Icom PMR446, Руководство по обслуживанию

Страница: 11 / 27

5 - 3
REFERENCE
FREQUENCY
OUTPUT
POWER
FM
DEVIATION
5-2 PLL AND TRANSMITTER ADJUSTMENTS
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
466.00625 MHz
470 mW
±2.45 kHz
10 mV ±3dB
1
1
1
2
• Operating channel : Ch 01
• Transmitting
• Operating channel : Ch 01
• Transmitting
• Operating channel : Ch 01
• Set group No.
: 01
• Connect an audio generator to the
[MIC] jack and set as:
1 kHz/100 mV rms
• Set an FM deviation meter as:
HPF : OFF
LPF : 20 kHz or 15 kHz
De-emphasis : OFF
Detector
: (P–P)/2
• Transmitting
• Set group No. : OFF (– –)
• Set an audio generator output level
until the deviation is ±1.75 kHz.
• Transmitting
Top
panel
RF
RF
Loosely couple a fre-
quency counter to the
antenna.
Connect an RF power
meter to the RF test
port J1.
Connect an FM devia-
tion meter to the RF
test port J1.
RF
RF
RF
C63
R206
R50
Verify
RF
GND
J1
RF test port
R50
FM deviation adjustment
Reference frequency
adjustment
R206
Output power
adjustment
TEST
C63