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#1
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My Actiontec GT701-WG router pretty much obliterates the 17m band when its
radio is active. It's probably causing some interference on other bands, but 17m is pretty much useless when it's active. Changing the router's WiFi channel has no effect on the noise. Since the PC in the shack is hard-wired, I can disable the router's radio if I need to, but I'd rather fix the problem. Anybody ever encountered a problem like this and fixed it? I could switch to another compatible brand of router if I knew that it was trouble free. -- Bert Hyman W0RSB St. Paul, MN |
#2
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On Wed, 17 Nov 2010 17:38:37 EST, Bert Hyman wrote:
My Actiontec GT701-WG router pretty much obliterates the 17m band when its radio is active. It's probably causing some interference on other bands, but 17m is pretty much useless when it's active. Changing the router's WiFi channel has no effect on the noise. Seems a bit of a jump in frequency to make that much of a difference? -- Henry Pizzinger Institution for the Mentally 31337 AzzMazta, Chairman & CEO www.xcopfly.com |
#3
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wait untill you get one of the new smart meters
![]() from youre power company -- AL'S COMPUTERS "AzzMazta" wrote in message ... On Wed, 17 Nov 2010 17:38:37 EST, Bert Hyman wrote: My Actiontec GT701-WG router pretty much obliterates the 17m band when its radio is active. It's probably causing some interference on other bands, but 17m is pretty much useless when it's active. Changing the router's WiFi channel has no effect on the noise. Seems a bit of a jump in frequency to make that much of a difference? -- Henry Pizzinger Institution for the Mentally 31337 AzzMazta, Chairman & CEO www.xcopfly.com |
#4
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On 11/17/2010 5:38 PM, Bert Hyman wrote:
Changing the router's WiFi channel has no effect on the noise. It would not.. The "Radio" frequency in the router is like 800 MHZ, way above the 17 meter band. BUT the clock frequency... That's what is hammering you.. That or the data rate. Most likely the clock though or everybody would be seconding this thread. |
#5
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My Actiontec GT701-WG router pretty much obliterates the 17m band when its
radio is active. It's probably causing some interference on other bands, but 17m is pretty much useless when it's active. Changing the router's WiFi channel has no effect on the noise. Seems a bit of a jump in frequency to make that much of a difference? It may be power-supply-related noise, or noise from some of the baseband digital circuitry. I've run into (and helped diagnose) a couple of significant interference problems involving consumer-grade networking gear: - Significant "birdies" on the 2-meter band, appearing every few tens of kHz, with no modulation apparent. One of them sat right on our city ARES group's preferred 2-meter simplex channel, and prevented my city EC from using that channel from his condo. Snooping around with a spectrum analyzer and a hand-held beam pinpointed the source as his neighbor's condo (second floor, in the back). This turned out to the location of a Netgear WiFi fouter. The noise seems to have been harmonics from the on-board switching voltage regulator. It was apparently coming out directly from the board itself as RF radiation (through the case) and not as conducted noise on the power-supply cord to the "wall wart" or on the Ethernet cables... those were all adequately choked or filtered. Swapping out the router for a slightly different Netgear model cured the problem... different switching-regulator circuitry, I suppose. - A nasty "buzz" audible on the squelch tails of conversations on several local 2-meter repeaters. The interfering carrier "wandered" across the input frequency range of the repeaters, was strong enough to trigger the repeater receivers' carrier-sense but didn't have a PL tone on it. The source of the signal had been DF'ed and localized to an apartment complex (about 15 miles from one affected repeater!) but the original hypothesis that it was coming from a defective roof-mounted TV antenna preamplifier hadn't panned out. The spectrum-analyzer-and-beam technique identified the specific apartment it was coming from, and the apartment owner volunteered to have us check out his computer system. We confirmed that the pulsing interference signal occurred only when he was downloading content from the Internet. When we unplugged the 10BaseT hub, the interfering signal went away. The noise appears to have been a harmonic of the hub's onboard crystal oscillator frequency... a "fast edge" of the Ethernet clock was somehow being amplified, and leaking out onto the wiring (it seemed to be present on both the 10BaseT cables, on the wall-wart power wiring, and in the AC mains wiring!). Somehow, enough of this signal was being radiated by the building wiring to affect repeaters several miles away! The apartment owner agreed to trade out his defective hub for one I provided from my pile of spares (he got a few extra ports out of the deal), and the problem was gone. So, yes, there are all sorts of ways that a defective network device can emit spurious signals... often in frequency ranges which seem far separated from the equipment's nominal frequencies-of-use. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
#6
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On Wed, 1 Dec 2010 08:32:21 EST, Andy wrote:
wait untill you get one of the new smart meters ![]() from youre power company Not familiar with those, what are they and how/where do they cause RFI? -- Henry Pizzinger Institution for the Mentally 31337 AzzMazta, Chairman & CEO www.xcopfly.com |
#7
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In Bert Hyman
wrote: My Actiontec GT701-WG router pretty much obliterates the 17m band when its radio is active. Before people go any farther in trying to diagnose the problem, let me tell everyone that the problem was fixed quite some time ago. That post was originally made in June 2008 and never made it to the newsgroup, but was somehow just resurrected from somewhere. I repeated the post over in rec.radio.amateur.equipment Message-ID: where I finally nailed it down to a bad wall wart. Sorry for the distraction. -- Bert Hyman W0RSB St. Paul, MN |
#8
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they trasmit on the 2Ghz band and they use NON inonazing wireless signals.
havent tried listeing on its band yet to see what it might do. herd it causes problems with some radios ect. -- AL'S COMPUTERS "AzzMazta" wrote in message ... On Wed, 1 Dec 2010 08:32:21 EST, Andy wrote: wait untill you get one of the new smart meters ![]() from youre power company Not familiar with those, what are they and how/where do they cause RFI? -- Henry Pizzinger Institution for the Mentally 31337 AzzMazta, Chairman & CEO www.xcopfly.com |
#9
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On 12/1/2010 2:59 PM, AzzMazta wrote:
On Wed, 1 Dec 2010 08:32:21 EST, Andy wrote: wait untill you get one of the new smart meters ![]() from youre power company Not familiar with those, what are they and how/where do they cause RFI? They too are computer based so the potential for RFI is greatly increased. But they are easier to read, Some of them can be read remotely using methods somewhat related to BPL (though it is low speed, not broad band) |
#10
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On 12/1/2010 3:00 PM, Bert Hyman wrote:
In Bert Hyman wrote: My Actiontec GT701-WG router pretty much obliterates the 17m band when its radio is active. Before people go any farther in trying to diagnose the problem, let me tell everyone that the problem was fixed quite some time ago. That post was originally made in June 2008 and never made it to the newsgroup, but was somehow just resurrected from somewhere. I repeated the post over in rec.radio.amateur.equipment where I finally nailed it down to a bad wall wart. Sorry for the distraction. It is still a good discussion.. I assume he fixed it by replacing the router. This is stuff we need to know about cause though in this case it was a specific make/model.. Next time it might be a different make/model. |
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