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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3OYS7AL6POTXBPXZI5XSTLGDGBNPV453/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "014CF7DFF1A14D8282751ABC369E931E@TAMSAT",
    "message_id_hash": "3OYS7AL6POTXBPXZI5XSTLGDGBNPV453",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3OYS7AL6POTXBPXZI5XSTLGDGBNPV453/",
    "sender": {
        "address": "hs1jan (a) tamsat.org",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Tanan Rangseeprom HS1JAN",
    "subject": "[amsat-bb] Re: V/U Linear Transponder",
    "date": "2013-07-31T00:24:32Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Dear Andrew Glasbrenner and All\n\nWe had mail to [email protected] but do not have respond feedback. if you \nhave detail e-mail or contact list of turksat team please advice to me.\n\nbest Regards\n\nTanan Rangseeprom HS1JAN\n\n\n----- Original Message ----- \nFrom: \"Andrew Glasbrenner\" <[email protected]>\nTo: \"Tanan Rangseeprom HS1JAN\" <[email protected]>\nCc: \"PE1RDW\" <[email protected]>; <[email protected]>; <[email protected]>; \n<[email protected]>; <[email protected]>; <[email protected]>\nSent: Wednesday, July 31, 2013 12:08 AM\nSubject: Re: [amsat-bb] Re: V/U Linear Transponder\n\n\nYou may want to reach out to the turksat 3U team. Although the satellite has \nhas problems, I believe it has redundant v/u transponders on board.\n\n73, Drew KO4MA\n\nSent from my iPhone\n\nOn Jul 30, 2013, at 12:04 PM, \"Tanan Rangseeprom HS1JAN\" <[email protected]> \nwrote:\n\n> Dear All\n>\n> Thanks respond for help to me\n>\n> 1.Thailand has regular to forbid for transmitt UHF band but can receive \n> the signal for amateur radio satellites only. we need to used VHF band \n> same like transponder  of Japanes (FO-29) , AmSat AO-51 , Saudiarabia \n> SO-50 and other satellites. for interference from China Thailand and other \n> countries on VHF is normal.\n>\n> 2.Ok, I do not have knowledge 100 khz bandwidth is too much for the over \n> power. please advice me for 30 khz uplink 145.90-145.92 MHz VHF / 435.10 - \n> 435.12 MHz UHF of  liner transponder.\n>\n> 3.We have to design FM repeater use to modify HX1 / RX2A RADIOMETRIX VHF / \n> UHF transmitter module we have change x-tal to 145.90 MHz / 13.59 MHz and \n> used MC3361 with x-tal 10.245 MHz and CML IC FX465 CTCSS Encode/Decode \n> build test it to be successful.\n>\n> We and technical team of TAMSAT group would like to help and advice for \n> circuit diagram of V/U transponder same like transponder of Japanes \n> (FO-29) and other satellites. We had mail to Mr.William Leijenaar PE1RAH \n> but do not have respond feedback. Mrs Thida of 100watts ham radio magazine \n> of thailand sugges me to know Mr.William.because she meet him on Tokyo ham \n> fair 2009.\n>\n> On this time we and technical team of TAMSAT group need help very urgent. \n> we need advice of circuit diagram or datasheet  IC for build V/U Liner \n> transponder  for payload 1U cubesat of JAISAT satellite project.\n>\n> best regards\n>\n> Tanan Rangseeprom HS1JAN\n> Project Manager of JAISAT-1\n> member of RAST\n> email : [email protected]\n>\n>\n> ----- Original Message ----- From: <[email protected]>\n> To: <[email protected]>\n> Sent: Monday, July 29, 2013 5:24 PM\n> Subject: Re: [amsat-bb] V/U Linear Transponder\n>\n>\n> Dear Tanan.\n>\n> Thanks for the mail via AMSAT.org\n>\n> My name is David Bowman  G0MRF and I'm a member of the team building\n> FUNcube, due for launch this November.\n>\n> I can help with transponder design, but there are some points which you\n> need to consider.\n>\n> 1) The use of V band for the uplink will be a poor choice for your\n> location.  The interference from China and other countries on 145MHz\n> will mean the transponder will not be usable.   Using U band for the\n> uplink is a much better choice.\n>\n> 2) The 100kHz bandwidth is too much for the typical power available\n> from a CubeSat. If you get your RF team to do a link budget analysis,\n> you will see the cubesat power budget will not support 100kHz of\n> bandwidth. Ususally 30kHz is as much as you can do with a 1U cube.\n>\n> 3) You may want to consider a FM 'repeater' as there is now only 1 in\n> orbit, while there are several linear transponder satellites ready to\n> be launched.\n> The FM design will allow you to run a very efficient power amplifier\n> (70%) and power can be saved over oceans and areas of low population by\n> using a 67Hz access tone (CML FX465)\n>\n> I can assist with design but would need to know if you are planning a\n> 1U 2U or 3U design.\n>\n> William PE???? is good, but will probably just offer to sell you a\n> transponder.\n>\n> Regards\n>\n> David  G0MRF\n>\n> some old info is available at   www.g0mrf.com/transponder.htm\n>\n> The attached powerpoint has some pictures of the UV transponder and\n> other boards in FUNcube from AMSAT-UK\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",
    "attachments": []
}