Superheterodyne receiver
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Superheterodyne receiver有一个缺点,会产生Image Frequency,如下解释:
One problem, which has to be contended with in the superheterodyne receiver, is its ability to pick up a second or imago frequency removed from the signal frequency by a value equal to twice the intermediate frequency.
To illustrate the point, refer Figure 5. In this example, we have a signal frequency of 1 MHz which mix to produce an IFof 455kHz. A second or image signal, with a frequency equal to 1 MHz plus (2 x 455) kHz or 1.910 MHz, can also mix with the 1.455 MHz to produce the 455 kHz.
Reference:
1. https://en.wikipedia.org/wiki/Superheterodyne_receiver
2. http://users.tpg.com.au/users/ldbutler/Superhet.htm
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