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  2. Superheterodyne receiver - Wikipedia

    en.wikipedia.org/wiki/Superheterodyne_receiver

    If the local oscillator frequency is less than the desired reception frequency, it is called low-side injection (f IF = f RF − f LO); if the local oscillator is higher, then it is called high-side injection (f IF = f LO − f RF). The mixer will process not only the desired input signal at f RF, but also all signals present at its inputs ...

  3. Single-sideband modulation - Wikipedia

    en.wikipedia.org/wiki/Single-sideband_modulation

    With high-side injection, the spectral components that were distributed around 45000 Hz will be distributed around 2000 Hz in the reverse order, also known as an inverted spectrum. That is in fact desirable when the IF spectrum is also inverted, because the BFO inversion restores the proper relationships.

  4. Frequency mixer - Wikipedia

    en.wikipedia.org/wiki/Frequency_mixer

    Frequency mixer symbol. In electronics, a mixer, or frequency mixer, is an electrical circuit that creates new frequencies from two signals applied to it.In its most common application, two signals are applied to a mixer, and it produces new signals at the sum and difference of the original frequencies.

  5. Local oscillator - Wikipedia

    en.wikipedia.org/wiki/Local_oscillator

    In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal. This frequency conversion process, also called heterodyning, produces the sum and difference frequencies from the frequency of the local oscillator and frequency of the input signal. Processing a signal at a fixed frequency ...

  6. Intermodulation - Wikipedia

    en.wikipedia.org/wiki/Intermodulation

    The output power of the two carriers (M1 and M2) increases by about 1 dB in each frame, while the 3rd order intermodulation products (D3 and D4) grow by 3 dB in each frame. Higher-order intermodulation products (5th order, 7th order, 9th order) are visible at very high input power levels as the amplifier is driven past saturation.

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