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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EPZL5L3O6E45WN73U2JLQJY3FKJWLKAI/?format=api",
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    "message_id": "[email protected]",
    "message_id_hash": "EPZL5L3O6E45WN73U2JLQJY3FKJWLKAI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/WHC52MWVUH6A3N5O25RARIXLPJZ4MQXX/?format=api",
    "sender": {
        "address": "ai6do (a) yahoo.com",
        "mailman_id": null,
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    },
    "sender_name": "Ryan Noguchi",
    "subject": "Re: [amsat-bb] Protecting SDR",
    "date": "2019-01-11T17:12:33Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/46MFW5BDKLQHDUSXM3US3TMZE3FCT6DY/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NYLLURUALGD3ZEA2FRKVAHJ2XOZP4RWL/?format=api"
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    "content": " Is a transmit/receive switch necessary, or would a simple duplexer suffice? Something like the MFJ-916B offers 55dB or better isolation, and fairly low loss (0.2dB). It's a lot cheaper and more convenient to set up. \n\nMy SDRPlay RSP1A arrived yesterday and I got it and my FT-857D working with CAT control using SatPC32 last night. I haven't worked a pass with it yet, though; maybe this weekend. The RSP1A is rated for 0dBm continuous, 10dBm momentary. The antenna is a dual-band Elk in the attic on a TV rotator, so there is no benefit of interantenna isolation. If I assume the duplexer's spec value of 55dB isolation, that would attenuate even 250W input down to less than 0dBm, correct? Patrick WD9EWK had commented on the subject of SDR protection in a QRZ.com posting, and has used a duplexer instead of a T/R switch with his SDRPlay SDR: https://forums.qrz.com/index.php?threads/kenwood-ts-2000-in-full-duplex-mode-on-single-coax-line.605225/#post-4613865\n\nWould love to know if my math is wrong, if the RSP1A's spec isn't trustworthy, and/or if there are any other considerations that make a transmit/receive switch better (or necessary) than just a duplexer, before I let the magic smoke escape. \n\nThanks and 73, Ryan AI6DO\n\n    On Friday, January 11, 2019, 8:31:34 AM PST, saguaroastro <[email protected]> wrote:  \n \n Kevin,\nI've be looking at this. MFJ-1708. There are several versions. So look the up on Hro to compare\n\n\n73Rick Tejera (K7TEJ)Saguaro Astronomy ClubWww.saguaroastro.orgThunderbird Astronomy ClubWww.w7tbc.org\n\n-------- Original message --------From: Kevin Zari <[email protected]> Date: 1/11/19  06:40  (GMT-07:00) To: [email protected] Subject: [amsat-bb] Protecting SDR \nFor those of you with an SDR dongle, for example the Funcube Pro +,  how do you protect it from not being damaged by TX energy? I’m thinking of hooking mine up to the 70cm antenna in my M2 LEO pack while I TX on the 2m antenna and was afraid I’d overload the SDR. I see folks using them for their RX on linear birds, so I’m just wondering how you have them hooked up.  \nThanks in advance for your advice.  \n\n-Kevin (KK4YEL) \n\n\n  \n",
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