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intermediate frequency (IF)

An intermediate frequency (IF) is a frequency that is the result of a mixture of two frequencies and is processed in an IF amplifier

. The intermediate frequency process is used in superheterodyne receivers, such as radios and televisions, where the input frequencies of radio or television stations are mixed with the frequency of a tunable oscillator in a mixer

and one of the two sidebands is used as the intermediate frequency.Since the frequency difference between the oscillator frequency and the input frequency is always the same, the intermediate frequency is also always the same

.

The intermediate frequency amplifier can therefore be optimized in its gain response and frequency response curve to the intermediate frequency.

The intermediate frequency is always lower than the input frequency. The level of the intermediate frequency depends on the receiver technology and is 450 kHz to 470 kHz for AM receivers for long wave, medium wave and short wave, 10.7 MHz for VHF receivers, 38.9 MHz for TV receivers and in the range of 950 MHz and 2.150 GHz for LNB converters.

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Englisch: intermediate frequency - IF
Updated at: 29.08.2018
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Translations: DE