12
Section 6—Setting Up a 20 dB Increment on the
Test Set
You can increase or decrease the
Sctr A Pwr
by 20 dB
with a press of one button. Listed below are the
steps to set up a 20 dB increment adjustment:
1. Go to the CDMA TRANSMITTER POWER
RANGE TEST screen, see Figure 13.
2. Move the cursor to the
Sctr A Pwr
field (item 7).
3. Press the
Incr Set
key on the front panel of the
test set.
4. Typically
I = 1.00
will appear in the
Sctr A Pwr
field. Using the DATA KEYS, enter the value
20
and then press the knob.
5. By using the up- and down-arrow keys (or turn-
ing the knob) on the front panel of the test set,
the power will increase or decrease in incre-
ments of 20 dB each time an arrow key is
pressed (or the knob is turned).
Section 7—Determining the Test Set’s Trigger
Time Delay
In order to perform an accurate open loop power
control time-response test, it is important to accu-
rately determine the delay between the trigger sig-
nal and the actual power step at the test set’s out-
put. Inaccurate delay times will cause the test to
start before the power level from the test set has a
chance to change. This will often cause the test
results to indicate a failure. For details, see
Appendix 5—Trigger Cable and Trigger Signal
Description.
1. Turn off the phone.
2. On the spectrum analyzer:
2a. Press the PRESET key on the front panel.
2b. Press the
Spectrum Analyzer
softkey.
3. On the test set, set the
Sctr A Pwr
field in the
CDMA TRANSMITTER POWER RANGE TEST
screen to
–40 dBm
(see Figure 13, item 7).
4. For testing PCS phones only, on the test set, set
the
Output Atten Hold
field to
on
(see Figure 13,
item 8).
5. On the spectrum analyzer:
5a. Press the FREQUENCY key.
5b. Enter the center frequency that the test set
(forward channel) is operating on. For
example: RF Chan Std = US PCS; RF
Channel = 500; forward channel frequency
= 1955 MHz.
5c. Press the ENTER key (same as Hz/µv/µs
key).
5d. On the spectrum analyzer, press the SPAN
key.
Figure 13. CDMA TRANSMITTER POWER RANGE TEST
Screen
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