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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LCEUG6F2I2AXGFFP4OCNG6KOF3KSCU43/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "LCEUG6F2I2AXGFFP4OCNG6KOF3KSCU43",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7AEPBTLLLKXPJ4BJP75HIUAQKZEN5IOO/",
    "sender": {
        "address": "kq6ea (a) verizon.net",
        "mailman_id": "d2ef86d749ee450c8ad9ffc9f2e15cad",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d2ef86d749ee450c8ad9ffc9f2e15cad/emails/"
    },
    "sender_name": "Jim Jerzycke",
    "subject": "[amsat-bb] Re: Almost There",
    "date": "2014-01-05T01:55:11Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7AEPBTLLLKXPJ4BJP75HIUAQKZEN5IOO/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Getting rid of the diplexer will reduce the loss, but not improve the \ngain. The gain is dependent on the design of the antenna.\n\n73, Jim  KQ6EA\n\nAdding a preamp at the antenna is always a good idea for satellite use.\n\n\nOn 01/05/2014 12:42 AM, Joel Black wrote:\n> After a rocky start to my Christmas Vacation (I fell off a ladder \n> while pruning limbs from a tree - nothing broken, just banged up and \n> bruised), I almost have my satellite station back on the air.\n>\n> After doing some selling and horse-trading, I am back in possession of \n> my FT-847 that I sold to my dad.\n>\n> After cleaning out my storage building, I found a couple of fairly \n> long runs of LMR400UF. I need to measure them, but I think it is more \n> than enough to get me outside and up the mast.\n>\n> I also have a U-100 control box thanks to someone on the list.\n>\n> I operate an iMac with Mac OS X 10.9.1 so, for now, I am using SatPC32 \n> on my virtual machine. I have played around with MacDopplerPro, but it \n> locks up on my computer continuously. I don't know if it has something \n> to do with the USB-to-serial converter (I *do* have a null modem cable \n> between the USB-to-serial converter and the FT-847), or if MDP is just \n> limited in the unregistered version. The USB adapter works fine with \n> my K3.\n>\n> Let me ask a question about the Arrow Antenna. Someone mentioned Elk \n> Antennas and, while I'm sure it's a fine product, I am already in \n> possession of the Arrow. I've done a lot of reading and without \n> getting into the arguments about Arrow vs. Elk and length of elements, \n> etc., element isolation, and published vs. unpublished gain amounts \n> let me tell you what I'm thinking:\n>\n> First, I'm going to eliminate the diplexer. I will not need it for one \n> thing. For another, it's limited to 10 W max input. From what I have \n> read, my gain will be increased quite a bit. I don't remember the \n> exact amount, but it's quite dramatic.\n>\n> Second, the feed on the Arrow is a gamma match. From my reading, and \n> I'm no engineer, for a gamma match to work properly the element(s) (at \n> least the driven element) needs to be grounded. That's fine and, \n> again, I don't want to get into the \"why's\" I just want to make sure \n> I'm correct. Therefore, my question is:\n>\n> Is there any reason I cannot turn the driven element 90 degrees to \n> allow for a better connection to the BNC connector? Maybe not even 90 \n> degrees, but enough to get to the BNC connector without the male \n> connector on the cable touching the boom. I want to weatherproof those \n> connections. What I'd like to do after I turn the gamma match is feed \n> it with a very short length of LMR240 and then into a preamp. After \n> the preamp, I'll have the LMR400UF to run to the FT-847. Most gamma \n> matches I see on commercial antennas are on the side of the antenna - \n> if horizontal, they're below (or above) the boom; if vertical, it's \n> off to one side. The Arrow is the only antenna I've seen with a gamma \n> match on which the gamma match is not to one side or the other of the \n> boom. I hope I'm making sense.\n>\n> Anyway, I wanted to let those folks who helped out know that I \n> appreciate it and that I'm much closer to being back on the birds than \n> I was a few weeks ago.\n>\n> 73,\n> Joel - W4JBB\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite \n> program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
    "attachments": []
}