I am surprised that TI published the app note as is because the transmitter in this app note actually fails the EN 300-220-1 regulations.
The bandwidth specified in the mask in figure 4.17 is bigger then allowed in the EN regulations. You are only allowed to transmit at the levels given in the figure in the band 869.4 - 869.650 Mhz. The bands on either side are reserved for alarm use. You are not allowed to interfere with them. This means the maximum allowed bandwidth for the transmitter is 250Khz.. If we specify this in the mask rather then the 500-600 kHz given, the spectrum exceeds the -30dBm required for the EN regulations at the edge of the regulatory band. .
