Sony UWP-V1, Service Manual

Page: 85 / 164

2-65
UWP Series
MB-1094 board (A side)
CN101
MM-SMA conversion connector
SMA-BNC conversion connector
Spectrum analyzer
MB-1094 board (A side)
CN101
MM-SMA conversion connector
SMA-BNC conversion connector
Frequency
counter
Modulation
analyzer
RF IN AF UOT
Frequency check
Connections
(For connecting the DC power supply, refer to step
“3. Connecting the DC power supply” in Section 2-6-2.)
Procedure
n
Perform the checking with the AF INPUT connector short-
circuit.
1. Set the modulation analyzer as below:
MEASUREMENT : FM
MEASUREMENT RANGE :
±
40 kHz
HPF : 4 kHz
LPF : >20 kHz
DE EMPHASIS : OFF
2. Check that the frequency counter (resolution : 0.1 Hz
setting) reading is 32.000 kHz
±
1Hz.
Frequency deviation adjustment
Connections
(For connecting the DC power supply, refer to step
“3. Connecting the DC power supply” in Section 2-6-2.)
Procedure
1. Connect the spectrum analyzer to the antenna terminal
(CN101) via the MM-SMA conversion connector and
the SMA-BNC conversion connector.
2. Set the spectrum analyzer as below:
CENTER FREQUENCY (fc)
U30 model : 578.125 MHz
U42 model : 650.125 MHz
U6264 model : 770.125 MHz
U6668 model : 794.125 MHz
CE62 model
: 810.000 MHz
CE67 model : 850.000 MHz
REFERENCE LEVEL : 20 dBm
FREQUENCY SPAN : 200kHz (20 kHz/DIV)
RBW (resolution band width) : 3kHz
VBW (video band width)
: 1kHz
ATT : 20 dB
3. Adjust 1 RV103/MB-1094 board (A side) so that level
between carrier frequency (frequency center level) on
spectrum analyzer and tone signal is within 29 dB
±
1 dB.
fc
32.000 kHz
29 ± 1 dB
20 dBm
v:10 dB/div
H:20 MHz/div