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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FD5SMUQ4XVJ4JTQ7H7HEQPRRCXG7KBFU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "FD5SMUQ4XVJ4JTQ7H7HEQPRRCXG7KBFU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IWWY6RGX65IMUT35RQMX7IEVZYF64LU4/?format=api",
    "sender": {
        "address": "n3tl (a) bellsouth.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Tim - N3TL",
    "subject": "[amsat-bb] Re: Arrow antenna reconfiguration results",
    "date": "2009-09-24T17:40:15Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IWWY6RGX65IMUT35RQMX7IEVZYF64LU4/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hey Jeff,\n\nThank you for posting this information about the Arrow. It's very interesting, indeed. The primary reason I switched from the Arrow I used to own to the Elk dual-band log periodic was because the Elk heard so much better. Patrick, WD9EWK, and I both routinely are able to work various satellites down to the horizon, depending on the pass. I use a Diamond MX-72H duplexer here. It's about the same price as the Comet you mentioned, and its loss figures are roughly the same, maybe a bit better. I use six feet of RG-8X for feedline. I'm using a duplexer because I don't have a full-duplex-capable radio. Since the Elk is dual-band, with one feed point, I need a duplexer to connect two radios - one for transmit, one for receive. On those passes when I use just one HT in half-duplex operation, I connect the radio directly to the Elk. \n\nHave you taken any note regarding specific times you are hearing the satellites at AOS and LOS and compared them to tracking software like Orbitron? Doing so will give you a really good idea of how low you can go with your new setup. Congratulations on the improvement you've achieved, and thanks again for sharing it with all of us who read the BB.\n\n73 to all,\n\nTim - N3TL\nAthens, Ga. - EM84ha\n\n\n\n\n________________________________\nFrom: Jeff Yanko <[email protected]>\nTo: [email protected]\nSent: Thursday, September 24, 2009 5:17:23 AM\nSubject: [amsat-bb] Arrow antenna reconfiguration results\n\nHi all,\n\nAfter being off the air for about a month, I recently made some changes to \nthe satellite setup.  I upgraded from the TH-D7A(G) HT to the TM-D710A \nmobile dual bander.  Yes, a bit bulkier, but worth its weight.  Anyhow, I \nknow many sat operators use the Arrow antenna setup, like what I've been \nusing the past 7 or so months with great results.  However, I've always \nknown that the diplexer that comes with the unit is reather lossy.  From \nsome reports I've read as much as 2.65dB of loss.  That's almost half of \nwhats being received or transmitted being thrown away.  When I layed out the \nnew portable setup I made it an issue to \"lose\" the diplexer and put one in \nline that would perform better.  I purchased the Comet CF-416.  It's loss is \nabout .26dB.  A considerably less amount by far and if needed in other \napplications it can handle more power than the 10 watts alotted for the \nArrow's diplexer.  I also bought some good quality RG-58 coax, only 6 feet \nin length, for both 145 and 440, so there isn't much loss from this.  About \n.6dB according to the data sheet.\n\nAfter the assembly and installation was complete, on air usage was next. \nAO-27 had a fairly decent pass to the east of the QTH with a max elevation \nof 24 degrees.  I've remembered how the passes sounded previously at this \nelevation so I could get a mental comparison.  As the bird's timer turned \nthe digital transmission on I noticed one thing immediately, the signal was \nclearer and no hiss.  The analog timer swtiched on and the voices became \ncopiable.  The signal appeared to be a bit stronger than the old setup with \nthe Arrow antenna but the most remarkable improvement was from the time I \nstarted to receive the signal to near LOS, it never once dropped out!  It \nalmost appeared as though I changed my linear antenna to a CP with a preamp.\n\nI figured this is too good to be true.  I then decided to test it with AO-51 \nand see how well that bodes.  I noticed I was copying the signal closer to \nthe horizon than the previous set up and again the same results with no drop \nouts, except for the one time the house blocked the signal for about 20 \nseconds.\n\nSo if anybody is considering improving their current Arrow antenna, please \ndo so by getting a better diplexer.  They are not expensive, $40 to $60, and \nof course some decent coax, short runs are better but give yourself enough \nslack so you don't cut yourself short!\n\nSee you on the birds!\n\n\n73,\n\nJeff  WB3JFS\nLas Vegas, NV\nDM26\n\n\n\n\n\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}