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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/U3SBJGTLIBWFWXKNRF4LIBPLOGZ565P7/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "U3SBJGTLIBWFWXKNRF4LIBPLOGZ565P7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/U3SBJGTLIBWFWXKNRF4LIBPLOGZ565P7/",
    "sender": {
        "address": "stanw1le (a) verizon.net",
        "mailman_id": "cde59a7de6874af3b354fb231df89b4c",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/cde59a7de6874af3b354fb231df89b4c/emails/"
    },
    "sender_name": "Stan W1LE",
    "subject": "[amsat-bb]  Frequency Stabilized Local Oscillators",
    "date": "2008-12-10T00:29:39Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello The Net:\n\nSteve Hicks, N5AC, is designing frequency stabilized local oscillators \nthat can be used\nin  the (Down East Microwave Inc.) DEMI  transverters or RX only, block \ndown converters.\nFrequency stability is achieved by locking to a external 10 MHz house \nreference standard\nwhich could be a GPS disciplined oscillator, a OCXO, or a compact Rb \nreference oscillator.\nThe Trimble Thunderbolt GPSDO is a very popular 10 MHz reference.\n\nWe could use your help in disclosing what RFs and IFs you are using for \npresent and proposed satellite\ntransponders. Then we can calculate the local oscillator frequencies \nneeded for the DEMI transverters.\nThis stabilized LO can be used in place of the DEMI standard MICROLO pcb.\nThe MICROLO pcb is used on transverters 900 MHz and higher.\n\nMost will use a \"low beat\" RF/IF mixer scheme, but if you use a \"high \nbeat\" mixer scheme, let us know.\n\nA new design by Steve will allow factory programming for 256 different \nfrequencies, in memory.\nJust change the jumpers for the pre-programmed LO freq you need for your \nsatellite application.\n\nThe objective of this inquiry is to determine what those 256 programmed \nfrequencies should be.\n\nThe DEMI transverter uses 2 pcbs, the MICROLO pcb and the transverter pcb.\nThe transverter pcb multiplies the LO from the MICROLO pcb then mixes it.\nThe transverter pcb LO multiplier on the 2,304 band is X2, for 3,456 MHz \nband is X3,\nfor 5,760 MHz band is X5, for 10,368 MHz band is X9\n\nExamples: (low beat mixer scheme)\n2,401.0 MHz RF,  RX only, block down converter with a 145.0 MHz IF \noutput, low beat,\n2,401.0 - 145.0 = 2,256.0 MHz, divided by 2 = 1128.0 MHz\n2,400.0 - 432.0 = 1,968 MHz, divided by 2 = 984.0 MHz\n2400.0 - 50.0  = 2,350.0 MHz, divided by 2 = 1,175.0 MHz\n2439.0 - 144 = 2,239.0 MHz, divided by 2 = 1,147.5 MHz\n\n3,400.0 MHz RF downlink with a 144 MHz IF: 3400.0 - 144.0 = 3256.0 MHz, \ndivided by 3 = 10.85.333 MHz\n3,400.0 - 432.0 = 2,968.0 MHz, divided by 3 = 989.333 MHz\n\n5,668.0 MHx RF uplink with a 144 MHz IF:  5668 - 144 = 5,524 MHz\n\n10,451.0 MHz RF downlink with a 144 MHz IF, LO =\n10,451.0 - 144.0 = 10,307.0 MHz, divided by 9 = 1145.222 MHz\nfor a 432 MHz IF, 10,451.0 - 432.0 = 10,019.0 MHz, divided by 9 = \n1,113.222 MHz\n\n10,386.0 MHz RF for terrestrial ops, 145.0 MHz IF,\n10,368 - 145 = 10,223 MHz, divide by 9 = 1,135.888 MHz\n10,368.0 MHz RF with 144.0 MHz IF, 10,368 - 144 = 10,224 MHz, divided by \n9 = 1,136.0 MHz\n\nLook to:      http://www.n5ac.com/blog/?page_id=19          for the N5AC \nproducts\nLook to:      http://www.downeastmicrowave.com/A32.htm       for more \ndetails on the synthesized LO pcb\n\nI will summarized your RF/IF combinations.\n(Hopefully there are not too many typos here)  \n\nStan, W1LE    FN41sr    Cape Cod\n\n\n\n\n",
    "attachments": []
}