Pll And Transmitter Adjustments - Icom PMR446 Service Manual

5-2 PLL AND TRANSMITTER ADJUSTMENTS

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