Required Test Equipment; Alignment Procedures; Pll Alignment - Galaxy DX 979 Service Manual

DX 979

4.0 REQUIRED TEST EQUIPMENT

DC Power Supply (13.8VDC, 10A)
RF Wattmeter (10W)
Multi-meter
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 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
VCO Disconnect 'short PCB' from TP7, TP8 and TP9.
Set radio to CH 1 AM RX mode.
Connect Multi-meter to TP2.
Set CLARIFIER Control to 12 o'clock.
Connect Oscilloscope to TP3.
Connect Frequency Counter to IC3 Pin 8.
AM Set radio to CH 19 AM RX mode.
Frequency Connect Frequency Counter to TP3.
USB Set radio to CH 19 USB RX mode.
Frequency Connect Frequency Counter to TP3.
LSB Set radio to CH 19 LSB RX mode.
Frequency Connect Frequency Counter to TP3.
TX Offset Set radio to CH 19 LSB TX mode.
Frequency Connect Frequency Counter to TP3.
AM OSC Set radio to CH 19 AM TX mode.
Connect Frequency Counter to TP5.
USB OSC Set radio to CH 19 USB TX mode.
Connect Frequency Counter to TP5.
Set VR6 fully clockwise
LSB OSC Set radio to CH 19 LSB TX mode.Connect
Frequency Counter to TP5.
Set VR6 back to mid position when finished.
U.U.T. SETTING
- 11 -
ALIGNMENT
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
CHAPTER 4
MEASUREMENT
2.5 VDC ± 0.1
Adjust for max.
10.2400MHz ± 20Hz
16.4900MHz ± 20Hz
16.4925MHz ± 20Hz
16.4875MHz ± 20Hz
16.4875MHz ± 20Hz
10.6950MHz ± 10Hz
10.6925MHz ± 10Hz
10.6975MHz ± 10Hz