AN4174

Transmitter

Doc ID 023728 Rev 1

13/21

3.2

Permissible value of the occupied bandwidth

The permissible value for an occupied bandwidth (the bandwidth in which the mean powers

radiated below its lower frequency limit and above its upper frequency limit are each equal

to 0.5% of the total mean power radiated by a given emission, which is 99% of the powers)

is 8.5 kHz. However, for transmitters emitting radio waves in an occupied bandwidth over 8.5

kHz and up to 16 kHz, the value is 16 kHz.

The measurements of these parameters are reported in figures 4 to 7. In Figure 4 and

Figure 5 99% of the emitted power is concentrated in 8.5 kHz, in Figure 6 and Figure 7 99%

of the emitted power is integrated in the 16 kHz bandwidth.

3.3

Permissible values of spurious emission or unwanted

emission

Spurious emission refers to the emission on a frequency or frequencies which are outside

the permitted bandwidth and the level of which may be reduced without affecting the

corresponding transmission of information, including a high harmonic emission, a low

harmonic emission, a parasitic emission and an intermodulation product, but excluding an

out-of-band emission.

Out-of-band emission refers to the emission which results from the modulation process on a

frequency or frequencies outside the permitted bandwidth.

Unwanted emission refers to the emission consisting of the spurious emission and the out-

of-band emission.

The permissible value of the unwanted emission intensity refers to the permissible value

defined according to the mean power of unwanted emissions of each modulated frequency

supplied to the feeder. The permissible value of the unwanted emission intensity is 2.5 µW (-

26 dBm) or lower, as measured in the average power.

The spurious emission measurements are reported in figures 8 and 9. In Figure 8 the

spurious emission below 1 GHz is reported, in Figure 9 spurious emission above 1 GHz is

reported. In the two images the ARIB STD-T67 specification mask is also reported.

The SPIRIT1 meets the spurious emission requirements with margin.