Write the frequency range for each of the following: (i) Standard d Amplitude Modulated (AM) Broadcast (ii) Television AS wave(iii) Satellite Communication. (Answer limit: 100 words, Marks 10) [RPSC 2023]
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Frequency range for the following are :
i) Standard Amplitude Modulated (AM radio) Broadcast:
Frequency range : 535-1605 kHz
ii) Television AS wave (The television waves carry a great deal of visual as well as audio information, each channel requires a large range of frequencies):
VHF (Very High Frequency): 54-88 MHz and from 174 to 222 MHz
UHF (Ultra High Frequency): 470 to around 900 MHz
iii) Satellite communication:
1 GHz – 30 GHz
Note : Frequency range may vary slightly depending on region and country
Frequency Ranges for Different Communications
(i) Standard Amplitude Modulated (AM) Broadcast
(ii) Television AS Wave
(iii) Satellite Communication
These frequency ranges play crucial roles in modern communication technologies.
The Amplitude Modulated (AM radio) carrier frequencies are in the frequency range 535-1605 kHz.
Carrier frequencies of 540 to 1600 kHz are assigned at 10 kHz intervals.
AM radio uses the electrical image of a sound source to modulate the amplitude of a carrier wave.
At the receiver end in the detection process, that image is stripped back off the carrier and turned back into sound by a loudspeaker.
When information is broadcast from an AM radio station, the electrical image of the sound (taken from a microphone or other program source) is used to modulate the amplitude of the carrier wave transmitted from the broadcast antenna of the radio station.
This is in contrast to FM radio where the signal is used to modulate the frequency of the carrier.