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prateeksikka
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Posts posted by prateeksikka
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be careful to use the statement outport address once and inport statement twice to handle the problem of repeated readings in quick basic(a serious flaw in qb not C)
PRATEEK -
hi audioguru!
very less interference at very high frequencies.microscopic pocket antenna to transmit,what else do we desire?wat is the problem at such high frequencies?can we expect our radio services to run at few Ghz in near future?
prateek -
hi alun and audioguru!
can i conclude that high frequency waves dont travel far because they mostly travel line of sight but have the advantage of low noise over loe frequency signal??????????plz reply
prateek -
AUDIOGURU!
IF I HAVE 5mV SIGNAL (AMPLITUDE) AND I TRANSMIT IT AT 2 FREQUENCIES SAY 100Hz and 2Ghz .do u think that the two will be equally affected by noise?if not,which one is affected more?
if noise effect is independent of frequency we could not be fighting for and paying huge bucks for purchasing bandwdth.
prateek sikka -
IS IT ALSO POSSIBLE TO CONTROL BRIGHTNESS OF BOTH BULBS BUT IN A VARIABLE MANNER RATHER THAN CONNECTING ALL 3 IN SERIES?
PRATEEK -
hi audioguru!
i have read that the world today is craving for bandwidth. thats why we are constantly moving towards higher end of spectrum just like GHz range in satellite communication. But it comes with a disadvantage that higher frequencaties are more prone to noise.is it true that high frequency means high distortion? if yes then why is it not applicable to high frequency F.M over low frequency A.M?
(ANYBODY MAY HELP ME!!!!)
PRATEEK -
audioguru!
how do you rate the idea of using low level modulation in this circuit?
in that case we can almost blindly chose the amplifier
prateek -
audioguru!
as far as i know we in india can transmit upto 100 mW in F.M range(88-108)Mhz. how can i ensure that my transmitted power does not exceed 100mW? for frequencies i think that we have to purchase the bandwidth from government.
prateek -
hi audioguru!
i exactly meant the way you thought..Did u have to purchase the frequency used by you from the authority or one is free to chose any frequency at which transmission is done.IN short can i make a transmitter that works at 115 Mhz. well beyond f.m range and that too without permission!!!!!!!????????
prateek -
hi audioguru!
dont u think it will be a good idea to use a band pass filter just before modulator in your modified ckt.if yes pls try it out and let me know the results. can i have the reciever ckt too .how are u testing it?
have u made your own reciever too or r u using conventional f.m reciever..
wat frequency range?
prateek -
HI CHAITANYA,ANTE!
MAY I KNOW THYE APPLICATION OF THIS JAMMER CIRCUIT?
HOW DOES THIS WORK?
PRATEEK -
HEY TRIGGER!
I JUST WANNA KNOW CAN I START MY LOCAL F.M BROADCAST AND TALK TO A PERSON IN NEXT BUILDING?IF YES, HOW SHOULD I PROCEED?
PRATEEK -
hi chaitanya!
my query was why do high frequency waves have such a property and low frequencies have different properties of reflection?
prateek -
most books on electronics communication systems clearly write that F.M waves do undergo more distortion in reflection of the ground than low frequency a.m waves.why is it so?in other words why a.m waves dont travel line of sight and why f.m does?
prateek -
hi audioguru and akki!
i have read the book on"electronic communication systems "by george kennedy and also by "shoenbeck"
all books say the same as audioguru said in his reply to me. that they do reflect(i.e f.m waves do reflect) and it is called multipath distortion.but i again revive to my question then "WHY NOT FROM GROUND AND THUS GROUND WAVE PROPAGATION" OK THEY DO REFLECT FROM STEEL STRUCS AND BUILDINGS BUT WHY NOT FROM GROUND?one book also says that if they reflect off the ground it undergoes destructive interference.can u tell why?
prateek -
hi audioguru and shekhar!
any comments on my question of why high frequencies travel line of sight?why cant waves like f.m waves travel along the ground?is it due to the fact that they cant face multiple reflections.again the question why cant they suffer reflections?
prateek -
hi autir!
i have gone through the link sent by you.i have found it much more benificial in understanding modes of propagation of various electromagnetics.according to the link sent by u,it is the water vapours ion atmosphere which determine the mode of propagation of f.m waves as line of sight.do u really think that it could be water vapours?i m surprised!any explanations supporting this which u would like to quote?i know its not a hardcore electronics question but still................plz help any other reason (open to all)
prateek -
hi autir!
i understand your views but i am actually intrsted in finding the reasons why high freq waves cant do that i.e reflect from ionosphere or ground? -
for kevin particularly::::
but i guess that will also be the case with a.m.because after all a.m waves are also radiated by antennas.so why not go for line of sight in a.m? -
HELLO EVERY BODY
I HAD A THOUGHT IN MY MIND A FEW DAYS BEFORE.I HAD READ TILL NOW THAT F.M WAVES PROPAGATE ALONG LINE OF SIGHT JUST LIKE ANY OTHER VHF SIGNAL.BUT I COULD NOT FIND THAT WHY F.M WAVES CAN NOT TRAVEL ALONG THE GROUND LIKE A.M WAVES?IN OTHER WORDS,WHAT DIFFERENCE DOES IT MAKE WHEN IT COMES TO MODE OF PROPAGATION IN TERMS OF FREQUENCY.PLEASE HELP ME
PRATEEK -
HI EVERY BODY!AFTER MY SUCESSFUL WORK ON THE ASSEMBLY OF AN F.M SUPERHETERODYNE RECIEVER AND ELECTRONIC STETHOSCOPE(WITH HELP FROM ELECTRONICS LAB) I WISH TO WORK ON ASSEMBLY OF AN A.M RECIEVER I.E THE CONVENTIONAL A.M RADIO.A SIMPLEST CIRCUIT ISWHAT I REQUIRE.ANY SUGGESTION OR HELP EVEN WITH F.M OR A.M RECIEVER?AWAITING EARLY REPLY;
PRATEEK -
hi audioguru!
Sorry for wasting your precious time working on this project. I got these ICs from new delhi,india through one of my friends.thanks once again for your cooperation.Now when it is finally over,i wish to ask about you.are u a student?what do you do? where do you live,if you are getting some time out of your professional life,do send me some reply on these questions.
do send me a private message along with your e-mail i.d(if you dont object) thanking you once again and awaiting early reply,
prateek -
hi audioguru!
sorry for the delay in reply i was busy in making this circuit for few days. i have made it using the ics which you recommended. much better response.working well as EMAD said but by using a high power headphone as in a walkman radio.
(i myself used it)
any comments on that. anyway thanks for the corrected circuit.awaiting early reply.
prateek -
hi audioguru;
could you please be specific about these ics i.e tl071 and TL072 as these are not easily awailable in the city where i live(in india) they say that they may have to purchase it from new delhi.any estimate of its cost and availability or for that matter a simpler substitute for it?
thanks
prateek
PIC's
in Electronics chit chat
Posted
PROGRAMMABLE INTERRUPT CONTROLLERS WHICH HANDLE INTERRUPTS
TO A MICROPROCESSOR JUST LIKE RESOLVING PRIORITY ISSUES BETWEEN THEM
PRATEEK