The maximum number of TV signals that can be transmitted along a co-axial cable is

Question

The percentage of the total power carried by the sidebands of the AM wave for tone modulation when the modulation index is 0.3 is:

Answer 1

Step 1: Identify what limits the count.
The number of TV signals a co-axial cable can carry is set by how its total usable bandwidth compares with the bandwidth one TV channel needs.
Step 2: Bandwidth of a co-axial cable.
A typical co-axial cable offers a usable bandwidth of about \[ 750\ \text{MHz}. \]
Step 3: Bandwidth per TV signal.
A single TV channel needs roughly \[ 6\ \text{MHz}. \]
Step 4: Set up the ratio.
\[ \text{Number of signals} = \frac{\text{total bandwidth}}{\text{bandwidth per signal}} = \frac{750}{6}. \]
Step 5: Evaluate.
\[ \frac{750}{6} = 125. \]
Step 6: Conclude.
Hence a co-axial cable can carry at most $125$ TV signals.
\[ \boxed{125} \]

List-I (Modulation Schemes)	List-II (Wave Expressions)
(A) Amplitude Modulation	(I) \( x(t) = A\cos(\omega_c t + k m(t)) \)
(B) Phase Modulation	(II) \( x(t) = A\cos(\omega_c t + k \int m(t)dt) \)
(C) Frequency Modulation	(III) \( x(t) = A + m(t)\cos(\omega_c t) \)
(D) DSB-SC Modulation	(IV) \( x(t) = m(t)\cos(\omega_c t) \)

The maximum number of TV signals that can be transmitted along a co-axial cable is

Show Hint

The Correct Option is B

Solution and Explanation

Top Questions on communication systems

Questions Asked in AP EAMCET exam