Answer / ankit kankane

because of air attenuation , the RX level is -ve .

we know
P(dbm)= 10 +10 log p(w)

o dbm = 1 mW
-10 dbm= 0.1 mw
-20 dbm =0.01 mw

normally GSM 900 , 1800 we transmit RF in Antenna ,power = 20 to 25 W
depending on Cell sector,

& we receive only <0.01 mw because of AIR attenuation and other external attenuation , we always get the receiving(Mobile set) singal in '-ve' dbm .

Answer / cnu

- 48 volts. This -48 volts is required by the copper wires to
prevent it from corroded & eluded.

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