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.

any from electronics proffesional i want to generate 12v automotive voltage regulator in the latest technology plz provide me some technical notes on it.

0 Answers  

---

Define holding current?

0 Answers  

---

Why cannot we use leds for rectification purpose?

0 Answers  

---

Explain the use of fbus protocol?

0 Answers  

---

If we have 450 mm height boiler drum level, so what is span & zero value for a dpt transmitter?

0 Answers  

---

What the types of breaking systems in circuit breakers? Why we use CT with fuse in series trip circuit breaker(HT), though we don't use fuse normally in CT output?

0 Answers   HAL,

---

Two initially identical samples A and B of pure germanium are doped with donors to concentrations of 1*10, 20 m-3 and 3*10, 20 m-3 respectively. If the hole concentration in A is 9*10 12 m-3, then the hole concentration in B at the same temperature will be

0 Answers   C DAC, CDAC,

---

How to increase the gain and directivity of an antenna?

0 Answers  

---

What are the charge carriers in p-type and n-type semiconductors?

0 Answers  

---

what your doing work capacity?

1 Answers   Denso,

---

What is the maximal decimal number that can be accommodated in a byte? a) 128 b) 256 c) 255 d) 512

5 Answers   BSNL,

---

what is the maximum delay gnerated by 555timer and why?

0 Answers  

---