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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6N3DVCGUDQFVI3JQLJUHO7337OBTSA46/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "6N3DVCGUDQFVI3JQLJUHO7337OBTSA46",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/6N3DVCGUDQFVI3JQLJUHO7337OBTSA46/?format=api",
    "sender": {
        "address": "zleffke (a) vt.edu",
        "mailman_id": "57a24afb1cf641f98121841e6753c12e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/57a24afb1cf641f98121841e6753c12e/emails/?format=api"
    },
    "sender_name": "Zach Leffke",
    "subject": "[amsat-bb] Help Needed: GNU Radio + FoxTelem",
    "date": "2015-10-08T17:20:38Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IMUNHCEB6RBQVA7ZU6L7KJ4VIDOPWKBZ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Everyone,\n     I am frantically rushing to get GNU Radio to 'play nice' with \nfoxtelem.  I'm running all linux here.  I'm hoping someone can maybe \nthrow me a few pointers on getting the fox telem software to work with \nexternal SDR applications.  I'm attempting to pipe signals from GNU \nRadio in three ways, all met with failure:\n\nFirst is by running an FM receiver flowgraph and then trying to pipe the \naudio out via a Linux FIFO using the 'Wav File Sink' block in GR.  I \npoint the SDR flowgraph to my pipe, and then I point the FoxTelem \nsoftware to the same pipe and fire the programs up.  I've successfully \nused this method in the past to feed a sound streaming application that \n\"thinks\" is reading from a standard wav file, but is actually the GR \nflowgraph audio output.  GNU Radio seems to run for a second or two \n(probably the amount of time it takes to fill the buffer) then the Fox \nTelem Software crashes with exceptions:\n\n'javax.sound.sampled.UnsupportedAudioFileException:  could not get the \naudio input stream from input file.'\n\nIn gnu radio I'm using the wav file sink with a single port and sample \nrate of 48k and 16bits.  This \"appears\" to match what FoxTelem is \nexpecting, but I'm getting the crashes.\n\nAn alternative method I'm attempting is to use a standard audio sink in \ngnuradio (I can hear the audio on my laptop speakers) and then try to \npipe that into the fox sw with a virtual audio cable.  I'm attempting to \nuse JACK and qjackctl, but I have little experience with this and so far \nhave failed to get it to do anything other than listen to the soundcard \nmic and line in ports.  If someone knows of a simple to use Virtual \nAudio Cable for Linux so that I can pipe the audio via the sound card \nthat would be great and I can give that a go.\n\nThe third method I'm trying to get working is by placing the fox sw in \nIQ mode and again attempting to use a 'wave file source' in foxtelem \npointed at a FIFO to pipe the IQ data from GNU radio into foxtelem.  \nagain I get the exception mentioned above.  This would be the preferred \nmethod in my case over the audio piping.  If someone has any experience \nwith this that would be great.  For those familiar with GNU Radio I'm \ntaking the complex stream (250ksps), reesampling to 192ksps, converting \nto float, then taking the real and complex streams and feeding them into \na 'Wav file sink' with TWO ports pointed at the fifo, again with 16 bit \ndepth and set to 192ksps.  Foxtelem is looking for a wav file at \n192ksps.  I'm hoping the two port file sink allows I data on the right \nchannel (in0) and Q data on the left channel (in1).\n\n\nAny and all pointers would be welcome.\n\nThanks,\nZach, KJ4QLP\n",
    "attachments": []
}