Pll And Transmitter Adjustments - Icom IC-2710H Service Manual

5-2 PLL AND TRANSMITTER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITIONS
PLL 1 •VHF display: 145.000 MHz
LOCK •Receiving
VOLTAGE
2 • UHF display: 145.000 MHz
•Receiving
PLL 1 • UHF display: 440.000 MHz
REFERENCE· •Simplex
FREQUECY • Transmitting
VHF 1 •VHF display:
OUTPUT 146.000 MHz (USA, SEA versions)
POWER 145.000 MHz (All other versions)
•[HI/LOW) switch: HI
•Simplex
• Transmitting
2 •[HI/LOW) switch: Mid. (Low*)
•[HI/LOW) switch: Low
3
• UHF display:
UHF 1
OUTPUT 445.000 MHz (USA version only)
435.000 MHz (All other versions)
POWER
•[HI/LOW) switch: HI
•Simplex
• Transmitting
2 [HI/LOW) switch: Mid. (Low*)
[HI/LOW] switch: Low
3
FREQUENCY 1 •VHF display:
DEVIATION 146.000 MHz (USA, SEA versions)
145.000 MHz (All other versions)
• Connect an audio generator to the
microphone connector and set as;
20 mV/1.0 kHz
• Set an FM deviation meter as;
HPF
LPF
De-emphasis : OFF
Detector
• [HI/LOW] switch: HI
• [CTCSS tone: OFF
•Simplex
• Transmitting
2 •UHF display:
445.000 MHz (USA version only)
435.000 MHz ( All other versions)
MEASUREMENT
UNIT
MAIN
Rear
panel
Rear Connect an RF power
panel
Rear
panel meter to the antenna
Rear
panel deviation meter to the
: 50 Hz
: 20 kHz
: (P - P)/2
5- 2
LOCATION
Connect a digital 2.3 V
multi-meter or an
oscilloscope to the
CP-LW.
Connect a digital 1.5
multi-meter or an
oscilloscope to the
CP-LVU.
Loosely couple a 440.000 MHz
frequency counter to
the antenna
connector.
so w
meter to the antenna
connector.
5-20 W
2-10W
Connect an RF power 35 W
connector.
5-20 W
2-10 W
Connect an FM ±4. 8 kHz
antenna connector
through an attenuator.
ADJUSTMENT
VALUE
UNIT ADJUST
MAIN L23
v
L118
MAIN C48 0
MAIN R139
Verify
MAIN R142
Verify
MAIN R61
R28 9