Agilent Technologies 8935 Series, Manual

Page: 85 / 343

84 Chapter 3
Troubleshooting
Manual Troubleshooting Procedures (Step 4)
3. Set the RF signal generator’s frequency to 100, then 500, 900, and
1800 MHz. For each frequency reset the
Tune Freq
to that
frequency. The Test Set’s measurements should read as follows:
a.
TX Power
should read approximately 0.001 W for each frequency.
b.
Frequency
should read 100, 500, 900, and 1800 MHz respectively.
c. Press the
Spec Anl
key to access the analog spectrum analyzer.
Observe the level and frequency of the signal.
Isolating the RF Source
The RF Generator function uses the following assemblies. Refer to
Figure 3-19 and the block diagrams in Chapter 10 , “Block Diagrams,”
on page 283 .
• A2A120 LO IF/IQ Modulator
• A2A25 Signal Generator Synthesizer
• A2A24 Output Section
• A2A110 Upconverter
Figure 3-19 Isolating the RF Source
OPP
100 W
Attenuator
Splitter
Output
ANT
IN
RF
IN/OUT
DUPLEX
OUT
Input
Attenuator
Power
Detector
Up
Output
Section
IQ
Modulator
Sig Gen
Synthesizer
RF Generator
Reference
RF I/O
RPP
Attenuator
Converter
TO RF ANALYZER
DC Block