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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4ACRE2N2YLX6KAJXRAIZN5UE6UMW45UT/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "4ACRE2N2YLX6KAJXRAIZN5UE6UMW45UT", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4ACRE2N2YLX6KAJXRAIZN5UE6UMW45UT/", "sender": { "address": "RaySoifer (a) cs.com", "mailman_id": null, "emails": null }, "sender_name": "[email protected]", "subject": "[eagle] Re: [Advisors] [Fwd: Re: S band and Eagle: an appeal for\tahigher ...", "date": "2006-09-19T15:11:55Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "In a message dated 9/19/06 5:46:16 AM Greenwich Standard Time, \[email protected] writes: \n> When we are considering L/S and U/S, we should remember the advantages of \n> U/V and V/U. The original choice of U/V for phase 3 satellites allowed for an \n> antenna that would provide 75% orbit coverage. Path loss for L and S is much \n> higher so AO13 and AO-40 had much narrower beams and covered less of the \n> orbit in those modes. So, in addition to the fact that S will be unavailable in \n> many areas due to noise levels that are 20+ dB higher today, the time \n> available in those areas for this mode is much less than for U/V or V/U. The attached \n> document provides a graphical comparison of U and L uplink antenna coverage \n> for the same ground station radiated power level. The V and S downlinks are \n> very similar.\n> \n> \n\nYes, and we should remember also that uplink QRM levels on 2 meters due to \nillegal high-power cordless phones and the like are much greater than in the \npast, as OZ1MY has documented. That is why the Surrey Colloquium recommended, a \ncouple of years ago, that U/V be used in preference to V/U. With U/V, the QRM \naffects only users in immediate proximity to the interference source, not the \nentire footprint as is the case with uplinks.\n\n73,\n\nRay \n\n\n", "attachments": [ { "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4ACRE2N2YLX6KAJXRAIZN5UE6UMW45UT/", "counter": 2, "name": "attachment.html", "content_type": "text/html", "encoding": "us-ascii", "size": 1826, "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/4ACRE2N2YLX6KAJXRAIZN5UE6UMW45UT/attachment/2/attachment.html" } ] }