Galaxy DX 959 Service Manual
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Galaxy DX 959 Service Manual

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Summary of Contents for Galaxy DX 959

  • Page 2: Table Of Contents

    TABLE OF CONTENTS DX 959 CHAPTER 1 PAGE SPECIFICATIONS General..........

  • Page 3: Specifications

    DX 959 SPECIFICATIONS 1.0 GENERAL Model DX 959 Frequency Range 26.965 - 27.405MHz. Emission Modes AM/USB/LSB Frequency Control Phase Lock Loop (PLL) synthesizer. ± 0.005 %. Frequency Tolerance ± 0.001 %. Frequency Stability Operating Temperature Range -30°C to +50°C. Microphone Plug-in dynamic;...

  • Page 4: Control & Connections

    Figure 2-1 Front Panel 2.0 INTRODUCTION This section explains the basic operating procedures for the Galaxy DX 959 mobile transceiver. 2.1 CONTROL AND CONNECTIONS 2.1.1 FRONT PANEL Refer to the above Figure 2-1 for the location of the following controls.
  • Page 5 The radio does not operate when you are in the PA mode. The CB mode is normal operation of the radio. In the GNF mode, you are in CB operation but the Galaxy Noise Filter is engaged. This is a special noise filter that de-emphasizes audio high frequency response in...

  • Page 6: Rear Panel

    order to increase the signal-to-noise ratio of weak signals. While you will notice a dramatic reduction in the “rushing” sound when this filter is activated, it does not have much effect on the signal-to-noise ratio of strong signals. It is mostly used for SSB reception. 14.

  • Page 7: Frequency Chart

    Figure 2-2 Rear Panel 1. ANTENNA This jack accepts 50 ohms coaxial cable with a PL- 259 type plug. 2. POWER This connector accepts 13.8V DC power cable with built-in fuse. The power cord provided with the radio has a black and red wire. The black goes to negative and the red goes to positive. 3.
  • Page 8 26.965 27.215 26.975 27.225 26.985 27.255 27.005 27.235 27.015 27.245 27.025 27.265 27.035 27.275 27.055 27.285 27.065 27.295 27.075 27.305 27.085 27.315 27.105 27.325 27.115 27.335 27.125 27.345 27.135 27.355 27.155 27.365 27.165 27.375 27.175 27.385 27.185 27.395 27.205 27.405 2.2 MICROPHONE The receiver and transmitter are controlled by the push-to-talk switch on the microphone.

  • Page 9: Microphone

    microphone two inches from the mouth and speak clearly in a normal voice. The radio comes complete with low impedance (500 ohm) dynamic microphone. For installation instructions of the microphone, see section “ALTERNATE MICROPHONES AND INSTALLATION”. 2.3 OPERATION 2.3.1 PROCEDURE TO RECEIVE 1.
  • Page 10 Audio Lead Transmit Control Receive Control Figure 2-3 Your Transceiver Microphone Schematic If the microphone to be used is provided with pre-cut leads, they must be revised as follows : (i) Cut leads so that they extend 7/16” beyond the plastic insulating jacket of the microphone cable. (ii) All leads should be cut to the same length.
  • Page 11 To wire microphone cable to the plug provided, proceed as follows : (i) Remove the retaining screw. (ii) Unscrew the housing from the pin receptacle body. (iii) Loosen the two cable clamp retainer screws. (iv) Feed the microphone cable through the housing, knurled ring and washer as shown Figure 2-4. (v) The wires must now be soldered to the pins as indicated in the above wiring tables.

  • Page 12: Circuit Description

    DESCRIPTION DX 959 3.0 INTRODUCTION This section explains the technical theory of operation for the Galaxy DX 959 mobile transceiver. 3.1 PLL CIRCUIT The Phase Lock Loop (PLL) circuit is responsible for developing the receiver’s first local oscillator signal and the transmitter’s exciter signal. The PLL circuit consists primarily of IC2, IC3, Q25, Q27, Q28 and Q61.
  • Page 13 DX 959 BLOCK DIAGRAM - 12 -...
  • Page 14 DX 959 CIRCUIT DIAGRAM - 13 -...

  • Page 15: Alignment

    CHAPTER 4 DX 959 ALIGNMENT 4.0 REQUIRED TEST EQUIPMENT DC Power Supply (13.8VDC, 10A) Frequency Counter (100 MHz) RF Wattmeter (25~60 MHz, 25W) RF Signal Generator (100 MHz) Multimeter Automatic Distortion Meter Automatic Modulation Meter Oscilloscope (50 MHz) Audio Signal Generator Sinad Meter 4.1 ALIGNMENT PROCEDURES...

  • Page 16: Transmitter Alignment

    4.1.2 TRANSMITTER ALIGNMENT ITEM U.U.T. SETTING ADJUST MEASUREMENT POINT BIAS Current Set radio to CH 19 USB TX mode. MOD off. VR12 50 mA Connect current meter to TP7 (+) and TP9 (-) VR10 100 mA Connect current meter to TP7 (+) and TP8 (-) SSB TX Power Set radio to CH 19, USB TX mode.

  • Page 17: Receiver Alignment

    4.1.3 RECEIVER ALIGNMENT ITEM U.U.T. SETTING ADJUST MEASUREMENT POINT AM Sensitivity Set radio to CH 19 AM RX MODE. L2, L3, L5, Audio output > 2V Clarifier setting in 12 o’clock. L6, L7, L8, S/N 10 dB RF Gain fully clockwise, SQ fully counter L9, L10 clockwise.
  • Page 18 Figure 4-1 Transmitter test setup Figure 4-2 Receiver test setup - 17 -...

