What is VSWR? what are waveguides and their types. What is
Aloha? Shannon's information capacity theorem, Sampling
theorem, antenna gain, types of antennae, GSM/CDMA
comparison, modulation techniques, Superheterodyne receiver
Answers were Sorted based on User's Feedback
Answer / jeyalakshmi
Voltage standing wave ratio
ALOHA is a old ethernet or networking protocol
sampling theorem:fs> 2fmax
G=4piD/lambda square
modulation tech:AM,FM,PM,QPSK,QAM,OFDM..
superheterodyne Reciever:its freq converter...or a frequency
synthesizer ckt for conversion of frequencies
Is This Answer Correct ? | 14 Yes | 0 No |
Answer / gayathri
voltage standing wave ratio=(1-load impedance/1+load impedance).these are observed when ever we terminate the load with some impedance.
ALOHA is the older network protocal..
SHANONS CAPACITY THEOREM---- c>=r
i.e.,,,, cimplies channel capacity,r implies rate of transmission. these constraints have to be maintained... c=b log(1+s/n) it gives channel capacity....
sampling theorem:- sampling frequency should be greaterthan or equal to the message signal frequency.
ANTENA GAIN :- 4pid/lambda^2 i.e., d implies directivity, lambda for wavelength asociated to it....
types of antennas:---- horn antenna,array antena,uni directional, omnidirectional, bi directional antennas....
gsm stands for global synchronisation for mobile communication.here we cant have acces to change our network where as cdma stands for code division multiple access....
modulation techniques:- am,pm,fm, are analog modulation techniques,pcm,dpcm,dm,adm are digital modulation techniques.....
super hetrodyne receivers:--- these are the high frequency receivers having band width of 200 kHZ And intermediate frequency range of 10.7MHZ.
Is This Answer Correct ? | 0 Yes | 0 No |
Suppose if there is the level of impurity in p-type & n-type semiconductor of pn junction diode is different then what effect on depletion?
Hi and my regards to whomsoever who will help me. I am going to appear for Airport Authority of India Manager ( Electronics) written test on 9th Now 2008. I am totally unaware about this test. Please any one who have got any idea for its Paper style or have got any of related model papers then please please help me out. I will be thankful to all of you a lot.
0 Answers AAI Airports Authority Of India,
The potential energy of a charged conductor is
hello friends actually friends i took admission in us university i have not given toefl and gre is it possible for me to get visa actually once i gave a toefl test my score is 56 after that i m not taken again...please guys gave me some ideas what i do ..... i have already a i20 of us uni. my interview is on next month
What principle does a q-meter operate?
what is OpenBTS?
What is the GSM fundamental?
What is hard switching of the thyristor?
Write down the characteristics of digital ics?
define drain resistance
please send me last five year papers for my electronic and communication branch as i have completed my graduation in diploma.
whan type of controller is used in power plant?