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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/R47LSGB62EUHMGVTL56T6YKBHMS6YFQO/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "R47LSGB62EUHMGVTL56T6YKBHMS6YFQO",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/X6UWBE7CCIGQYG46ENCLY7J3VSKCOM5O/?format=api",
    "sender": {
        "address": "cjhurst (a) bigpond.net.au",
        "mailman_id": "4cf6aa7c5aa149e88ce967dd5e9e2913",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4cf6aa7c5aa149e88ce967dd5e9e2913/emails/?format=api"
    },
    "sender_name": "Colin Hurst",
    "subject": "[amsat-bb] Re: ECHO",
    "date": "2006-08-26T05:51:44Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/X6UWBE7CCIGQYG46ENCLY7J3VSKCOM5O/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Patrick,\nMay I take some of your time to educate you on the reception of AO-51.\nFirst I will address your comments.\nThe supposed flea power from my understanding is to ensure the batteries\non board AO-51 remain charged to optimal conditions to achieve longevity.\nThe downlink power is not a mystery as it is embodied in the telemetry.\nIf you are unable to copy the telemetry, all you need to do is politely\nenquire on the amsat-bb. The power levels change rarely, except for special\nevents, tests, whatever.\nI believe AO-51 has been published technically to a high standard.\nThere is a huge amount of information on the Amsat-NA web-site.\nDo own a copy of Gould Smith's excellent publication?\nNow to reception of AO-51.\nPersonally I have been monitoring AO-51 since launch, downloading and\nanalysing telemetry, which is my particular \"focus\".\nThere are many orbits I could also \"shout from the rooftop\" as being very\npoor reception. However over time I have built a profile for reception\nat this QTH. I know those passes that will provide excellent copy and those\nthat leave much to be desired, albeit I operate a fully automated station.\nWhat are some of the influencing factors.\n\nFoliage is a very well documented attenuator of 70cm signals.\nAustralian Eucalypts to my west attest to that.\n\nPolarisation changes occur as AO-51'a attitude varies (below).\nAlthough AO-51 is circularly polarised, there will be occasions that\nVertical\nor Horizontal  polarisation is strongly evident by the observer.\nThis is important to users of dedicated vertical or horizontal antennae.\n\nBecause AO-51's attitude is magnetically stabilised using passive magnets,\nthere will be occasions when the antennae are not earth pointing, hence\nyou may experience shielding of the antennae. Theoretically the northern\nhemisphere is least affected, but there will be occasions when the\nmagnitude\nof the earth's magnetic field may give it an extra kick and degrade\nperformance\nfor that particular orbit. Surprising what you can observe by just\nlistening.\nSignal strength, rate & depth of QSB, signal reports being given by other\nusers.\n\nYou state you have an 8 element yagi with a preamplifier.\nIs the preamp located at the antenna feed point?.\nIf not, it should be for optimal performance.\nThis is the most significant way to improve station performance.\n\nIs the antenna auto tracking in az & el?\nIf so, is it tracking correctly?\nHigh winds moved the rotator on its mount (personal experience).\n\nWhatever your station setup, I strongly recommend that you build up a\nreception performance profile, over a substantive number of passes.\nForget about the TX, just listen with the objective of reception\nimprovement.\nBy recording strength of signal, pass elevation, whether east or west,\nlocal QRM,\nmagnitude of QSB, foliage present etc. you will quickly establish what are\nyour optimal passes, those not optimal.\nI monitor many satellites.\nThey all have strengths, weaknesses and peculiarities relative to my QTH.\nIf we always had \"arm-chair\" copy the fun and challenges would quickly\ndissipate.\nThere is always room for improvement, especially reception performance.\n73.\nColin VK5HI.\n\n\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]]On\n> Behalf Of McGrane\n> Sent: Friday, 25 August 2006 22:57\n> To: Amsat BB\n> Subject: [amsat-bb] ECHO\n>\n>\n>\n> greetings\n>\n> I would like to report very poor reception of echo even with an 8 element\n> yagi and an 18 Db preamp. I assume the downlink power is real flea power\n> for battery charging or other testing.\n>\n> After 2 years of pleading with amsat, the downlink power is still a\n> mystery. It is not shown on the colaradosatellite telemetry graphs (TX B)\n> or the amsat website, after repeated requests here and elsewhere I'll\n> assume it is being held secret for some reason.\n>\n> There has been a tremendous lack of technical reporting on ECHO.\n>\n> I realize people are very busy but time should be taken to educate the\n> amsat community.\n>\n> 73, patrick N2OEQ 32323\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\n> satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}