TDMA: Manual Test
CMD 80 Digital Radiocommunication Tester User Manual
3–207
Figure 3–160: TDMA manual transmitter quality test — error vector magnitude
From this measurement display, you may adjust the following parameters.
H
DTC MAC. Press this softkey to set the Digital Traffic Channel Mobile
Attenuation Code (0 to 10). This is a code sent by the base station to control
the output power for the digital voice traffic channel. This also sets the
expected power level and attenuation/gain through the receive path.
H
DISPLAY RANGE. Press this softkey to set the graphic display range
(5 to 30 percent).
H
DISPLAY MODE. Press this softkey to select which curve to display
(CURRENT, AVERAGE, or MAX/MIN).
H
NUMBER OF BURSTS. Press this softkey to set the number of bursts to be
taken into account for averaging. The range is between 1 and 1000.
Limits for Phase Error (Pk, RMS), Magnitude Error (Pk, RMS), and EVM (Pk,
RMS) are defined in the configuration menu by pressing the CONFIG front-pan-
el key (refer to page 3–250). Any result exceeding these limits is displayed as
inverse video (white on black).
Содержание CMD 80
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