Figure 4-1: Equipment Connection For Adjusting The Carrier Leakage; Carrier Leakage Adjustment - Tektronix RTX100A Service Manual

Adjustment Procedures

Carrier Leakage Adjustment

Procedure
RTX100A rear panel
75 Ω BNC(Ma)-to-
NC(Fe) adapter
50 Ω N(Fe)-to-75 Ω
N(Ma) adapter
50 Ω N(Ma)-to-SMA(Fe)
adapter

Figure 4-1: Equipment connection for adjusting the carrier leakage

4-2
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(Μa)
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.
50 Ω SMA cable
2. Set the spectrum analyzer settings as indicated below:
CENTER FREQ
FREQ SPAN . . . . . . . .
RBW . . . . . . . . . . . . . .
VBW . . . . . . . . . . . . . .
SWP Speed . . . . . . . . .
REF Level . . . . . . . . . .
ATT . . . . . . . . . . . . . . .
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.
Spectrum analyzer (E4402B-COM)
. . . . . 479.143 MHz
15 MHz
30 kHz
300 Hz
0.5 s (Meas Uncal)
0 dBm
10 dB
RTX100A ISDB-T RF Signal Generator Service Manual
50 Ω N(Ma)-to-SMA(Fe)
adapter