Tektronix RTX100B, Service Manual

Page: 72 / 178

Performance Verification
3-26
RTX100B ISDB-T RF Signal Generator Service Manual
Checking the Carrier Leakage.
1. Use the 75
Ω
BNC(Ma)-to-
Ν
C(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) adapters to
connect the RF Out connector on the RTX100B to the RF Input on the
spectrum analyzer. See Figure 3-15.
RTX100B 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 3-15: Equipment connection for checking the carrier leakage
2.
Set the spectrum analyzer as indicated below:
CENTER FREQ 473.143 MHz . . . . .
FREQ SPAN 2 MHz . . . . . . . .
RBW 10 kHz . . . . . . . . . . . . . .
VBW 300 Hz . . . . . . . . . . . . . .
SWP Speed 2.0 s . . . . . . . . .
REF Level --20 dBm . . . . . . . . . .
ATT 10 dB . . . . . . . . . . . . . . .
3.
Select
ISDB-T/ASI
>
Calibration
on the RTX100B. 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. Verify that the carrier leakage value on the spectrum analyzer is less than
--80 dBm.