AN4110

Transmitter parameter

Doc ID 023182 Rev 1

9/18

Figure 7.

Spectral mask measurement, 100 kHz channel spacing, 38.4 kbps data

rate, 20 kHz frequency deviation

2.3

Unwanted emissions in the spurious domain

Spurious emissions are unwanted emissions in the spurious domain at frequencies other

than those of the wanted carrier frequency and its sidebands associated with normal test

modulation.

A spectrum analyzer is used as external receiver. The measurement is performed setting

the SPIRIT1 with modulation and checking unwanted spurious emissions up to 6 GHz as

described in the ETSI [2] subclause 7.8.

The measurement is split into two figures. In Figure 8 the unwanted spurious emission for a

frequency below 1 GHz is shown. The measurement is performed setting the instrument

with a resolution bandwidth of 100 kHz, as requested in ETSI [2]. In Figure 9 the unwanted

spurious emission for a frequency from 1 GHz to 6 GHz is shown. The measurement is

performed setting the instrument with a resolution bandwidth of 1 MHz, as requested in

ETSI [2]. In the two images the mask request from the ETSI is reported also.

The unwanted emissions in the spurious domain of SPIRIT1 comply with ETSI [2] subclause

7.8.