Table of Contents
Advertisement
BASE UNIT SECTION
Note:
• Apply 9V dc from regurated DC power supply.
• Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule.
• Set to base unit machine test mode. (Refer to page 12.)
• Switch position :
S802 (DIAL MODE) : P (pulse)
TX SECTION ADJUSTMENT
• The electrolytic capacitor (10 µF/10 V) connected TP505 (DET
OUT) to TP506 (GND). (Only TX section adjustment)
TX VT Adjustment
Setting :
digital voltmeter
+
–
Procedure :
1. The digital voltmeter connected TP603 (TX VT) to TP506
(GND).
2. Adjust the L602 for 1.1 ± 0.1 V reading on the digital voltmeter.
RX VT Adjustment
Setting :
digital voltmeter
+
–
Procedure :
1. The digital voltmeter connected TP503 (RX VT) to TP506
(GND).
2. Adjust the L503 for 4.0 ± 0.1 V reading on the digital voltmeter.
Power Level Adjustment
Note:
• Connect a resistor of 50 Ω between TP502 and TP508 on Base
main board before adjustment. (See page 18.)
After adjustment, remove the resistor.
Setting:
modulation
analyzer
+
–
Procedure:
1. The modulation analyzer connected TP502 to TP508 (GND).
2. Adjust the RV601 for 280 µW reading on the modulation
analyzer.
SECTION 4
ELECTRICAL ADJUSTMENTS
TP603 (TX VT)
TP506 (GND)
TP503 (RX VT)
TP506 (GND)
TP502
TP508 (GND)
– 17 –
RX SECTION ADJUSTMENT
RX DISCRI Adjustment
Note:
• Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule.
Setting :
FM RF
signal generator
Carrier frequency : 49.910 MHz
Modulation
Deviation
Output level
level meter
+
–
600 Ω
PBX tester
or
DC 48V
F.B.
Procedure :
1. Adjust the FL501 for the maximam reading on the level meter.
Also check that the output level is the specified values.
Specified Value : –2.6 to –10.6 dBV
RSSI Hi Adjustment
Note:
• Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule.
Setting :
FM RF
AF oscillator
signal generator
Output: 20 Hz
Carrier frequency : 49.910 MHz
Modulation
Deviation
Output level
oscilloscope
(DC range)
+
TP507 (SIG OUT)
–
TP506 (GND)
Procedure :
1. Use the oscilloscope to confirm the FM RF signal generator
input (AF) signal waveform and RSSI signal, and use the RV501
so that they are synchronized (duty is synchronized).
RSSI output waveform
0 V
Adjust so that they
synchronize at 0 V.
RSSI WAVEFORM
Adjustment Location : base main board (See page 18.)
TP502
TP508 (RF GND)
: 1 kHz
: FM 3 kHz
: 60 dB µ V (1 mV) (EMF)
TP702
TP701
TP502
TP508 (RF GND)
: 20 Hz (EXT)
: AM 50%
: 17 dB µ V (7.1 µ V) (EMF)
RF signal EXT
signal 20 Hz
Advertisement
Table of Contents
