The discussion centers on the implications of having a signal at the Intermediate Frequency (IF) of 455 kHz in AM radio systems. It is established that a strong signal at this frequency can cause interference with the intended reception, leading to degraded performance. The choice of 455 kHz as an IF frequency is not arbitrary; it is selected based on receiver design and the desired receiving band. Other IF frequencies, such as 10.7 MHz for FM receivers, are also noted as alternatives depending on specific requirements.
PREREQUISITESRadio engineers, communication system designers, and anyone involved in the development or optimization of AM and FM radio receivers will benefit from this discussion.
oufa said:why it is disaster if asignal exists in am at frequency of 455 khz , i mean asignal is at the IF frequency.
also why IF not greater or smaller than 455khz i need to know
thanks
This should be obvious. If the signal is strong enough to enter the IF amplifiers then it will cause interference by coexisting with the signal you are trying to receive.why it is disaster if asignal exists in am at frequency of 455 khz , i mean asignal is at the IF frequency.
455khz is not the only IF frequency. Other frequencies are used depending on the receiver design, desired receiving band, and number of conversions. For example, 10.7mhz is a common IF for the FM broadcast band receiver.also why IF not greater or smaller than 455khz i need to know
thanks