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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5EJY2OYGLEPCL3TDAWTR5PQAL2DXPQUN/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "5EJY2OYGLEPCL3TDAWTR5PQAL2DXPQUN",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PPXDQMVNMMNPWL2JRDLSXLWBNPOTCWRM/?format=api",
    "sender": {
        "address": "al7eb (a) acsalaska.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Edward R. Cole",
    "subject": "[amsat-bb] Re: Pre amp question",
    "date": "2006-12-14T09:01:23Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DKIJP4OQZD6USZ4JCLBSFB5VB3TRNSOL/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Greg,\n\nYes, you can do it by reducing the RF gain to minimum which generally opens\nthe AGC to max gain.  Since the noise floor is not a large signal, it will\nnot drive the AGC very much this way.  Note, do not use your s-meter for\nthese readings.  Connect a good audio voltmeter (ideally with a good analog\nscale).\n\nAnother approach is to use a step attenuator in front of the receiver:\nYou set you reference on cold sky the same, then point at horizon and\nadjust attenuation until the audio meter reads the same reading as cold\nsky.  The amount of attenuation in dB give the result.  AGC does not affect\nthis method.\n\n73's Ed - KL7UW\n\nAt 07:48 PM 12/13/2006 -0800, Greg D. wrote:\n>\n>Is this test useful on a receiver where the AGC cannot be turned off?  My \n>FT-736 has only fast/medium/slow.  No off.  I would expect a reduction in \n>accuracy, but is it even worth doing?\n>\n>Greg  KO6TH\n>\n>\n>----Original Message Follows----\n>From: \"i8cvs\" <[email protected]>\n>To: \"Steve Raas\" <[email protected]>, \"AMSAT-BB\" <[email protected]>\n>Subject: [amsat-bb] Re: Pre amp question\n>Date: Wed, 13 Dec 2006 20:55:50 +0100\n>\n>Hi Steve, N2JDQ\n>\n>If your receiver has the capability to switch OFF the AGC than the following\n>simple test will tell you if your preamplifier connected to the actual\n>antenna is working or not for you:\n>\n>{snip}\n>\n>_________________________________________________________________\n>Get the latest Windows Live Messenger 8.1 Beta version. Join now. \n>http://ideas.live.com\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",
    "attachments": []
}