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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3PZGQCUCSGPZFBRQVGNOAV6Z2TLIAJYM/?format=api",
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    "message_id": "[email protected]",
    "message_id_hash": "3PZGQCUCSGPZFBRQVGNOAV6Z2TLIAJYM",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NLVFLZ7LLMYWFRA5VQFRYPIIQ47MCIR2/?format=api",
    "sender": {
        "address": "e.krome (a) comcast.net",
        "mailman_id": "766b8392e3f2472daca542f6b2b8c371",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/766b8392e3f2472daca542f6b2b8c371/emails/?format=api"
    },
    "sender_name": "Ed Krome",
    "subject": "Re: [amsat-bb] \"Reverse\" bias-tee ??",
    "date": "2017-11-27T02:37:07Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NLVFLZ7LLMYWFRA5VQFRYPIIQ47MCIR2/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Of course. If your preamp has a D.C. Blocking capacitor at the output, you can usually extract the D.C. by simply putting a small RF choke on the output pin. You MUST have a blocking cap. Generally, for narrow band use, it's not fussy. ARR suggested a 1 mH RFC. Try it. \nBias T's get fancy only if you want broad frequency coverage.\n\nEd Krome K9EK\nSent from my iPhone\n\n> On Nov 26, 2017, at 3:02 PM, Scott <[email protected]> wrote:\n> \n> Hi everyone.\n> \n> The schematic makes me think \"yes\", but I wanted to check before making a\n> purchase.\n> \n> Normally a bias-tee is used to inject a DC voltage onto your coax to power\n> a pre-amp.  Since some pre-amps aren't powered off the coax, but rather\n> from a separate pair of pins, I was wondering if you can use a bias-tee AT\n> THE PRE-AMP to extract the DC voltage off our coax for connection to those\n> external power pins on the pre-amp?\n> \n> Running a separate cable to power the pre-amp is not the end of the world,\n> but it would be convenient if I could turn on the bias voltage available on\n> the Airspy or RTL-SDR and then extract it up at the antenna to power a\n> pre-amp.\n> \n> Thanks for any recommendations!\n> \n> -Scott,  K4KDR\n> _______________________________________________\n> Sent via [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",
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}