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.

Define what is meant by filter?

0 Answers  

---

Define buck boost converter.

0 Answers  

---

Define what is its magnitude for ge and si?

0 Answers  

---

can we conect lowpass filter before high pass filter in cascade form in band pass filter?(active filter).

0 Answers  

---

What is a multiplexer?

13 Answers  

---

---

I want previous rrb enteranse exam papers in section engineer. please send that papers to my id rohit_nist@yahoo.co.in

0 Answers  

---

WHERE MODERN TECHNOLOGY USEING IN STEEL INDUSTRY.AND WHAT IS THE NAME OF THE TECHNOLOGY

2 Answers   TATA, Vizag Steel,

---

How video signals are produced?

0 Answers  

---

How many RRI we can use in One BTS?

0 Answers   NSN,

---

Define interfacing?

0 Answers  

---

what is the role of electronics,communication engg. in IT industry?

0 Answers   Wipro,

---

what is pulse logic system?

0 Answers  

---