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GET /hyperkitty/api/list/[email protected]/email/IKZ3D3MDQ6BJFVVWYVHJOPHRMP7KWDY2/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IKZ3D3MDQ6BJFVVWYVHJOPHRMP7KWDY2/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "IKZ3D3MDQ6BJFVVWYVHJOPHRMP7KWDY2", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IKZ3D3MDQ6BJFVVWYVHJOPHRMP7KWDY2/", "sender": { "address": "sasb.geo (a) yahoo.com", "mailman_id": "5f642a3374b247de860611fd890a9d35", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/5f642a3374b247de860611fd890a9d35/emails/" }, "sender_name": "Eduardo Erlemann", "subject": "Re: [amsat-bb] AO-7 transponder pan view", "date": "2015-11-25T15:34:02Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "It is a SNR (signal to noise ratio) matter, if you position your TX on the top of the hill you can hear it stronger but the noise is also stronger, if you slip to the mid of the valley your signal will be weaker but noise as well. In a practical experiment (using my ears) I noticed a better SNR relationship staying in between the valley and the hill, which will be very difficult to find for who uses a regular rig for RX.\n\n73 Ed PY2RN\nGG66LW\n--------------------------------------------\nOn Wed, 11/25/15, Joe <[email protected]> wrote:\n\n Subject: Re: [amsat-bb] AO-7 transponder pan view\n To: \"Eduardo Erlemann\" <[email protected]>, [email protected]\n Date: Wednesday, November 25, 2015, 1:25 PM\n \n \n So,\n \n For best results you want to place your signal in the\n valleys true?\n \n \n \n Joe WB9SBD\n \n \n Sig\n \n The\n Original Rolling\n Ball Clock\n \n Idle\n Tyme\n \n Idle-Tyme.com\n \n http://www.idle-tyme.com\n \n \n On 11/25/2015 8:52 AM,\n Eduardo Erlemann\n wrote:\n \n \n \n I think it is caused due the components\n age/conditions which is affecting its receiver linearity,\n noticed even in a such narrow band.\n \n 73s\n \n Ed PY2RN\n GG66LW\n --------------------------------------------\n On Wed, 11/25/15, Joe <[email protected]>\n wrote:\n \n Subject: Re: [amsat-bb] AO-7 transponder pan view\n To: [email protected]\n Date: Wednesday, November 25, 2015, 12:08 PM\n \n Thats pretty cool.\n Is it a part of the filtering in this old gal,\n or what causes it?\n \n Joe\n WB9SBD\n Sig\n The Original\n Rolling Ball Clock\n Idle Tyme\n Idle-Tyme.com\n http://www.idle-tyme.com\n On 11/25/2015 3:21 AM, Daniel Estévez\n wrote:\n > El 24/11/15 a las 23:20, Joe\n escribió:\n >> what are the three hills\n about?\n > That's just noise from the\n passband of AO-7 transponder. It's stronger\n > in three spots, one on the middle of the\n passband and two near the\n > edges. These\n spots are quite strong, in fact comparable to some of the\n > stations. If you look closely, you can\n also see that these spots get\n > frequency\n modulated with the strong transmissions.\n >\n > This is one of those\n things that it's quite difficult to see on a\n > traditional receiver but it's quite\n apparent on an SDR waterfall.\n >\n > 73,\n >\n > Dani M0HXM/EA4GPZ.\n >\n >\n _______________________________________________\n > Sent via [email protected].\n AMSAT-NA makes this open forum available\n > to all interested persons worldwide\n without requiring membership. Opinions expressed\n > are solely those of the author, and do not\n reflect the official views of AMSAT-NA.\n >\n Not an AMSAT-NA member? Join now to support the amateur\n satellite program!\n > Subscription\n settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n >\n >\n >\n \n _______________________________________________\n Sent via [email protected].\n AMSAT-NA makes this open forum available\n to\n all interested persons worldwide without requiring\n membership. Opinions expressed\n are solely\n those of the author, and do not reflect the official views\n of AMSAT-NA.\n Not an AMSAT-NA member? Join\n now to support the amateur satellite program!\n Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n \n \n \n \n \n \n \n \n", "attachments": [] }