Transmitter

AN4133

12/35

Doc ID 023362 Rev 1

compliance with the mask, the measurement is performed with the center frequency set to

916.5 MHz.

Figure 10 defines the channel mask of a radio channel whose frequency is from 920.5 MHz

to 922.3 MHz. The max output power permitted for this bandwidth is 20 mW (+13 dBm), the

SPIRIT1 doesn't support this output power, so the mask compliance is verified with an

output power of 10 dBm. In Figure 11 the SPIRIT1 compliance mask is shown. The output

power is set to 7 dBm to enter on the mask. To work with a higher output power, a reduction

of the data rate and/or frequency deviation is necessary. The center frequency is set to

921.5 MHz.

Figure 12 and 14 define the channel masks of a radio channel whose frequency is from

922.3 MHz to 928.1 MHz. The compliance mask measurements are shown respectively in

Figure 13 and15. The measurements are performed with the center frequency set to

928 MHz and 925 MHz respectively.

The mask in Figure 16 is defined for maximum permitted output power of 1 mW (0 dBm) of a

radio channel whose frequency is from 928.1 MHz to 929.7 MHz. The measurement is

performed with SPIRIT1 set to provide this output power level. Figure 17 shows the

compliance with the mask. The measurement is performed with the center frequency set to

929 MHz.