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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LFVTCVHQKHGTG76CMC64BAMU6FK5QJFJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "LFVTCVHQKHGTG76CMC64BAMU6FK5QJFJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LFVTCVHQKHGTG76CMC64BAMU6FK5QJFJ/?format=api",
    "sender": {
        "address": "john (a) papays.com",
        "mailman_id": "40c82fe75f644d01882ed3a91ae267dd",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/40c82fe75f644d01882ed3a91ae267dd/emails/?format=api"
    },
    "sender_name": "John Papay",
    "subject": "[amsat-bb] TS2000 ~436.798 MHz Birdie Solution",
    "date": "2011-11-30T15:49:39Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SN3YTY7OSLMJY22M6Q4LEQWSJORRZQGZ/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BXDIS6JN4UFEV5TEHEJKNXCMHLS4WORZ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "As many of you know, my satellite radio is a TS2000X.\nIf you have visited my satellite webpage, you have seen\nmany recordings of AO-27 and SO50 from AOS to LOS.  Most\nof these recordings were made when I was not sitting in\nfront of the radio.\n\nAt first I used a uhf mobile to hear AO-27 and SO-50.  The\nproblem was that those radios were not computer controlled\nso you had to tune for the doppler.  That worked fine when\nI was in the shack, but it didn't work when I was away.  The\nobvious solution was another radio that didn't have the birdie\nproblem, or a simple UHF to 10M downconverter which wouldn't\nhave the birdie problem.  Back in the day, UHF and VHF down-\nconverters were very popular because we didn't have a lot of\nDC to Light radios out there.  Now these converters are sitting\nin junk boxes and are long forgotten by their owners.\n\nOne of the more popular manufacturers of these inexpensive\ndownconverters was Hamtronics.  They made all kinds of stuff\nfor repeaters etc.  At first their products were not that great,\nbut they evolved into some better designs including their\nUHF to 10m downconverters.  Unfortunately most downconverter\nmanufacturers stopped making them when the devices they were using\nbecame obsolete and unavailable.  The use of current production\ndevices required a redesign of their PC boards and since the demand\nwas no longer there, these products were abandoned.\n\nI was fortunate to find a Hamtronics converter on a qrz.com posting\nfrom several years back.  It never sold back then and the owner still\nhad it.  I purchased it and ran some tests on it against the receiver\nin the TS2000.  It turned out that the downconverter had a slightly\nbetter sensitivity than the TS2000!\n\nThe big concern when using a converter or preamp is the fear of\ntransmitting into it and smoking the front end.  But the TS2000\nhas an auxiliary antenna jack which is receive only and perfect for\na downconverter output on HF.  As Drew mentioned, SatPC32 can\ncompensate for a downconverter and tune the TS2000 for doppler\nin the 10m band.  This allowed me to track AO-27 AO-51 and SO-50\nunattended and make all those recordings without any human\nintervention.\n\nA coaxial transfer relay was inserted into the uhf antenna line so\nthat when the converter was in use, the UHF antenna was switched\nto the downconverter input (which outputs to the aux antenna jack\non the TS2000) and the UHF antenna jack on the TS2000 is switched\nto a dummy load.  So if you transmit on UHF, power goes into the\ndummy load and all equipment is safe.  When I want to transmit on\nUHF (VO-52 and AO-7 mode B), the coax relay switches the UHF antenna\nback to the UHF antenna port on the TS2000.  The downconverter is out\nof the antenna circuit at this point.  I did not use the downconverter\nwhen operating on FO-29 so the aux antenna jack had to be switched to\nnormal in the tS2000, menu #18 (FO-29 is a linear bird that outputs on\nUHF, currently not working).\n\nEvery owner of a TS2000 that operates satellites needs a UHF to 10M\ndownconverter.  Hamtronics is making a VHF to 10M downconverter now.\nIf everyone emailed them to encourage them to make a UHF model, they\nmight just do it.  The only other solution is to make one yourself,\nor find a used downconverter or transverter that is gathering dust on\nsomeone's shelf.  I now have an IC910H and am doing comparisons against\nthe TS2000.  My first impression it that I prefer the TS2000 but that\nmight be because I'm so familiar with it.  I use another TS2000 in the\nmobile sat truck but don't have a downconverter for it.  I simply use\na uhf mobile for receive on AO-27 and SO-50 since I'm in front of the\nradio and don't run it unattended.  I have a coax switch to switch\nthe UHF antenna from the TS2000 to the UHF mobile.\n\nNow that AO-51 is silent, all of the FM operation is on SO-50 and AO-27.\nIf you have a TS2000, you'll want to investigate the use of a downconverter.\n\n73,\nJohn K8YSE\n\n\n",
    "attachments": []
}