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GET /hyperkitty/api/list/[email protected]/email/JPWHM6D7YL4KNER5EDOWHEHROLM7JWLC/?format=api
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JPWHM6D7YL4KNER5EDOWHEHROLM7JWLC/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "JPWHM6D7YL4KNER5EDOWHEHROLM7JWLC", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/I6NWXJSKAKOLW7VYR6EBJWNJTC2WIYC2/?format=api", "sender": { "address": "mccardelm (a) gmail.com", "mailman_id": "147f14b8d896456cbff7f12049b091a2", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/147f14b8d896456cbff7f12049b091a2/emails/?format=api" }, "sender_name": "EMike McCardel", "subject": "Re: [amsat-bb] AO-7 CW Telemetry", "date": "2014-07-31T21:03:20Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/I6NWXJSKAKOLW7VYR6EBJWNJTC2WIYC2/?format=api", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "John,\n\nThe December 1974 issue of the AMSAT Newsletter covered AO-7 telemetry fairly in depth. Included was a description on reading the telemetry followed by a telemetry conversion table.\nYou can find the issue in Phil Karn's archive\nhttp://www.ka9q.net/AMSAT-Newsletter-1974.pdf\nThe article begins at about page 100 of the PDF\n\nEMike\n\nEMike McCardel, KC8YLD\nVP for Educational Relations AMSAT-NA\n\nSent from my iPhone\n\n> On Jul 31, 2014, at 2:26 PM, John Papay <[email protected]> wrote:\n> \n> It is very rare to hear clear CW from the AO-7B\n> telemetry beacon around 145.972. Most of the time\n> there is no beacon at all. Sometimes there is\n> jibberish. Usually the signal is very weak.\n> \n> With AO-7 going through eclipse on every orbit, the\n> satellite can come out of eclipse in different modes/\n> options. Recently there have been times where the\n> beacon has transmitted clear CW over North America,\n> something I have not heard over the years.\n> \n> According to the DK3WN website, there was some cw\n> telemetry back in 2002 when the satellite was discovered\n> to be working again. And there was some discussion about\n> what is valid data based on the last 3 digits sent in the\n> 24 group block of data. If the value is 649, 650, or 651,\n> the data is likely valid.\n> \n> I first heard the image of the cw signal around 958. It was\n> so loud I thought it was a valid user at first. But since\n> the cw was all numbers I tuned up to the beacon frequency and\n> there the signal was louder than anything I have ever heard\n> on AO-7. It took a while for me to get the recorder running\n> but I managed to capture some data. After playing it back I\n> found that there was only one block of data where the last\n> group was valid, a 649. Other later transmissions were loud\n> but the data was much different and the last group was not\n> correct.\n> \n> I couldn't locate a telemetry calculator at first so I decided to\n> build one on Excel using the formulae provided by DK3WN. The\n> data follows:\n> \n> AO-7B Telemetry 24July2014 2318UTC\n> POS Parameter Range Raw Real\n> \n> 1A Total Solar Array Current 0-3000ma 171 2094.5ma\n> 1B +X Solar Panel Current 0-2000ma 193 110ma\n> 1C -X Solar Panel Current 0-2000ma 157 830ma\n> 1D +Y Solar Panel Current 0-2000ma 108 1810ma\n> 2A -Y Solar Panel Current 0-2000ma 286 250ma\n> 2B RF Power Out 70/2 0-8watts 204 7.3728W\n> 2C 24 Hour Clock Time 0-1440min 201 15.16min\n> 2D Batt Ch/Discharge Current-2000/+2000 207 -1720ma\n> 3A Batt Voltage 6.5-16.4 361 12.7V\n> 3B Half Batt Voltage 0-10v 397 9.7V\n> 3C Batt Charge Reg #1 0-15v 340 6V\n> 3D Batt Temperature -30 to +50C 300 95.8C\n> 4A Baseplate Temperature -30 to +50C 446 27.72C\n> 4B PA Temperature 2/10 -30 to +50C 401 94.32C\n> 4C +X Face Temperature -30 to +50C 430 51.4C\n> 4D +Z Face Temperature -30 to +50C 498 -49.24C\n> 5A PA Temp 70/2 -30 to +50C 545 29.2C\n> 5B PA Emitter Current 2/10 0-1167ma 502 92.84MA\n> 5C Module Temp 70/2 -30 to +50C 543 32.16C\n> 5D Inst. SW Regulator 0-93ma 527 33.14MA\n> 6A RF Power Out 2/10 0-10,000mw 606 23.076MW\n> 6B RF Power Out 435 0-1000mw 643 219.9MW\n> 6C RF Power Out 2304 0-100mw 679 255.881MW\n> 6D Midrange Telemetry Cal 0-.5v 649 0.49\n> \n> There are some values which are obviously not correct.\n> Some sensors might not be working properly since some\n> values are out of range. However, the solar panel numbers\n> might be somewhat correct. I wouldn't doubt it if the\n> transmitter was putting out 7 watts at the time.\n> \n> Perhaps there are those who are familiar with the AO-7\n> telemetry that can make some sense out of the data.\n> Unfortunately we don't have multiple blocks of good data\n> to compare readings. Maybe some have recorded recent CW\n> data and can find some good blocks that can be shared here.\n> \n> The data was copied on my Arizona remote and Skype was being\n> used to listen. But I am fairly confident that the cw copied\n> is correct.\n> \n> 73,\n> John K8YSE\n> \n> \n> \n> \n> \n> \n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n", "attachments": [] }