Transmitter parameter

AN4378

8/19

DocID025421 Rev 1

3.2

Maximum peak conducted output power

In the document “Guidance for Performing Compliance Measurements on Digital

Transmission Systems (DTS) Operating Under 15.247” [3] the FCC states that the

maximum average conducted output power can be measured as an alternative to the

maximum peak conducted output power for demonstrating compliance to the limit.

In this document, the maximum peak conducted output power is shown.

To measure the maximum peak conducted output power, option 1 of the “Guidance for

Performing Compliance Measurements on Digital Transmission Systems (DTS) Operating

Under 15.247” [3] document, section 8.1, is chosen. This procedure is used when the

spectrum analyzer utilized has an RBW greater than or equal to the DTS bandwidth.

To perform the measurement, center the spectrum analyzer on the desired channel. Set the

RBW greater than or equal to the BlueNRG bandwidth. Set the VBW greater than or equal

of 3 times of the RBW. Set the span greater than or equal of the RBW. The detector must be

set to peak and the trace set to max hold. Use the peak marker function to determine the

peak amplitude level.

The measured BlueNRG output power is 7.5 dBm. This output power is lower than the

maximum permitted output power. In Figure 5 the measurement result is reported.

Figure 5. Max peak conducted output power measurement

AM17620v1

-8

-6

-4

-2

0

2

4

6

8

10

2.3995E+09

2.4000E+09

2.4005E+09

2.4010E+09

2.4015E+09

2.4020E+09

2.4025E+09

2.4030E+09

2.4035E+09

2.4040E+09

2.4045E+09

Frequency [Hz]