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GEX-P900DAB
Equipment required:
• Head unit
• SG: Capable of outputting sine waves up to 1.5 GHz (no modulation function is required)
• DMM
• Adjustment stick (with flat tip)
1. VCO ADJUSTMENT
1) Connect the GEX-P900DAB to a DC regulated power supply. Connect the head unit and the GEX-P900DAB with an
IPBUS cable.
2) Set the power to ON, and enter DAB Service mode.
3) Set frequency to 13 F.
4) Check R556 on the side where P1 is located (the side not in contact with D551) with DMM (1) so that VT (tuning
voltage) can be measured. Adjust air-core coil (L553) so that VT is 7.00 V.
5) Set frequency to 5 A, and confirm that VT is within the range from 1.2 to 1.7 V.
L473
Pin 7
DMM(2)
L503
L475
L477
L505
L507
L553
R556
IC391
DMM(1)
MAIN UNIT
35
6. ADJUSTMENT
-
Connection Diagram
Содержание CRT2193
Страница 4: ...4 GEX P900DAB 2 2 EXTERIOR ...
Страница 8: ...8 GEX P900DAB DIGITAL SECTION A 3 3 A 1 2 3 4 B C D 1 2 3 4 A a A b A a 1 3 ...
Страница 9: ...9 GEX P900DAB SYSTEM CONTROL RF SECTION A 2 3 5 6 7 8 A B C D 5 6 7 8 A a A b A a 1 3 ...
Страница 10: ...10 GEX P900DAB SELECTOR ISOLATOR MUTE POWER SUPPLY ASENSE BSENSE A 1 2 3 4 B C D 1 2 3 4 A a A b A b 1 3 ...
Страница 11: ...11 GEX P900DAB POWER SUPPLY ASENSE BSENSE POWER SUPPLY CEK1033 1 4mH 5 6 7 8 A B C D 5 6 7 8 A a A b A b 1 3 ...
Страница 14: ...14 GEX P900DAB BAND3 RF AMP L BAND RF AMP ANT DUMP POWER SUPPLY PLL A 1 2 3 4 B C D 1 2 3 4 A a A b A a 2 3 ...
Страница 15: ...15 GEX P900DAB L BAND DOWN CONVERTOR 5 6 7 8 A B C D 5 6 7 8 A a A b A a 2 3 ...
Страница 16: ...16 GEX P900DAB 2nd MIXER 1st MIXER PLL SL SAW FILTER NULL DETECTOR A 1 2 3 4 B C D 1 2 3 4 A a A b A b 2 3 ...
Страница 17: ...17 GEX P900DAB DIGITAL SECTION A 3 3 A 1 3 5 6 7 8 A B C D 5 6 7 8 A a A b A b 2 3 ...
Страница 20: ...20 GEX P900DAB DAB DECODER RF SECTION A 2 3 A 1 2 3 4 B C D 1 2 3 4 A a A b A a 3 3 ...
Страница 23: ...23 GEX P900DAB SELECTOR DAC OPT IN OUT A 1 3 5 6 7 8 A B C D 5 6 7 8 A a A b A b 3 3 ...
Страница 24: ...A MAIN UNIT 24 GEX P900DAB A 1 2 3 4 B C D 1 2 3 4 4 PCB CONNECTION DIAGRAM 4 1 MAIN UNIT A ...
Страница 26: ...26 GEX P900DAB A 1 2 3 4 B C D 1 2 3 4 A MAIN UNIT A ...
Страница 27: ...27 GEX P900DAB 5 6 7 8 A B C D 5 6 7 8 SIDE B A ...
Страница 42: ...42 GEX P900DAB AK4321VFP TC74HC126AF TC74HCT541AF ...
Страница 59: ...59 GEX P900DAB 7 3 2 BLOCK DIAGRAM A ...