Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/64VIYJ5CLZ4BXLURKAN7URNSPJDOBNNK/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000901c8b64c$cf7992c0$6501a8c0@QUECREEK",
    "message_id_hash": "64VIYJ5CLZ4BXLURKAN7URNSPJDOBNNK",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5LHY6POLP3L3I5NQ3OU5ODHV5YJHTAZL/?format=api",
    "sender": {
        "address": "wb3jfs (a) cox.net",
        "mailman_id": "bdfc678d05af4f3f96c14d823fd3fbcf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bdfc678d05af4f3f96c14d823fd3fbcf/emails/?format=api"
    },
    "sender_name": "Jeff Yanko",
    "subject": "[amsat-bb] Re: \"Birdies\" from Linksys Wireless router",
    "date": "2008-05-15T05:30:39Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/32KVFTXBPOEJ4GXUVEKHJN4PXERIPXQY/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I found this topic interesting since I too have a Linksys WRT54G router, \nwhich is also in the shack.  I decided to listen for the \"birdies\".  I tuned \nto 145.93 mHz on the HT while sitting in the chair and.....nothing.  Hmmm. \nSo I stood up and moved around then lo and behold a strong birdie  as I got \nvery near the router.  I did notice one thing, the birdie completely \ndisappears about 2 to 2.5 feet from the unit.  My router is on one side of \nthe room about 12 to 13 feet away from the desk.  I have absolutely no copy \nof the birdie with the HT on the desk.  A possible solution could be if you \nhave a large enough room, move the router off of and away from the desk with \nthe VHF equipment on.\n\n73,\n\nJeff  WB3JFS\n\n\n----- Original Message ----- \nFrom: \"Nate Duehr\" <[email protected]>\nTo: \"Amsat-Bb\" <[email protected]>\nSent: Thursday, May 08, 2008 11:58 PM\nSubject: [amsat-bb] Re: \"Birdies\" from Linksys Wireless router\n\n\n>\n> On 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>\n> Mark,\n>\n> My Linksys WRT54GS annoyed the heck out of me with birdies, so I\n> replaced it with a cheap Netgear.  Not a peep out of it, since then.\n>\n> I liked having DD-WRT on the Linksys device a couple of years ago when\n> I 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\n> issues.\n>\n> Ironically I had already tried the \"power the house down to see if the\n> interference is local\" and had decided it wasn't, and that I needed to\n> do some DF'ing... then I realized that the server and the WRT54GS were\n> on the UPS, which I had NOT shut off.  (Doh!  Smacks forehead...)\n>\n> I 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\n> the noise, but the thing was ultimately just too noisy.   The wall-\n> wort for my particular model (there are something like six different\n> hardware models of the WRT54GS -- another annoying pattern of the\n> small router manufacturers) was just a transformer... whether or not\n> there was a noisy switch-mode power supply inside the Linksys, I\n> didn't investigate.\n>\n> Someone else commented about using \"quality Cat 5 and Cat 6 cable\"...\n> since Cat 5 and Cat 6 are ratings for UNSHIELDED twisted-pair (UTP), I\n> have no idea what differing \"quality\" levels of cable would\n> accomplish.  Ethernet via Cat 5 is SUPPOSED to leak signal.  Someone\n> missed reading the standards, I guess.  The comment made no sense to\n> me from an RF engineering perspective.\n>\n> One possible \"fix\" for that type of noise could be to run Ethernet on\n> SHIELDED twisted-pair (STP) cable, and ground the \"drain\" wire at ONE\n> end (don't ground both ends, you WILL create a ground loop, and it\n> WILL drive you crazy... eventually) but it no longer will meet the\n> Ethernet specifications for cross-talk, etc.   Frankly, it works --\n> but don't go doing it in the office or someplace where the network is\n> critical.   They make special RJ45 connectors with metal strips\n> \"wrapped around\" the connector body that can be crimped in such a way\n> as to capture the drain wire, and that are built to ground to special\n> female RJ45 sockets... again, only do this on one end... and they were\n> usually used for things like telco T1 carriers that *are* specified to\n> use STP cabling in many instances.\n>\n> I don't think the real noisemaker in the Linksys was the Ethernet\n> signal itself anyway -- it certainly leaked out of the cheap plastic\n> (virtually unshielded) case via the Ethernet cablilng, but the\n> Ethernet noise wasn't the problem.  It was so cheap to try another\n> router, the \"fixes\" weren't worth my time.  Easier to buy from Netgear\n> who's had a pretty good track record of actually building properly\n> shielded products, back to when their little switches, hubs, and other\n> devices were all in the \"blue metal case\", complete with a real ground\n> terminal and lug on the back-side, which is a \"body style\" they're not\n> making many of anymore...\n>\n> Same thing with cheap plastic PC cases... noise galore leaking from\n> those, too.  Makes one miss the days of steel cases and PCs you could\n> barely lift.\n>\n> My IBM/Lenovo T43 provided by work throws all sorts of VHF crud,\n> enough to completely obliterate the front-end of my poor Kenwood TH-\n> F6A \"broad as a barn door\" receiver on most of the VHF band (IF mixing\n> perhaps), and the MacBook is more bearable, but the LCD backlight\n> system makes RF noise.\n>\n> I guess with the ever-lowing price of fiber-optic based networking\n> gear... that's the ultimate in quiet, as long as you can keep the\n> routers/switches themselves from leaking crud... but that's definitely\n> overkill.  Overkill is sometimes what we hams do best, however.  I\n> have seen the photos to prove it.  (GRIN)  We are the only HOBBY\n> organization that regularly launches satellites... or so I'd like to\n> believe.  (BIGGER GRIN)\n>\n> Good luck killing off the Linksys RF interference gremlins.  Netgear\n> highly recommended!\n>\n> --\n> Nate Duehr, WY0X\n> [email protected]\n>\n>\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\n",
    "attachments": []
}