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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VX573RUUN42LPG5ILIC45SH2D4CB7X7Y/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "828444405.596638.1385427965222.JavaMail.root@sz0209a.emeryville.ca.mail.comcast.net",
    "message_id_hash": "VX573RUUN42LPG5ILIC45SH2D4CB7X7Y",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/K6QD2ABCPRIRGXOG3IEEKSUK3N3LPAJO/?format=api",
    "sender": {
        "address": "w7lrd (a) comcast.net",
        "mailman_id": "717aa2a241704c7497e9abd8c983f6b7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/717aa2a241704c7497e9abd8c983f6b7/emails/?format=api"
    },
    "sender_name": "Bob- W7LRD",
    "subject": "[amsat-bb] Re: AO-73 sometimes hard to access",
    "date": "2013-11-26T01:06:05Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BEMAA66AQJGVPUHRPTM3BPLZOBRKQMO5/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Andy et al...I look at it like each of the satellites we use have their own \"personalities\", AO-73 being new we must learn it's idiosyncrasies. When AO-7 was \"reborn\" we had to understand and learn how the grand old lady functioned. Now it's \"fairly\" easy (most of the time). It seems there is always a learning curve in front of me. If there weren't one provided I'd probably create one. Nice to hear the usual culprits on AO-73. \n73 Bob W7LRD \n\n----- Original Message -----\nFrom: \"Andy Kellner\" <[email protected]> \nTo: [email protected] \nSent: Monday, November 25, 2013 4:46:55 PM \nSubject: [amsat-bb] Re: AO-73 sometimes hard to access \n\nJames, \n\nnow, not at all. Nobody is gonna dismiss your problems / concerns. For the people who work SSB satellites, they know that it can be a tricky business to get it right. And if you add to this a more-or-less un-proofen, new satellite it can make it even more tricky. \n\nNow to my observations to last nights 55 degree pass over VK4 (orbit #62, sat eclipsed): \n\n- Linear Transponder was there. I needed to start with an uplink frequency 4.2 kHz. higher than specified. This offset kept increasing thru out the pass to about 5 kHz. at the end of the pass (thats in addition to the doppler correction). \n- Made a brief contact with a VK3 station which had similar problems finding/keeping its signal. \n- Once the downlink has been received, the signal was strong at times, however I noticed significant variations in signal strength on the downlink. \n- I observed the same variations on the telemetry transponder. The signal is nice and strong and easily decodable in one frame and barely audible the next. Almost if the sat switches back and forth between high power / low power ? Other explanation could be the satellite rotating. This effect is certainly there from larger birds such as AO7, but I am not sure if any rotation would make any difference from a tiny cubesat ? \n\n\nEquipment: Full duplex Yaesu 847, doppler corrected with CAT/SatPC32 and automatic tracking antennas (Nova), mast mount pre-amps etc. 2013-066B keps used. \n\nAndreas - VK4TH \n\n\n\n________________________________ \nFrom: James Luhn <[email protected]> \nTo: [email protected] \nSent: Tuesday, 26 November 2013 8:55 AM \nSubject: [amsat-bb] AO-73 sometimes hard to access \n\n\nI have had the same experience as Perry with AO-73 with regards to \nsignal problems. I have an IC-910 transceiver and a M2 2mcp14 (2 \nmeters) and M2 436CP30 antenna with a Yaesu G-5500. I have the IC-910 \nset to about 25 watts on UHF. I have made one contact on AO-73. It has \ntaken me forever to get the doppler correct as I usually cannot hear my \nsignal. Last night my returning signal was extremely strong for about \n1 minute. In comparison, the received signal from FO-29 is extremely \nstrong so I am assuming that my UHF antenna is working fine. Like \nPerry, I have never experienced this before. At times AO-73 takes some \nvery deep fades (telemetry). With such a small little cube, I would not \nthink the satellite is blocking the antenna (although 4 inches is \nstarting to get close to 435 wavelength. The frequency offset confused \nme at first. I just kept cranking up the frequency and there I was but \nvery, very weak. I'm not gripping as I am having a blast. Those of you \nwith experience are probably getting a laugh at what I report. I am a \nnewbie to this satellite stuff and learning as I go and extremely \nexcited to make even one contact. Maybe the geese overhead are causing \nme some problems. :-) \n\n73, \n-james \nW5AOO \n...a ham for 50+ years and enjoying every minute of it! \n_______________________________________________ \nSent via [email protected]. Opinions expressed are those of the author. \nNot an AMSAT-NA member? Join now to support the amateur satellite program! \nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n_______________________________________________ \nSent via [email protected]. Opinions expressed are those of the author. \nNot an AMSAT-NA member? Join now to support the amateur satellite program! \nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n",
    "attachments": []
}