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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2Z7A5WEGVPR2PSWGKAPKRAKLPEGGCPFF/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJCSnOZiu4RUz32C1R2S2BsiFikg__DxQayx4JJUxHrHXP6SOQ@mail.gmail.com",
    "message_id_hash": "2Z7A5WEGVPR2PSWGKAPKRAKLPEGGCPFF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/2Z7A5WEGVPR2PSWGKAPKRAKLPEGGCPFF/",
    "sender": {
        "address": "scott23192 (a) gmail.com",
        "mailman_id": "120e10e05ba14969a11da0a96d21e355",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/120e10e05ba14969a11da0a96d21e355/emails/"
    },
    "sender_name": "Scott",
    "subject": "[amsat-bb] ISS Packet Frequency?",
    "date": "2017-04-24T22:20:02Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DJPCI7P3MNKJRTUYUYD4QN2S4VUD46PD/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi everybody.\n\nThis is essentially a request for what I believe the scientific folks call\n\"peer review\"...\n\nI continue to try to understand why none of my equipment has been receiving\nthe ISS digipeater very well since the switch back to 2 meters, despite the\nfact that the same hardware does well on terrestrial packet and in the case\nof 145.825 in particular, I have even received packets from PSAT since\nre-configuring for VHF reception on my Raspberry Pi / RTL-SDR iGate.  So,\nmy point is that it isn't that NOTHING is working on 2-meter packet or\n145.825 here.  And as I've mentioned in the past, I hear from others with\nsimilar stories so we're not sharing hardware or location.\n\nThis evening there was a favorable pass here and I see on ariss.net that\nseveral stations were digipeated while the ISS was over the U.S.  Great\nnews!\n\nI monitored that pass in receive-only mode with the same type of TXCO\nversion-3 RTL-SDR that I use for my iGate.  The results were very strange\nand I hope incorrect.  I certainly would appreciate it if someone might\nrepeat my test when time permits.\n\nHere is an image showing my SDR tuned to the local NOAA Weather Radio on\n162.475.  By all appearances, my frequency display is accurate in the VHF\nband.\n\nhttps://www.dropbox.com/s/w1dll06xwinteap/NOAA-Wx-Radio-on-freq.png?raw=1\n\n\n... without changing any settings other than frequency, the following image\nshows a Spectra-Vue plot of my reception of the packet transmissions from\nthe ISS on this evening's pass:\n\nhttps://www.dropbox.com/s/s46o3pi87yk9t2h/spec-view.png?raw=1\n\n\n... I took a ballpark stab at the center point of closest approach and\nunless I did something awfully wrong, it's roughly 5 KHz above the expected\n145.825 frequency.  If by any chance this is accurate, it explains why I've\nbeen seeing poor reception here.\n\n(On the other hand, if my observations are completely wrong and flawed,\nthis makes just over 1000 times that I've looked foolish!)\n\nAnyway, if anyone is setup to make similar observations, I would imagine\nthat we would all like to know if there is a frequency issue up there.  If\nnot, then of course I'm sorry to tie up the mailing list!\n\n73!\n\n-Scott,  K4KDR\nMontpelier, VA  USA\n",
    "attachments": []
}