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Where did you put the range expander? Is it on the laptop side of the wall or in the other side? Wireless range normally is only good if the two points are in line of sight. A wall immensly decreases the signal. If you have direct line of sight the range can be anywhere between 300 and 800 m. A wall with iron inside usually completely cuts off the signal, even if the distance is only 5 m! You might be able to improve the signal by testing different locations for the expander.
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Where did you put the range expander? Is it on the laptop side of the wall or in the other side? Wireless range normally is only good if the two points are in line of sight. A wall immensly decreases the signal. If you have direct line of sight the range can be anywhere between 300 and 800 m. A wall with iron inside usually completely cuts off the signal, even if the distance is only 5 m! You might be able to improve the signal by testing different locations for the expander.

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Okay... I have a system setup with D-Link Wireless Router and two computers wired to that router. &nbsp;I have a laptop wireless connected to the router. &nbsp;The distance between the wireless router and the laptop is about 40 feet with a concrete wall separating them. &nbsp;Also, between the laptop and the router I have a D-Link Range Expander. &nbsp;I am not using WEP. &nbsp;I am using MAC filtering. &nbsp;The Dell laptop has a built-in wireless card and is the only hardware component that doesn't match the other D-Link hardware. &nbsp;I cannot get a consistent high quality wireless signal to the laptop. &nbsp;It is strong than weak. &nbsp;Sometimes the signal is so week it seems as if I am using dial-up on the Internet. &nbsp;Any suggestions?
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Okay... I have a system setup with D-Link Wireless Router and two computers wired to that router.  I have a laptop wireless connected to the router.  The distance between the wireless router and the laptop is about 40 feet with a concrete wall separating them.  Also, between the laptop and the router I have a D-Link Range Expander.  I am not using WEP.  I am using MAC filtering.  The Dell laptop has a built-in wireless card and is the only hardware component that doesn't match the other D-Link hardware.  I cannot get a consistent high quality wireless signal to the laptop.  It is strong than weak.  Sometimes the signal is so week it seems as if I am using dial-up on the Internet.  Any suggestions?

Wireless Signal problems/degradation

Wireless networking is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Wireless telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure. The key hardware components of a wireless computer network include adapters, routers and access points, antennas and repeaters.