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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KLJHNSTQLM7K5MUTP2MFC4HTBU62IUYM/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "KLJHNSTQLM7K5MUTP2MFC4HTBU62IUYM",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QS4ZNLSO25FWR4LQYKRNIYRQWKS6ROD4/?format=api",
    "sender": {
        "address": "jbarbre (a) xmission.com",
        "mailman_id": "18023d66cd594af58c2b4ec345a13240",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/18023d66cd594af58c2b4ec345a13240/emails/?format=api"
    },
    "sender_name": "Jim Barbre",
    "subject": "Re: [amsat-bb] RTL-SDR downlink",
    "date": "2016-06-16T21:27:29Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ACKP4PUUQW4GZDXTOXZCSL4Y6G4ZCDQK/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The Airspy Mini sells for $114. Worth looking into.\n\n73\nJim Barbre\nKB7YSY\n\nOn 6/16/2016 1:22 PM, Patrick STODDARD (WD9EWK/VA7EWK) wrote:\n> Hi, (name or call?)!\n>\n> The inexpensive RTL-SDR dongles are a great way to get started with\n> SDR receivers. For amateur satellite work, other than the ISS and maybe\n> AO-85, they have a couple of significant drawbacks...\n>\n> 1. These dongles were designed to be TV receivers, working with\n> signals much stronger than we have from our satellites or even the\n> ISS ham station.\n>\n> 2. These dongles lack front-end filtering. This means that there could\n> be a strong signal near you that swamps the receiver that wipes out\n> what you're trying to hear. If you are trying to work satellites\n> full-duplex, it is possible that your transmitter will shut down\n> the dongle until you end your transmission. This was a problem I\n> experienced early on when I tried using one of these dongles as\n> my downlink receiver, and quickly moved on to something else.\n>\n> Unfortunately there isn't anything in the middle ground between these\n> dongles and devices like the SDRplay (sold by HRO in the US for $149)\n> or the FUNcube Dongle Pro+ (sold by its UK manufacturer for around\n> $200 depending on exchange rates, which includes FedEx next-day\n> shipping from England to most addresses in the continental USA). Both\n> of these devices do well as the downlink receiver for working\n> satellites. Both come with front-end filtering that the RTL-SDR\n> dongles lack, and still have sensitive receivers. The SDRplay\n> has a low-noise amplifier that is engaged when receiving at VHF or\n> higher, but you can reduce the amount of gain from the built-in LNA.\n> For my work, I keep that gain reduction value set to 0, so I have\n> maximum gain to hear the downlinks.\n>\n> Good luck, and 73!\n>\n>\n>\n>\n>\n> Patrick WD9EWK/VA7EWK\n> http://www.wd9ewk.net/\n> Twitter: @WD9EWK\n>\n>\n>\n>\n>\n>\n",
    "attachments": []
}