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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PVYPGTJSRR3YX6WOBP5XDCXN2HJQ2HY7/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "PVYPGTJSRR3YX6WOBP5XDCXN2HJQ2HY7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7QNFOKCXOUE4OXP5G4NFVGEC226X43ZT/",
    "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] Re-purpose Cable Modems, headed to dumpsters ?",
    "date": "2020-10-11T16:28:42Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KYMWZW2RWOKCHBPN2KHKMWP3INTRH275/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I knew it would only be a matter of time before a Hackaday article on this\nwould be posted:\n\nThe Cable Modem To SDR Transformation\nhttps://hackaday.com/2020/10/10/the-cable-modem-to-sdr-transformation/\n\nThe link to stdw's Github.io site provides a lot more information:\nReverse engineering my cable modem and turning it into an SDR\nhttps://stdw.github.io/cm-sdr/\n\nThe webpage is an interesting read, if you are in to this sort of hackery.\nThe cable modem is a Motorola MB7220. The Wave file of the received FM\nradio station is a bit rough and a bit over-driven, but very good for\nsomeone with little RF experience, but a desire to try and learn.\n\nHis webpage also references an SDR project that uses and Analog Devices\ncable modem chip:\nHermes-Lite\nhttp://www.hermeslite.com/\n\nIt is far too easy to go down the 'rabbit hole' on this stuff!\n\n73,\n\nMac / AE5PH\n\nOn 10/10/20 11:36 AM, Mac A. Cody via AMSAT-BB wrote:\n> Greg,\n>\n> Interesting concept.  Thanks for the post!\n>\n> I scanned through the various sources and I cannot find which cable \n> modem or\n> firmware version is being used.  I also looked through the companion \n> Github\n> https://github.com/stdw/bcm3383-reverse-engineering\n> without gaining any insight.\n>\n> Looking at the OpenWrt webpage you referenced, the only cable modem \n> mentioned\n> that specifically uses the BCM3383 is the Technicolor TC7200. There are\n> probably others, though.\n>\n> I hope that more development occurs.\n>\n> 73\n>\n> Mac / AE5PH\n>\n> On 10/10/20 6:35 AM, Gregory Beat via AMSAT-BB wrote:\n>> Amateur Radio has a history of re-purposing Radio & Electronics \n>> surplus, for a variety of uses (receiving, transmitting, accessories, \n>> etc.).\n>>\n>> Recent posting on Github the past two weeks\n>> https://github.com/stdw/cm-sdr\n>>\n>> “cm-sdr” is a piece of software to turn a Broadcom BCM3383-based \n>> cable modem into a general purpose Software Defined Radio (SDR)\n>>\n>> In its current state, cm-sdr serves as a proof of concept. It can \n>> currently stream I/Q data to a peer via TCP. A script to demodulate \n>> and play FM radio broadcasts is also provided.\n>>\n>> cm-sdr is dependent on many functions and memory mapped registers in \n>> the unmodified firmware. Thus, at the moment it is highly tailored to \n>> one specific cable modem model and firmware version.\n>>\n>> ==\n>>\n>> Earlier work by OpenWrt with the Broadcom’s BCM33xx chipset.\n>> https://openwrt.org/docs/techref/hardware/soc/soc.broadcom.bcm33xx\n>>\n>> The BCM3383 DOCSIS 3.0 cable gateway System on a Chip (SoC) combines \n>> Broadcom's Full-Band Capture (FBC), dual-band concurrent Wi-Fi and a \n>> custom applications processor.\n>> https://www.broadcom.com/products/broadband/cable/modems/bcm3383\n>> Current Broadcom cable modem SoC offerings\n>> https://www.broadcom.com/products/broadband/cable/modems\n>>\n>> ==\n>> greg, w9gb\n>>\n>> _______________________________________________\n>> Sent via [email protected]. AMSAT-NA makes this open forum available\n>> to all interested persons worldwide without requiring membership. \n>> Opinions expressed\n>> are solely those of the author, and do not reflect the official views \n>> of AMSAT-NA.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite \n>> program!\n>> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n>\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. \n> Opinions expressed\n> are solely those of the author, and do not reflect the official views \n> of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite \n> program!\n> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n\n\n",
    "attachments": []
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