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doubt in frequencies of at26rf211

hi,

iam a new entrant into RF devices. i have got a doubt on the frequency registers of 86RF211. in the data sheet, it is given that for transmission we require two frequencies (one for transmitting a logic 1 and another for transmitting a logic 0). but for reception we are going for only one register. can anyone pls tell me why this is so.
let's say we are working at 868.3 MHz. so to transmit in the first register we program a value of 868.296 MHz and 868.304 for logic 0 and 1 respectively.
but at the reception side, if we want to accept a logic 0, we must accept a value of 868.296 MHz and for logic 1, we must accept a value of 868.296. but in the data sheet it is said that only one register is enough to do the reception. i could not understand the idea behind this.
i would be grateful if anyone of u can help me in this
thanks in anticipation
regards
ravi

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