Using the Adjacent Channel Power Measurement

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Adjacent Channel Power measures the power of the carrier and the power of the noise in its adjacent channels. The measurement results can help you determine whether the power is set correctly and whether the transmitter filter is working properly. Once you have set the limits, you can easily see whether a test falls within those limits using the mask feature and the color-coded metrics. You can measure the adjacent channel power on one to three adjacent channels on each side of your center channel in the CDMA, W-CDMA, TDMA, GSM Edge and GPRS, AMPS, NMT-450, Tetra, and iDEN channel bands.

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CAUTION:

When measuring multiple adjacent channels, the combined channel power must not exceed +20 dBm at the RF In port.

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CAUTION:

The maximum power for the RF In port and the RF Out/SWR port of the test set is +20 dBm (100 mW). The maximum power for the Power Sensor port is +24 dBm (300 mW). When directly coupled to a base station, the test set can be damaged by excessive power applied to any of these three ports. To prevent damage in most situations when you directly couple the test set to a base station, use the high power attenuator between the test set and the BTS.

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NOTE:

For complex modulation such as CDMA, W-CDMA, 1xEV-DO and GSM, the frequency error measurement is not accurate (see respective analyzers for detailed frequency error results).

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NOTE:

The RF in loss can be added manually or automatically by performing an insertion loss measurement. For measurement instructions refer to "Performing (and Calibrating) a Basic One Port Insertion Loss measurement" or "Normalizing and Performing a Basic Two Port Insertion Loss Measurement".

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