Alignment; Required Test Equipment; Alignment Procedures; Pll Alignment - Galaxy DX 959 Service Manual

DX 959

4.0 REQUIRED TEST EQUIPMENT

DC Power Supply (13.8VDC, 10A)
RF Wattmeter (25~60 MHz, 25W)
Multimeter
Automatic Modulation Meter
Audio Signal Generator

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 and refers to Figure 4-3 for adjustment location.

4.1.1 PLL ALIGNMENT

ITEM U.U.T. SETTING
VCO Voltage Disconnect the "short PCB" from TP7,
TP8 and TP9. Set radio to CH 1 AM RX
mode. Clarifier setting in 12 o'clock.
Connect Oscilloscope to TP3.
Set radio to CH 1 AM RX mode.
Connect frequency counter IC3 Pin 8.
AM Set radio to CH 1 AM RX mode.
Frequency Connect frequency counter to TP3.
USB Freq. Set radio to CH 1 USB mode.
Connect frequency counter to TP3.
LSB Freq. Set radio to CH 1 LSB mode.
Connect frequency counter to TP3.
TX Frequency Set radio to CH 1 LSB TX mode.
Offset. Connect frequency counter to TP3
AM OSC Set radio to CH 1 AM TX mode.
Connect frequency counter to TP5
USB OSC Set radio to CH1 USB TX mode. Set VR6
fully clockwise. Connect frequency
counter to TP5.
LSB OSC Set radio to CH 1 LSB TX mode. Connect
frequency counter to TP5. Connect scope
to TP5 and adjust VR6 for minimum
signal.
Frequency Counter (100 MHz)
RF Signal Generator (100 MHz)
Automatic Distortion Meter
Oscilloscope (50 MHz)
Sinad Meter
ADJUST
POINT
L14
L15
VC1
L20
L21
L22
VR7
L23
L24
L25
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CHAPTER 4

ALIGNMENT

MEASUREMENT
2.6 VDC ± 0.1
Maximum Output
10.24000 MHz + 20 Hz
16.27000 MHz + 20 Hz
16.27250 MHz + 20 Hz
16.26750 MHz + 20 Hz
16.26750 MHz + 20 Hz
10.69500 MHz + 20 Hz
10.69250 MHz + 20 Hz
10.69750 MHz + 20 Hz