AN4103

Receiver parameters

Doc ID 023130 Rev 1

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Figure 14.

RX blocking vs. CW interferer offset with 1 % BER

3.3

Receiver spurious radiation

Spurious radiation from the receiver come from components at any frequency, radiated by

the equipment and antenna.

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

setting SPIRIT1 without modulation and observing until 4 GHz as described in ETSI [2]

subclause 8.6.

The measurement is split between two figures, showing the frequency ranges above and

below 1 GHz. Figure 15 indicates the unwanted spurious emission for frequencies below

1 GHz. This measurement is performed by setting the instrument with a resolution

bandwidth of 100 kHz, as requested in ETSI [2]. In Figure 16 the spurious radiation from the

receiver for frequencies from 1 GHz to 4 GHz is shown. This measurement is performed by

setting the instrument with a resolution bandwidth of 1 MHz, as requested in ETSI [2]. In the

two figures the mask request from ETSI is also indicated.

The receiver spurious radiation of SPIRIT1 complies with ETSI [2] subclause 8.6.

-10

0

10

20

30

40

50

60

70

80

-10000

-8000

-6000

-4000

-2000

0

2000

4000

6000

8000

10000

CW interferer offset [kHz]

1.2 kbps

2.4 kbps

ETSI Limits

AM16357v1