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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/COWAI3YSRPWTMJ2QN7LXB7RE4DZC4EZS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAOsf+NS1BO4-UTL9G9Z1PVufjNyKxR0EuULrR+dW-R0SSfRqiA@mail.gmail.com",
    "message_id_hash": "COWAI3YSRPWTMJ2QN7LXB7RE4DZC4EZS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OPSX2PKSQGMYZDSGXIG5RPNE2XQQKFMS/?format=api",
    "sender": {
        "address": "w2hro.fn20 (a) gmail.com",
        "mailman_id": "56ad9360da124e679a8e571628e4a15d",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/56ad9360da124e679a8e571628e4a15d/emails/?format=api"
    },
    "sender_name": "Paul Andrews",
    "subject": "Re: [amsat-bb] FT-991A Transmit Interference",
    "date": "2018-08-03T16:59:35Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OC4PKK4RYKJL7KM6L2GGIVUKA5RPF6YH/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "This is very likely a IM3 issue.  Shielding won't help.  You need to\nsurpress the IM3 on the 2M output.\n\nI have a torpedo sized cavity filter that knocks down the IM3 by 40 dB and\nI see no desense.\n\nGL - 73 - Paul - W2HRO\n\nOn Fri, Aug 3, 2018, 12:11 Patrick STODDARD (WD9EWK/VA7EWK) <\[email protected]> wrote:\n\n> Zach,\n>\n> The RF shielding isn't over components on the circuit board. The\n> inside of the RSP1A's plastic case has metallic paint which serves\n> as the shielding. From the same review you cited at:\n>\n> https://www.rtl-sdr.com/a-review-of-the-sdrplay-rsp1a/\n>\n> \"Like the RSP2 the plastic case is now spray painted with metallic\n> paint on the inside. This works almost as well as a full metal\n> case to shield from unwanted signals entering directly through the\n> PCB, instead of through the antenna. We do still notice some\n> leakage making its way in through the coax shield, but it is\n> relatively minor with the shielding.\"\n>\n> I have used my RSP1A to receive satellite downlinks, and have not\n> experienced issues as VA3ASE mentioned. I'm not using an FT-991 or\n> FT-991A, but use a variety of other radios (HTs, IC-2730A, FT-817,\n> TM-D710G) for the uplink side of my station with the RSP1A and a\n> tablet with HDSDR for the downlink.\n>\n> 73!\n>\n>\n>\n>\n> Patrick WD9EWK/VA7EWK\n> http://www.wd9ewk.net/\n> Twitter: @WD9EWK or http://twitter.com/WD9EWK\n>\n>\n>\n>\n>\n> On Fri, Aug 3, 2018 at 3:50 PM, Zach Metzinger <[email protected]> wrote:\n>\n> > On 8/3/18 10:07 AM, VA3ASE wrote:\n> >\n> > Zach my understanding is that the RSP1A is still shielded despite the\n> >> plastic box, but I actually have access to an RSP2pro in a metal case\n> that\n> >> I can try out as well. I've never heard of a USB EMI filter before, I'll\n> >> look into that. I'm using a quality TrippLite USB cable with molded\n> chokes\n> >> at each end.\n> >>\n> >\n> > Hello Alex,\n> >\n> > Based on the pictures shown in the review located at the following URL,\n> > there does not appear to be any shielding over any RF component.\n> >\n> > https://www.rtl-sdr.com/a-review-of-the-sdrplay-rsp1a/\n> >\n> > --- Zach\n> > N0ZGO\n> >\n> >\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n",
    "attachments": []
}