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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OX2P5BNPVCFCZSMTYI2EHECFEPKAZG56/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "OX2P5BNPVCFCZSMTYI2EHECFEPKAZG56",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7X6KXDKQ5GKVW2KQ7TQ4ODDUR7ZBBEMU/?format=api",
    "sender": {
        "address": "michael.bd5rv (a) gmail.com",
        "mailman_id": "ff1b26cffb8a4a659951c3eb99d13227",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ff1b26cffb8a4a659951c3eb99d13227/emails/?format=api"
    },
    "sender_name": "Michael Chen",
    "subject": "[amsat-bb] Re: HT supports full duplex satellite operation",
    "date": "2009-10-20T17:36:10Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TDJOPCC2XKLX2TNF2XGSDB2WOC2TGXJV/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "All,\n\nMany thanks for those replies off the list.\nYes, just like Tim said, I am looking for HTs that are currently in\nproduction. I am trying to get local high school club station to work\nvia the satellites. A true full-duplex HT can make this process easily\naccepted by the students. At the same time, the school will always\nrequire new HT purchase from the market.\n\nIt's sad that I can't find a good choice.  DJ-G7 does not seem to be\ngood enough.\n\nI believe there will be a boost of satellite operation in China with\nthe launch of XW-1.\n\nMichael Chen, BD5RV/4\nEmail: [email protected]\nMSN: [email protected]\nSkype: michael-bd5rv\n\n\n\nOn Wed, Oct 21, 2009 at 12:57 AM, Tim - N3TL <[email protected]> wrote:\n> I intended to reply both to Michael and the BB, but I see that I simply\n> responded to him and not to \"all\" in my earlier note.\n>\n> My sense from his original post is that he is looking only for\n> current-production HTs, and I believe the Alinco is it when it comes to\n> full-fuplex-capable HTs.\n>\n> That being said, I have been doing some related research over the past\n> several months. Some BB readers may recall a post I made a few months ago\n> about \"the fully rechargeable satellite station.\" I have done some other\n> things that I hope to include in an article for an upcoming issue of  \"The\n> AMSAT Journal,\" and I have discovered something that, I believe, could\n> benefit all of us who enjoy using handheld stations.\n>\n> In addition to the TH-F6A HT from Kenwood, I have had an opportunity to use\n> a Yaesu VR-500 handheld all-mode receiver. The general coverage receiver in\n> the Kenwood is all-mode, as is the VR-500. Either also can serve as a\n> receive radio for a station on the linear satellites, albeit with manual\n> Doppler tuning.\n>\n> Most notable for those of us who enjoy using handheld stations for the FM\n> satellites is the fact that the Kenwood's general coverage receiver and the\n> Yaesu VR-500 each offer tuning steps down to 1 kHz and below, even in FM. As\n> I recall, the Kenwood HT can tune as finely as 33 Hz. The VR-500 will tune\n> as finely as 100 Hz. I routinely tune it in 1 kHz steps on the FM\n> satellites. Doing so enables me to track Doppler on the UHF downlinks of our\n> FM satellites much more accurately, and that has made a big difference in my\n> ability to make handheld contacts. Those who choose to ignore the inarguable\n> fact that high power isn't necessary for effective FM LEO satellite contacts\n> still make things difficult for me and others who enjoy using handheld\n> stations. I've accepted the fact that the situation won't ever change, which\n> is disappointing.\n>\n> Nonetheless - from here, I believe that using a 2-radio full-duplex setup\n> for the FM satellites that incorporates a receive radio capable of tuning in\n> 1 kHz (or finer) steps actually represents the most effective option because\n> of the improved receive capability the smaller tuning steps provide.\n>\n> Many of us would like to see more HT manufacturers adopt full-duplex as a\n> feature on at least one current-production model. I also would like to cast\n> my vote for (1) general coverage receivers that, like the TH-F6A, are\n> all-mode, and (2) tuning steps finer than 5 kHz for FM that will work on\n> both transmit AND receive.\n>\n> I am thrilled with the news that AMSAT is moving forward with plans to build\n> and launch a 1U cub sat with a U/V (Mode B) transponder. However,\n> consistently hitting the uplink with HTs that tune no finer than 5 kHz will\n> be a challenge. I learned that last winter when the ISS repeater was active\n> in Mode B. When I used my FT-817 as a transmit radio and could use the main\n> tuning dial to infinitely fine-tune the uplink, I had much better - and more\n> consistent - success hitting the uplink than with my HT, which will only\n> tune in 5 kHz steps.\n>\n> 73 to all,\n> Tim - N3TL\n>\n> 73 to all,\n> Tim - N3TL\n> Athens, Ga. - EM84ha\n> ________________________________\n> From: Alan P. Biddle <[email protected]>\n> To: Michael Chen <[email protected]>; [email protected]\n> Sent: Tuesday, October 20, 2009 12:02:14 PM\n> Subject: [amsat-bb] Re: HT supports full duplex satellite operation\n>\n> Michael,\n>\n> That is a good reference from JoAnne.  Most on the list will work well,\n> particularly the TH-D7 and the IC-W32A.  However, before you purchase one,\n> be certain to research how well it actually works for satellite ops.  For\n> instance, I have an Alinco DJ-G7 which has great specifications, but works\n> very poorly for satellite ops, though it is a nice general purpose unit.\n>\n> Alan\n> WA4SCA\n>\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On\n> Behalf Of Michael Chen\n> Sent: 20 October, 2009 09:12\n> To: [email protected]\n> Subject: [amsat-bb] HT supports full duplex satellite operation\n>\n> All,\n>\n> Could anyone list the HT models (available today in the market) that\n> support full duplex satellite operation?\n> I know I can get connected with two HTs and portable cross Yagi. Just\n> need a simpler solution.. IC-W23AT and TH-D7 are discontinued.\n>\n> Michael Chen, BD5RV/4\n> Email: [email protected]\n> MSN: [email protected]\n> Skype: michael-bd5rv\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 program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>\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 program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
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