Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UYGE6XKIPFCHUJYONOY4EQ7FROFK3MSX/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "UYGE6XKIPFCHUJYONOY4EQ7FROFK3MSX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/UYGE6XKIPFCHUJYONOY4EQ7FROFK3MSX/?format=api",
    "sender": {
        "address": "eric.fort (a) gmail.com",
        "mailman_id": "2b2633ba6515405baf7680ea3c20a9ef",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/2b2633ba6515405baf7680ea3c20a9ef/emails/?format=api"
    },
    "sender_name": "Eric Fort",
    "subject": "[amsat-bb] Re: AO-27 (TOPR?) SCHEDULE",
    "date": "2007-09-13T17:47:03Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BXGWSCBTTXARAVNZSZQYPN3CEQJKKFLT/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2YAYFX57TXXUXCEYICEDINELBJYCACD6/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Are there any pieces of software or web tools that will allow the input of\nqth and give pass data for ao-27 that shows transponder on passes only?  I'm\nlooking for a simple way to tell weather or not the pass (or portion\nthereof) is workable.\n\nEric\nKG6KQT\n\nOn 9/13/07, Patrick STODDARD <[email protected]> wrote:\n>\n> Hi Eric!\n>\n> > I just reviewed the pass prodictions for ao-27 on the amsat website.  I\n> then\n> > followed the link to ao27.org.  now I'm a bit confused.  On ao27.orgthere\n> > is listed a TOPR schedule with little explanation of what TOPR is.  It\n> > appears however that this causes the satellite to turn on and off it's\n> > transponder at various times.  If this is the case how does one\n> determine\n> >  usable passes?  A satellite overhead without a functional transponder\n> is\n> > about as useless as mammaries on a bull! It seems it could be a source\n> of\n> > significant frustration if trying to work a pass only to find out the\n> sat\n> > had switched itself off!\n>\n> First of all, AO-27 is an old satellite - about 14 years old.  Its\n> batteries, although\n> functional, aren't what they used to be.  This satellite originally\n> had a non-ham\n> use along with its use as a ham FM cross-band repeater, but now it is\n> pretty much\n> just used by the hams.  To keep from ruining what's left of the\n> batteries, the control\n> operators of that satellite (most of the time, just Michael N3UC) have\n> found a way\n> to keep it functional through this summer despite its age.  Especially\n> when\n> considering that summertime is generally the \"eclipse season\", when\n> the satellite\n> is in darkness for a significant part of each orbit, not able to get\n> its batteries\n> fully charged to support full-time operations.\n>\n> Last year, the satellite was working through the winter into\n> springtime.  In early\n> May 2006, it started to operate intermittently, and then stopped\n> working.  At\n> that time, it was on as an FM repeater for 6 minutes per ascending pass\n> (from\n> South to North) over the Northern Hemisphere along with telemetry\n> transmissions\n> before and after the repeater time plus an additional telemetry\n> transmission on\n> descending passes (passes going from North to South).  It stayed\n> silent until early this\n> year, and - after many weeks of testing and tweaking - and now it has been\n> on\n> for 7 minutes per daytime pass over the Northern Hemisphere.\n>\n> The TOPR (previously TEPR) scheduling determines when the satellite is on\n> and\n> in what configuration - analog repeater or digital telemtry\n> transmission, and the\n> power level.  Most of the time the power level is \"Med\" (around\n> 500mW).  For the\n> past couple of years, the FM repeater would come on after 20 seconds of\n> data\n> and then there would be another minute or so of data after the repeater\n> switches\n> off.  Currently, the repeater switches on for 7 minutes once the\n> satellite reaches\n> approximately 28-29 degrees North latitude on any ascending pass (moving\n> from South to North) where the satellite is in daylight.  The schedule\n> is uploaded\n> to the satellite, but the satellite's onboard clock runs a little fast.\n>\n> Officially, you can see AO-27's schedule for the upcoming 24 hours on this\n> page:\n>\n> http://www.ao27.org/AO27/listing.shtml\n>\n> My observations show that the schedule listed on this page is about 5-6\n> minutes later than the actual times.  There is a program you can download\n> and run on your computer (Java-based) that will do the same thing.  It can\n> be found at:\n>\n> http://www.cs.rit.edu/~cjh9783/programs/satsched.php\n>\n> If you don't have a program to unpack RAR archives, I can e-mail the\n> AO-27 program to you in a ZIP archive.\n>\n> You can tell when the schedule was made from looking on the\n> http://www.ao27.org/ homepage.  Look for the \"TOPR Epoch\" near the\n> middle of the page.  The last time the schedule was updated was in\n> late June, so you can determine the approximate difference between\n> the satellite's onboard clock and the \"real\" time when looking at the\n> schedule.\n>\n> For my location, I have two possible AO-27 passes this afternoon according\n> to the pass-prediction utility on the AMSAT web site: 2137-2152 UTC, and\n> 2317-2331 UTC.  The AO-27 Satellite Schedule program shows that, for those\n> passes, the repeater should be on for 7 minutes starting at 21:42:51 and\n> 23:23:40 UTC (before accounting for the satellite's clock discrepancy -\n> about\n> 40-60 seconds before these times).\n>\n> Is it frustrating that a satellite like this is only available for\n> only portions of\n> some passes?  Sure.  This has been the way AO-27 has operated for\n> many years, and despite those limitations there are usually good crowds\n> working the passes that cover most of North America.  In my satellite log,\n> I\n> have made almost 25% of my 2800+ satellite contacts on AO-27, despite\n> its limitations and the fact it had been off for several months in 2006\n> and\n> into the start of 2007.\n>\n> Good luck and 73!\n>\n>\n>\n> Patrick WD9EWK/VA7EWK - Phoenix AZ\n> http://www.wd9ewk.net/\n>\n",
    "attachments": []
}