Technical data

262 Chapter 9
Channel Scanner
Using the Channel Scanner
Channel Scanner
Using the Channel Scanner
The Channel Scanner measures the power of multiple transmitted signals. It is most
useful for measuring channel power in TDMA, GSM, AMPS, and iDEN channel
bands. Channel power may be measured on a single channel or across multiple
channels or frequencies. The Channel Scanner can be used to measure TDMA,
AMPS, GSM and iDEN adjacent channel power.
CAUTION When measuring multiple channels, the combined channel power must not exceed
+20 dBm at the RF In port.
CAUTION The maximum power for the RF In (Port 1) and RF Out/SWR (Port 2) ports is
+20 dBm (100 mW). When using the 8481A/8482A or N8481A/N8482A with
Option CFT Power Sensors, the maximum input power applied to the Power Sensor
is +24 dBm (300 mW). When using the 8481D Power Sensor, the maximum input
power is +20 dBm (100 mW). When directly coupled to a base station (BTS) or
Access Network (AN), 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.
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).
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” on page 47 or
“Normalizing and Performing a Basic Two Port Insertion Loss Measurement” on
page 125.