Answer / nirmal

yes , digital signal can send in air with out modulation .
but it is for very small distance . (baseband modulation ).
to increase the distance to be covered , power of
transmitters should be very high .
digital signal is always a pcm signal so it is already
modulated. but no avialability of carrier it is used for
wired communication . for larger distance digital
modulation is used. so digital modulation is called double
modulation.

which opamp don’t have feedback loop?

0 Answers  

---

I want previous rrb enteranse exam papers in junior engineer(Signal/Tele/c&w). please send that papers to my id dkg_unnao@yahoo.com

0 Answers   RRB,

---

working of tuch screen pannel

0 Answers   Videocon,

---

why digital signals are preferred over analog in com?

7 Answers  

---

What are the types of commutation? (Or) turn off methods?

0 Answers  

---

What is the necessity to use the special machines?

0 Answers  

---

What is the relation between current and voltage?

13 Answers  

---

what do u understand by telecommunication?

2 Answers  

---

What is dvm?

1 Answers   Dev Institute,

---

What are digital electronic flip flops, state the different types of flip flop and their uses?

0 Answers  

---

Explain the structure of entire GSM.

0 Answers   NSN,

---

Which is better in VLSI-NAND or NOR implementation? why?

3 Answers  

---