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The tuned circuit of an oscillator in a ...

The tuned circuit of an oscillator in a simple `AM` transimitter employs a `250` micro henry coil and `1 nf` condenser. If the oscillartor output is modulated by audio frequency upto `10KHz`, the frequency range occupied by the side bands in `KHz` is

A

`210` to `230`

B

`258` to `278`

C

`308` to `328`

D

`118` to `128`

Text Solution

Verified by Experts

The correct Answer is:
C
`f_(c)=(1)/(2pisqrt(LC))=318 khz`, `f_(m)=10khz`
`LSB=f_(c)-f_(m)=308`
`USB=f_(c)+f_(m)=328`
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The tuned circuit the Oscillator in a simple AM transmitter employs a 50mu H coil and a 1 nF capacitor. If the oscillator output is modulated by audio frequencies up to 10m kHz calculate the range occupied by the side bands.

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Knowledge Check

  • The tuned circuit of an oscillator in a simple AM transimitter employs a 40muH coil and 12 nanofarad ( nF ) capacitor. If the oscillator ouput os modulated by audio frequency of 5 kHz , which of the following frequencies doesn't appear in the output AM ?

    A
    `f_(USB)=225 KHz`
    B
    `f_(USB)=235 kHz`
    C
    `f_(c)=230 kHz`
    D
    `f_(c)=235 kHz`

  • A 1000 kHz carrier is modulated with 800 Hz audio signals. What are the frequencies of first pair of side bands:

    A
    1000.8 kHz, 999.2 kHz
    B
    999.2 kHz, 998.4 kHz
    C
    1001.6 kHz, 1000.8 kHz
    D
    1000 kHz, 800 Hz

  • A 3000 kHz carrier is modulated with 500 Hz audio signals. The frequencies of first pair of side bands are

    A
    3500 kHz and 2500 Hz
    B
    500 Hz and 2500 kHz
    C
    3000.5 kHz and 2999 . 5 kHz
    D
    2000 . 6 kHz and 2000 kHz

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