AN4133 Datasheet, PDF (12/35 Pages) STMicroelectronics – Using the SPIRIT1 transceiver under ARIB STD-T108 in the 920 MHz band

Transmitter
AN4133
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.
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Doc ID 023362 Rev 1