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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/32KVFTXBPOEJ4GXUVEKHJN4PXERIPXQY/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "32KVFTXBPOEJ4GXUVEKHJN4PXERIPXQY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5LHY6POLP3L3I5NQ3OU5ODHV5YJHTAZL/?format=api",
    "sender": {
        "address": "nate (a) natetech.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Nate Duehr",
    "subject": "[amsat-bb] Re: \"Birdies\" from Linksys Wireless router",
    "date": "2008-05-09T06:58:18Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5LHY6POLP3L3I5NQ3OU5ODHV5YJHTAZL/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/64VIYJ5CLZ4BXLURKAN7URNSPJDOBNNK/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nOn May 6, 2008, at 4:58 PM, Mark L. Hammond wrote:\n\n> Hello all,\n>\n> The launch of Delfi-C3 has brought to my attention a very strong  \n> birdie at 145.930 MHz that clearly comes from the Linksys WRT54G  \n> Wireless router that sits in the shack.  Forcing the wireless signal  \n> to another frequency/channel has no impact whatsoever...\n>\n> Anybody on the list have a clever solution (other than 'get a  \n> different router' or 'move it' or 'shut it off', etc...hi hi) that  \n> they may have used for a similar problem?\n>\n> Thanks,\n>\n> Mark L. Hammond  [N8MH]\n\n\nMark,\n\nMy Linksys WRT54GS annoyed the heck out of me with birdies, so I  \nreplaced it with a cheap Netgear.  Not a peep out of it, since then.\n\nI liked having DD-WRT on the Linksys device a couple of years ago when  \nI was using it, but the Linksys is stashed away in a box for  \n\"emergencies\" and otherwise banned from my shack now, due to the RF  \nissues.\n\nIronically I had already tried the \"power the house down to see if the  \ninterference is local\" and had decided it wasn't, and that I needed to  \ndo some DF'ing... then I realized that the server and the WRT54GS were  \non the UPS, which I had NOT shut off.  (Doh!  Smacks forehead...)\n\nI did try briefly to do things like ferrites on the \"goes-intas\" and  \n\"goes-outtas\", etc... to no perfect effect.  I could mitigate some of  \nthe noise, but the thing was ultimately just too noisy.   The wall- \nwort for my particular model (there are something like six different  \nhardware models of the WRT54GS -- another annoying pattern of the  \nsmall router manufacturers) was just a transformer... whether or not  \nthere was a noisy switch-mode power supply inside the Linksys, I  \ndidn't investigate.\n\nSomeone else commented about using \"quality Cat 5 and Cat 6 cable\"...  \nsince Cat 5 and Cat 6 are ratings for UNSHIELDED twisted-pair (UTP), I  \nhave no idea what differing \"quality\" levels of cable would  \naccomplish.  Ethernet via Cat 5 is SUPPOSED to leak signal.  Someone  \nmissed reading the standards, I guess.  The comment made no sense to  \nme from an RF engineering perspective.\n\nOne possible \"fix\" for that type of noise could be to run Ethernet on  \nSHIELDED twisted-pair (STP) cable, and ground the \"drain\" wire at ONE  \nend (don't ground both ends, you WILL create a ground loop, and it  \nWILL drive you crazy... eventually) but it no longer will meet the  \nEthernet specifications for cross-talk, etc.   Frankly, it works --  \nbut don't go doing it in the office or someplace where the network is  \ncritical.   They make special RJ45 connectors with metal strips  \n\"wrapped around\" the connector body that can be crimped in such a way  \nas to capture the drain wire, and that are built to ground to special  \nfemale RJ45 sockets... again, only do this on one end... and they were  \nusually used for things like telco T1 carriers that *are* specified to  \nuse STP cabling in many instances.\n\nI don't think the real noisemaker in the Linksys was the Ethernet  \nsignal itself anyway -- it certainly leaked out of the cheap plastic  \n(virtually unshielded) case via the Ethernet cablilng, but the  \nEthernet noise wasn't the problem.  It was so cheap to try another  \nrouter, the \"fixes\" weren't worth my time.  Easier to buy from Netgear  \nwho's had a pretty good track record of actually building properly  \nshielded products, back to when their little switches, hubs, and other  \ndevices were all in the \"blue metal case\", complete with a real ground  \nterminal and lug on the back-side, which is a \"body style\" they're not  \nmaking many of anymore...\n\nSame thing with cheap plastic PC cases... noise galore leaking from  \nthose, too.  Makes one miss the days of steel cases and PCs you could  \nbarely lift.\n\nMy IBM/Lenovo T43 provided by work throws all sorts of VHF crud,  \nenough to completely obliterate the front-end of my poor Kenwood TH- \nF6A \"broad as a barn door\" receiver on most of the VHF band (IF mixing  \nperhaps), and the MacBook is more bearable, but the LCD backlight  \nsystem makes RF noise.\n\nI guess with the ever-lowing price of fiber-optic based networking  \ngear... that's the ultimate in quiet, as long as you can keep the  \nrouters/switches themselves from leaking crud... but that's definitely  \noverkill.  Overkill is sometimes what we hams do best, however.  I  \nhave seen the photos to prove it.  (GRIN)  We are the only HOBBY  \norganization that regularly launches satellites... or so I'd like to  \nbelieve.  (BIGGER GRIN)\n\nGood luck killing off the Linksys RF interference gremlins.  Netgear  \nhighly recommended!\n\n--\nNate Duehr, WY0X\[email protected]\n\n\n\n",
    "attachments": []
}