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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7W5T2FHDVOQFFZOVZ46OYDLUGKRAPVK5/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "7W5T2FHDVOQFFZOVZ46OYDLUGKRAPVK5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YUKH4DQ77SUSHNVLE4ZNNW6R2PFZPWJD/?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": "Re: [amsat-bb] FM signal on FO-29?",
    "date": "2015-11-08T23:40:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FCUTNR4P5F7XWMP3NEKQF4JX4UJT6IJW/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "That makes sense Hector.  I've seen the FM activity kind of all over the \ntransponder. More so than I would expect if it was the same transmitter \neach time on the same frequency and the different pass geometries \ncausing a bit of swing due to doppler.\n\n\n-Zach, KJ4QLP\n\nOn 11/08/2015 06:34 PM, Hector W5CBF/CO6CBF wrote:\n> Hi Zach and group\n>\n> I think, the main problem is they are not always the same stations. I have\n> heard several different stations in terrestrial QSOs QRMing  FO-29; majority\n> of them speaking Spanish and without any kind of ID. I have not heard them\n> recently, though.\n>\n> 73!\n>\n> Hector, CO6CBF/W5CBF\n>\n> -----Mensaje original-----\n> De: AMSAT-BB [mailto:[email protected]] En nombre de Zach Leffke\n> Enviado el: Sunday, November 08, 2015 4:54 PM\n> Para: [email protected]\n> Asunto: Re: [amsat-bb] FM signal on FO-29?\n>\n> well.. when I say students, I meant graduate students at VT that happened to\n> be in the lab when I was doing the experiment.  They work with me and Bob,\n> so a few crude words here and there aren't uncommon to them.\n>\n> But good point, probably not the best thing for a public demo if your\n> audience is a bit younger.\n>\n> Actually, I've seen so much FM activity (basically every time I've monitored\n> FO-29 since we first came online in late september) that I've been toying\n> with the idea of trying to locate where the source emitters actually are\n> located based on doppler shift data.  We know the doppler between the\n> receiving ground station and FO-29, so we can back that out.  We know the\n> transponder mapping, so we can work through that to determine what the\n> center frequency is as the signal enters the transponder uplink receiver.\n> What we don't know is the uplink doppler, because we don't know where the\n> emitter is and we don't know what exact center frequency they are on (but I\n> bet you its in 5kHz steps, maybe 2.5kHz).  So we have two unknowns.  I'm\n> betting there's a way to work through it though, and with enough\n> observations and by watching the rate of change of the doppler, I bet\n> there's a way to make an educated guess on what their center freq and\n> location are.\n>\n> Or if someone listening knows Spanish and/or Portugese, maybe we could get\n> lucky and hear what cross streets the taxi is going to (if it is in fact a\n> taxi).\n>\n> -Zach, KJ4QLP\n>\n> On 11/08/2015 05:30 PM, Clayton W5PFG wrote:\n>> I wouldn't recommend playing the FM audio heard via FO-29 to a group\n>> of children. Normally it's not English.  It's most likely NOT a\n>> religious broadcast based on their choice of crude words.\n>>\n>> 73\n>> Clayton\n>> W5PFG\n>>\n>> On 11/8/2015 16:13, Zach Leffke wrote:\n>>> So yes, in the last couple weeks I've seen a LOT of FM activity on\n>>> FO-29.  And based on my experience with Friday's pass, which was\n>>> ascending, I'm leading towards the Central/South America QRM theory.\n>>> Lots of strong FM activity as the pass started and the satellite was\n>>> over the lower latitudes, but as FO-29 ascended over higher latitudes\n>>> towards the north pole, the FM activity died down.\n>>>\n>>> -Zach, KJ4QLP\n>> _______________________________________________\n>> Sent via [email protected]. AMSAT-NA makes this open forum available\n>> to all interested persons worldwide without requiring membership.\n>> Opinions expressed\n>> are solely those of the author, and do not reflect the official views\n>> of AMSAT-NA.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite\n>> program!\n>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available to all\n> interested persons worldwide without requiring membership. Opinions\n> expressed are solely those of the author, and do not reflect the official\n> views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
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