User guide

Carrier-to-Interference Ratio

Calculates the ratio of the carrier signal power to the power level of the noise

and interference signals.

To determine the ratio, two measurements need be done. First sweep should

be the carrier and interferer. The second sweep should be the interferer alone.

Note: Because the transmitted carrier must be turned off for the sec-

ond portion of this measurement, access to the transmitter is needed

to complete this procedure.

1. Do one of the following:

 Move marker to the desired frequency.

Note: The default marker placement assumes the carrier to be mea-

sured is the center of the frequency span. It can be moved via the

arrow keys and/or wheel.

 Press Marker to Max Peak soft key to quickly identify the

signal to be measured.

2. Measure the carrier signal.

3. Turn off the transmitter.

4. Measure the noise and interference signal levels as follows:

Note: In the status area, the carrier power and interferer power will be

displayed in selected power units, and the ratio in dB.

Figure 78 Example, Carrier-to-Interference Ratio - Carrier On

Measurement

Settings

STEP 2

STEP 1