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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6R2OMHC54KYAO5ZIBLLI7KXPD3SVO6ZT/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "67E9D9C4D35343209FB0B4637399EE99@kb2m4PC",
    "message_id_hash": "6R2OMHC54KYAO5ZIBLLI7KXPD3SVO6ZT",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/UOBABV3YUNGOCQFPOSPE2CINK5XRZN4R/",
    "sender": {
        "address": "jeff_griffin (a) comcast.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Jeff",
    "subject": "Re: [amsat-bb] Satellite SDR: Seeing IS NOT Hearing",
    "date": "2017-03-25T18:48:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UOBABV3YUNGOCQFPOSPE2CINK5XRZN4R/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Clayton, are you sure you weren't listening to SO-50 :-)\n\n\n73 Jeff kb2m\n\n-----Original Message----- \nFrom: Clayton Coleman\nSent: Saturday, March 25, 2017 2:29 PM\nTo: AMSAT-BB\nSubject: [amsat-bb] Satellite SDR: Seeing IS NOT Hearing\n\nI happen to be a fan of using Software Defined Radio (SDR) to receive\namateur satellites. It is an inexpensive way to view all the signals\nappearing on a satellite's passband simultaneously.  While I don't\nnormally run SDR full time at my station, from time to time I use it\nto monitor activity on busy satellite passes because I can view and\nrecord all activity.\n\nAs a result of more people using SDR on satellites, I have discovered\nan operating trait that warrants some discussion and evaluation.\n\nOn more than one occasion, I have given a call to a very specific\nstation, and instead of my intended target had another SDR-based\nstation appear on frequency immediately saying \"QRZ? QRZ?\" rather than\nwait and listen to who is calling on the frequency. The SDR user saw a\nsignal on their waterfall and clicked on it. They \"pounced\" on what\nthey perceived to be another station looking to make contact which\nmight not necessarily be the case.\n\nI've see the same thing happen a few times with pileups.  There is an\nexisting pileup in progress when the SDR station comes into the\nfootprint. Rather than wait a short period to listen, they click on\nthe new signal in their waterfall, and immediately proceed to \"QRZ\" on\nthe frequency of the pileup, sometimes interrupting the flow of\nexisting contacts.\n\nJust today I heard this scenario: Station 1 calls CQ.  Station 2 went\nto answer. The SDR user clicked on the waterfall, heard only part of\nthe callsign of Station 2, and proceeded to call Station 2, ignoring\nthe possibility that Station 2 was attempting to QSO with someone\nelse.\n\nIt seems to me the visual nature of SDR waterfalls is causing a\ntemporary lapse in judgement when it comes to a basic ham radio\nprinciple that we apply to satellite operating -- listen with our ears\nbefore transmitting.\n\nSDR is a great listening tool. With great power comes great responsibility.\n\n73\nClayton\nW5PFG\n_______________________________________________\nSent via [email protected]. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions \nexpressed\nare solely those of the author, and do not reflect the official views of \nAMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb \n\n",
    "attachments": []
}