Maximum Radiated Power Measurement - Silicon Laboratories BG22 Explorer Kit User Manual

5.4.1 Maximum Radiated Power Measurement

The transceiver was operated in unmodulated carrier transmission mode and the output power of the radio was set to 6 dBm. The re-
sults are shown in the table below.
The correction factors are applied based on the BLE 125 Kb/s coded modulation, shown in section
er. For the rest of the supported modulation schemes the correction factors are larger, thus the related calculated margins would be
higher compared to the ones shown in the table below. Thus, the below margins can be considered as worst case margins.
Measured Un-
Frequency
modulated EIRP
(2440 MHz)
[dBm]
Fund 7.7
2nd -54.5
3rd -39.2
4th -50.5
5th -46.3
As it it is shown in the table, with 6 dBm output power, the radiated power of the fundamental is higher than 6 dBm due to the antenna
gain. The 3rd harmonic is above the limit in case of the unmodulated carrier transmission. But with the relaxation of the supported mod-
ulation schemes, the margin is at least 2.8 dB.
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Table 5.5. Maximums of the Measured Radiated Powers of BRD4108A
Orientation
YZ/V
YZ/V
YZ/V
XZ/H
XY/V
BLE 125 Kb/s Coded Modulation
Calculated
Correction Fac-
Modulated EIRP
tor [dB]
[dBm]
NA (0 is used) 7.7
-2.7 -57.2
-4.8 -44.0
-5.5 -56.0
-6.3 -52.6
UG509: BG22 Explorer Kit User's Guide
5.3 Relaxation with Modulated Carri-
Limit in EIRP
Modulated Mar-
[dBm]
gin [dB]
22.3 30.0
16.0 -41.2
2.8 -41.2
26.0 -30.0
11.4 -41.2
Rev. 1.1 | 19
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