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
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