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.

Explain capacitance, inductance, resistance.

0 Answers  

---

Tell me what is the max. Or min . Value of tv in msa to calculate r&r?

0 Answers  

---

WHAT IS VSE?

2 Answers  

---

State the differences between fir and iir filters?

0 Answers  

---

how can I pass ccna in first try in one month

0 Answers  

---

What is the difference between emulator and simulator?

0 Answers  

---

tell me about favourie colour?

1 Answers   IBM, TCS,

---

What are the parts of network management system (nms)?

0 Answers  

---

if my one vlan in chennai and other vlan is in Hyderabad then how this two vlan can communicate

1 Answers   Reliance,

---

Please i would like to know what is the process to add now tapes in ATL. How should i inicialize them?

0 Answers  

---

3-4 ques of instrumentation : data based.

0 Answers   ONGC,

---

what are advantages of dc over ac supply?

5 Answers   Ecil, TCS,

---