24
0 V
AF oscillator
EXT signal
20 Hz
RSSI output
waveform
Adjust so that they
synchronize at 0 V.
RSSI Waveform
TP1
TP4 (GND)
AF oscillator
Output : 20Hz
FM RF
signal generator
+
–
+
–
+
–
TP28 (SIG IN)
oscilloscope
(DC range)
TP4 (GND)
Carrier frequency : 43.780 MHz
Modulation : 20 Hz (EXT)
Deviation : AM 50%
Output level : 4 dB
µ
V (1.6
µ
V) (EMF)
TP1
TP4 (GND)
FM RF
signal generator
+
–
TP23 (SP)
TP22 (SP)
level meter
Carrier frequency : 43.780 MHz
Modulation : 1 kHz
Deviation : FM 3 kHz
Output level : 60 dB
µ
V (1 mV) (EMF)
+
–
TP7 (RX VT)
TP4 (GND)
digital voltmeter
+
–
TP103 (TX VT)
TP4 (GND)
digital voltmeter
HANDSET SECTION
Note:
• Apply 3.6 V dc from regurated DC power supply.
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
• Set to handset manual test mode. (Refer to page 19.)
TX SECTION ADJUSTMENT
TX VT Adjustment
Setting :
Procedure :
1. The digital voltmeter connected TP103 (TX VT) to TP4 (GND).
2. Adjust the L101 for 1.8 ± 0.1V reading on the digital voltmeter.
RX VT Adjustment
Setting :
Procedure :
1. Adjust the L4 for the maximam reading on the level meter.
RSSI Hi Adjustment
Note:
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
Setting :
Procedure :
1. The digital voltmeter connected TP7 (RX VT) to TP4 (GND).
2. Adjust the L3 for 2.5 ± 0.1 V reading on the digital voltmeter.
Procedure :
1. Use the oscilloscope to confirm the FM RF signal generator
input (AF) signal waveform and RSSI signal, and use the RV1
so that they are synchronized (duty is synchronized).
RX SECTION ADJUSTMENT
RX DISCRI Adjustment
Note:
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
Setting :
Adjustment Location : hand main board (See page 25.)
