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DX 979
CHAPTER 4
ALIGNMENT
4.0 REQUIRED TEST EQUIPMENT
c
DC Power Supply (13.8VDC, 10A)
d
RF Wattmeter (10W)
e
Multi-meter
f
Automatic Modulation Meter
g
Audio Signal Generator
h
Frequency Counter (100 MHz)
i
RF Signal Generator (100 MHz)
j
Automatic Distortion Meter
k
Oscilloscope (50 MHz)
l
Sinad Meter
4.1 ALIGNMENT PROCEDURES
This transceiver has been aligned at the factory and does not require any adjustments at installation.
The required test equipment listed are used for the test setup or alignment shown in Figure 4-1
Transmitter Test Setup and Figure 4-2 Receiver Test Setup. These test setups are used in part or total
during the following adjustments. Refer to page 15 for adjustment locations.
4.1.1 PLL ALIGNMENT
ITEM U.U.T.
SETTING
ADJUST
POINT
MEASUREMENT
VCO
Disconnect ‘short PCB’ from TP7, TP8 and TP9.
Set radio to CH 1 AM RX mode.
Connect Multi-meter to TP2.
L14
2.5 VDC
±
0.1
Set CLARIFIER Control to 12 o’clock.
Connect Oscilloscope to TP3.
L15
Adjust for max.
Connect Frequency Counter to IC3 Pin 8.
VC1
10.2400MHz
±
20Hz
AM
Frequency
Set radio to CH 19 AM RX mode.
Connect Frequency Counter to TP3.
L20
16.4900MHz
±
20Hz
USB
Frequency
Set radio to CH 19 USB RX mode.
Connect Frequency Counter to TP3.
L21
16.4925MHz
±
20Hz
LSB
Frequency
Set radio to CH 19 LSB RX mode.
Connect Frequency Counter to TP3.
L22
16.4875MHz
±
20Hz
TX Offset
Frequency
Set radio to CH 19 LSB TX mode.
Connect Frequency Counter to TP3.
VR7
16.4875MHz
±
20Hz
AM OSC
Set radio to CH 19 AM TX mode.
Connect Frequency Counter to TP5.
L23
10.6950MHz
±
10Hz
USB OSC
Set radio to CH 19 USB TX mode.
Connect Frequency Counter to TP5.
Set VR6 fully clockwise
L24
10.6925MHz
±
10Hz
LSB OSC
Set radio to CH 19 LSB TX mode.Connect
Frequency Counter to TP5.
Set VR6 back to mid position when finished.
L25
10.6975MHz
±
10Hz
Содержание DX 979
Страница 1: ...CB Radio Model DX 979 Service Manual Copyright Reserved...
Страница 11: ...10...
Страница 15: ...14 Figure 4 1 Transmitter test setup Figure 4 2 Receiver test setup...
Страница 19: ...18 DX 979 ROTARY SWITCH PCB EPT092920Z SMD COPPER SIDE COMPONENT SIDE...
Страница 21: ...20 DX 979 DISPLAY PCB EPT092930Z COMPONENT SIDE COMPONENT SIDE COPPER SIDE...
Страница 23: ...22 DX 979 DIM PWR MIC RF VOL SQ CONTROL VR PCB EPT092940Z COMPONENT SIDE COPPER SIDE...
Страница 26: ...25 DX 979 METER PCB EPT092961Z COMPONENT SIDE COPPER SIDE COPPER SIDE SMD...
Страница 29: ...28 DX 979 MAIN PCB EPT092913Z COMPONENTS SIDE...
Страница 30: ...29 DX 979 MAIN PCB EPT092913Z COPPER SIDE...
Страница 33: ...DX 979 SCHEMATIC DIAGRAM CONTROL PCB...
Страница 34: ...DX 979 SCHEMATIC DIAGRAM MAIN PCB...
Страница 35: ...DX 979 MECHANICAL PART DX 979 EXPLODE DRAWING...
Страница 38: ...ATS979010A July 2003...