Icom IC-821H - Pll Adjustment; Frequency Adjustment

5-2 PLL ADJUSTMENT
MEASUREMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
CONDITIONS VALUE
POINT
UNIT LOCATION UNIT ADJUST
REFERENCE 1
• MAIN band Ireq.
: Any PLL Connect an RF Maximum level PLL
L42, L43
FREQUENCY
• Preset C1 07 to the center position.
voltmeter (50 Q (More than
• Receiving
impedance) to J3 pin
1.
-22 dBm)
2
• MAIN band Ireq.
: Any Connect a Irequency 60.40000 MHz The trimmer
• Receiving
counter to J3 pin
1. capacitor 01
X1
VHF LOCK
1
• MAIN band Ireq.
: 145.000 MHz PLL Connect a digital 3.0V PLL L7
VOLTAGE
•
Mode
:FM multimeter to W11.
• Receiving
2
• MAIN band Ireq.
: 136.000 MHz 2.2 V ±0.5 V Verify
3
• MAIN band Ireq.
: 174.000 MHz
6.2
V ±0.5 V
4
• MAIN band Ireq.
: 145.000 MHz Connect an RF -10dBm±3dB
• Receiving
voltmeter (50 Q
impedance) to W11.
UHF
LOCK 1
• MAIN band Ireq.
: 440.000 MHz PLL Connect a digital 4.0V PLL C107
VOLTAGE
•
Mode
:FM multi meter to W13.
• Receiving
2
• MAIN band Ireq.
: 420.000 MHz 1.6 V ±0.5 V Verily
3
• MAIN band Ireq.
: 460.000 MHz 6.5 V ±0.5 V
4
• MAIN band Ireq.
: 440.000 MHz
Connect an RF
-9 dBm ±3 dB
• Receiving
voltmeter (50 Q
impedance) to W13.
5-3 FREQUENCY ADJUSTMENT
MEASUREMENT
,
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
CONDITIONS
VALUE
POINT
UNIT LOCATION
UNIT ADJUST
FM TX-LO 1
• MAIN band Ireq.
: Any
MAIN Connect a Irequency 10.85000 MHz
MAIN L18
FREQUENCY
• Mode
:FM counter to J27.
• Transmitting
5-2