Icom IC-R7000 - 6-2 PLL Adjustment

6·2 PLL ADJUSTMENT
INSTRUMENTS REQUIRED
CONNECTIONS
(1) FREQUENCY COUNTER
•
FREQUENCY RANGE : 0.1 MHz-1.3GHz
•ACCURACY
: BETTER THAN ± 1 ppm
FREQUENCY 11
RF VOLT- I
I OSCILL0· 11
VOLT-
• SENSITIVITY
: 100mV OR BETTER
COUNTER METER
SCOPE
METER
(2) RF VOLTMETER
!TO J6
• MEASURING RANGE : AT LEAST 500MHz
!To R139
(3) OSCILLOSCOPE
TO L22, L35
• FREQUENCY RANGE : DC-50MHz
TO J6, J2
B
• MEASURING RANGE
:
o.01-10v
::-
(4) VOLTMETER
• INPUT IMPEDANCE
: 50k0/DC OR BETTER
MEASUREMENT
ADJUSTMENT
POINT
ADJUSTMENT ADJUSTMENT CONDITIONS VALUE
UNIT LOCATION
UNIT ADJUST
LO (36MHz) 1 •Mode: any
PLL
Connect an Maximum (More than
PLL
L29, L30
OUTPUT
oscilloscope to
100mVp-p)
LEVEL
R139.
MULTIPLIER
1 • Display freq.: 249.9999 MHz
Connect a
Minimum (5-6V)
L18,L19,
(Q10, Q11)
voltmeter to L22. L20, L21,
OUTPUT
L40
LEVEL
MULTIPLIER
1 • Display freq.: 250.0000 MHz
Connect a
Minimum (5-6V) L31, L32,
(Q16, Q18)
voltmeter to L35. L33, L34
OUTPUT
LEVEL
2nd LO
1 •Display freq.: 512.0000MHz
Connect a
Maximum L41, L42,
OUTPUT
spectrum analyzer
(Approx. OdBm/0.22V)
L43, L44,
LEVEL
or RF voltmeter to
L49
J6.
2 •Display freq.: 511.9999MHz
L46, L48
NOTE: If measured value is not within -2dBm-+3dBm (0.18V-0.32V), repeat steps 1 and 2.
2nd LO 1 • Display freq.: 511.9999 MHz PLL
Connect a
768.0000 MHz
PLL
L39
OUTPUT frequency counter
FREQUENCY
2 • Display freq.: 512.0000 MHz
to J6.
256.0000 MHz
Verify
1st LO
1 •Mode: FM
Connect a 923.7000MHz R58
OUTPUT
•Display freq.: 145.0000 MHz frequency counter
FREQUENCY to J2.
2
•Display freq.: 149.9999MHz
923.6999 MHz
R49
NOTE: Repeat steps 1 and 2.
3
•Mode: SSB
PLL Connect a 923.6985 MHz PLL R22
• USB/LSB SELECTOR SWITCH: frequency counter
LSB
to J2.
•Display freq.: 145.0000MHz
4 • USB/LSB SELECTOR SWITCH:
923.7015MHz R21
USB
•Display freq.: 145.0000 MHz
6-2