Problems with wireless connection between new macbook and older imac

I have just bought a 2.0 ghz macbook core2duo and am unable to connect to my wireless internet network at home. My wireless connection is set up through the airport card in my 17" flat panel imac (i.e. I am using the imac as the internet base station). I had an old clam shell macbook (which just died hence the new macbook) and still have a 400 mhz graphite SE iMac which both connec(ed) to the network perfectly for years. But the new macbook will not connect. It will connect when connected via ethernet. The imac uses Tiger.
I have tried resetting the name of the network, using encryption and not using encryption, but nothing helps. The macbook appears to see the network (although no bars register in the airport connection icon) but I always get an error message when trying to connect.
Does anyone have any ideas?
Thanks

I am not actually using a router as I am using the airport card (non express i believe) in my iMac to send the wireless signal. My modem is Motorola but not sure which model. I have Comcast cable internet service
Nick

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