Search results

Search Forums New Posts
  1. prateeksikka

    FM WAVE PROPAGATION

    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...
  2. prateeksikka

    FM WAVE PROPAGATION

    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
  3. prateeksikka

    FM WAVE PROPAGATION

    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...
  4. prateeksikka

    FM WAVE PROPAGATION

    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?
  5. prateeksikka

    FM WAVE PROPAGATION

    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?
  6. prateeksikka

    FM WAVE PROPAGATION

    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...
  7. prateeksikka

    AM RECIEVER

    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...
  8. prateeksikka

    Electronic Stethoscope 2

    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...
  9. prateeksikka

    Electronic Stethoscope 2

    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...
  10. prateeksikka

    Electronic Stethoscope

    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...
  11. prateeksikka

    Electronic Stethoscope

    hi audioguru! there's a bad news.this new circuit gives excellent results on orcad simulation(as desired)but when i made the circuit,it produces a very weak signal at o/p which i thought to be battery noise,what do u have to say? prateek
  12. prateeksikka

    Electronic Stethoscope

    dear sir; i know that it wont give a perfect d.c voltage at the o/p.but if we see the actual doctor's non electronic stethoscope,there we do not see any a.m wave kind of thing.do you mean to say that doctor actually listensto electrical signal corresponding to an a.m wave? i have tried both...
  13. prateeksikka

    Electronic Stethoscope

    i simulated this ckt of stethoscope on circuit maker and orcad latest edition .both gave amplitude modulated kind envelope at o/p.please help /comment on this
  14. prateeksikka

    Electronic Stethoscope

    hi every body, i have spend 3 precious months of my college life working on this project of electronic stethoscope.i made it thrice with one of my friend's help but could not hear anything other than humming noise in the speakers.soldering is perfectly alright.when i tried to trouble shoot it...
View older results
Top