Galaxy DX 2547, User Manual

Page 1: ...ternate Microphones and Installation 10 CHAPTER 3 CIRCUIT DESCRIPTION 3 0 Introduction 11 3 1 PLL Circuit 11 3 2 Receiver Circuit 11 3 3 Transmitter Modulation Circuit 11 3 4 Transmitter Amplifier Cir...

Page 2: ...er Suppression 60dB Audio Frequency Response 300 to 2500 Hz Antenna Impedance 50 Ohms Output Indicators Meter shows relative signal strength RF output power SWR and AM Modulation level Transmit LED gl...

Page 3: ...e supplied with your radio 3 RF POWER CONTROL This control allows the user to adjust RF power output 4 RF GAIN CONTROL This control is used to reduce the gain of the RF amplifier under strong signal c...

Page 4: ...essed in your voice will be heard only if an external speaker has been plugged into the PA jack on the back of the radio The radio does not operate when you are in the PA mode 10 ROGER BEEP SWITCH Whe...

Page 5: ...clockwise rotation will increase the threshold level so that only strong signals will be heard 21 TALKBACK CONTROL Adjust this knob for desired volume of Talkback This is used to monitor your own voic...

Page 6: ...ed when the NB is on 35 LSB LED This LED lights red when the radio is in the LSB mode 36 CH9 NORMAL CH19 SWITCH This control allows you to select channel 9 or channel 19 instantly When the switch is p...

Page 7: ...black goes to negative and the red goes to positive 4 AC DC POWER SELECTOR This control is used to select a desired power supply of AC power or DC power 5 ANTENNA This jack accepts 50 ohms coaxial cab...

Page 8: ...5 10 27 075 30 27 305 11 27 085 31 27 315 12 27 105 32 27 325 13 27 115 33 27 335 14 27 125 34 27 345 15 27 135 35 27 355 16 27 155 36 27 365 17 27 165 37 27 375 18 27 175 38 27 385 19 27 185 39 27 39...

Page 9: ...ignal is actually received Do not advance the control too far or some of weaker signals will not be heard 6 Set the CHANNEL selector switch to the desired channel 7 Set the RF GAIN control fully clock...

Page 10: ...rovide the functions shown in the schematic below Figure 2 3 4 WIRE MIC CABLE Pin Number Mic Cable Lead 1 Audio Shield 2 Audio Lead 3 Transmit Control 4 Receive Control Figure 2 3 Your Transceiver Mic...

Page 11: ...is fed into the dual mosfet mixer circuit of Q18 Q19 and then into the AM SSB IF section of the receiver depending on the mode of operation The signal is then detected by either the AM detector or pr...

Page 12: ...12...

Page 13: ...13...

Page 14: ...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 CLA...

Page 15: ...one VR13 11 5 W SSB Carrier Balance Set radio to CH 19 USB TX mode Set MIC GAIN Fully Counter Clockwise Connect Oscilloscope to antenna connector VR6 Spurious Emission to Minimum AM TX High Power Set...

Page 16: ...dB LSB Sensitivity Set radio to CH19 LSB RX mode Set VOL Control Fully Clockwise RF SG setting 27 184 MHz 0 5uV Mod off L11 L12 Audio Output 2V S N 10dB NB Adjust Set radio to CH 18 AM RX mode RF SG s...

Page 17: ...17 Figure 4 1 Transmitter test setup Figure 4 2 Receiver test setup...

Page 18: ...t be expected without periodic inspection and maintenance Important points to be checked regularly are as follows Check Item Action Whip antenna option If cracked or broken replace it Coaxial cable If...

Page 19: ...19 DX 2547 DIAGRAMS 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...

Page 20: ...20...

Page 21: ...Y011034Z C F R 10K 0 1W 6 D306 D307 D308 D309 D310 D311 D312 D313 D321 EDSS00181Y DIODE 1SS181 TE85L 7 D314 D315 D316 D320 EDSS00184Y DIODE 1SS484 TE85L 8 D301 D302 D303 D304 D305 D317 D318 D319 D322...

Page 22: ...2224Z 2 2K OHM 0 1W 8 R12 RCY014724Z 4 7K OHM 0 1W 9 R7 RCY011034Z 10K OHM 0 1W 10 C5 RCY012234Z 22K OHM 0 1W 11 C7 CK1059AB1A 0 5PF 50WV 12 C6 CK1030AB1A 3PF 50WV 13 C3 C4 CK2104AB7R 0 1uF 25WV 14 C1...

Page 23: ...23 PART LIST...

Page 24: ...RCY011044Z C F R 100K 0 1W 12 C302 CK1101AB5L CHIP C 100PF 50WV 13 C301 C307 CK1561AB5L CHIP C 560PF 50WV 14 C304 C316 C319 C320 CK2104AB7R CHIP C 0 1uF 25WV 15 C303 CK1223AB7R CHIP C 0 022uF 50WV 16...

Page 25: ...547 PUSH SW P C B ITEM REFERENCE NUMBER RANGER PART NUMBER DESCRIPTION 1 EPT254720Z PUSH SW PCB 2 PA RB EWPS33033X PUSH SW 3 J201 EX07N49140 PCB CONN S 2PIN 4 CB G PA EX07N49144 PCB CONN S 3PIN REMARK...

