SWRA591 April   2019 CC1310 , CC1350

 

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6.2 Transmitter Performance and FCC 15.247 Measurements

Table 4 gives the FCC 15.247 digital modulation requirements that were tested.

Table 4. FCC 15.247 Digital Modulation Requirements [3]

Section Requirements
15.247a2 The 6 dB bandwidth shall be at least 500 kHz
15.247b3 The maximum conducted power shall not exceed 1 W (+30 dBm)
15.247e The power spectral density (PSD) shall not be greater than 8 dBm in any 3 kHz band during any time interval during continuous transmission

Most spectrum analyzers have a measurement option that automatically measures a fixed dB bandwidth. If this is not available, the 6 dB bandwidth must be measured manually by setting up markers.

Measurement setup consisted of the following:

  • Six devices were tested
  • All measurements were performed at 3 V, 25°C
  • Measurements were performed on CC1310EMK-7XD-7793
  • Test results in Table 5 are average numbers of six devices
  • SmartRF Studio was used to test the WB-DSSS cases

Table 5. FCC 15.247 Digital Modulation Requirements [ref]

DSSS 6 dB BW (15.247 a2) Power (15.247 b) PSD (15.247 d)
1 >500 kHz 13.6 dBm 1.4 dBm
2 >500 kHz 13.6 dBm 2.8 dBm
3 >500 kHz 13.7 dBm 4.8 dBm
4 >500 kHz 13.7 dBm 5.1 dBm

For an explanation of marker lines for 6 dB bandwidth measurements, see Figure 30.

figure-31-swra591.gifFigure 30. Explanation of 6 dB Bandwidth Figures