Frequency degradation

Lovely Lavanya

@lovely-lavanya-V9I1rx • Oct 25, 2024

Oct 25, 2024

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Whether frequency of a signal will reduce after travelling some distance?

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Joy Gracia

@joy-8GOU7k • Sep 3, 2014

what u are trying to say by the word "reduce" whether change of frequency...?
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Lovely Lavanya

@lovely-lavanya-V9I1rx • Sep 3, 2014

Yes change in frequency,but lesser than the frequency of transmitted signal..
For example, if v r sending a signal with freq of 10KHz.., and the signal is received at receiver which is located 10kms far from transmitter..,whether the frequency is less than 10KHz? (except noise and distortions)
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shiwa436

@shiwa436-h94d47 • Sep 4, 2014

no loss in frequency occurs while travelling. signal strength will be degraded
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Lovely Lavanya

@lovely-lavanya-V9I1rx • Sep 4, 2014

that means amplitude will be degraded ri8?
but in RADAR application, high frequency RF signal will be sent and the received signal will be with very less frequency.How it is possible?
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Jeffrey Arulraj

@jeffrey-xA7lUP • Sep 4, 2014

Radar works on Principle of scattering of Radio Waves.

You must know that there will be shifting in frequency only due to moving objects reflecting the Radio waves.

So if scattering occurs by moving objects frequency gets either increased or decreased. If object moves away or towards the RADAR there is a shift in frequency due to Doppler Effect
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shiwa436

@shiwa436-h94d47 • Sep 13, 2014

minor shifts in frequency occurs due to doppler effect.. and Radars equation deals with frequency scattered by moving objects.... see wiki pedia for more info on radars...
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ManojKiran Eda

@manojkiran-Cse2se • Oct 4, 2014

Lovely Lavanya
that means amplitude will be degraded ri8?
but in RADAR application, high frequency RF signal will be sent and the received signal will be with very less frequency.How it is possible?
Consider a simple example:

An police car with a ringing siren makes a sound with a particular frequency - the same frequency for all, whether the car is moving or not. Let's say the sound's frequency is 620 Hz. So that's the actual frequency.
Now let us think that you're sitting at that a bus stop, and the car is speeding towards you at 20 miles per hour. The sound waves emitted from the vehicle's siren are bunched up in front of it, because of its movement through space. The air compressions are closer together. So, when the sound waves hit you, you perceive a frequency that is higher than the actual frequency, maybe around 640 Hz.
Similar case if it is moving away..
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