[ns] Transmitting power for Wavelan

[Claude Chaudet <Claude.Chaudet@free.fr>]

Hello,

I am trying to modelize the last Orinoco Wavelan wireless card and I 
don't know how
to compute transmitting power. In the specifications of the card, the 
transmitting
power is expressed in dbm (it is 15 dbm). How to convert this in Watts ?

In wireless_phy.cc, there is a few lines which say :
	// Assume AT&T's Wavelan PCMCIA card -- Chalermek
	//  Pt_ = 8.5872e-4; // For 40m transmission range.
	//  Pt_ = 7.214e-3;  // For 100m transmission range.
	//  Pt_ = 0.2818; // For 250m transmission range.
	//  Pt_ = pow(10, 2.45) * 1e-3;         // 24.5 dbm, ~ 281.8mw

What is the real formula ? If I use Pt_ = pow(10, 1.5)*1e-3, what is 
the corresponding
transmission range ?

Thanks

Claude Chaudet.
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