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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/S6X4LSB4YJEUNM6RH4IB2NFICSGJMLNF/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "B054CDF581664B1AA90AE0D2EEC312C9@KC6UQH",
    "message_id_hash": "S6X4LSB4YJEUNM6RH4IB2NFICSGJMLNF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZTB5LN6FAVXPSPYLBDWQ2LW5CCYPRSTA/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "Art McBride",
    "subject": "[amsat-bb] Re: Another satellite-receiver option",
    "date": "2009-06-10T05:32:51Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6E4GYLPEK7DEILCUCCVNBR6QCMS65V4E/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SNJH6W6TF76G44VKHTWYC7EX7LMGIMMM/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Luc,\n When using a preamp in any metropolitan area a band pass filter is needed.\nHelicoil types are very good for VHF. DCS makes them or build one out of the\nRSGB Book. \nQFH antennas can be made 1/4 turn to 1 turn, 1/4 wave to 1 wave all with\ndifferent patterns. If done right they are a very effective antenna.\n\nNOAA Tiros N satellites run 5 watts on 137 MHz. On 70 cm AO-51 is 1/2 W and\nyou lose 9 dB more for the increase in frequency. You have 3dB less galactic\nnoise on 70 cm, and another 3 dB for reduced bandwidth 37 KHz to 16 KHz.\nDoing the math you are comparing 5 watts of (NOAA-18) to .250 effective\nwatts on AO-51 adjusted for noise power and frequency. A huge difference!\n\nArt,\nKC6UQH \n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Luc Leblanc\nSent: Tuesday, June 09, 2009 8:43 AM\nTo: [email protected]\nSubject: [amsat-bb] Re: Another satellite-receiver option\n\n\nI try also  to receive NOAA APT transmission with an helix but i got very\nmarginal results even with a preamp for 137khz. The signal was \nbetter but the pagers QRM was also boosted by about a factor of 5...\n\nThe only one viable solution was to use my VHF satellite beam with a PAR\nelectronics vhf notch filter part number 5602516. Of course you \nshould have a 50khz band pass below that results are also very marginal. I\ndon't know if the PCR-100 is able to received at this bandwidth \nbut the PCR-1000 can and it can be driven by WXtoimg software.\n\n\nP.S. My home made helix is available for 35$ plus shipping but a bit hard to\nsecurely fit inside a shipping box. pics available if needed.\n\nOn 8 Jun 2009 at 23:14, Jerry Clement wrote:\n\n> I use a Hamtronics R139 Weather fax Receiver with a QFH antenna that I\nbuilt for receving and decoding images from the weather birds such as NOAA\n18. I never had any luck with any of my other receivers such as my Icom R20,\nbeing to narrow for this purpose,  although I know of guy's who have\nmodified receivers successfully for just this purpose. My set up may be seen\non my website: www.stormchaser.cjb.net  click on: Quadrifilar Helix Antenna.\nThe page needs to be upgraded, as I use a newer laptop than the one shown. \n> \n> Jerry VE6AB\n> www.ve6ab.blogspot.com\n> _______________________________________________\n\n\n\n\"-\"\n\n\nLuc Leblanc VE2DWE\nSkype VE2DWE\nwww.qsl.net/ve2dwe\nWAC BASIC CW PHONE SATELLITE\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__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 4142 (20090609) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n\n\n \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 4142 (20090609) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n \n\n",
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}