5 Spurious emissions

3GPP51.026Base Station System (BSS) equipment specificationPart 4: RepeatersRelease 17TS

5.1 Test purpose

This test measures the conducted spurious emissions (see clause 3.1) at the antenna ports and the effective power of spurious emissions radiated by the cabinet and structure.

5.2 Test case

The repeater shall be set to maximum gain. All measurement steps, as described in this clause, apply to all antenna ports of the repeater.

a) Spurious emissions from the antenna port:

– one antenna port of the repeater shall be connected to a selective RF measurement device presenting to the repeater a load with an impedance of 50 ohms. An average power measurement of spurious emissions shall be performed for frequency offsets from the carrier frequency greater than 600 kHz under the following two conditions:

i) without any RF input signal. The relevant input antenna port of the repeater shall be terminated with 50 ohms;

ii) with an RF input signal. The relevant antenna input port of the repeater shall be connected to an RF signal generator. A continuous sinusoidal RF signal shall be input at a level which will result, when measured, in the maximum rated RF output power per channel, as declared by the manufacturer. The RF input signal shall be set to the centre frequency of the repeaters pass band. In the case of a channelized repeater, the RF input signal shall be set to the centre of the supported ARFCN closest to the centre of the range of ARFCNs supported by the repeater.

b) Radiated spurious emissions:

– a test site fulfilling the requirements of ITU-R SM.329 [5] shall be used, except when it conflicts with the present document. The repeater shall be placed on a non-conducting support and shall be operated from a power source as recommended by the manufacturer via an RF filter, to prevent the power source or cable from influencing the result of the measurement;

– the relevant output antenna port of the repeater shall be terminated with 50 ohms. The relevant antenna input port of the repeater shall be connected to a RF signal generator in such a way that the connection does not influence the result of the measurement. The RF input signal shall be set to the centre frequency of the repeaters pass band. A continuous sinusoidal RF signal shall be input at a level which will result, when measured, in the maximum rated output power per channel, as declared by the manufacturer.

– an average RF power measurement shall be performed for frequency offsets from the carrier frequency greater than 600 kHz over the frequency range 30 MHz to 4 GHz. The repeater shall be rotated through 360° in the horizontal plane and the test antenna shall be raised or lowered until the maximum spurious signal level is detected. The effective radiated power of each spurious component shall be determined by a substitution measurement;

– the measurements shall be repeated with orthogonal polarization of the test antenna;

– the measurements shall be repeated with no RF input signal, in this case the relevant antenna input port of the repeater shall be terminated with 50 ohms.

Table 3: Measurement bandwidth for spurious emissions

Band	Frequency offset	Measurement bandwidth
	(offset from carrier)
In the relevant BTS transmit Band or MS transmit band	 100 kHz	3 kHz
100 kHz to 50 MHz	‑	10 kHz
50 MHz to 500 MHz outside the relevant transmit band	(offset from edge of the relevant transmit band)
	> 0 MHz	10 kHz
	 2 MHz	30 kHz
	 5 MHz	100 kHz
Above 500 MHz outside the	(offset from edge of the
Relevant transmit band	relevant transmit band)
	> 0 MHz	10 kHz
	 2 MHz	30 kHz
	 5 MHz	100 kHz
	 10 MHz	300 kHz
	 20 MHz	1 MHz
	 30 MHz	3 MHz

Test environment: Normal

5.3 Conformance requirement

The measured power in test case clause 5.2.a) as well as the effective radiated power in test case clause 5.2.b) shall not exceed:

– -36 dBm (250 nW) in the frequency band 9 kHz to 1 GHz;

– -30 dBm (1µW) in the frequency band 1 GHz to 12,75 GHz.

5.4 Reference requirement

3GPP TS 45.005 [13], annex E.