Which frequency range is suitable for sky wave propagation?

  • A
    $1 \text{ kHz}$ to $500 \text{ kHz}$
  • B
    $2 \text{ MHz}$ to $20 \text{ MHz}$
  • C
    $2 \text{ MHz}$ to $2 \text{ GHz}$
  • D
    Above $30 \text{ MHz}$

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Similar Questions

In $AM$ modulation,a signal is modulated on a carrier wave such that maximum and minimum amplitude are found to be $6\,V$ and $2\,V$ respectively. The modulation index is $\dots \%$.

The height of the transmitting antenna is $180\,m$ and the height of the receiving antenna is $245\,m$. The maximum distance between them for satisfactory communication in line of sight will be .......... $km$ (given $R = 6400\,km$).

Which one of the following is not classified as pulse modulation?

In amplitude modulation,the amplitude of the carrier wave is $A_c$ and that of the modulating signal is $A_m$. In practice,the ratio of $A_m$ to $A_c$ is kept less than or equal to $1$ to avoid:

Frequencies in the $UHF$ range normally propagate by means of:

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