WRT-800A (AU)
Connections
(For connecting the DC power supply, refer to the “Prepa-
rations” on page 3-3.)
Procedure
(1) Connect the audio analyzer (distortion analyzer) to the
AF OUT connector for the modulation analyzer.
(2) Set the audio analyzer to distortion measurement
(DISTORTION mode).
(3) Input 1 kHz,
_
43.5 dBV(
_
41.3 dBm) signal to the
CN101/AU-258 board from audio analyzer (oscillator)
with AF input connector.
n
0 dBV=1 Vrms, 0 dBm=0.775 Vrms
(4) Check that the distortion analyzer reading is less than
0.9 %.
Level meter
Audio analyzer
Oscillator
AF input connector
CN101
(B side)
SMA-BNC
conversion connector
Modulation analyzer
RF-87 Board
(B side)
AU-258 Board
(A side)
Audio analyzer
Distortion
analyzer
Oscilloscope
RF adjusting connector
3-6
Procedure
(1) Input 10 kHz,
_
7.5 dBV(
_
5.3 dBm) signal to the
CN101/AU-258 board with AF input connector.
(2) Adjust
1
RV102 so that the frequency deviation for the
modulation analyzer reading meets the following
specification.
Specification :
Frequency deviation = maximum
Adjustment :
1
RV102/AU-258 board (A side)
(3) Input 1 kHz,
_
7.5 dBV(
_
5.3 dBm) signal to the
CN101/AU-258 board with AF input connector.
(4) Adjust
1
RV101 so that the frequency deviation for the
modulation analyzer reading meets the following
specification.
Specification :
Frequency deviation =
±
26 kHz
±
0.5 kHz
Adjustment :
1
RV101/AU-258 board (A side)
(5) Adjust
1
RV102 so that the frequency deviation for the
modulation analyzer reading meets the following
specification.
Specification :
Frequency deviation =
±
24.5 kHz
±
0.5 kHz
Adjustment :
1
RV102/AU-258 board (A side)
3-2-5. Distortion Ratio Check
Equipment and Tools
DC power supply
DC output voltage:
+
1.5
±
0.1 Vdc
DC current meter
Audio analyzer
Modulation analyzer
MEASUREMENT
: FM
MEASUREMENT RANGE : AUTO or
±
40 kHz
HPF
: 50 Hz
LPF
: 20 kHz or 15 kHz
DE EMPHASIS
: 50
u
s
Oscilloscope
AF input connector (See page 3-2.)
RF adjusting connector (See page 3-2.)
Switch and control setting
S301, S302, S303, S304/ RF-87 board (A-side)
WRT-800A
S301
S302
S303
S304
Channel
setting
AU66 model
_
0
1
OFF
67-01
