Thanks to you both for the replies.
2.455 kHz: Yeah certainly, when I started to study about AM receivers, I came across this number a couple of times. But seriously what could be the advantage of it besides an official spectrum allocated by the Radio standards organisation..? Because in FM, IF frequency makes more sense to me. If you dont have an IF stage in FM receivers,then you end up in requiring a super high(absolutely impossible in an IC level to realise) quality factor for the RF filter to extract the information.(i.e I meant the inability to design inductors with such high Q factors). So you use a mixer then, convert it down to 10.7 MHz, there you go..! you could easily make a fixed bandpass filter and place it next to mixer in order to carry out the further processing steps in a FM receiver stage.
Could you have comments/suggestions/extra information on these points mentioned...
Dan