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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IEEAA26UQZNA6GYIG24XSOMCL4YKKTC7/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "1646596578.18132481269458856799.JavaMail.root@sz0126a.emeryville.ca.mail.comcast.net",
    "message_id_hash": "IEEAA26UQZNA6GYIG24XSOMCL4YKKTC7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/63256OQWBXII7QQ5AE3XBBBDSS6Z7FUX/?format=api",
    "sender": {
        "address": "w7lrd (a) comcast.net",
        "mailman_id": "717aa2a241704c7497e9abd8c983f6b7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/717aa2a241704c7497e9abd8c983f6b7/emails/?format=api"
    },
    "sender_name": "Bob- W7LRD",
    "subject": "[amsat-bb] Re: ICOM AG-25, 2M Mast Mounted Preamplifier",
    "date": "2010-03-24T19:27:36Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/63256OQWBXII7QQ5AE3XBBBDSS6Z7FUX/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\nThe preamp is the Icom AG-25, which in the past has had questionable or unknown specs.  Thanks to Stan now we know. \n\n73 Bob W7LRD \n\n\n----- Original Message ----- \nFrom: \"W1LE Stan\" <[email protected]> \nTo: [email protected] \nSent: Wednesday, March 24, 2010 10:23:59 AM GMT -08:00 US/Canada Pacific \nSubject: [amsat-bb]  ICOM AG-25, 2M Mast Mounted Preamplifier \n\nHello The Net: \n\nI recently got in Bob's (W7LRD) preamp for testing, with the following \nresults: \n\n144 MHz  G = 27 dB     NF = 1.3 dB \n145          G = 27 dB     NF = 1.1 dB \n146          G = 27 dB     NF = 0.9 dB \n147          G = 26 dB     NF = 0.8 dB \n148          G = 25 dB     NF = 0.9 dB \n\nPerformance is better than I expected, but lotsa gain. \n\nDC voltage applied was 14 Vdc and lowered to 8 Vdc with no change in NF, \nbut a 1 dB reduction in gain. \nDC current was ~200 milliamperes at 14 V and 117 milliamperes at 8.0 \nvolts applied. \nBelow 8 Vdc, the gain decreases rapidly and the NF increases. \nI like the wide operating voltage range. \n\nThe RF connectors are UHF type. \nThere is a larger screw with a plastic washer underneath, \nbut upon removal there is NO adjustment underneath for neither pass band \ntuning or gain reduction. \n\nReportedly there is a variable capacitor inside to allow tuning, but \nnothing externally accessible. \n\nHas anyone found a adjustment for gain ? \n\nOnly choice I can think of is to reduce the RF gain on the transceiver \nwhen the preamp is menu enabled. \n\nIf an attenuator is put in line, the TX power would also be attenuated. \n We do not want to just throw away RF power in an attenuator \n\nStan, W1LE       Cape Cod     FN41sr     Cape Cod \n\n\n\n\nZZZZz \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",
    "attachments": []
}