3-11
WRT-808A (U)
3-2-10. Frequency Characteristics Check
Equipment and Tools
DC power supply
DC output Voltage:
+
3.0
±
0.1 V dc
DC ammeter
Audio analyzer
Modulation analyzer
MEASUREMENT:
FM
MEASUREMENT RANGE:
±
40 kHz
HPF:
OFF
LPF:
OFF
DE EMPHASIS:
50
u
s
Oscilloscope
MM-SMA (J) connector (Part No. J-6402-480-A)
SMA-BNC (J) connector (Part No. J-6402-490-A)
Connections
Same as “3-2-6. Distortion Ratio Check”.
Switch and Control Setting
The following setting is to be perform with the channel se-
lect switches (S504 and S505).
Transmitting Channel setting:
U64 model:
65-01 channel (776.125 MHz)
U66 model:
67-01 channel (788.125 MHz)
U68 model:
69-01 channel (800.125 MHz)
RF power output switch (S401): 50 mW
Input LEVEL control (RV101): “
_
60” (0 dB attenuation)
Turn the RV101 clockwise
fully.
Procedure
(1) Connect the audio analyzer (level meter) to the AF OUT con-
nector for the modulation analyzer.
(2) Set the audio analyzer to level meter mode.
(3) Input 1 kHz,
_
60 dBV (
_
57.8 dBm) signal to the Mic input
connector (CN101) from audio analyzer (oscillator).
(4) Reads the indication on the audio analyzer (level meter) .
(5) Set the SENSITIVITY on the audio analyzer (level meter) so
that the audio analyzer (level meter) reads 0 dB.
(6) Switch the oscillation frequency for the audio analyzer (os-
cillator) from 1 kHz to 100 Hz.
(7) Check that audio analyzer (level meter) reading is 0
±
1.0 dB.
(8) Next, switch the oscillation frequency for the audio analyzer
(oscillator) from 100 Hz to 10 kHz.
(9) Check that the reading for the audio analyzer (level meter) is
_
1.0
±
1.0 dB.
3-2-11. Tone Signal Adjustment
Equipment and Tools
DC power supply
DC output Voltage:
+
3.0
±
0.1 V dc
DC ammeter
Frequency counter
Spectrum analyzer
Modulation analyzer
MM-SMA (J) connector (Part No. J-6402-480-A)
SMA-BNC (J) connector (Part No. J-6402-490-A)
Switch and Control Setting
The following setting is to be perform with the channel se-
lect switches (S504 and S505).
Transmitting Channel setting:
U64 model: 65-01 channel (776.125 MHz)
U66 model: 67-01 channel (788.125 MHz)
U68 model: 69-01 channel (800.125 MHz)
RF power output switch (S401): 50 mW
Input LEVEL control (RV101): “
_
60” (0 dB attenuation)
Turn the RV101 clockwise
fully.
1. Frequency deviation adjustment
Connections
(For connecting the DC power supply, refer to the “Preparations”
on page 3-2.)
2
1
Short-circuit
XLR 3Pin (male)
- wiring side -
3
MM-SMA (J) connector
with SMA-BNC (J) connector
CN402
Spectrum
analyzer