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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Z72NV2J3ZV5R5U5ABDTCJG2H626IHVC4/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "Z72NV2J3ZV5R5U5ABDTCJG2H626IHVC4",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/Z72NV2J3ZV5R5U5ABDTCJG2H626IHVC4/",
    "sender": {
        "address": "andreas (a) imse.de",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Andreas Imse",
    "subject": "[amsat-bb]  Re: International Space Station-Bounce on 1296 MHz",
    "date": "2013-05-30T08:05:05Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Domenico,\n\n \n\nyour plan is really interesting, but I cannot support you with exact data at\npresent.\n\nMaybe the wav file recorded by my SDR can give you an impression of the QSO:\nhttps://docs.google.com/file/d/0B8ak4za2va9ZVld5ZXZaREE5bXc/edit?usp=sharing\n\n \n\nI did not receive own echoes off the ISS, just the ones of PA3FXB, who was\nusing a 3 m dish as well and 375 W at feed. We used plain CW and I heard Jan\non my speaker with 2700 Hz Bandwidth.\n\nAs it was the very first shot, just to complete a QSO, no semi scientific\nrecords were made, hi. There were too many other things to mention about.\n\n \n\nBut it is a good idea to record all data as current elevation, azimuth,\nslant range, relative speed and doppler to a file. Since I do the complete\nstation control including CW transmission by a homebrew program,\n\nit is just a small piece of work to do, to realize that. These data could\neasily be synchronized with a wav file, like the one linked above, by using\nthe switching  between RX and TX.\n\n \n\nJan and I plan further tests, when ISS will appear again at more moderate\ntimes ;-)\n\n \n\nWe are thinking about FSK441 tests too, but not at present.\n\n \n\n \n\nvy 73,\n\nAndreas\n\n \n\n \n\nAndreas Imse\n\nDJ5AR / EI8HH\n\nHinter der Kirche 31\n\n55129 Mainz\n\nGermany\n\n \n\n+49 6136 959025\n\[email protected]\n\nwww.dj5ar.de\n\n \n\n \n\n \n\n \n\nVon: i8cvs [mailto:[email protected]] \nGesendet: Donnerstag, 30. Mai 2013 01:13\nAn: Andreas Imse\nBetreff: Re: [amsat-bb] Re: International Space Station-Bounce on 1296 MHz\nWichtigkeit: Hoch\n\n \n\nHi Andreas, DJ5AR\n\n \n\nUsing the RADAR equation I would like to perform a link calculation of your\nQSO with Jan PA3FXB through the International Space Station-Bounce on 1296\nMHz\n\n \n\nI already know that the gain of your 3 meter dish is 29 dB and your power at\nthe feed point is 200 W but I need the additional estimated following\ninformations:\n\n \n\n1) The range and the elevation from the ISS and your QTH as soon you started\nreceiving your own ECHO'es  \n\n     signals.\n\n \n\n2) The maximum range and the elevation from the ISS and your QTH when your\nreceived signals were the \n\n     strongest possible. \n\n \n\n3) Were you receiving in analogic CW using 500 Hz filter and headphone or\nwere you using digital WSJT software \n\n     such as FSK441 or others software (commonly used for rapidly moving\nmeteor scatter QSO's). ? \n\n \n\nWhen the ISS is at the AOS with elevation of 2 degrees the range is about\n2000 km and when the elevation is about 35 degrees the range is about 700 km\nso that I plan to calculate the budged link for both distances 2000 km and\n700 km and see what the results are in Signal to Noise ratio using only a\nanalogic CW receiver and than calculate the advantages using a digital\nsystem.\n\n \n\nThanks for your answere.\n \n\n73\" de \n\n \n\ni8CVS Domenico\n\n----- Original Message ----- \n\nFrom: Andreas Imse <mailto:[email protected]>  \n\nTo: [email protected] \n\nSent: Tuesday, May 28, 2013 9:23 AM\n\nSubject: [amsat-bb] Re: International Space Station-Bounce on 1296 MHz\n\n \n\nHi Domenico,\n\n \n\nI saw your posting and will give you a short reply.\n\n \n\nWe are both using 3 m dishes, 200 W here and 375 W on Jan´s side.\n\nThat was far enough for our tests. \n\nAs our QTHs are quite close (only 367 km), it is possible that QSOs over a\nlarger distances might be possible with less power like in aircraft scatter.\n\n\nIf you are equipped for 1296 MHz and able to track the ISS with your\nantenna, we should have a try.\n\nDoppler compensation can be done completely on my side.\n\n \n\nBy the way: I have been visiting Naples and Stromboli 3 years ago and\nremember passing Torre del Greco with the Circum Vesuviana.\n\n \n\nvy 73,\n\nAndreas\n\n \n\n \n\nAndreas Imse\n\nDJ5AR / EI8HH\n\nHinter der Kirche 31\n\n55129 Mainz\n\nGermany\n\n \n\n+49 6136 959025\n\[email protected]\n\nwww.dj5ar.de\n\n \n\n \n\n",
    "attachments": []
}