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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/N2SBAS2FMVGSLUNSXK4GQJLWJ3EUHIF3/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "001c01d2d762$16fecd50$44fc67f0$@net", "message_id_hash": "N2SBAS2FMVGSLUNSXK4GQJLWJ3EUHIF3", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/N2SBAS2FMVGSLUNSXK4GQJLWJ3EUHIF3/?format=api", "sender": { "address": "tjschuessler (a) verizon.net", "mailman_id": "e00b615eeb1940c790a22f139add6462", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e00b615eeb1940c790a22f139add6462/emails/?format=api" }, "sender_name": "Tom Schuessler", "subject": "[amsat-bb] LilacSat-1 and Codec2", "date": "2017-05-28T03:25:40Z", "parent": null, "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/URORHV24WQC5GGGT5CXUQ4WUVXDH7WVJ/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "OK I'm NOT a Linux guy. Let's see if we can do LilacSat-1 for the rest of\nus.\n\nWhat I have been able to figure out is that Codec2 is a digital voice codec\nthat creates audio speech out of some input data. If I read things right,\nLilacSat-1's concept here is to take analog FM (PL tone of 67HZ to open it's\nsquelch), input and digitize the audio and then encode what it hears to\ndigital data using the Codec2 process. That data is transmitted on a 9600\ndata stream BPSK decoded by an application. I think that is a good basic\nexplanation of the system. A unique concept.\n\nNow back to not being a Linux person. I see the posts on the BB dealing\nwith folks using GNU radio to decode the data. GNU Radio which is a Linux\nDigital voice program apparently can be ported to Windows, but the install\nprocess is very touchy feely. My looking at pages about Codec2 I get\nreferences to the \"FreeDV\" program. I found they do have a Windows\ninstaller for FreeDV. Is that the accepted program for this purpose using\nCODEC2? After installing the FreeDV program, I see that there are different\nflavors of the Codec it uses, but only some of them seem to match what is\nnoted as flavors on the Codec2 development page. Which actual flavor is the\nLilacSat-1 system using?\n\nI intend to give this a listen sometime this long weekend to see if I can\ndecode anything. Should be interesting. Does anyone have raw downlink data\nsamples that I could use to test what the FreeDV program can \"hear\"?\n\nThanks for the insights.\n\nTom Schuessler, N5HYP\n\n", "attachments": [] }