We do not transmit low frequency signal to long distances because-

(A) The size of the antenna should be comparable to signal wavelength which is unreal

(B) Effective power radiated by a long wavelength baseband signal would be high.

(C) We want to avoid mixing up signals transmitted by different transmitter simultaneously.

(D) Low frequency signal can be sent to log distances by superimposing with a high frequency wave as well.

Therefore, the most suitable options will be

Option 1 - (A), (B) and (C) are true only

Option 2 - (A) , (C) and (D) are true only

Option 3 - (A), (C) and (D) are true only

Option 4 - (B), (C) and (D) are true only

1 Views|Posted 6 months ago

Asked by Shiksha User

1 Answer

Sort by:

Answered by

Payal Gupta | Contributor-Level 10

6 months ago

Correct Option - 4

Detailed Solution:

For high wavelength, size of antenna should be high.

Upvote

Similar Questions for you

The TV transmission tower at a particular station has a height of 125 m. For doubling the coverage of its range, the height of the tower should be increased by

Vishal Baghel

According to question, we can write

$d = \sqrt[]{2 h R} \Rightarrow \frac{d_{2}}{d_{1}} = \sqrt[]{\frac{h_{2}}{h_{1}}} \Rightarrow h_{2} = {(\frac{d_{2}}{d_{1}})}^{2} h_{1} = {(\frac{2}{1})}^{2} \times 125 = 500 m$

Increment in height of tower = h₂ – h₁ = 500 – 125 = 375 m

A signal containing multiple frequencies is shown in figure A. It is passed through 2 different filters and then outputs are shown in figure B & C.

Vishal Baghel

Low pass filter will allow low frequency signal to pass while high pass filter allow high frequency to pass through

An antenna is mounted on a 400m tall building. What will be the wavelength of signal that can be radiated effectively by the transmission tower upto a range of 44kg?

Vishal Baghel

$λ > h \Rightarrow λ > 400 m$

Vishal Baghel

µ = A? /A? = 0.5 {A? = 20 volt, A? = 40 volt}
m (t) = A? sin ω? t {ω? = 2π×10? }
c (t) = A? sin ω? t {ω? = 2π×10×10³}
C? (t) = (A? + A? sin ω? t) sin ω? t ⇒ A? {1+ µsin ω? t} sin ω? t

For VHF signal broadcasting........ km² of maximum service area will be covered by an antenna tower of height 30m, if the receiving antenna is placed at ground. Let radius of the earth be 6400km. (Round off to the Nearest Integer) (Take π as 3.14)

Vishal Baghel

Kindly consider the following figure