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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/I6NWXJSKAKOLW7VYR6EBJWNJTC2WIYC2/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "I6NWXJSKAKOLW7VYR6EBJWNJTC2WIYC2",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/I6NWXJSKAKOLW7VYR6EBJWNJTC2WIYC2/?format=api",
    "sender": {
        "address": "john (a) papays.com",
        "mailman_id": "40c82fe75f644d01882ed3a91ae267dd",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/40c82fe75f644d01882ed3a91ae267dd/emails/?format=api"
    },
    "sender_name": "John Papay",
    "subject": "[amsat-bb] AO-7 CW Telemetry",
    "date": "2014-07-31T18:26:34Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JPWHM6D7YL4KNER5EDOWHEHROLM7JWLC/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "It is very rare to hear clear CW from the AO-7B\ntelemetry beacon around 145.972.  Most of the time\nthere is no beacon at all.  Sometimes there is\njibberish.  Usually the signal is very weak.\n\nWith AO-7 going through eclipse on every orbit, the\nsatellite can come out of eclipse in different modes/\noptions.  Recently there have been times where the\nbeacon has transmitted clear CW over North America,\nsomething I have not heard over the years.\n\nAccording to the DK3WN website, there was some cw\ntelemetry back in 2002 when the satellite was discovered\nto be working again.  And there was some discussion about\nwhat is valid data based on the last 3 digits sent in the\n24 group block of data.  If the value is 649, 650, or 651,\nthe data is likely valid.\n\nI first heard the image of the cw signal around 958.  It was\nso loud I thought it was a valid user at first.  But since\nthe cw was all numbers I tuned up to the beacon frequency and\nthere the signal was louder than anything I have ever heard\non AO-7.  It took a while for me to get the recorder running\nbut I managed to capture some data.  After playing it back I\nfound that there was only one block of data where the last\ngroup was valid, a 649.  Other later transmissions were loud\nbut the data was much different and the last group was not\ncorrect.\n\nI couldn't locate a telemetry calculator at first so I decided to\nbuild one on Excel using the formulae provided by DK3WN.  The\ndata follows:\n\nAO-7B Telemetry 24July2014   2318UTC\nPOS  Parameter                Range     Raw  Real\n\n1A Total Solar Array Current  0-3000ma  171 2094.5ma\n1B +X Solar Panel Current     0-2000ma  193  110ma\n1C -X Solar Panel Current     0-2000ma  157  830ma\n1D +Y Solar Panel Current     0-2000ma  108  1810ma\n2A -Y Solar Panel Current     0-2000ma  286  250ma\n2B RF Power Out 70/2          0-8watts  204 7.3728W\n2C 24 Hour Clock Time         0-1440min 201 15.16min\n2D Batt Ch/Discharge Current-2000/+2000 207  -1720ma\n3A Batt Voltage               6.5-16.4  361  12.7V\n3B Half Batt Voltage          0-10v     397   9.7V\n3C Batt Charge Reg #1         0-15v     340   6V\n3D Batt Temperature         -30 to +50C 300   95.8C\n4A Baseplate Temperature    -30 to +50C 446   27.72C\n4B PA Temperature 2/10      -30 to +50C 401   94.32C\n4C +X Face Temperature      -30 to +50C 430   51.4C\n4D +Z Face Temperature      -30 to +50C 498  -49.24C\n5A PA Temp 70/2             -30 to +50C 545   29.2C\n5B PA Emitter Current 2/10    0-1167ma  502   92.84MA\n5C Module Temp 70/2         -30 to +50C 543   32.16C\n5D Inst. SW Regulator         0-93ma    527   33.14MA\n6A RF Power Out 2/10         0-10,000mw 606   23.076MW\n6B RF Power Out 435           0-1000mw  643   219.9MW\n6C RF Power Out 2304          0-100mw   679   255.881MW\n6D Midrange Telemetry Cal     0-.5v     649   0.49\n\nThere are some values which are obviously not correct.\nSome sensors might not be working properly since some\nvalues are out of range.  However, the solar panel numbers\nmight be somewhat correct.  I wouldn't doubt it if the\ntransmitter was putting out 7 watts at the time.\n\nPerhaps there are those who are familiar with the AO-7\ntelemetry that can make some sense out of the data.\nUnfortunately we don't have multiple blocks of good data\nto compare readings.  Maybe some have recorded recent CW\ndata and can find some good blocks that can be shared here.\n\nThe data was copied on my Arizona remote and Skype was being\nused to listen.  But I am fairly confident that the cw copied\nis correct.\n\n73,\nJohn K8YSE\n\n\n\n\n\n\n",
    "attachments": []
}