Sunday 3 July 2011

Difference between wideband frequency modulation and narrowband frequency modulation.

WIDEBAND FM:
Parameters :
1. modulation index : Greater than 1
2. maximum deviation: 75 kHz
3. range of modulating frequency: 30 Hz to 15 kHz
4. maximum modulation index: 5 to 2500
5. bandwidth : large,about 15 times higher than BW of narrowband FM
6. applications : entertainment broadcasting
7. pre-emphasis and de-emphasis : is needed.

NARROWBAND FM:
parameters :
1.modulation index: less than or slightly greater than 1
2. maximum deviation: 5kHz
3. range of modulating frequency : 30 Hz to 3 kHz
4. maximum modulation index : slightly greater than 1
5. bandwidth : small.approximately same as that of AM
6. applications: FM mobile communication like police wireless,ambulance etc
7. pre-emphasis and de-emphasis : is needed.






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6 comments:

  1. sachin456726 June 2014 at 12:51

    Saala sab kennedy se chhapa hain....

    ReplyDelete
  2. Unknown15 January 2015 at 21:55

    Thanks

    ReplyDelete
  3. Unknown24 October 2016 at 00:34

    Q.2 An information signal with frequency range 25 Hz to 15000 Hz and peak-to-

    peak amplitude of 2.5 volts is to be sent on a carrier with frequency 1000 KHz

    and peak amplitude 5 volts. Following techniques are available:

    A. DSB-FC

    B. DSB-SC

    C. SSB-SC

    D. FM with deviation 500 Hz

    Which technique is better if following parameter is used for the selection of

    the modulation technique? Justify your answer with necessary calculations,

    diagrams, graphs, tables.

    I. Signal Bandwidth

    II. Efficiency

    III. Multi-path Fading

    IV. Circuit Complexity

    V. Output Power

    VI. Noise Immunity

    ReplyDelete
  4. Muhammed Nabeel6 March 2017 at 20:34

    കൊള്ളാട മുത്തേ

    ReplyDelete
  5. Unknown11 December 2019 at 22:48

    The answers are very helpful. Being an Engineering Student I will suggest to follow this sight for proper answers

    ReplyDelete
  6. Unknown11 December 2019 at 22:49

    The answers are very helpful. Being an Engineering Student I will suggest to follow this sight for proper answers . Sayani Banik

    ReplyDelete

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