Bird Technologies SH-36S-RM-Manual - Manual (Page 79)

Measurements
63
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 second portion of this measurement, access to the trans-
mitter is needed to complete this procedure.
1. Do one of the following:
z Move marker to the desired frequency.
Note:
The default marker placement assumes the carrier
to be measured is the center of the frequency span. It can be
moved via the arrow keys and/or wheel.
z Select Marker to Max Peak 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:
The carrier power and interferer power will be displayed
in selected power units, and the ratio in dB.
Figure 48 Example, Carrier-to-Interference Ratio - Carrier On
Measurement
Settings
STEP 2
STEP 3
Note:
In the status area, the carrier power, interferer power
will be displayed in selected power units, and the ratio in dB.