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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NYRZ3ATQKP7B5LTPJGSULJOYH3TFN2M6/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "NYRZ3ATQKP7B5LTPJGSULJOYH3TFN2M6",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HGP5T6QCUVJZFAS2MKB7UR4XMT22GX7Q/",
    "sender": {
        "address": "rwmcgwier (a) comcast.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Robert McGwier",
    "subject": "[eagle] Re: 2 Meter amplifier",
    "date": "2006-08-19T01:00:50Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZWTFHWT4SOEZEHCWHEK4QWZMHE6ACZVR/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I am hoping that CREE makes a 50w output device and we build one \namplifier to make the thing so we can run at 50w PEP and smaller ones \nfor the N amplifier/antenna version.  I am wondering about the \nSDX/HELAPS on the multiple amplifier version.  It will be easier for \nDick to cool but harder for our HELAPS so that is the note of caution I \nsound.  I like everything about it except contemplating that.  Our \nHELAPS will be sensor based and heavily dependent on predistortion to \nachieve the best performance.  We might be pushing the SDX/HPSDR \nSasquatch to the limit controlling three amplifiers.  If we really are \ngoing to try to get total DC efficiency well over 50% for the \ntransponder and get good IMD,  we will need the polyphase DSP HELAPS to \nwork.\n\nThese E/I curves are looking really good if the simulation approaches \nreality.   I would like comments ASAP for Marc.\n\nWe are getting well down the road on the HPSDR developments.  When Lyle \ngets back from Oz,   that project should take a leap forward.  A bunch \nof our SDX hardware will be from that project (in prototype form).\n\nBob\n\n\n\nDick Jansson-rr wrote:\n> Tom has an intesting suggestion of the 3x amplifiers/antennas. I have\n> been suggesting this antenna configuration as I just take the P3C\n> hardware and use it! Please help my poor brain understand how this gets\n> the desired RHCP? Is is just the three rotationally oriented antennas?\n>\n> Dick Jansson\n> ---------------------------\n> [email protected]\n> ---------------------------\n>\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On Behalf\n> Of Tom Clark, K3IO\n> Sent: Friday, 18 August, 2006 2253\n> To: Robert McGwier\n> Cc: 'EAGLE'\n> Subject: [eagle] Re: 2 Meter amplifier\n>\n>\n> Robert McGwier wrote:\n>   \n>> Apologies.   I know CREE is a leading company in GaN and I leaped \n>> without being careful.  This is SiC technology.\n>>\n>> Bob\n>>\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": []
}