Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / muhammed abdhul rehman
Modulation is needed becuase of 3 reasons.
1.Low frequency signals are more immune to noise. So the
low frequency information signal should be mix up with high
frequency carrier to reduce noise affection
2.All sounds are with in the range from 20 Hz to 20 kHz. If
we send audio signal directly all signals from different
sources would be inseperably mixup.So it is necessary to
convert the information signal to different portions of the
electromagnetic spectrum
3.For efficient transmission and reception of Electro-
maganenic waves the Transmitting and Receiving antennas
should have lenths comparable to a quarter-wavelength of
the frequency used. This is 75 meters (75 m) at 1 magahertz
(1 MHz), but at 15 kHz it has incrased to 5000 m (5 Kilo
meter). A vertical antenna of this size is impracticable.
Because of above reasons modulation is needed for
transmitting Electro-magnetic Waves.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
Write down the characteristics of digital ics?
What are the maintenances of a DCS ?
What is pulse width modulation?
numerical on PCM.
Explain the bit format of flag register in 8086.
hi sir i completed my b tech in ece in 2009 and i am interested in railway jobs and plz provide me with what type of questions will they ask along with model paper and my mail id is vaseem_basha@yahoo.co.in plzzzzzzzzzzzzzzz
What is TA? Why do we need TA?
box1-a box2--a box3-a-1 in 3steps using any operation get a*(a-1)-(a-1)*a in box2
I heard that Apple's laptop usese micro controler whereas others use microprocessors... i learnt tat.. micro controller is nothing but an association of microprocesor with other elements like temperature sensor,timer etc...can anyone explain me this much more in simpler words...
how a log ratio amplifier works?
I have Completed my diploma in Electronics in year 2009.I got low score in TOEFL.SO what should i do to get the visa...I am confident that I will get the visa..But probable chances for getting visa....and i also got I20 and paid Visa interview fees.....
What is the duty cycle in on-off control method?
13. How many TRX are supported when we use one M2HA card in BTS? 14. Name the different types of power supply card in BTS and the output power of each card
the industires choose embedded system for their applications because of reverse engg is not possible is the only reason or other reasons are available
Explain the use of excitation table in digital electronics?
