Posts
baby monitor wifi image
I dont kno
I have 2.4 ghz spread spectrum cordless phone that autoselects the clearest channel everytime you use the phone and there is no way to change the channel manually. I also have a linksys 2.4 ghz wireless router. Using the cordless phone renders my wifi useless 9 times out of 10. I have tried to change the routers wireless channel (possible values are 1-11 I think) but that did not solve the problem. Does anyone know what I can do to prevent this interference?
Answer
Each device uses the same frequency band (as do garage door openers, baby monitors, Web cams, ....).
You can change frequency bands for one or the other. Use a 5Mhz phone, or a 5MHz band WiFi gear (802.11a).
Reduce the relative signal strength seen by the 802.11b/g stuff you've got. Move the phone to the other end of the house. Move the laptop (or whatever) closer, leaving the phone in the same place, ... Add an antenna (probably a corner reflector (chicken wire may be a perfectly sensible material) for the rubber ducky type of antenna design most commonly seen) to both ends of the WiFi link (you may not have to physically crack open the radios at either end, but note that this dodge increases signal strenght in one direction (and does the same to receiver sensitivity). Since both the phone handset(s) and the mobile WiFi device (a laptop, probably) is also mobile, this isn't any kind of universally adequate dodge. Find a way to reduce the phone's signal strength (probably not possible to non-techie types) unless it's possible to say, put soeme absorbing or reflecting material between the phone and the WIFi radios. An experimental bronze foil covered wall, perhaps. Ought to work well if you can keep the two radio types out of each other's effective range. May not be possible in some kinds of interior decorating environments. consult with those in charge before trying anything like this.
Another dodge ito try to arrange that the WiFi antennas are a 90 degree polarizatino difference than the phone antennas (as usually used; if you have sprawling teenagers, this may not be predictable).
Since both devices operate (or probably do) in a spread spectrum mode, each will appear to the other to be a general increase in the noise level against which they must work. Changing channels (if possible) isn't likely to be very effective. Too much noise, no radio receiver will be able to make sense of what it hears.
Each device uses the same frequency band (as do garage door openers, baby monitors, Web cams, ....).
You can change frequency bands for one or the other. Use a 5Mhz phone, or a 5MHz band WiFi gear (802.11a).
Reduce the relative signal strength seen by the 802.11b/g stuff you've got. Move the phone to the other end of the house. Move the laptop (or whatever) closer, leaving the phone in the same place, ... Add an antenna (probably a corner reflector (chicken wire may be a perfectly sensible material) for the rubber ducky type of antenna design most commonly seen) to both ends of the WiFi link (you may not have to physically crack open the radios at either end, but note that this dodge increases signal strenght in one direction (and does the same to receiver sensitivity). Since both the phone handset(s) and the mobile WiFi device (a laptop, probably) is also mobile, this isn't any kind of universally adequate dodge. Find a way to reduce the phone's signal strength (probably not possible to non-techie types) unless it's possible to say, put soeme absorbing or reflecting material between the phone and the WIFi radios. An experimental bronze foil covered wall, perhaps. Ought to work well if you can keep the two radio types out of each other's effective range. May not be possible in some kinds of interior decorating environments. consult with those in charge before trying anything like this.
Another dodge ito try to arrange that the WiFi antennas are a 90 degree polarizatino difference than the phone antennas (as usually used; if you have sprawling teenagers, this may not be predictable).
Since both devices operate (or probably do) in a spread spectrum mode, each will appear to the other to be a general increase in the noise level against which they must work. Changing channels (if possible) isn't likely to be very effective. Too much noise, no radio receiver will be able to make sense of what it hears.
Is there a way to detect if someone is using a wifi jammer?
Reprobate
My internet has been out for three weeks. There have been brief periods when it's working 100% on all devices. I've changed routers three times - same problem with each one. Cable provider has been out - they say all good on their end. I had the Geek Squad out too, but they arrived during one of those brief periods when everything was working.
Could someone be jamming my wifi? I just Googled wifi jammers and apparently they exist because I came across a web page that sells them.
Is there a way to detect if someone's using one in my area?
Answer
You can download an application called a WiFi Sniffer. This will show you all the wireless networks available in your area, and include more detailed information than your OS will tell you. I've used NetStumbler and Xirrus WiFi Inspector. They should tell you what network you are connected to and what channel your router is on. Next look to see if there are any other networks in the area on the same channel. If so, you could be experiencing co-channel interference. This happens when wireless devices (such as router and access points) are in the same area and operate on the same channel. Change your channel to lesser used channel (1,6, or 11) with a weaker signal. If your devices support 5 GHz, you might also try that.
Also, there are other devices that operate in same frequency band as most WiFi devices. These include microwave ovens, cordless phone, and baby monitors. The Sniffers only work with WiFi devices, it won't tell you about nonWiFi interference sources. There is hardware and software that will do that, but it has a high price tag.
I doubt someone has a WiFi jammer. If they did, its possibly illegal (subject to local laws). In the US, the 2.4 GHz range is unlicensed, and while a device operating on that frequency IS required to accept any signal, you may NOT operate a device with intention of causing interference. If I had to bet, its interference from nearby sources, check the WiFi scanners I suggested.
You can download an application called a WiFi Sniffer. This will show you all the wireless networks available in your area, and include more detailed information than your OS will tell you. I've used NetStumbler and Xirrus WiFi Inspector. They should tell you what network you are connected to and what channel your router is on. Next look to see if there are any other networks in the area on the same channel. If so, you could be experiencing co-channel interference. This happens when wireless devices (such as router and access points) are in the same area and operate on the same channel. Change your channel to lesser used channel (1,6, or 11) with a weaker signal. If your devices support 5 GHz, you might also try that.
Also, there are other devices that operate in same frequency band as most WiFi devices. These include microwave ovens, cordless phone, and baby monitors. The Sniffers only work with WiFi devices, it won't tell you about nonWiFi interference sources. There is hardware and software that will do that, but it has a high price tag.
I doubt someone has a WiFi jammer. If they did, its possibly illegal (subject to local laws). In the US, the 2.4 GHz range is unlicensed, and while a device operating on that frequency IS required to accept any signal, you may NOT operate a device with intention of causing interference. If I had to bet, its interference from nearby sources, check the WiFi scanners I suggested.
Powered by Yahoo! Answers
No comments:
Post a Comment