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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NDVGYYCTNWKMPXCR4YLIJG6RDPQBSP7S/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAO-vtPN1f4iHyaX1xOYV00KR6bGOU64PTpzdUgUc7+9CUYgr2A@mail.gmail.com",
    "message_id_hash": "NDVGYYCTNWKMPXCR4YLIJG6RDPQBSP7S",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NDVGYYCTNWKMPXCR4YLIJG6RDPQBSP7S/",
    "sender": {
        "address": "kb5wia (a) amsat.org",
        "mailman_id": "a631ac9574fc43afb1d08bf5e7164c19",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/a631ac9574fc43afb1d08bf5e7164c19/emails/"
    },
    "sender_name": "David Palmer KB5WIA",
    "subject": "[amsat-bb]  KB5WIA Update - CM79+",
    "date": "2011-08-05T16:52:59Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Everyone,\n\nHere's an update on the CM79/CM89/CN70/CN80 plans.\n\nCM79 is not an easy grid to work from.  Aside from being physically\nremote, and being a strenuous hike (800' climbing) from the nearest\nroad, the actual topography of the grid is difficult for radio\noperations.  The actual grid corner is in the middle of a thick\nmanzanita and poison-oak forest, 70 feet down the western slope of a\nsteep ridge.  In other words, from anywhere you are in CM79, there's a\nsteep hillside blocking the radio path to the east!  The best location\nis actually the convergence of the four grids at the northeast tip of\nCM79, where it's close enough to the ridge top that a remote antenna\ncan be used to get the signal over the ridge.   The problem then\nbecomes how to have the station itself on the grid convergence (down\nthe hill) and still be able to get signals \"out\".   Following\ndiscussion with (and approval from!) ARRL HQ, here's the plan for\noperation from CM79:\n\n\nStation Setup for Overhead and Westerly satellite passes:\nFull station set up directly over grid square intersection.\nSpecifically, I'll use the standard setup that I have used before,\nconsisting of two Yaesu FT-817ND radios hanging from a photographic\ntripod, with the 6.4Ah LiFeP04 battery right next to the tripod. The\nantenna is an Elk antenna on top of the tripod. The area of the grid\nintersection will be marked with a ground tarp, and will be determined\nwith better than 20' accuracy with WAAS-GPS. Photo and video will be\nused to document the station, GPS receiver, and surroundings.\n\n\nStation Setup for Easterly satellite passes:\nSince the view to the east is blocked by a ridge, 70' uphill, for\neasterly passes I will use the exact same station as above, except\nthat the Elk antenna will be relocated to a second photographic tripod\nperched on the ridge. The Elk will be connected via 100 feet of\nLMR-400 coax, and I will use a preamp at the antenna to help overcome\nthe signal loss on the 70cm downlink. As above, all station operation\nwill be from directly over the grid intersection, including tuning,\ntransceivers, and power source. The Elk can be re-aimed once or twice\nthrough the satellite pass to more or less keep up with the sat as it\nmoves.\n\n\n\nWhat this means:\n\n1)  Lower signals.\nExpect my signal to be weaker than it is during my normal portable\noperations (ie Death Valley, etc).  Since overhead and westerly passes\nwill have tree cover, and the easterly passes will have to use the\n100-foot coax, my uplink signal to the birds won't be as strong as it\nhas been.\n\n2)  Fading on eastern passes.\nAnyone who has operated portable knows a big advantage of handheld\nops, that helps overcome the reduced gain of the smaller antennas, is\nthat you can rotate the antenna to exactly match the current\npolarization of the satellite.  By necessity, I'll lose this advantage\non easterly passes with the remote antenna, since there's no way I can\nbe both at the operating location (to hear the return signals) and the\nantenna (to flip it back and forth).  So, expect my signal to fade in\nand out as the polarity changes.\n\n3)  Time lag to hear sat on my RX end.\nSince I'll be using a 100' run of LMR400 to carry both the uplink AND\ndownlink signals for the eastern passes, this necessarily means that\nthe antenna-mounted preamp is going to switch off during transmit.\nThe SP432VDG takes about 1-2 seconds to come back \"on-line\" after I\nunkey, so on V/U birds if you come back to me immediately I may not\nhear you.  Rapid exchanges on eastern passes probably won't work for\nthis reason, I'll have to take it slow.\n\n4)  I'll be going QRT mid-pass once or twice to re-aim the antenna.\nThe Elk antenna has a fairly wide beamwidth, but certianly not enough\nto cover a whole pass.  On eastern passes, I'll have to leave my\noperating position and hike up to the ridge to point the antenna, then\nwill have to get back down to the operating location.  I won't have to\ndo this on overhead or western passes.\n\n5)  For specific birds:\n\nAO-51 if active:  This one has good strong signals.  Should be OK for\nboth eastern passes with the remote antenna and western passes with\nthe normal configuration.  My 1-2 second time lag on RX might be\nproblematic if the sat is congested.\n\nSO-50:  This one's pretty weak to begin with.  I'll be lucky if I can\nhear anything even with the preamp on the remote antenna, so don't\nexpect too much on eastern passes. Hopefully will be OK on overhead or\nwestern passes.\n\nAO-27:  Probably the same as AO-51.\n\nFO-29:  Normal for overhead and western passes.  For eastern passes,\nmy preamp will cut out during transmit with the remote antenna, so I'm\npretty sure I won't be able to find my uplink.  I'll therefore be\neffectively running half-duplex.  If you hear my call, come back to me\nslowly, so I can use your downlink to zero my tuning.\n\nAO-07:  Normal for overhead and western passes.  I'll likely have a\nvery weak uplink on the eastern passes using the remote antenna to get\nover the hilltop -- input power to the Elk will only be around 2\nwatts.  Listen carefully and have patience.\n\nVO-52:  This one actually works pretty well with the remote antenna\nsetup!  Expect some fading, but this one should be okay.\n\n\nMy website has the most recent information, and you can check the SPOT\ntracker on my QRZ page to see if I'm at the location or not.\n\n\nHope to work many of you on the trip!\n\n73 de Dave KB5WIA\nhttp://kb5wia.blogspot.com\n",
    "attachments": []
}