Question

Can somebody state the Principles of Radio Receivers?

Answer 1

in radio receiver there is a amplifier to amplify the signal ,a transducer to convert the signal to its original form because there is one transducer already installed at transmitter side to convert it into electrical form.a filter which may be band pass ,low pass or high pass or any other to get desired thingand then decoder is used to decode the msg in original form and in last receiver is there to receive the signal in the nearly same form as it is send at transmitter end

Answer 2

no pricipal will not differ but some additional equipment is present

Answer 3

I think simplest think is to understand the RLC circuit in resonance condition

Answer 4

@deba_001-he is talking about digital communication

Answer 5

Deba nailed it.. in one word.. the answer is Series LCR resonance circuit!
when u turn the knob of your radio, you change the value of your capacitor.. changing the resonant frequency.. your circuit will vibrate like crazy when em waves of the same frequency hit your antenna.. !

Answer 6

@mashy-we are talking about whole which comes under digital communication.radio is one of the example of receiver.

Answer 7

well he specifically asked for radio recievers :P

Answer 8

but after few replies he talked about digital communication

Answer 9

he didn't even reply? :O

Answer 10

oh sry he was carlo gp lol

Answer 11

:D ..

Answer 12

@CarlosGP thats why i said no difference but some additional blocks added in digital communication.

Answer 13

@carlos gp-u might be right,but according to me principal is generally same ,only recovering principle is different

Answer 14

transmitter,encoder,modulator,demodulator,regenerative repeater, and receiver are same in both the communication.
and since analog signal and digital signal differ in nature so recover method will be different but common thing is mentioned above

Answer 15

08surya thank you for modifying the question.However the general principle of Radio receiver and tuner circuit which I was mentioning.
In the early days of radio, the resonance of the antenna in combination with its associated inductive and capacitive properties was indeed the item which tune in the frequency you wanted to listen to. You didn't actually change the length of the antenna, but by changing the inductor (a coil) or capacitor connected to the antenna you tuned the resonance. The output signal is an alternating voltage, and by rectifying it with a diode (called a "crystal" then..) you could extract a signal modulated as a varying amplitude of the carrier wave. All this without any battery! :)

Answer 16

To add the difference between an analog and a digital radio comes in the circuits after this and basically an analog radio extracts a modulation from the intermediate frequency which is amplified and sent to the speakers or radio output. In a digital radio, the signal represents a digital version of the audio, just like a WAV or MP3-file on a computer is a digital representation which can be turned back into an analog signal you can send to a speaker. The benefit of this is that the digital signal requires (potentially) less bandwidth in the air so you can fit more signals in the same "airspace" and that the digital signal can be less susceptible to noise. I write "can", because unfortunately many commercial digital radio/TV stations don't do this to improve the viewing or listening quality but just to fit in more content.
There is also a very interesting thing called Software Defined Radio, SDR, which is the principle where the intermediate frequency (or in some cases the antenna frequency directly) is turned into a digital signal and demodulated by a signal processor which is completely software-upgradeable. Since it is much easier to program new software than mending electronic components around, this created large interest in the radio hobby community where you can completely change the properties of a radio receiver just by downloading someone else's software from the net or write a new one yourself.
If you include SDR, and apply it without any intermediate frequency you do indeed have a purely software-way of tuning your source like you ask for, [although this is not how the most common digital radios work currently.]

Answer 17

Thank you @Mashy- for reassuring that what I understood in the question asked by @kenjiof1996 was having the same kinda response in your mind too

Answer 18

ok, thanks a lot guys... @Deba_001 @Mashy @08surya

Answer 19

@kenjiof1996 ur welcme buddy