UM-B-074
DA1468x Range Extender Daughterboard
User Manual
Revision 1.1
17-Apr-2018
CFR0012
47 of 60
© 2018 Dialog Semiconductor
15.2.2
Emission Limitations Conducted (Transmitter)
15.2.2.1
Test Specification
In any 100 kHz bandwidth outside the frequency band in which the digitally modulated intentional
radiator is operating, the radio frequency power that is produced by the intentional radiator shall be at
least 20 dB below that in 100 kHz bandwidth within the band that contains the highest level of the
desired power. If the transmitter complies with the conducted power limits based on the RMS
averaging over a time interval, the attenuation required shall be 30 dB instead of 20 dB.
15.2.2.2
Test Setup
The DA14680/681 range extender was mounted on a PRO-motherboard. In order to evaluate the
harmonic levels production, the
SDK RF_Tool_CLI
was used. The boards under test were set into
continuous wave modulation transmit mode using the following command
.
:
ble_txstream \<FREQUENCY_MHz\> \<POWER\> \<PAYLOAD_TYPE\>
An RF cable assembly was connected to J3 RF Switch connector (MM8130-2600 by Murata) and at
the other end to the spectrum analyzer. Three channels were tested: channels 0, 19 and 39.
15.2.2.3
Test Results
Table 25: Measured Reference Level
Parameter (dBm)
CH00
– 2402 MHz
CH19
– 2440 MHz
CH39
– 2480 MHz
Reference Level
12.21
12.18
11.90
Limit (20 dB below peak)
-7.79
-7.82
-8.1
Table 26: Conducted TX Harmonics at CH00, CH19, CH39
Parameter (dBm)
CH00
– 2402 MHz
CH19
– 2440 MHz
CH39
– 2480 MHz
2nd harmonic power
-54.87
-53.54
-54.28
3rd harmonic power
-54.15
-49.51
-55.58
4th harmonic power
-
-
-60.84
5th harmonic power
-60.09
-58.98
-59.90
Lowest frequency: 2402 MHz
All peaks are more than 20 dB below the limit.
Middle frequency: 2440 MHz
All peaks are more than 20 dB below the limit.
Highest frequency: 2480 MHz
All peaks are more than 20 dB below the limit.
Verdict:
All measurements comply with the limits specified in FCC 15.247, Subclause (d).
