my NIC signal get interference from other NIC?

[picard]

Is it possible for my wireless NIC signal weaken due to interference from signals from other NIC in other apartments?

I noticed that my D-link wireless manager detect multiple signals from other users in the building. my signal fluctuate over time during the day.

[Zytek_Fan]

NIC signals are susceptible to other types of signals.
As long as your NIC is defaulted for your router, then there shouldn't be any problems.
Try removing the other routers from your list.

[Serra]

As long as your NIC is defaulted for your router, then there shouldn't be any problems.
Try removing the other routers from your list.

What?

Yes, wireless devices are susceptible to interference. The more wireless devices around you that share the same band, the worse it will be. Ideally, everyone would use bands 1, 6, or 11... because those are the 3 non-overlapping bands, and then we'd all have a better chance of finding a band with little/no interference, but that's not always possible. Your best bet is to check out what bands are currently being used around you and then set your AP to use a different band. For example, if everyone around is using bands 2, 4, 1, 5, 6, 3,8... go for band 11, because it sees the least interference (only band 8 of the ones listed would interfere). In a truly ideal case, the hardware you are using can be flashed or has a hack out for it to enable band 14, which is only legal in Japan and thus does not see much in the way of interference here in NA... of course, that would break FCC rules so clearly you shouldn't do it

[picard]

What?

Yes, wireless devices are susceptible to interference. The more wireless devices around you that share the same band, the worse it will be. Ideally, everyone would use bands 1, 6, or 11... because those are the 3 non-overlapping bands, and then we'd all have a better chance of finding a band with little/no interference, but that's not always possible. Your best bet is to check out what bands are currently being used around you and then set your AP to use a different band. For example, if everyone around is using bands 2, 4, 1, 5, 6, 3,8... go for band 11, because it sees the least interference (only band 8 of the ones listed would interfere). In a truly ideal case, the hardware you are using can be flashed or has a hack out for it to enable band 14, which is only legal in Japan and thus does not see much in the way of interference here in NA... of course, that would break FCC rules so clearly you shouldn't do it

how the heck can I add channels above 11? My connection manager detect other wireless signals in the building. I can't adjust my router to tune them out.

[affiliate13]

How Close is your PC to your router?

what is in between, cordless phones, TV-Video senders anything like that?

i think you already started a thread on this, there was some help in that, i guess it wasnt eneough but you can use directional tools on both the router and NIC aerial to filter your signals out from everone elses.

yagi type aerials are best
http://www.skunkworx.co.uk/page8.html
http://wireless.navigator.co.uk/aerial_types.htm

this is probably overkill though. is you router a MIMO unit?

[Serra]

how the heck can I add channels above 11? My connection manager detect other wireless signals in the building. I can't adjust my router to tune them out.

Hacking your device depends on your device... it's not available on every setup. As far as tuning out other signals... yeah, I have no idea what the other poster was talking about.

If there aren't any walls or things, you could even look at using an 802.11A-based solution if you don't mind replacing hardware... you can get speed the same as G, but it's not as popular because it does notably worse with things like walls.

[MentholMoose]

With 802.11b/g, the channels overlap. From here:

So, find out what channels your neighbors are using, and set your router to the channel with the least interference (see Serra's example). However, the proliferation of 802.11b/g devices will probably mean that you cannot find a channel that won't have interference from another device.

Some channels are available in the EU, Japan, and Australia, that are unavailable in North America: 12, 13, and 14 (Japan-only). If you want to enable these, check if international firmware is available for your router. There might also be an option for you to choose your country in your current firmware; for example, the 3Com AP I use will prompt for the country on the initial setup.

Upgrading the antenna might help. If you're using a laptop, you probably cannot (easily) upgrade its antenna, but you might be able to do so on your router/AP. If you want to improve the signal throughout your apartment, a yagi is probably too directional. Look for an antenna that has a wider beam width, such as a panel antenna. A cheap omni-directional antenna might still provide some benefit, though.

Also consider switching to 802.11a hardware, if your existing equipment doesn't support it already. The channels are non-overlapping, and devices using this standard is not very popular, so you probably won't have to worry about interference from other 802.11a devices. I set my AP to use 802.11a, and there are no other 802.11a devices in my area (compared to about a dozen 802.11b/g devices that my laptop wireless NIC detects).

Good luck.