AM FILTER AS WSSB FILTER WITH NEW "IF" EQUIVALENT FREQUENCY
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-03
As is shown in AM Mode, the "IF" bandwidth required for audio signal detection is 2 x audio band- Most modern radios consist of dual conversion width. receiver, including two "IF" (Intermediate Frequency) stages. The first "IF" at high frequency is in order to In SSB Mode, the "IF" bandwidth required is the prevent image spurious. The second "IF" at low same as the audio bandwidth. frequency uses narrow band crystal filter providing the required selectivity. Let us assume audio bandwidth of 2.7kHz.