7 Out of band gain

11.263GPPBase Station System (BSS) equipment specificationPart 4: RepeatersRelease 1997TS

7.1 Test purpose

To test the net gain of the repeater outside the relevant MS or BTS transmit band. This test shall also check the net gain at harmonic frequencies.

7.2 Test case

The repeater shall be set to maximum gain. In case of a channel selective repeater, two of the channel selective modules shall be set to the lowermost and the uppermost ARFCN within the repeater’s operating band.

A continuous sinusoidal RF signal shall be fed successively at frequency offsets Y from the edges of the relevant MS or BTS transmit frequency band into the relevant input port of the repeater. The frequency offsets Y shall have the following values:

400 kHz, 600 kHz, 800 kHz, 1 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz

This shall be repeated with an RF input signal successively set to all harmonic frequencies of the repeaters operating band up to 12.75 GHz (i.e. multiples of the centre frequency of the repeaters operating band up to 12.75 GHz).

The power level of the RF input signal shall be at least 5 dB below the power level which would produce, when applied within the operating band, maximum rated output power, as declared by the manufacturer. This is to ensure that the equipment is operating in the linear output range.

The average output power in each case shall be measured and the net gain shall be recorded.

The measurements shall apply to all antenna ports of the repeater.

Test environment: Normal

Extreme temperature

7.3 Conformance requirement

The net gain in both directions through the repeater shall be less than:

50 dB at 400 kHz offset and greater

40 dB at 600 kHz offset and greater

35 dB at 1 MHz offset and greater

25 dB at 5 MHz offset and greater

from the edges of the relevant MS or BTS transmit bands.

7.4 Reference requirement

GSM 05.05 [6], annex E