5.2.2.2 FCC15.247 Emission Limits for the 902-928 MHz Band
FCC 15.247 allows conducted output power up to 1 Watt (30 dBm) in the 902-928 MHz band. For spurious emmissions the limit is
-20 dBc based on either conducted or radiated measurement, if the emission is not in a restricted band. The restricted bands are speci-
fied in FCC 15.205. In these bands the spurious emission levels must meet the levels set out in FCC 15.209. In the range from
960 MHz to the frequency of the 10th harmonic, the limit is defined as 0.5 mV/m at 3 m distance (equals to -41.2 dBm in EIRP).
In case of operating in the 902-928 MHz band, from the first 10 harmonics only the 2nd and 7th harmonics are not in restricted bands.
The 6th is also not in a restricted band, but only if the carrier frequency is above 910 MHz. For these the -20 dBc limit should be
applied. For the harmonics that are in a restricted band, the -41.2 dBm limit should be applied.
5.2.2.3 ARIB STD-T108 Emission Limits for the 920.5-923.5 MHz Band
Based on ARIB STD-T108, the allowed maximum fundamental power for the 920.5-923.5 MHz band is 250 mW (24 dBm) both for con-
ducted and radiated measurements.
For the unwanted emission limits, see the table below.
Table 5.2. ARIB STD-T108 Spurious Domain Emission Limits (Conducted)
Frequency
710 - 900 MHz
900 - 915 MHz
930 - 1000 MHz
920.3 - 924.3 MHz
(except for |f-fc| <=
(200+100xn) kHz)
Other frequencies
below 1000 MHz
1000 - 1215 MHz
Frequencies
above 1215 MHz
Spurious Emission
Limits
-55 dBm
-29 dBm
-36 dBm
-45 dBm
-30 dBm
Secondary Emission
Limits (Receiver)
-55 dBm
—
-54 dBm
-47 dBm
-47 dBm
The above limits are also applied for the radiated measurements (assuming 0 dB antenna gain).
5.3 RF Performance
5.3.1 Conducted Power Measurements
During the conducted measurements, the BRD2603A board was supplied through its USB connector by connecting to a PC through a
USB cable. The supply for the RF section (RFVDD) and the power amplifier (PAVDD) was 1.8 V provided by the on-chip DCDC con-
verter.
The RF output of the board was connected directly to a Spectrum Analyzer. The transceiver was operated in continuous carrier trans-
mission mode, the output power was set to 14 dBm.
5.3.1.1 Conducted Power Measurements
The typical output spectrums are shown in the following figures.
UG532: ZGM230S Dev Kit User's Guide
Radio
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