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anwer_sbh said:Why does the value of IF for the AM receiver is 455 KHz? why this value not another.
karesz said:Yes, I think too.
Then at this times it was an ITU Conference, wher are the Transmitter frequencies light retailed/corrigated too & after them it exist as IF only 455 KHz...
K.
because you will find such (only paar 100KW up to MW) transmitters below 550KHz... Their are in EU from Germany, Hungary & I think one Arabic too...LvW said:...at the lower end of the AM band of, let´s say, Fr=600 kHz will have a corresponding image frequency which is higher by twice the IF. For IF=455 kHz this leads to Fim=1510 kHz....
Added somewhat later: With respect to image frequency suppression, a higher IF would be, of course, better. But the other aspects as mentioned above lead to this compromize.
karesz said:to LvW,
I wishd to tell /I mean(but my english...); you can not assume that the MW band begins at 600KHz, then its begin is over tenth of decads at 520 KHz...
K.