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4-1.
BASE UNIT SECTION
• Make the set in Test Mode. (See page 11.)
TX adjustment and check
1. TX VCO adjustment
Setting:
digital voltmeter
+
–
Procedure:
1) Connect a digital voltmeter to TP (TX VCO) and TP (GND).
2) Adjust L11 so that TX VCO value (DC voltage) is 2.8 ± 0.05
V.
2. Power check
Setting:
power meter
+
–
Procedure:
1) Connect a power meter to TP (ANT) and TP (GND).
2) Check the level of power meter is –9.5 ± 3.0 dBm.
3. Frequency check
Setting:
frequency counter
+
–
Procedure:
1) Connect a frequency counter to TP (ANT) and TP (GND).
2) Check the value of frequency counter is 46.77 MHz ± 1.2 kHz.
4. RX VCO adjustment
Setting:
digital voltmeter
+
–
Procedure:
1) Connect a digital voltmeter to TP (RX VCO) and TP (GND).
2) Adjust L4 so that RX VCO value (DC voltage) is 1.4 ± 0.05 V.
5. Modulation sensitivity check
Setting:
deviation meter
+
–
AF OSC
ATT
+
+
–
–
SECTION 4
ELECTRICAL ADJUSTMENTS
TP (TX VCO)
TP (GND)
TP (ANT)
TP (GND)
TP (ANT)
TP (GND)
TP (RX VCO)
TP (GND)
TP (ANT)
TP (GND)
600 Ω
J3
+
(LINE jack)
–
1 kHz, –19 dBm
Procedure:
1) Connect a deviation meter to TP (ANT) and TP (GND).
[INTERCOM]
2) Press the
3) Set level of AF OSC to 1 kHz –19 dBm.
4) Check the value of deviation meter is ± 2.25 kHz to ± 3.95
kHz.
6. Data deviation check
Setting:
deviation meter
Procedure:
1) Connect a deviation meter to TP (ANT) and TP (GND).
[INTERCOM]
2) Press the
3) Check the value of deviation meter is ± 3.75 kHz to ± 6.75
kHz.
7. Channel change check
Setting:
frequency counter
Procedure:
1) Connect a frequency counter to TP (ANT) and TP (GND).
[HOLD]
2) Press the
3) Check the value of frequency counter. (For specified value,
see page14.)
RX adjustment and check
1. RX VCO Voltage check
Setting:
SSG
Carrier frequency: 49.83 MHz
Modulation: 1 kHz, ± 3 kHz deviation
Output level: no. output
digital voltmeter
+
–
Procedure:
1) Connect a digital voltmeter to TP (RX VCO) and TP (GND).
2) Set the SSG.
[INTERCOM]
3) Press the
4) Check the voltage of digital voltmeter is 1.4 ± 0.1 V.
– 15 –
button.
+
TP (ANT)
–
TP (GND)
button.
+
TP (ANT)
–
TP (GND)
button.
TP (ANT)
TP (GND)
TP (RX VCO)
TP (GND)
button 4 times.
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