  • Page 19: Chapter 5

    Figure 4-3 Main PCB Adjustment Location CHAPTER 5 - 18 -...

  • Page 20: Maintenance

    DX 959 MAINTENANCE 5.0 PRECAUTIONS The inherent quality of the solid-state components used in this transceiver will provide many years of continuous use. Taking the following precautions will prevent damage to the transceiver. (i) Never key the transmitter unless an antenna or suitable dummy load is connected to the antenna receptacle.

  • Page 21: Pcb Layout & Part List

    DX 959 PARTS LIST 6.0 GENERAL Information on most electrical and mechanical parts is included in the parts list. The reference designators are in alphanumeric order. PART LIST : DX 959 VR P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT095950Z VR P.C.B.
  • Page 22 PART LIST : DX 959 ANT P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT360042Z ANT P.C.B. RCY010004Z 0 ohm 0.1W RCY014714Z 470 ohm 0.1W R3,R4 RCY011014Z 100 ohm 0.1W RCY013314Z 330 ohm 0.1W R5,R11 RCY011024Z 1K ohm 0.1W RCY012224Z 2.2K ohm 0.1W...
  • Page 23 - 22 -...
  • Page 24 PART LIST : DX 959 ROTARY SW P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT099N20Z ROTARY SW P.C.B. J4,J5 EX07N48223 PCB C/S 2P EX07N48209 PCB C/S 10P J1,J2 EX07N48928 PCB C/S 12P EX07N48222 PCB C/S 5P S201 EWRT32000S ROTARY SW...
  • Page 25 PART LIST : DX 959 MIC P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT690050Z MIC P.C.B. C501,C502,C503,C504 CC0501027L 0.001µF 50V C505,C506 CC0501037L 0.01µF 50V Q501 TDTA0124ES T/R DTA124ES L501 ECCHK16001 CHOKE COIL 5.6µH L502 ECBAD18526 BEAD COIL MIC PCB...
  • Page 26 PART LIST : DX 959 METER P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT055V51Z METER P.C.B. RCP166824Z 6.8K ohm 1/4W RCP163934Z 39K ohm 1/4W RCU143904Z 39 ohm 1/4W R12,C3 RCU141024Z 1K ohm 1/4W RCU144724Z 4.7K ohm 1/4W RCU141034Z 10K ohm 1/4W RCM144724B 4.7K ohm 1/4W...
  • Page 27 PART LIST : DX 959 BAND P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT095940Z BAND P.C.B. VOL/SQ RV50303522 VR 50KB/50KA W/SW RF GAIN RV10203528 VR 1KB DIM ON/OFF RV50203542 5KB/PUSH SW MIC/R.B ON RV10203541 1KA/PUSH SW RF POWER RV50203525...
  • Page 28 PART LIST : DX 959 DISPLAY P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT073N30Z DISPLAY P.C.B. DISPLAY P.C.B. EX03N40483 LED DISPLAY R325,R327 RCY011024Z 1K ohm 0.1W EX01Y40116 LED LAMP EX01Y40117 LED LAMP EX01Y40114 LED LAMP LED1,LED2,LED3, EX03N40485 LED DISPLAY...
  • Page 29 PART LIST : DX 959 MODE P.C.B ITEM REFERENCE RANGER PART DESCRIPTION NUMBER NUMBER EPT095930Z MODE P.C.B. SWR,OFF,PA,USB, EWSL31027K SLIDE SW REMARK: SOLDER SIDE (WHITE) - 28 -...
  • Page 30 DX 959 MAIN PCB. REMARK: SOLDER SIDE (WHITE) PART LIST DX 959 MAIN PCB - 29 -...
  • Page 31 CC0500501L 5PF 50WV C1,49,108,147 CC0501004L 10PF 50WV REFERENCE RANGER DESCRIPTION CC0501804L 18PF 50WV NUMBER PART NO. CC0502704L 27PF 50WV EPT069610Z MAIN P.C.B C287 CC0503304L 33PF 50WV TP7,8,9 EPT120060Z P.C.B DC B+ CC0508204L 82PF 50WV RCP160004Z 0 Ω 1/16W C4,70 CC0501015L 100PF 50WV R246 RCP161004Z...
  • Page 32 C156,238,293,107 CE0161077Z 100UF 16WV VR1,2,6,17 RE10300031 10K VM6CK PV C152,179 CE0163377Z 330UF 16WV VR9,15 RE10400043 100K VM6CK CE0104777Z 470UF 10WV C243,248 CE0251087Z 1000UF 25WV VR3,4 RE50400087 500K OHM CEM254767Z 47UF 25WV VR10 RE10100074 100 OHM EFCFW455HT CERAMIC RCS0870028 RESISTOR FILTER ARRAY EFCFE107MX CERAMIC...
  • Page 33 J20-METER EX07N48997 WIRE CONN/H J4(METER)-J16(40Z) EX07N48901 WIRE CONN/H J1(METER)-J4(40Z) EX07N49002 WIRE CONN/H J11-J8(20Z)-12(40Z)- EX07N49029 WIRE CONN/H EX07N49024 WIRE CONN/H EX07N49073 WIRE CONN/H EX07N49023 WIRE CONN/H J3(METER)-J9(20Z) EX07N49005 WIRE CONN/H LAMP-J1(20Z) EX07N48233 WIRE CONN/H R233-J1(50Z) EX07N48896 WIRE CONN/H ENTA07222A TA7222AP T2SB00754Y 2SB754Y T2SC02166C 2SC2133C...

  • Page 34: Updates And Corrections

    - 33 -...
  • Page 35 AT0959040A...

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