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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/46L224GGAFVC37SYHZ3QS3SZJYVBUDU3/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "46L224GGAFVC37SYHZ3QS3SZJYVBUDU3",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GXY22NGUKDQKJQMFMSDHPONBULWNHX5G/",
    "sender": {
        "address": "maccody (a) att.net",
        "mailman_id": "b6473a44d40d4c91b7f8bb74bef3b879",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b6473a44d40d4c91b7f8bb74bef3b879/emails/"
    },
    "sender_name": "Mac A. Cody",
    "subject": "Re: [amsat-bb] Potential 23cm FM transmitter",
    "date": "2018-01-31T01:46:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GXY22NGUKDQKJQMFMSDHPONBULWNHX5G/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RVOVN4BCL6X6HMEKCHMLTSP6WFHRBBC2/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "This is my third attempt to post this message.  It seems that the AMSAT-BB\nblocks messages with JPEG attachments.  Below is a Google translation of\nthe article on the 23cm transceiver inDKARS magazine.\n\n73,\n\nMac Cody / AE5PH\n\nVHF-UHF-SHF News\nThis month provided by Hans van Alphen, PAØEHG\n\nNice new transistor for 23 cm PA\n\nSince the beginning of this year NXP has a nice power LDMOS transistor \nin the range for the 23 cm band.\nThe transistor type: MRFE8VP13350 assumes pre-matched adaptation and is \ndesigned for industrial, scientific and medical applications. The \ntransistor is capable of supplying 350 watts in the frequency range 700 \nto 1300 MHz, which is also ideal for our 23 cm band.\nWith a typical LDMOS supply voltage of 50 volts, approximately 10 to 14 \namps is required to get the 350 watt output with a control of 8 watts, a \ncomfortable 16 dB gain.\n\nItalian Technology Broadcast offers 490 Euro ex VAT a module for sale \nconsisting of a built pallet with all parts on it and a copper base of \n9.5 mm thick that needs to be mounted on a cooling plate.\n\nFurther information and how to order this unit can be found via:\nhttp://vhelectronics.sk/index.php/en/rf-modules-and-boxes/alx-350-detail\n\nFor those for whom this power is not yet sufficient, NXP has also \nannounced a bigger brother, the MRF13750H, which can deliver an output \nof no less than 750 Watts in the band from 700 MHz up to and including \n1300 MHz. With almost 20 dB gain, approximately 10 Watts is sufficient \nto send the transistor. This transistor will probably soon be on the \nmarket and possibly also as a complete one\npower pallets become available. Data from this transistor can be found at:\nhttps://www.nxp.com/docs/en/data-sheet/PRF13750H.pdf\n\n70 cm EME with only 10 watts\nOn 2 December 2017, the M6EBQ succeeded in making a 70cm EME QSO with \nDL7APV with only 10 Watt output. The connection in WSJT was made with 10 \nW output from a Yeasu FT857 and as antenna a DG7YBN 70-17m 17 element Yagi.\n\nThe antenna used to design by DG7YBN uses a flat folded dipole with \nwhich very favorable characteristics can be achieved.\n\nThe antenna has the property that the side lobes at the back are very \nwell suppressed and thus a very good front-rear ratio for the length of \nthis antenna.\n\nWith 3.63 meters in length and a gain of 17.3 dBi and a front-back ratio \nof no less than 38 dB, this is also a very suitable antenna for \ncontests. Of course, therefore, there is also little noise picked up and \nthe antenna is also very suitable for moonbounce.\n\nInformation on how to make this antenna can be found at:\nhttp://dg7ybn.de/432MHz/GTV70_17m.htm\n\n\nOn 01/26/2018 01:43 PM, Brad Brooks wrote:\n> For those who receive the DKARS magazine, there is a very interesting article. The transceiver described is for ATV, but it looks like like it will tune to the AO-92 uplink frequency. Seems to put out 400mw FM out. I am not able to take time now to review deeper (stealing away from work) but I look forward to parsing through the schematic/links this weekend. I am forwarding this notice for anyone who will be able to get there sooner. I think there is some potential here, and I would like to know other’ opinions.\n>\n> Www.dkars.nl\n>\n> 73 Brad WF7T\n> Nashville TN EM66\n> _______________________________________________\n> Sent [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings:http://www.amsat.org/mailman/listinfo/amsat-bb\n\n\n",
    "attachments": []
}