Page 26: ...SH SW PCB 2 J501 EX07N48234 PCB CONN S 2PIN 3 J503 EX07N48761 PCB CONN S 4PIN 4 J502 EX07N48667 PCB CONN S 5PIN 5 9 NOL 19 EWRT32087S ROTARY SW 6 SQUELCH RV50303532 VR 50KB 7 VOLUME RV50303547 V R 50K...

Page 27: ...27...

Page 28: ...K 1 16W 10 R411 R412 R413 R415 R416 RCP164734Z C F R 47K 1 16W 11 D410 EX01Y40114 LED LAMPS 12 D409 D411 EX01Y40116 LED LAMPS 13 D401 D408 EX01N40090 LED 14 1 2 3 4 5 6 EX03N40476 LED DISPLAY 15 DISPL...

Page 29: ...T LIST DX 2547 TALKBACK P C B ITEM REFERENCE NUMBER RANGER PART NUMBER DESCRIPTION 1 EPT254760Z TALKBACK PCB 2 TALKBACK PCB EX07N48667 PCB CONN S 5PIN 3 TALKBACK RV20303558 VR 20 LA REMARK COPPER SIDE...

Page 30: ...4 C505 C506 CC0501027L C C 0 001uF 50WV 3 C501 C502 CC0501037L C C 0 01uF 50WV 4 Q501 TDTA0124ES TR DTA124ES 5 L501 ECCHK16001 CHOKE COIL 6 L502 ECBAD18506 BEAD COIL 7 1 4 EX06N41101 MIC JACK 8 J502 E...

Page 31: ...31...

Page 32: ...31 C32 C33 C35 C36 C28 CK2104AB7R 0 1uF 25WV 15 C5 7 16 20 22 25 38 40 CK1103AB6U 0 01uF 50WV 16 C13 CK1102AB7L 0 001uF 50WV 17 C9 C18 C27 C30 C34 CK5105AA7R 1uF 16WV 18 U3 YNRG0GX3SP IC LC7232N 18PIN...

Page 33: ...R RANGER PART NUMBER DESCRIPTION 1 EPT254770Z DIM RF MIC GAIN PCB 2 J601 EX07N49095 PCB CONN S 6PIN 3 J603 EX07N48947 PCB CONN S 3PIN 4 J602 EX07N48234 PCB CONN S 2PIN 5 RF MIC GAIN RV10203524 VR 1KB...

Page 34: ...ITEM REFERENCE NUMBER RANGER PART NUMBER DESCRIPTION 1 EPT254780Z RF MOD P C B 2 J801 EX07N48234 PCB CONN S 2PIN 3 J802 EX07N48620 PCB CONN S 7PIN 4 SWR MOD PWR EWRT32087S ROTARY SW 5 RF POWER RV50203...

Page 35: ...EM REFERENCE NUMBER RANGER PART NUMBER DESCRIPTION 1 EPT254790Z MODE FINE PCB 2 J903 EX07NM48947 PCB CONN S 3PIN 3 J901 J902 EX07N48761 PCB CONN S 4PIN 4 USB AM LSB EWRT32087S ROTARY SW 5 CLARIFIER RV...

Page 36: ...MBER RANGER PART NUMBER DESCRIPTION 1 EPT253790Z EAR PCB 2 PA EXT SP EX06N41034 EAR JACK 3 J2 J3 EX07N48223 PCB CONN S 2PIN 4 J1 EX07N48350 PCB CONN S 3PIN 5 JP1 WX01070710 JUMPER WIRE 6 C902 C901 CC0...

Page 37: ...CP102214Z C F R 220 1W 6 R702 R703 RCP108214Z C F R 1W 7 R701 RCP101224Z C F R 1 2K 1W 8 C701 CC0501037L C C 0 01uF 50WV 9 C703 CC0504737L C C 047uF 50WV 10 C702 C708 CC1002237L C C 022uF 100WV 11 C70...

Page 38: ...38 PART LIST DX 2547 DC P C B ITEM REFERENCE NUMBER RANGER PART NUMBER DESCRIPTION 1 EPT253780Z DC PCB 2 DC PCB TZ2N05301Z TR 2N5301 REMARK COPPER SIDE WHITE...

Page 39: ...39 DX 2547 MAIN PCB...

Page 40: ...107 RCP166834Z 68K 1 16W R45 RCP168234Z 82K 1 16W R12 42 43 44 51 53 104 108 112 182 184 221 225 278 RCP161044Z 100K 1 16W R47 117 135 139 194 RCP162244Z 220K 1 16W R49 55 170 172 176 RCP162744Z 270K...

Page 41: ...D109 ED1N04007Z DIODE 1N4007 D16 17 EDSS00053Z DIODE 1SS53 D59 72 EDMA00027W DIODE MA27W A D71 103 145 156 EDMA00027T DIODE MA27T A D73 EDZD05759Z ZENER DIODE D70 EDZD05519Z ZENER DIODE D49 EDSV00251Z...

Page 42: ...KNOB PT2537040A VR KNOB PT2537050A INNER KNOB PT2537060A OUTER KNOB POWER PT2537070A PUSH BUTTON ANL PT2537080D PUSH BUTTON 4 NB PT2537080E PUSH BUTTON 4 GNF PT2537080F PUSH BUTTON 4 CLARIFIER PT2537...

Page 43: ...43 Main PCB Adjustment Location...

Page 44: ...44 Any updates or corrections to this Service Manual will be included in the Tech Support section of our website at www GalaxyRadios com UPDATES CORRECTIONS...