Tag: elements of communication system

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Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

To double the covering range of a TV transmission tower, its height should be multiplied by :

  1. 2

  2. 4
  3. $

    \sqrt{2}

    $
  4. $

    \frac{1}{\sqrt{2}}

    $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The maximum line of sight range d of a TV transmission antenna is proportional to the square root of its height h, expressed as d = sqrt(2R h). To double the range d, the new range must be 2d, which requires multiplying the height by a factor of 4 since sqrt(4h) = 2 sqrt(h).

Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot ?

  1. 2250 kHz

  2. 2900 kHz

  3. 2750 kHz

  4. 2000 kHz
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As calculated previously, the carrier frequency is 2500 kHz. The next available channel for an AM station would be 2500 kHz + 250 kHz = 2750 kHz.