Channel Power Measurement
Channel power measurement is one of most common measurements for a radio transmitter.
This test measures the output power, or channel power, of a transmitter over the frequency
range in a specific time interval. Out-of-specification power measurements indicate system
faults, which can be in the power amplifiers and in filter circuits. Channel Power measure-
ments can be used to:
q
Validate transmitter performance
q
Comply with FCC or local regulations
q
Keep overall system interference at a minimum
Required Equipment
q
Site Master S332D
q
Portable antenna for the selected signal frequency
Procedure
Step 1.
On the Site Master, press the
MODE
key, use the Up/Down arrow key to select
the
Spectrum Analyzer
mode and press
ENTER
.
Step 2.
Press the
Signal Standard
soft key, select the appropriate network standard, and
press
ENTER
.
Step 3.
Press the
Select Channel
soft key, enter a value and press
ENTER
.
Step 4.
Press the
AMPLITUDE
key and select the
Ref Level
soft key to set the reference
level.
Step 5.
Press the
Scale
soft key and set the scale to 10 dB/division.
Step 6.
Press the
Atten/Preamp
soft key and set the attenuation to an appropriate attenu-
ation setting using automatic, manual, or dynamic.
Step 7.
Press
Preamp On/Off
or
Preamp Auto
to activate the preamplifier manually or
automatically. The default preamplifier mode is automatic.
Step 8.
Press the
Back
soft key to return to the previous menu.
Step 9.
Press the
MEAS/DISP
key, select the
Bandwidth
soft key and set the resolution
bandwidth and the video bandwidth to Auto.
Step 10.
Press the
Back
soft key to return to the previous menu.
Step 11.
Press the
Trace
soft key and the
Max Hold
soft key to set max hold to ON as in-
dicated to the left of the graph.
Step 12.
Press the
Back
soft key to return to the previous menu.
Step 13.
Press the
Measure
soft key and press the
Channel Power
soft key.
Step 14.
Select the
Int BW
soft key and enter the integration bandwidth frequency appro-
priate for the particular application and press
ENTER
.
Step 15.
Press
Center Freq
and
Channel Span
to set the signal frequency and span if the
signal standard and channel are not selected as in steps 2 and 3.
Step 16.
Make the measurement by pressing the
Measure
soft key. The detection method
is automatically changed to RMS. The Site Master will display the measurement
results.
5-12
Chapter 5 Spectrum Analyzer Measurements