Pll Adjustment - Icom IC-R2 Service Manual

5-2 PLL ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
1ST VCO
1 • Displayed frequency :
LOCK
VOLTAGE • Receiving
(SHIFT ON)
2 • Displayed frequency :
• Receiving
(SHIFT OFF)
1 • Displayed frequency :
• Receiving
2 • Displayed frequency :
• Receiving
2ND VCO
1 • Displayed frequency :
LOCK
VOLTAGE • Receiving
2 • Displayed frequency :
• Receiving
REFERENCE
1 • Displayed frequency :
FREQUENCY
• Receiving
DETECTOR
1 • Displayed frequency :
OUTPUT
VOLTAGE
• Connect an SSG to the antenna
connector and set as:
Level
Deviation : ± 3.5 kHz
Modulation : 1 kHz
• Receiving
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
493.300 MHz
282.900 MHz
0.495 MHz
493.295 MHz
430.000 MHz
493.300 MHz
(FR ch) 280.100 MHz
(tk ch) 145.600 MHz
: 1 mV (60 dBµ)
*
MEASUREMENT
UNIT LOCATION
RF Connect the digital
multi-meter to the
check point LV1.
RF Connect the digital
multi-meter to the
check point LV2.
RF Connect the fre-
quency counter to
the check point F.
RF Connect the digital
multi-meter to check
point QUAD.
5 - 3
ADJUSTMENT
VALUE
UNIT
1.9 V – 2.9 V
less than 12 V
1.4 V – 2.4 V
less than 12 V
0.4 V – 1.0 V
less than 2.5 V
546.7999 MHz – LOGIC
546.8001 MHz
1.0 V RF
POINT
ADJUST
Verify
[DIAL]
L21