Adjustment Procedures
4-2
RTX100A ISDB-T RF Signal Generator Service Manual
Carrier Leakage Adjustment
Perform the following procedure to adjust the carrier leakage:
1.
Use the 75
Ω
BNC(Ma)-to-NC(Fe) adapter, 50
Ω
N(Fe)-to-75
Ω Ν
(
Μ
a)
adapter, 50
Ω
SMA cable, and two 50
Ω
N(Ma)-to-SMA(Fe) adapter to
connect the RF Out connector on the RTX100A to the RF Input on the
spectrum analyzer. See Figure 4-1.
RTX100A rear panel
Spectrum analyzer (E4402B-COM)
50
Ω
SMA cable
50
Ω
N(Ma)-to-SMA(Fe)
adapter
50
Ω
N(Fe)-to-75
Ω
N(Ma) adapter
75
Ω
BNC(Ma)-to-
NC(Fe) adapter
50
Ω
N(Ma)-to-SMA(Fe)
adapter
Figure 4-1: Equipment connection for adjusting the carrier leakage
2.
Set the spectrum analyzer settings as indicated below:
CENTER FREQ
479.143 MHz
. . . . .
FREQ SPAN
15 MHz
. . . . . . . .
RBW
30 kHz
. . . . . . . . . . . . . .
VBW
300 Hz
. . . . . . . . . . . . . .
SWP Speed
0.5 s (Meas Uncal)
. . . . . . . . .
REF Level
0 dBm
. . . . . . . . . .
ATT
10 dB
. . . . . . . . . . . . . . .
3.
Select
ISDB-T/ASI
>
Calibration
on the RTX100A. The
ISDB-T
Calibration Password
dialog box appears.
4.
In the dialog box, enter
rtx100cal
for a password. The
ISDB-T Calibration
dialog box appears.
5.
In the dialog box, set
Reference Frequency
to
13
.
6.
Set
DAC(I) Gain
and
DAC(Q) Gain
to
15
.
7.
Select the
Cal Signal
check box.
Procedure
Содержание RTX100A
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Страница 21: ...Specifications...
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Страница 37: ...Theory of Operation...
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Страница 45: ...Performance Verification...
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Страница 73: ...Adjustment Procedures...
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Страница 79: ...Maintenance...
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