1F 9B 98 CA 22 A8 B0 05 FC 06 75 11 90 11 90 06 00 FEC_err: 0 block2: 00 00 00 03 44 F0 46 50 44 C4 0E 43 00 00 23 00 00 00 FEC_err: 0 block3: 00 3D 03 E8 00 5A 2E 83 ED 40 00 00 01 FD 01 00 00 00 FEC_err: 0 block4: 67 03 00 00 2A E6 70 00 00 00 00 FF 00 00 0F 70 0A 40 FEC_err: 1 block5: 48 A0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FEC_err: 0 block6: 00 00 00 00 BF 04 56 B9 63 1D B7 C6 5C 34 56 A0 00 14 FEC_err: 0 block7: FE 97 01 42 00 01 0A 40 39 D0 4D 90 00 20 19 50 00 00 FEC_err: 2 block8: 1A CF FC 1D FF FF 72 20 18 00 00 03 40 0E 00 7D 2E 83 FEC_err: 0 block9: ED 38 00 00 01 F6 01 8B 01 8A 01 8D 01 9E 00 E1 00 E1 FEC_err: 0 block10: 00 E1 00 E0 01 B3 01 8B 01 9A 01 A0 01 70 01 71 01 71 FEC_err: 0 block11: 01 73 07 86 06 FB 07 16 06 D2 06 10 05 FB 06 1D 06 26 FEC_err: 0 block12: 02 8D 02 93 02 9D 00 EE 04 8D 07 76 09 9C 09 73 08 1B FEC_err: 0 block13: 04 9E 07 0A 07 59 07 AC 00 01 00 00 00 19 00 00 00 00 FEC_err: 0 block14: 00 00 04 4E 04 66 04 4B 03 43 02 91 01 96 01 97 01 9B FEC_err: 0 block15: 00 A5 00 A1 00 A5 00 00 13 00 E0 44 60 46 B4 44 00 00 FEC_err: 0 block16: 1A CF FC 1D FF FF 72 20 18 00 00 03 40 0E 00 7D 2E 83 FEC_err: 0 block17: ED 38 00 00 01 F6 01 8B 01 8A 01 8D 01 9E 00 E1 00 E1 FEC_err: 0 block18: 00 E1 00 E0 01 B3 01 8B 01 9A 01 A0 01 70 01 71 01 71 FEC_err: 1 block19: 01 73 07 86 06 FB 07 16 06 D2 06 10 05 FB 06 1D 06 26 FEC_err: 0 block20: 02 8D 02 93 02 9D 00 EE 04 8D 07 76 09 9C 09 73 08 1B FEC_err: 0 block21: 04 9E 07 0A 07 59 07 AC 00 01 00 00 00 19 00 00 00 00 FEC_err: 0 block22: 00 00 04 4E 04 66 04 4B 03 43 02 91 01 96 01 97 01 9B FEC_err: 0 block23: 00 A5 00 A1 00 A5 00 00 13 00 E0 44 60 46 B4 44 00 00 FEC_err: 0 block24: 1A CF FC 1D FF FF 72 20 18 00 00 03 40 0E 00 7D 2E 83 FEC_err: 0 block25: ED 38 00 00 01 F6 01 8B 01 8A 01 8D 01 9E 00 E1 00 E1 FEC_err: 0 block26: 00 E1 00 E0 01 B3 01 8B 01 9A 01 A0 01 70 01 71 01 71 FEC_err: 0 block27: 01 73 07 86 06 FB 07 16 06 D2 06 10 05 FB 06 1D 06 26 FEC_err: 1 block28: 02 8D 02 93 02 9D 00 EE 04 8D 07 76 09 9C 09 73 08 1B FEC_err: 1 block29: 04 9E 07 0A 07 59 07 AC 00 01 00 00 00 19 00 00 00 00 FEC_err: 0 block30: 00 00 04 4E 04 66 04 4B 03 43 02 91 01 96 01 97 01 9B FEC_err: 0 block31: 00 A5 00 A1 00 A5 00 00 13 00 E0 44 60 46 B4 44 00 00 FEC_err: 0 All blocks successfully decoded!