Very low signal strength when using DLINK 2640t with mac mini

i have a mac mini and i have been using it fine with a 2wire wireless modem. However i have just switched to a Dlink 2640t (54Mbps (802.11g) Wireless ADSL 2/2+ Router with Built-in Modem, 4-port 10/100Mbps Switch) and have been getting very low signal strengths on my mac mini, resulting in me not being able to surf the internet. The modem+ router is located in the next room. Does anyone know whether its the problem with the modem router or mac mini's airport wireless problems with the router itself. It worked perfectly fine with my previous 2wire wireless modem
please help!

Did you reset the router after you updated router's firmware? Its always recommended to perform a reset after firmware upgrade on the router.
Please refer to the link http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=eaa3127db5f4402584c959a7251e754c_4008.xml&pid=80&r...
For wireless range and signal issues, try changing the channel on the router to either 1,6,9 or 11.
Please refer to this link on changing wireless channel and SSID (network name)
http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=a0fb6c64337e47eb9e3e1027f364e70c_154.xml&pid=80&re...

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