[ns] how to modify bandwidth in wireless nodes

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ns-users£¬

   I am a new user in NS2,Now I want to modify bandwidth in my simulation in wireless nodes.How can I do that?

Maybe I try to modify ns-default.tcl,where I find below:

Phy/WirelessPhy set bandwidth_ 2e6

I modify it to Phy/WirelessPhy set bandwidth_ 19.2e3,but any change occur,what is wrong with me,any advise is appreciated

     thanks a lot for every person-:)

2006-4-2