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Encoder Board NTSC
I / Q 90° phase
16. Connect MP7 on the encoder board to ground.
17. With the phase potentiometer on the vectorscope, place the I vectors along the I-axis of the graticule.
Measure at:
Adjust with:
18. On the encoder board disconnect MP7 from ground and connect MP8 to ground.
19. Adjust the phase of the Q vectors with L8 so that they lie along the Q-axis of the graticule.
Measure at:
Adjust with:
CVBS out
L8
20. Repeat steps 16. to 20. until the best results are obtained.
BURST ADJUSTMENTS
Burst phase
21. Adjust the burst phase potentiometer to place the burst vector along the horizontal axis
Measure at:
Adjust with:
CVBS out
ZR211
Burst amplitude
22. Adjust the burst amplitude potentiometer to obtain a burst amplitude of 286mV (40 IRE).
Measure at:
Adjust with:
CVBS out
ZR210
Adjustments
Required result:
Correct:
IRE
120
100
80
60
40
20
20
40
Required result:
Correct:
IRE
120
100
80
60
40
20
20
40
Required result:
Correct:
IRE
120
100
80
60
40
20
20
40
Required result:
Correct:
286mV
100
(40 IRE)
90
10
0%
Technical Manual LDK 20(S) - Studio Camera
0%
12.5%
R
I
MG
Q
5
YL
75 100
0
B
-5
75%
G
CY
100%
0%
12.5%
R
I
MG
Q
5
YL
75 100
0
B
-5
75%
G
CY
100%
0%
12.5%
R
I
MG
Q
5
YL
75 100
0
B
-5
75%
G
CY
100%
0.1V
2µS
VA+286mV
4-47
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