An isotropic antenna is radiating at a frequency of 9mhz. What is the free space path loss at a distance of 4 kms from the transmitter antenna?
Answers
Answer:
The free space path loss is 63.56 dB.
Explanation:
Given data:
Frequency of the signal, f = 9 Mhz
Distance from the transmitter antennae to the receiver, d = 4 kms
To find: Free space path loss
Free space path loss in terms of decibels
=10 log [{(4πdf) / c}^2]
=20 log [{(4πdf) / c}]
= 20 log(d) + 20 log (f) + 20 log {(4π)/c} ….. (i)
The constant term “20log{(4π)/c}”, for distance in kilometers and frequency in megahertz, will be equal to 32.44.
Substituting in equation (i)
Free space path loss (decibels)
= 20 log(d) + 20 log (f) + 32.44
= 20 log(4) + 20 log (9) + 32.44
= 12.04 + 19.08 + 32.44
= 63.56 dB
Answer:
Ans : Imagine holding out your hand and catching words, pictures, and information passing by. That's more or less what an antenna(sometimes called an aerial) does: it's the metal rod or dish that catches radio waves and turns them into electrical signals feeding into something like a radio or television or a telephone system. Antennas like this are sometimes called receivers. A transmitter is a different kind of antenna that does the opposite job to a receiver: it turns electrical signals into radio waves so they can travel sometimes thousands of kilometers around the Earth or even into space and back. Antennas and transmitters are the key to virtually all forms of modern telecommunication. Let's take a closer look at what they are and how they work!
How antennas work
Suppose you're the boss of a radio station and you want to transmit your programs to the wider world. How do you go about it? You use microphones to capture the sounds of people's voices and turn them into electrical energy. You take that electricity and, loosely speaking, make it flow along a tall metal antenna (boosting it in power many times so it will travel just as far as you need into the world). As the electrons (tiny particles inside atoms) in the electric current wiggle back and forth along the antenna, they create invisible electromagnetic radiation in the form of radio waves. These waves, partly electric and partly magnetic, travel out at the speed of light, taking your radio program with them. What happens when I turn on my radio in my home a few miles away? The radio waves you sent flow through the metal antenna and cause electrons to wiggle back and forth.
Applications of Satellite Communication
Satellite communication plays a vital role in our daily life. Following are the applications of satellite communication −
• Radio broadcasting and voice communications
• TV broadcasting such as Direct To Home (DTH)
• Internet applications such as providing Internet connection for data transfer, GPS applications, Internet surfing, etc.
• Military applications and navigations
• Remote sensing applications
Explanation:
CALL US FOR ALL NIOS ASSIGNMENT OR PRACTICAL FILE : 9953056766
Ans : Imagine holding out your hand and catching words, pictures, and information passing by. That's more or less what an antenna(sometimes called an aerial) does: it's the metal rod or dish that catches radio waves and turns them into electrical signals feeding into something like a radio or television or a telephone system. Antennas like this are sometimes called receivers. A transmitter is a different kind of antenna that does the opposite job to a receiver: it turns electrical signals into radio waves so they can travel sometimes thousands of kilometers around the Earth or even into space and back. Antennas and transmitters are the key to virtually all forms of modern telecommunication. Let's take a closer look at what they are and how they work!
How antennas work
Suppose you're the boss of a radio station and you want to transmit your programs to the wider world. How do you go about it? You use microphones to capture the sounds of people's voices and turn them into electrical energy. You take that electricity and, loosely speaking, make it flow along a tall metal antenna (boosting it in power many times so it will travel just as far as you need into the world). As the electrons (tiny particles inside atoms) in the electric current wiggle back and forth along the antenna, they create invisible electromagnetic radiation in the form of radio waves. These waves, partly electric and partly magnetic, travel out at the speed of light, taking your radio program with them. What happens when I turn on my radio in my home a few miles away? The radio waves you sent flow through the metal antenna and cause electrons to wiggle back and forth.
Applications of Satellite Communication
Satellite communication plays a vital role in our daily life. Following are the applications of satellite communication −
• Radio broadcasting and voice communications
• TV broadcasting such as Direct To Home (DTH)
• Internet applications such as providing Internet connection for data transfer, GPS applications, Internet surfing, etc.
• Military applications and navigations
• Remote sensing applications