Intermediate Frequency Calculator

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Fundamentals of Analog Communications

Amplitude Modulation Characteristics

Analog Noise and Power Analysis

DSBSC Modulation

Frequency Modulation

Sideband and Frequency Modulation

✖Local Oscillation Frequency is that frequency which is used by electronic oscillator along with a mixer to change the frequency of a signal.ⓘ Local Oscillation Frequency [f_lo]			+10% -10%
✖Received Signal Frequency is that frequency which is obtained at the receiver end of a Radio Channel.ⓘ Received Signal Frequency [F_RF]			+10% -10%

✖Intermediate Frequency is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.ⓘ Intermediate Frequency [f_im]

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Formula

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Intermediate Frequency

Formula

`"f"_{"im"} = ("f"_{"lo"}-"F"_{"RF"})`

Example

`"70Hz"=("125Hz"-"55Hz")`

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Intermediate Frequency Solution

STEP 0: Pre-Calculation Summary

Formula Used

Intermediate Frequency = (Local Oscillation Frequency-Received Signal Frequency)
f_im = (f_lo-F_RF)
This formula uses 3 Variables

Variables Used

Intermediate Frequency - (Measured in Hertz) - Intermediate Frequency is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.
Local Oscillation Frequency - (Measured in Hertz) - Local Oscillation Frequency is that frequency which is used by electronic oscillator along with a mixer to change the frequency of a signal.
Received Signal Frequency - (Measured in Hertz) - Received Signal Frequency is that frequency which is obtained at the receiver end of a Radio Channel.

STEP 1: Convert Input(s) to Base Unit

Local Oscillation Frequency: 125 Hertz --> 125 Hertz No Conversion Required
Received Signal Frequency: 55 Hertz --> 55 Hertz No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

f_im = (f_lo-F_RF) --> (125-55)

Evaluating ... ...

f_im = 70

STEP 3: Convert Result to Output's Unit

70 Hertz --> No Conversion Required

FINAL ANSWER

70 Hertz <-- Intermediate Frequency

(Calculation completed in 00.004 seconds)

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BMS College Of Engineering (BMSCE), Banglore

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< 24 Fundamentals of Analog Communications Calculators

Modulation Index with respect to Maximum and Minimum Amplitude

Go Modulation Index = (Maximum Amplitude of AM Wave-Minimum Amplitude of AM Wave)/(Maximum Amplitude of AM Wave+Minimum Amplitude of AM Wave)

Image Rejection Ratio

Go Image Rejection Ratio = (Image Frequency/Received Signal Frequency)-(Received Signal Frequency/Image Frequency)

Phase Constant of Distortion Less Line

Go Phase Constant of Distortion Less Line = Angular Velocity*sqrt(Inductance*Capacitance)

Quality Factor of Tuned Circuit

Go Quality Factor of Tuned Circuit = (2*pi*Resonant Frequency*Inductance)/Resistance

Modulation Index with respect to Power

Go Modulation Index = sqrt(2*((Average Total Power of AM Wave/Average Carrier Power of AM Wave)-1))

Cyclic Frequency of Superheterodyne Receiver

Go Cyclic Frequency = 1/(2*pi*sqrt(Inductance*Capacitance))

Rejection Ratio

Go Rejection Ratio = sqrt(1+(Quality Factor of Tuned Circuit^2*Image Rejection Ratio^2))

Image Frequency Rejection Ratio of Superheterodyne Receiver

Go Image Frequency Rejection Ratio = sqrt(1+(Quality Factor)^2*(Coupling Factor)^2)

Phase Velocity of Distortion Less Line

Go Phase Velocity of Distortion Less Line = 1/sqrt(Inductance*Capacitance)

Amplitude of Carrier Signal

Go Amplitude of Carrier Signal = (Maximum Amplitude of AM Wave+Minimum Amplitude of AM Wave)/2

Modulation Index with respect to Amplitude Sensitivity

Go Modulation Index = Amplitude Sensitivity of Modulator*Amplitude of Modulating Signal

Maximum Amplitude

Go Maximum Amplitude of AM Wave = Amplitude of Carrier Signal*(1+Modulation Index^2)

Minimum Amplitude

Go Minimum Amplitude of AM Wave = Amplitude of Carrier Signal*(1-Modulation Index^2)

Intermediate Frequency

Go Intermediate Frequency = (Local Oscillation Frequency-Received Signal Frequency)

Transmission Efficiency with respect to Modulation Index

Go Transmission Efficiency of AM Wave = Modulation Index^2/(2+Modulation Index^2)

Modulation Index

Go Modulation Index = Amplitude of Modulating Signal/Amplitude of Carrier Signal

Bandwidth of Tuned Circuit

Go Tuned Circuit Bandwidth = Resonant Frequency/Quality Factor of Tuned Circuit

Deviation Ratio

Go Deviation Ratio = Maximum Frequency Deviation/Maximum Modulating Frequency

Image Frequency

Go Image Frequency = Received Signal Frequency+(2*Intermediate Frequency)

Carrier Frequency

Go Carrier Frequency = Angular Frequency of Modulating Signal/(2*pi)

Carrier Power

Go Carrier Power = (Amplitude of Carrier Signal^2)/(2*Resistance)

Crest Factor

Go Crest Factor = Peak Value of Signal/RMS Value of Signal

Figure of Merit of Superheterodyne Receiver

Go Figure of Merit = 1/Noise Figure

Noise Figure of Superheterodyne Receiver

Go Noise Figure = 1/Figure of Merit

Intermediate Frequency Formula

Intermediate Frequency = (Local Oscillation Frequency-Received Signal Frequency)
f_im = (f_lo-F_RF)

How do you determine intermediate frequency?

Intermediate frequency (IF) should be carefully chosen as High IF results in poor selectivity and therefore poor rejection of adjacent channels. - High IF results in problems in tracking of signals in the receivers. - Image frequency rejection becomes poor at low IF or if very high.

How to Calculate Intermediate Frequency?

Intermediate Frequency calculator uses Intermediate Frequency = (Local Oscillation Frequency-Received Signal Frequency) to calculate the Intermediate Frequency, Intermediate Frequency is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception. Intermediate Frequency is denoted by f_im symbol.

How to calculate Intermediate Frequency using this online calculator? To use this online calculator for Intermediate Frequency, enter Local Oscillation Frequency (f_lo) & Received Signal Frequency (F_RF) and hit the calculate button. Here is how the Intermediate Frequency calculation can be explained with given input values -> 70 = (125-55).

FAQ

What is Intermediate Frequency?

Intermediate Frequency is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception and is represented as f_im = (f_lo-F_RF) or Intermediate Frequency = (Local Oscillation Frequency-Received Signal Frequency). Local Oscillation Frequency is that frequency which is used by electronic oscillator along with a mixer to change the frequency of a signal & Received Signal Frequency is that frequency which is obtained at the receiver end of a Radio Channel.

How to calculate Intermediate Frequency?

Intermediate Frequency is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception is calculated using Intermediate Frequency = (Local Oscillation Frequency-Received Signal Frequency). To calculate Intermediate Frequency, you need Local Oscillation Frequency (f_lo) & Received Signal Frequency (F_RF). With our tool, you need to enter the respective value for Local Oscillation Frequency & Received Signal Frequency and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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