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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Q2RJC5WWFXRBAFANOB4RVELGB62KTT2B/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "Q2RJC5WWFXRBAFANOB4RVELGB62KTT2B",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RXHHWHHTC66QKT3ZQHJF2YAODLFC6NWC/?format=api",
    "sender": {
        "address": "wb4gcs (a) amsat.org",
        "mailman_id": "87014499e012476c8198fad186f7f963",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/87014499e012476c8198fad186f7f963/emails/?format=api"
    },
    "sender_name": "Jim Sanford",
    "subject": "[eagle] Re: IF switching",
    "date": "2006-09-24T03:16:24Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/276J2UH4FPKGXUP2CJ3DV5JMXMOIREHK/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Lou:\nMakes sense; please provide some more detail.   A drawing and loss \nfigures would be useful.\n\nThanks & 73,\nJim\[email protected]\n\n\nLouis McFadin wrote:\n\n>It seems to me that a more reliable design would avoid relays to  \n>switch between the Gain and the Omni antennas. It would be better to  \n>use directional couplers that feed the signals from both antennas to  \n>the receivers.\n>Relays have to be commanded and can fail. A coupler is doing it's  \n>thing all the time.\n>\n>On Sep 23, 2006, at 1:47 PM, John B. Stephensen wrote:\n>\n>  \n>\n>>I think that the L band receiver could be used for multiple  \n>>purposes --  command, linear transponder uplink and digital  \n>>transponder uplink. See the attached diagram.\n>>\n>>73,\n>>\n>>John\n>>KD6OZH\n>>\n>>----- Original Message ----- From: \"Rick Hambly (W2GPS)\"  \n>><[email protected]>\n>>To: \"'John B. Stephensen'\" <[email protected]>\n>>Cc: \"'EAGLE'\" <[email protected]>\n>>Sent: Saturday, September 23, 2006 16:15 UTC\n>>Subject: RE: [eagle] Re: IF switching\n>>\n>>\n>>    \n>>\n>>>John,\n>>>\n>>>We should have omni antennas for perigee commanding. That tends to  \n>>>work when\n>>>all else fails.\n>>>\n>>>Rick\n>>>W2GPS\n>>>AMSAT LM2232\n>>>\n>>>\n>>>-----Original Message-----\n>>>From: [email protected] [mailto:[email protected]] On  \n>>>Behalf Of\n>>>John B. Stephensen\n>>>Sent: Saturday, September 23, 2006 12:10 PM\n>>>To: Robert McGwier\n>>>Cc: 'EAGLE'\n>>>Subject: [eagle] Re: IF switching\n>>>\n>>>Bob:\n>>>\n>>>In Mirek's design there is an L-band receiver PCB and a command  \n>>>receiver or\n>>>command detector PCB mounted in one module. The two connect via  \n>>>the 10.7 MHz\n>>>\n>>>IF. Command detectors could be connected to both the U and L  \n>>>receivers.\n>>>\n>>>Are you suggesting one L receiver connected to an omni antenna and  \n>>>used only\n>>>\n>>>for the command link and a second L receiver connected to a gain  \n>>>antenna and\n>>>\n>>>only used for the transponders? A smaller solution would be one L  \n>>>receiver\n>>>with an antenna relay.\n>>>\n>>>73,\n>>>\n>>>John\n>>>KD6OZH\n>>>\n>>>----- Original Message ----- From: \"Robert McGwier\"  \n>>><[email protected]>\n>>>To: \"Robert McGwier\" <[email protected]>\n>>>Cc: \"'EAGLE'\" <[email protected]>\n>>>Sent: Saturday, September 23, 2006 04:25 UTC\n>>>Subject: [eagle] Re: IF switching\n>>>\n>>>\n>>>      \n>>>\n>>>>Robert McGwier wrote:\n>>>>        \n>>>>\n>>>>>Robert McGwier wrote:\n>>>>>\n>>>>>          \n>>>>>\n>>>>>>The downlinks in Lyle's SDX block diagram are two-fold.  S and  \n>>>>>>V.  The\n>>>>>>only change I would make for Eagle is to make both of them  \n>>>>>>HELAPS. This\n>>>>>>might prevent both of them being used simultaneously as HELAPS  \n>>>>>>but it\n>>>>>>might not.  We might choose to do a \"delay only\" version of the  \n>>>>>>HELAPS\n>>>>>>for the second transmitter.\n>>>>>>\n>>>>>>I would like to suggest that we use Mirek's command receiver to  \n>>>>>>feed the\n>>>>>>exact same command receive technology to be used for P3E and  \n>>>>>>that is the\n>>>>>>SDR/FIQ channel on the IHU-3.   The less work we have to  \n>>>>>>repeat, the\n>>>>>>better.  I believe we should have stand alone command receivers\n>>>>>>independent of the transponder antennas.  I would like to hear  \n>>>>>>from John\n>>>>>>\n>>>>>>\n>>>>>>            \n>>>>>>\n>>>>>Errrrr.    Uhhhh.  We might need antennas.  I meant independent  \n>>>>>of the\n>>>>>transponder receiver antennas.\n>>>>>\n>>>>>          \n>>>>>\n>>>>I am definitely going to bed now.   Independent of the transponder\n>>>>RECEIVERS.  That only took 3 times to get right.\n>>>>\n>>>>        \n>>>>\n>>>>>>and Mirek on this.  Mirek's command receiver is nicely done.\n>>>>>>\n>>>>>>Bob\n>>>>>>\n>>>>>>\n>>>>>>\n>>>>>>\n>>>>>>\n>>>>>>            \n>>>>>>\n>>>>>          \n>>>>>\n>>>>-- \n>>>>AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,\n>>>>NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman\n>>>>\"You see, wire telegraph is a kind of a very, very long cat.\n>>>>You pull his tail in New York and his head is meowing in Los\n>>>>Angeles. Do you understand this? And radio operates exactly\n>>>>the same way: you send signals here, they receive them there.\n>>>>The only difference is that there is no cat.\" - Einstein\n>>>>\n>>>>_______________________________________________\n>>>>Via the Eagle mailing list courtesy of AMSAT-NA\n>>>>[email protected]\n>>>>http://amsat.org/mailman/listinfo/eagle\n>>>>        \n>>>>\n>>>_______________________________________________\n>>>Via the Eagle mailing list courtesy of AMSAT-NA\n>>>[email protected]\n>>>http://amsat.org/mailman/listinfo/eagle\n>>><Transponder Architecture - L RX.pdf>\n>>>      \n>>>\n>>_______________________________________________\n>>Via the Eagle mailing list courtesy of AMSAT-NA\n>>[email protected]\n>>http://amsat.org/mailman/listinfo/eagle\n>>    \n>>\n>\n>_______________________________________________\n>Via the Eagle mailing list courtesy of AMSAT-NA\n>[email protected]\n>http://amsat.org/mailman/listinfo/eagle\n>\n>  \n>\n\n\n",
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