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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RAOMHLZ2UH36MGSGO4XYKIWKD3J65CNY/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "RAOMHLZ2UH36MGSGO4XYKIWKD3J65CNY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RAOMHLZ2UH36MGSGO4XYKIWKD3J65CNY/?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 Downconverter mounted on Tower",
    "date": "2011-12-03T01:49:41Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The suggestion to mount the converter on the tower\nnear the antenna might have some good results, however,\nthere are two problems.  The first is that you will need\ntwo coax relays or a transfer switch up on the tower to\nswitch the converter in and out of the circuit.  Then you\nhave the potential to transmit into the converter when you\nare uplinking on uhf if you forget to switch the relay.  When\nyou mount the converter in the shack, you can use an inexpensive\ncoax switch.\n\nYou could use a single relay with two feedlines.  One would\nbe for the converter output which goes to the rx aux ant jack.\nThat line could be lossy since the converter has some gain\nand the 10 meter output will be attenuated less than at UHF.\nThe other would be your best coax and would connect to the\ntype N port on the TS2000.  This would prevent any possibility\nof transmitting into the converter.  In other words, the\nantenna would be switched to the converter input or directly to\nthe TS2000 Type N connector.\n\nThe second problem is that when you have electronics with\nfrequency determining elements (crystal oscillators) mounted\noutside, temperature variations will cause drift.  Having\nthe converter inside stabilizes the temperature and the\nconverter doesn't drift.  Mounting electronics outside\nalso requires special attention to keeping things dry. It's\njust a lot easier to keep things inside and use good quality\ncoax.  Heliax is often available at prices not much greater than\nLMR400 etc.  If sealed up, it will last a lifetime.\n\n73,\nJohn K8YSE\n\n   \n\n",
    "attachments": []
}