AN4133

Receiver

Doc ID 023362 Rev 1

29/35

5

Receiver

Only one measurement is required for the receiver, the limit on secondary radiated

emission. This measurement is performed under the following conditions: Tc = 25 °C,

Vdd = 3.0 V, f = 922 MHz (middle frequency of the bandwidth used).

5.1

Limit on secondary radiated emission

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

equipment. The spurious emission strength at the antenna input has to be less than the

values in Table 2 for the convenience radio stations and Table 4 for the low-power radio

stations. The two tables are the same, so the measurement is performed only once, setting

the receiver to 922 MHz, maximum gain.

The measurement results are given in Figure 34 to 39. The entire standard requirements

are met from the SPIRIT1 in receiver mode.

Figure 34.

Receiver radiated emission in the 10 - 710 MHz bandwidth

-110

-100

-90

-80

-70

-60

-50

-40

1.00E+07

1.10E+08

2.10E+08

3.10E+08

4.10E+08

5.10E+08

6.10E+08

7.10E+08

Frequency [Hz]

Convenience radio station receiver spurious emission 10 - 710 MHz

Spirit

ARIB mask