Tektronix CMD 80, Руководство пользователя

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Analog: Manual Test (Signaling)
CMD 80 Digital Radiocommunication Tester User Manual
3–89
You use the AUDIO FREQUENCY RESPONSE (RAW MODE) configuration
menu to set the beginning frequency, the ending frequency, the number of points
that are sampled, and other parameters (refer to AUDIO FREQ RESPONSE on
page 3–133).
There are three markers available for taking measurements. Press the MARKER
softkey to position the marker along the frequency response curve. The values at
the marker are displayed in the MARKER box.
Press the GRID ON/OFF softkey to toggle a grid display on or off.
You can vary the following base station parameters while in the AUDIO
FREQUENCY RESPONSE (RAW MODE) 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
Press the AF GEN LEVEL softkey to adjust the level of the internal AF
Generator or to turn it off. You can adjust the level to achieve the audio peak
deviation value that you want.
Press the GO TO NORMAL softkey to return to the AUDIO FREQUENCY
RESPONSE (NORMAL MODE) menu.
MODULATION LIMITING.
Press the MODULATION LIMITING softkey to
measure the maximum frequency deviation that the mobile transmitter allows.
See Figure 3–63.
Figure 3–63: Analog transmitter quality — modulation limiting menu