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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NWYRNCXRUJ55WWLTNGWIFXBDKSLSY7A6/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAN6TEUeUnMYUOkzDx7Xui_c=SHgX_t+6orMQwSHPCwpppb6=FA@mail.gmail.com",
    "message_id_hash": "NWYRNCXRUJ55WWLTNGWIFXBDKSLSY7A6",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IQ2M7GBPXN33JS6RVBKXMKHSOZLZXMWL/?format=api",
    "sender": {
        "address": "amsat-bb (a) wd9ewk.net",
        "mailman_id": "21664df01bef4757931b7cdb42a9e768",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/21664df01bef4757931b7cdb42a9e768/emails/?format=api"
    },
    "sender_name": "Patrick STODDARD (WD9EWK/VA7EWK)",
    "subject": "Re: [amsat-bb] Yaesu FT-857D",
    "date": "2016-01-22T20:08:49Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RLEDQPIV3CVXR7L7UEPV7YX6NRWE7GSE/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi!\n\nI have been using SDR receivers as part of my satellite work\nfor a little while now, and have used (or tried to use) a\nfew of them...\n\n\"RTL-SDR\" dongles (the $20 or so dongles)\nFUNcube Dongle Pro (original version)\nFUNcube Dongle Pro+ (current version)\nSDRplay\nHackRF (One and Blue versions)\n\nThe RTL-type dongles and the FUNcube Dongle Pro (not the\nPro+) lack front-end filtering, which rendered them useless\nwhen I tried to transmit with either an HT or FT-817 in\nclose proximity - even with there was a diplexer in front\nof the SDR devices. These devices would basically shut down\nuntil I ended my transmissions, when they would resume working.\nThe newer R820T2 type of the RTL dongles may have better\nstability, but they all seem to lack front-end filtering that\nwould be desired when working our satellites.\n\nThe FUNcube Dongle Pro+ and SDRplay work well as the downlink\nreceiver when I have worked satellites. These devices cost\nmore than the RTL-SDR dongles, but they come with front-end\nfiltering that helps greatly when they operate near your\nuplink transmitter. I have had success with both of these\ndevices, along with HDSDR (the Windows software I prefer to\nuse when working satellites with SDR receivers) running on\na laptop or small Windows 8.1/10 tablet. I currently prefer\nto use the SDRplay as my downlink receiver when I am working\nsatellites, but will occasionally use the FUNcube Dongle Pro+\nfrom time to time. The SDRplay currently retails at US$ 149\nfrom either HRO stores or the www.sdrplay.com web site located\nin the UK. The FUNcube Dongle Pro+ costs around US$ 190 to\nUS$ 200 including FedEx shipping from the UK, depending on the\nexchange rate.\n\nThe FUNcube Dongle Pro+ is supported by the FUNcube Dashboard\nsoftware for FUNcube satellites like AO-73, and the FoxTelem\nsoftware for AO-85 and the upcoming Fox-1 satellites. If I use\nmy SDRplay to decode telemetry, I would need to pipe the\nreceived audio through a virtual audio cable into those\nprograms before telemetry can be decoded by either of those\nprograms.\n\nI have both the commercially-made HackRF One and the crowd-\nfunded HackRF Blue devices. These are broadband transceivers\nthat are capable of receiving at bandwidths up to 20 MHz. I\nhave not tried using either of these when working satellites,\nmainly due to the lack of front-end filtering in these devices.\nHDSDR only supports using a HackRF device as a receiver, and\nI have not tried using either of these as a transmitter. The\nHackRF devices are capable of transmitting at low-milliwatt\nranges across the spectrum they cover (officially 1 MHz to 6\nGHz, but many have been able to lower the low end of that range\nto 100 kHz or so). The HackRF One retails at around US$ 300,\ndepending on which reseller you buy from.\n\nMy recommendation would be to go either with a FUNcube Dongle\nPro+ or SDRplay. Both are in the same price range, and work\nwell as part of a station for working our satellites. These\nmay cost a lot more than the cheap RTL-SDR dongles, but it\nis better to know the limitations of the low-end devices up\nfront, instead of getting frustrated with them later on. The\ncheaper dongles can work well for receive-only applications,\nprovided you are not near strong sources of RF (including\nyour own transmissions), but I think the FUNcube Dongle Pro+\nor SDRplay would work well alongside the original poster's\nFT-857.\n\nNow if there was a software-defined transceiver capable of\nworking our satellites full-duplex, without the need for\nupconverters/downconverters/transverters to cover 2m and 70cm,\nI'd be interested. Until then, I am OK with using an FT-817\n(or similar radio) with an SDR receiver and software running\non a tablet. I wrote articles about using these SDR devices\nwith Windows tablets that ran in the AMSAT Journal and\nAMSAT-UK's OSCAR News in the past year. Those articles are\navailable in PDFs from my Dropbox space:\n\nhttp://dropbox.wd9ewk.net/\n\n(go to the Articles folder, then look for the files with SDR\nin the file names)\n\n73!\n\n\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\nTwitter: @WD9EWK\n\n\n\n\nOn Fri, Jan 22, 2016 at 12:10 PM, John Toscano <[email protected]> wrote:\n\n> Mentioning that you are waiting for a tax refund makes me think you are\n> planning to dive into SDR with a fairly high-end and expensive unit, You\n> can probably get away with spending $25 or so if you have reasonably modest\n> expectations. Noo Elec makes a whole line of SDR devices, from inexpensive\n> dongles to the pricier (but well worth it if you have the passion) HackRF\n> unit. Take a look here:\n>   http://www.nooelec.com/store/sdr.html\n>\n> There are some dongle vendors who sell junk. the Noo Elec units are high\n> quality. Of course, take that recommendation from someone who owns one of\n> their dongles, plus HackRF Blue board (clone of the HackRF and virtually\n> unobtainable now), and a Flex-1500.\n> ;^)\n> 73 de W0JT/5, EL09vu\n>\n>\n",
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}