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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6PXMQNP2ZDNVPO4WJTKKNGTMMPVJMHZY/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAN6TEUevaRBUs3i=3dqk9+93dJcgNDWn6jis0m5M9GajxhDu1g@mail.gmail.com",
    "message_id_hash": "6PXMQNP2ZDNVPO4WJTKKNGTMMPVJMHZY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/6PXMQNP2ZDNVPO4WJTKKNGTMMPVJMHZY/?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": "[amsat-bb] SDRplay RSP as downlink receiver",
    "date": "2015-08-30T22:05:20Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi!\n\nIn July, I ordered an SDRplay RSP SDR receiver from the SDRplay web site:\n\nhttp://www.sdrplay.com/\n\nThis is an SDR receiver that covers from 100 kHz to 2 GHz without gaps,\nat bandwidths from 200 kHz up to 8 MHz. There is front-end filtering\nacross the entire range this radio covers - something that caught my eye\nfor use as a satellite downlink receiver with an FT-817ND. At US$ 149 plus\nshipping from the UK, it is a good value. It is a small box, larger than\nthe FUNcube Dongle Pro+ I have been using for some time. After some issues\ngetting this device working on Windows 8.1 and 10 tablets, resolved with a\nnew API installer, I have been testing my SDRplay on my 8- and 10-inch\ntablets - now running Windows 10, after being upgraded earlier this month.\n\nOver this weekend, after installing the new API and ExtIO drivers needed\nfor HDSDR to see the SDRplay receiver, I wanted to try it to work satellites.\nI made an attempt on Friday evening, during an AO-73 pass. Although I could\nhear the satellite, I could not hear myself with the SDRplay and HDSDR. I\nwent back to the documentation and the different interfaces in HDSDR that\ncontrol the SDRplay, and I figured out the issue. SDRplay's ExtIO driver\nassumes the user will want to reduce the amount of gain in the receiver,\nwhere I want as much as I can get for working satellites. After making some\nchanges, I successfully worked another AO-73 pass this morning. I made two\nQSOs, with Leo W7JPI in southern Arizona and Brad KG7NXH a few miles/km\nsoutheast of me in the Phoenix area. Other than the normal delay I hear\nfrom the SDR receiver and software (I hear the same sort of delay when I use\nmy FUNcube Dongle Pro+), the SDRplay receiver did a good job.\n\nAs I have done when using my FUNcube dongle, I made an RF recording of this\npass in HDSDR. That WAV file is big - for an 8:35 recording, it was about\n450 MB in size. I also made an audio recording, in the same way I would if\nI used my second FT-817ND as the downlink receiver - audio splitter plugged\ninto the tablet, feeding audio to both my headset/mic and Sony digital audio\nrecorder. With these tablets, I find that the performance of HDSDR is very\npoor when it is trying to write both AF and RF recordings. Since I can make\nan AF recording away from the tablet, I let HDSDR do the RF recording.\n\nThe default bandwidth used by the SDRplay receiver is 1.536 MHz. It can go\nup to 8 MHz, but my tablets have issues when the bandwidth is more than the\n1.536 MHz default value. When I work our satellites, whether using my\ntablets or a laptop, I'll probably go with the 200 kHz bandwidth. This is\nall I really need, and this will help keep the RF recordings from taking\nover the drives in the tablets and laptop. :-)\n\nI have been posting more details about how I have been using the SDRplay to\nwork satellites in a QRZ.com satellite forum thread. That thread is at:\n\nhttps://forums.qrz.com/index.php?threads/sdrplay-as-satellite-downlink-receiver.490793/\n\nMy HDSDR RF recording, along with screenshots and photos of my station, I\nhave put them in my Dropbox space, accessible at:\n\nhttps://www.dropbox.com/sh/6nl39qjkfyw5y5h/AADynnchNPayKAnU0XYwl3TCa?lst\n\nI am not planning on selling my FUNcube Dongle Pro+. It is still a good SDR\nreceiver for working our satellites. It is smaller than the SDRplay, it works\nwith the FUNcube Dashboard software, and sales of the dongle support the\nFUNcube project. It is nice that there is another SDR device that is showing\npromise as a downlink receiver for our satellites, and at a reasonable price.\n\n73!\n\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\nTwitter: @WD9EWK\n",
    "attachments": []
}