Sony WRR-855B, Service Manual, Page: 20 / 84

3-4
WRR-855B
Step2: Adjustment
(1) Connect the tracking generator to the ANT IN A
connector of the TUN-8 board.
(2) Connect the spectrum analyzer to the CN102 connector
of the TUN-8 board using the RF adjustment cable.
(3) Set the tracking generator and spectrum analyzer as
follows:
Tracking generator setting
OUT PUT level: _ 30
±
0.1 dBm
Out put level setting is to be performed by connecting
the tracking generator directly to the spectrum analyzer.
Spectrum analyzer setting
CENTER FREQUENCY:
CE21 model; 482.000 MHz
CE33 model; 578.000 MHz
CE62 model; 810.000 MHz
CE67 model; 850.000 MHz
U14 model; 482.000 MHz
U30 model; 578.000 MHz
U42 model; 650.000 MHz
U62 model; 770.000 MHz
U66 model; 794.000 MHz
REF (Reference) LEVEL : _ 10 dBm
FREQUENCY SPAN : 50 MHz (5 MHz/DIV)
AMPLITUDE SCALE : 5 dB/DIV
ATT (Input attenuation) : 10 dB
RBW (Resolution per band width) : 100 MHz
VBW ( Video band width )
: 30 kHz
(4) Adjustment (ANT IN A side)
Specification : RF Amplifier gain = 11
±
1 dB
Band width (BW) =
±
12 MHz or
more (within 1 dB according to the
center frequency level)
Adjustment : Alternately
1
CT101, CT102, CT103
and CT104/TUN-8 board
(5) Connect the tracking generator to the ANT IN B
connector of the TUN-8 board.
(6) Connect spectrum analyzer to the CN402 connector of
the TUN-8 board.
(7) Adjustment (ANT IN B block)
Specification : The same as procedure (4) above.
Adjustment : Alternately
1
CT401, CT402, CT403
and CT404/TUN-8 board
Step3: Works after completing adjustment
After completing adjustment, turn off the main power of
the WRR-855B, and change the soldering bridge of the slit
land of the TUN-8 board as shown below. (
1
→
2
)
1
2 2
1
ANT IN A side ANT IN B side
ANT IN A ANT IN B
1 dB
BW
fc
f f
_
10 dBm
_ 19 dBm
RF amp gain
=11
± 1 dB
_ 30 dBm
H: 5 MHz/DIV
V: 5 dB/DIV
fc: 482.000 MHz (CE21 model)
578.000 MHz (CE33 model)
810.000 MHz (CE62 model)
850.000 MHz (CE67 model)
482.000 MHz (U14 model)
578.000 MHz (U30 model)
650.000 MHz (U42 model)
770.000 MHz (U62 model)
: 12 MHz and higher f
794.000 MHz (U66 model)