Signal strength dropping.

Over a period of some 12 hours wireless signal strength drops from 15 to 5. On restart it goes back to 15. What is causing this please?

B16JOP-
That is a very good question. If your problem were caused by some external interference I would not expect it to come right back.
This Airport troubleshooting guide may be of some help.
Luck-
-DaddyPaycheck

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Have you gone to your date and time settings and verified that "set automatically" has been checked?
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I'm a longtime fan of Linksys equipment. But my last 2 Linksys routers have been terrible. This one worked great for about 3 weeks then the signal strength dropped so low that you have to be within 10 feet of it to connect most of the time. The signal strength is unstable and will disconnect you in the middle of important downloads. I wasn't able to get into the setup last week and ended up rebuilding it using the software. Today I am unable to get into the setup again. I don't have time to dink around with it and am on my way to the store to buy a different brand. NO MORE CISCO/LINKSYS FOR ME!

Before I suggest you any troubleshooting steps, I would like to ask few questions. Let me know the light status on the router? What is the current IP address on the computer? How frequently does it happen?
All the E series routers come with the great Cisco connect software for the easy installation. Before installing the router, make sure that your Internet is working properly through the modem. Connect your computer directly to the modem and try to go on line.
If you are able to access the Internet from the modem, then your Internet is working properly. Now insert the CD in to the same computer. Do not run the CD on any other computer. Use the same computer that you used to connect to the modem. Follow the steps of the CD. It may not ask you to connect the computer to the router. But it is recommended that you should connect your computer to the router for the initial set up of the router. You will need to connect the computer to one of the Ethernet port on the router and the modem to the Internet port on the router. That means there will be 2 connections to the router. Now go to the next step on the set up CD. It will take up to 5 minutes to set up the router. Definitely you can setup the router without CD also. You just need to open the setup page of the router and change the settings manually.
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1) For the best possible speeds, you need to be using WPA2-AES as your security mode. Any other security mode will see your speed/range capped.
2) Ensure that your router is running the latest firmware from homesupport.cisco.com The new firmware includes performance enhancements and fixes.
3) The router by default uses a channel setting of auto, which means that it would keep switching channels depending on the interference. I’d recommend you set it to a fixed channel. Usually, 1, 3, 6 and 9 give you the best performance depending on your environment of course. I’d suggest you try different channels, observing each for a while, to see which gives you the best performance. You can follow the link here on how to change channels.
Second, please verify that you have got a 802.11n card in your computer. New generation routers (i.e. E4200) speaks an entirely different language with 802.11g cards, so while those adapters can work with the E4200, but they are not optimized to provide good performance. It is like having to translate from one language to another in real time when going from N to G.

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See my FAQ*:
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Check that your clock battery isn't nearing death.
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hello,
recently I have changed from an AirPort basestation to an Airport Extreme basesation.
There are two iBooks (G3 and G4) and a PowerBook G4 using the wireless LAN.
Having now installed the latest (driver) software from Apple my iBook G4 (running on Panther) has four bars signal strength when booting or waking up. But within 20 to 30 seconds the signal strength drops to only two bars in the menu list.
This is strange to me because the PowerBook G4 (running on Tiger) has always four bars even if they are on the same table about 4 meters from the AirPort basestation away. Usually the PowerBook is further away and still has its four bars.
With my old AirPort both computers had always four bars.
Where shall I start searching to solve this?
If the signal drops even to one bar then sometimes the connection to the Internet is very poor (eg I had to click a hyperlink twice to get the page or I will run into a network timeout).
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ueli
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I noticed with my time capsule 2TB that in certain spots in my apartment the signal strength dropped significantly. On my IPhone it went in average down by 2 rings, my iMAC in two rooms away is even loosing sometimes the connection. Does somebody now about this, in case not I think maybe there is an interference, is there a workaround by which I don’t lose speed?
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See this Apple support document for more details and suggestions:
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