BIRD SignalHawk SH-36S-RM-ASL, Руководство по эксплуатации, Страница: 136 / 195

PC/Rack Mount SignalHawk with ASL
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Carrier-to-Interference Ratio Measurement
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.
Carrier-to-Interference Ratio Setup
NOTE
Because the transmitted carrier must be turned off for the second portion of this
measurement, access to the transmitter is needed to complete this procedure.
The Carrier-to-Interference Ratio Measurement can be turned on using the Start Menu or the
Measure Menu .
1. Click on the Measure Menu button ( 5 ). See Carrier-to-Interference Ratio Measurement
Carrier ON Figure .
2. Click on C/I: Menu Button.
3. If measurement is not already on, Click on C/I: On/Off option ( 1 ) to turn on
measurement.
NOTE
Underlined option is the active option.
4. Move the marker to the frequency to measure. Do one of the following:
•
Use mouse scroll wheel or keyboard arrow keys to move marker to the desired
frequency.
•
Select Marker to Max Peak to quickly identify the signal to be measured.
5. Click on Measure Carrier option ( 3 ) to measure the carrier signal. The Carrier
measurement ( 6 ) will be displayed in the measurement area at the bottom of the
screen.
6. Turn off the carrier transmitter.
7. Click on Measure Interference option ( 4 ) to measure in interference signal level. See
Carrier-to-Interference Ratio Measurement Carrier OFF Figure .
8. The Carrier measurement ( 7 ) will be displayed in the measurement area at the bottom
of the screen.
NOTE
The carrier power and interferer power will be displayed in selected power units, and
the ratio in dB.