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DX 2547
CHAPTER 4
ALIGNMENT
4.0 REQUIRED TEST EQUIPMENT
c
DC Power Supply (13.8VDC, 10A)
d
RF Wattmeter (100 MHz, 50W)
e
Multimeter (Digital)
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 is used for the test setup or alignment shown in Figure 4-1
Transmitter Test Setup and Figure 4-2 Receiver Test Setup. This test setup is used in part or total
during the following adjustments. Refer to Page 43 for adjustment location.
4.1.1 PLL ALIGNMENT
ITEM U.U.T.
SETTING
ADJUST
POINT
MEASUREMENT
Regulator
Voltage
Connect Voltmeter positive lead to power switch.
Connect Voltmeter negative lead to PCB ground.
VR701
13.8 VDC
VCO
Disconnect ‘short PCB’ from TP7, TP8 and TP9.
Set radio to CH 1 AM RX mode.
Connect Voltmeter 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 1 AM RX mode.
Connect Frequency Counter to TP3.
L20
16.2700MHz
±
20Hz
USB Frequency Set radio to CH 1 USB RX mode.
Connect Frequency Counter to TP3.
L21
16.2725MHz
±
20Hz
LSB Frequency Set radio to CH 1 LSB RX mode.
Connect Frequency Counter to TP3.
L22
16.2675MHz
±
20Hz
TX Offset
Frequency
Set radio to CH 1 AM TX mode.
Connect Frequency Counter to TP3.
VR7
16.2675MHz
±
20Hz
AM OSC
Set radio to CH 1 AM TX mode.
Connect Frequency Counter to TP5.
L23
10.6950MHz
±
10Hz
USB OSC
Set radio to CH 1 USB TX mode.
Connect Frequency Counter to TP6.
L24
10.6925MHz
±
10Hz
LSB OSC
Set radio to CH 1 LSB TX mode.
Connect Frequency Counter to TP6.
L25
10.6975MHz
±
10Hz
4.1.2 TRANSMITTER ALIGNMENT
Содержание DX 2547
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Страница 17: ...17 Figure 4 1 Transmitter test setup Figure 4 2 Receiver test setup...
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Страница 39: ...39 DX 2547 MAIN PCB...
Страница 43: ...43 Main PCB Adjustment Location...