Tektronix CMD 80, Руководство пользователя

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Analog: Manual Test (Signaling)
3–88
CMD 80 Digital Radiocommunication Tester User Manual
You can vary the following base station parameters while in the AUDIO
FREQUENCY RESPONSE test menu:
H
BS Power. Press the BS POWER softkey to set the level of the base station
transmitter power.
H
Voice mobile attenuation code. The voice mobile attenuation code is a code
sent by the base station to control the output power for voice transmissions.
Press the VOICE MAC softkey to set the voice MAC parameter.
H
Audio frequency generator level. Press the LEVEL softkey to adjust the
level of the internal AF Generator or to turn it off. Set the level so that the
audio peak deviation is within the audio peak deviation error range that you
specify in the AUDIO FREQUENCY RESPONSE configuration menu (refer
to AUDIO FREQ RESPONSE on page 3–133).
NOTE
. The tester performs the audio frequency response measurement only when
the audio peak deviation is within the limits set in the AUDIO FREQUENCY
RESPONSE configuration menu (refer to AUDIO FREQ RESPONSE on
page 3–133).
Press the GO TO RAW MODE softkey to measure the audio frequency response
of the mobile transmitter in the raw mode (see Figure 3–62). When the tester
measures the audio frequency response in the normal mode, a de-emphasis filter
is active and you can use the configuration menu to establish limit lines for the
measurement. However, in the raw mode, the tester takes the measurements
without the de-emphasis filter, and you cannot set limit lines for the measure-
ment. See Figure 3–56 on page 3–81.
Figure 3–62: Analog transmitter quality — audio frequency response (raw mode)
menu