14.4.3.3 Spectrum Mask

The AT86RF212B can be operated in different frequency bands, using different power levels, modulation schemes, chip rates, and pulse shaping filters. The occupied bandwidth of the transmit signal depends on the chosen mode of operation. Values listed in table below are based on a default power setting of +5dBm and usage of the Continuous Transmission Test Mode with Frame Buffer content {0x01, 0x00}.

Knowledge of modulation bandwidth, power spectrum, and side lobes is essential for proper system setup that produces non-overlapping channel spacing.

Table 14-32. Physical Layer Mode and Occupied Bandwidth
PHY Mode	99% Occupied Bandwidth [kHz]	6dB Bandwidth [kHz]	20dB Bandwidth [kHz]
Reference Detector Span RBW VBW Sweep	ETSI EN 300 220 [6] RMS 2 MHz 100 kHz 1 MHz 500 ms	FCC 15.247 [5] Peak/MaxHold 2 MHz 5 % of bandwidth 3 x RBW AUTO	FCC 15.247 [5] Peak/MaxHold 2 MHz 1% of bandwidth 3 x RBW AUTO
BPSK-20	445	295	430
BPSK-40	775	570	850
BPSK-40-ALT	805	620	815
OQPSK-SIN-RC-100	450	260	340
OQPSK -RC-100	490	355	365
OQPSK-SIN-250	1190	645	1210
OQPSK-RC-250	1245	850	1220

The following figures show the power spectra for the different modes listed in the table above. The spectra were captured using default settings of AT86RF212B. The resolution bandwidth of the spectrum analyzer was set to 30kHz; the video bandwidth was set to 10kHz. For the OQPSK-SIN-250 modulation and OQPSK-RC-250 modulation the resolution bandwidth of the spectrum analyzer was set to 100kHz; the video bandwidth was set to 30kHz.

Figure 14-43. Spectrum of OQPSK-SIN-RC-100

The figures above illustrate typical spectra of the transmitted signals of the AT86RF212B and do not claim any limits.

Refer to the local authority bodies (FCC, ETSI, etc.) for further details about definition of power spectral density masks, definition of spurious emission, allowed modulation bandwidth, transmit power, and its limits.