Table of Contents
Advertisement
2. On the audio analyzer:
a. Reset the instrument.
b. Set the output frequency to 1 kHz.
c. Set the output amplitude to 1.4 V.
3. On the signal generator:
a. Set the output frequency to 840 MHz.
b. Set the output amplitude to 0.0 dBm.
c. Set the function to FM with EXT AC Modulation.
d. Set the MOD LEVEL to 25 kHz.
4. On the Test Set:
a. Press
.
Preset
b. Select the CONFIGURE screen.
c. Set the RF Display field to Freq.
d. Select the RF ANALYZER screen.
e. Set the Tune Freq to 840 MHz.
f. Set the Input Port field to Ant.
g. Set the IF Filter field to 230 kHz.
h. Set the Squelch field to Open.
i. Select the AF ANALYZER screen.
j. Set the AF Anl In field to FM Demod.
k. Set the Filter 2 field to >99kHz LP.
l. Set the Detector field to Pk+.
5. Set the audio analyzer to the following frequencies: 20 Hz, 100 Hz, 1 kHz, 10
kHz, 35 kHz, and 70 kHz. For each frequency adjust the audio analyzer's level
until the measuring receiver reads 25 kHz FM deviation and record the
deviation read on the Test Set.
6. Of the FM deviations measured by the Test Set find the maximum and
minimum deviations and make the following calculation:
dB
Record the dB difference in the Performance Test Record and compare it with
the limits shown.
RF Analyzer FM Bandwidth Performance Test 22
Maximum Deviation
•
------------------------------------------------- -
=
20
log
Minimum Deviation
Performance Tests
185
Advertisement
Table of Contents
Troubleshooting
