What is the difference between a single conversion and a dual conversion receiver?
ALSO SEE THE SUPPORT SECTION FOR A TUTORIAL REGARDING SINGLE AND DUAL CONVERSION. The single conversion receiver uses a single Local Oscillator at 455 kHz removed from the transmitter frequency to achieve narrow band and high sensitivity. A dual conversion receiver has two local oscillators. The first L.O. is 10.7 MHz removed from the transmitter frequency to overcome the one weakness of single conversion; i.e., the lack of rejection at the image frequency. Image for single conversion is only 910 kHz removed from the transmitted frequency while, for dual conversion, it is 21.4 MHz from transmitted frequency and much easier to filter. The 2nd IF allows the rejection of adjacent channels more readily.
LSO SEE THE SUPPORT SECTION FOR A TUTORIAL REGARDING SINGLE AND DUAL CONVERSION. The single conversion receiver uses a single Local Oscillator at 455 kHz removed from the transmitter frequency to achieve narrow band and high sensitivity. A dual conversion receiver has two local oscillators. The first L.O. is 10.7 MHz removed from the transmitter frequency to overcome the one weakness of single conversion; i.e., the lack of rejection at the image frequency. Image for single conversion is only 910 kHz removed from the transmitted frequency while, for dual conversion, it is 21.4 MHz from transmitted frequency and much easier to filter. The 2nd IF allows the rejection of adjacent channels more readily.
