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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WXYKFVTAKXJLXBCAQMMKWHFOQ66YYKXX/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "WXYKFVTAKXJLXBCAQMMKWHFOQ66YYKXX", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GQN66W4DHOQJYEXDIZCCLWG3525EQ6AV/", "sender": { "address": "rwmcgwier (a) comcast.net", "mailman_id": null, "emails": null }, "sender_name": "Robert McGwier", "subject": "[eagle] Re: Where we're heading for bands and services", "date": "2006-09-25T12:41:51Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SCKNWTPEXSFESMY4IBFJRIQWWYY7TG3I/", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OBU6CF5IQUIVV32HHITBXDIWGZ3MGLJV/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Lyle Johnson wrote:\n> Robert McGwier wrote:\n>> Thank you Jim.\n>>\n>\n> ACP?\nAdvanced Communications Package (to be read: Hambly Marketing Firm, \nInc. does not want us calling it Digital).\n>\n>> On L band we need the SDX pick off, the ACP pick off, and the \n>> command receiver pick off using a single antenna and any LNA.\n>\n> By \"the command receiver\" do you mean a fixed frequency demodulator \n> output for the IHU3?\nYes. A fixed frequency separate input not in the passband. I can hear \nJames Miller in my head : \"We shan't have the punters confiscating the \ncommand channel\".\n>\n>\n> I discussed some of these ideas with Eric, N7CL, at the TAPR meeting. \n> Eric is very good at antenna system design, did S band stuff for us at \n> MMS and does this sort of thing now for DoD.\n>\n> Anyway, he suggested we consider Vivaldi's rather than patches. We \n> used Vivaldi's on our trucks at S Band and they work well, are trivial \n> to fabricate (a piece of PC board - I know, radiation, but it is the \n> concept I am wanting us to consider). They are well behaved and have \n> very little coupling to adjacent antennas. I'm not an antenna guy, \n> but you might want to consider the Vivaldi and/or communicate with Eric.\nI don't know what a Vivaldi is but I will find out.\n>\n> Lyle\n>\n>>\n>> Bob\n>> N4HY\n>>\n>>\n\n\n-- \nAMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,\nNJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman\n\"You see, wire telegraph is a kind of a very, very long cat.\nYou pull his tail in New York and his head is meowing in Los\nAngeles. Do you understand this? And radio operates exactly\nthe same way: you send signals here, they receive them there.\nThe only difference is that there is no cat.\" - Einstein\n\n", "attachments": [] }