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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WFE2BMJJ5P2TMD7QHCA765BPW5IPCHGC/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "000201c85f71$26b68c60$20a4fed8@clare", "message_id_hash": "WFE2BMJJ5P2TMD7QHCA765BPW5IPCHGC", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/Y2KDIP3MYHB77HCDQHZ3K357DJRI2L3G/?format=api", "sender": { "address": "lcfowler (a) magma.ca", "mailman_id": null, "emails": null }, "sender_name": "Clare Fowler", "subject": "[amsat-bb] Re: AO-16 report", "date": "2008-01-25T16:41:35Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Y2KDIP3MYHB77HCDQHZ3K357DJRI2L3G/?format=api", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Some more observations.\nClare VE3NPC\n\n----- Original Message ----- \nFrom: \"OZ1MY\" <[email protected]>\n\n> I do not know about other areas of the World - but here\n> over Europe the background noise on the downlink is very high.\n> Did not experience the normal FM quieting effect by increasing the\n> uplink power. I do not understand that - any ideas ?\n> Is AO-16 making the noise itself ??\n\nYes the noise is coming from AO-16 and is readily observed on\nmy home brew spectrum display unit.\nIts amplitude (QSB) varies at a cyclical rate of about 14 seconds \nwhich corresponds to a spin rate of close to 4 rpm.\nThe peak to min on my FT-847 can be up to 6 S units depending\non elevation distance and angle with the maximum difference \noccurring at higher elevations. \n>\n\n> The polarity of the downlink antenna is difficult to make out.\n> I thought it is RHCP - but Mark says LHCP.\n> For me on the passes to the East RHCP is best !\n> Passes from the South - LHCP is best !\n> That is a general observation - some times it helped to switch\n> during the passes.\n> AO-16 might be tumbling a lot ?\n\nMy observations agree with this as the sat approaches and \nrecedes. However during the middle of a high elevation pass \nwhen one polarity is at a minimum the opposite polarity is at a \nmaximum. I have 2 x 10 turn helix ants on RH and a single\n10 turn helix on LH with coax relay switching. \n\n>\n> Have fun and thanks to the team and the builders.\n>\n> 73 OZ1MY\n> Ib\n>\n\nVE3NPC\nClare\n", "attachments": [] }