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BLOCKING READER: DESIGN AND IMPLEMENTATION OF A ...

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The center frequency is selected to be 915 MHz for this the value of the registers are<br />

0x3B, 0x31 and 0x23 respectively.<br />

6.3.3 Bandwidth<br />

65<br />

fcarrier = fXOSC<br />

2 16 .F REQ[23 : 0] (6.2)<br />

The channel bandwidth can be set by the MDMCFG4 register which contains<br />

CHANBW E[1 : 0] and CHANBW M[1 : 0] as specified in the Equation 6.3. A<br />

default value of 203kHz is chosen, value being 0x2D.<br />

6.3.4 Modulation<br />

BWchannel =<br />

fXOSC<br />

(6.3)<br />

8.(4 + CHANBW M).2CHANBW E<br />

The Blocking Reader requires ASK modulation. It is selected by setting<br />

MOD F ORMAT [2 : 0] as 011.<br />

Other register settings of the transceiver are as shown in the table 6.2

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