Galaxy DX 959 Service Manual

Also see for DX 959: Owner's manual

Contents

Galaxy DX 959 Service Manual Manual pdf 15 page image

- 14 -DX 959CHAPTER 4ALIGNMENT4.0 REQUIRED TEST EQUIPMENTc DC Power Supply (13.8VDC, 10A)d RF Wattmeter (25~60 MHz, 25W)e Multimeterf Automatic Modulation Meterg Audio Signal Generatorh Frequency Counter (100 MHz)i RF Signal Generator (100 MHz)j Automatic Distortion Meterk Oscilloscope (50 MHz)l Sinad Meter4.1 ALIGNMENT PROCEDURESThis 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 4-1Transmitter Test Setup and Figure 4-2 Receiver Test Setup. This test setup is used in part or totalduring the following adjustments and refers to Figure 4-3 for adjustment location.4.1.1 PLL ALIGNMENTITEM U.U.T. SETTING ADJUSTPOINTMEASUREMENTVCO Voltage Disconnect the “short PCB” from TP7,TP8 and TP9. Set radio to CH 1 AM RXmode. Clarifier setting in 12 o’clock.Connect Oscilloscope to TP3.Set radio to CH 1 AM RX mode.Connect frequency counter IC3 Pin 8.L14L15VC12.6 VDC ± 0.1Maximum Output10.24000 MHz + 20 HzAMFrequencySet radio to CH 1 AM RX mode.Connect frequency counter to TP3.L20 16.27000 MHz + 20 HzUSB Freq. Set radio to CH 1 USB mode.Connect frequency counter to TP3.L21 16.27250 MHz + 20 HzLSB Freq. Set radio to CH 1 LSB mode.Connect frequency counter to TP3.L22 16.26750 MHz + 20 HzTX FrequencyOffset.Set radio to CH 1 LSB TX mode.Connect frequency counter to TP3VR7 16.26750 MHz + 20 HzAM OSC Set radio to CH 1 AM TX mode.Connect frequency counter to TP5L23 10.69500 MHz + 20 HzUSB OSC Set radio to CH1 USB TX mode. Set VR6fully clockwise. Connect frequencycounter to TP5.L24 10.69250 MHz + 20 HzLSB OSC Set radio to CH 1 LSB TX mode. Connectfrequency counter to TP5. Connect scopeto TP5 and adjust VR6 for minimumsignal.L25 10.69750 MHz + 20 Hz