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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MP4LWZQ56HWYEIIRXTHUMHXHDD644G4C/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAN6TEUewbS7bTBNQ25h1QireUnbuF_pRFvJZFvybCOH5cS-w6Q@mail.gmail.com",
    "message_id_hash": "MP4LWZQ56HWYEIIRXTHUMHXHDD644G4C",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CBTZVOOREPETPYRSXAKZ7EQX6WYIOQGM/?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] SDR Front End Protection and Spin Modulation Fading",
    "date": "2019-05-23T16:15:55Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CBTZVOOREPETPYRSXAKZ7EQX6WYIOQGM/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Mike!\n\nThe SDRplay receivers (all models) have front-end filtering across\nthe range they are capable of receiving. As long as you aren't\ntransmitting in the same band as you are receiving with an SDRplay,\nyou should be fine. If you want additional protection for the SDRplay\nwhen working satellites, a 2m/70cm diplexer can be put in front of\nthe SDRplay as another layer of protection. Again, the SDRplay is not\nprotected if you transmit on the same band it is being used to\nreceive. You won't need to run full power from your IC-7000 for\nsatellite work. As many use Yaesu's FT-817s and FT-818s to work\nsatellites, you will be able to scale back on the transmit power\nfrom your IC-7000. Once you get your station set up, you will be\nable to test and see how much power is sufficient.\n\nI normally use an Elk 2m/70cm log periodic for my satellite work.\nFor the SSB satellites, I must use a diplexer so the antenna is\nconnected to both radios. I have used SDRplay receivers, a FUNcube\nDongle Pro+ SDR receiver, and other radios (FT-817s, the all-mode\nreceivers in Kenwood TH-F6A and TH-D74 HTs, and all-mode receivers\nlike an AOR AR8200 and Icom's IC-R20 and IC-R30) in this manner.\nThe diplexer is another layer of protection for whatever radio I\nuse as a receiver, along with ensuring I never transmit on the\nsame band I am receiving with the second radio or SDR receiver.\n\nAs for the Alaskan Arrow compared to the standard Arrow, you will\nhave more gain with the Alaskan Arrow. You will have to be more\naccurate in pointing the antenna at the satellites, as the increased\ngain reduces the beamwidth from the larger antenna. With any antenna\nused at a fixed orientation, you will occasionally have fading that\nyou'll have to deal with. Signals will fade out, then fade back in.\n\nGood luck, and 73!\n\n\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\nTwitter: @WD9EWK or http://twitter.com/WD9EWK\n\n\n\n\n\nOn Thu, May 23, 2019 at 3:35 PM Mike N8MR via AMSAT-BB <[email protected]>\nwrote:\n\n> I have an SDRplay RSP1 that I’d like to use as a downlink receiver, along\n> with an Arrow 146/437-10 antenna and Yaesu G-5400 az/el rotators. Uplink\n> will be an Icom IC-7000. Using this setup, will the SDRplay need a Front\n> End Protector to keep it from overloading? If so, which ones are\n> recommended?\n>\n> Also, I am considering upgrading the antenna to an Alaskan Arrow. Is there\n> a noticeable improvement in antenna performance and gain between the\n> standard Arrow and the Alaskan? Would the improvement in gain also result\n> in deeper fading during spin modulation?\n>\n> 73,\n> Mike, N8MR\n>\n>\n",
    "attachments": []
}