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SPECIFICATIONS
     Owner's Manual

RADIO MODIFICATIONS
      Frequency Conversion For (EPT004410Z Band PCB)
      Frequency Conversion For (EPT004410A "SMT" Band PCB)
      Channel Chart (After Modification)
      10 meter FM Mod (28.000 - 29.655MHz)
      Clarifier Mod
      Disabling Talkback
      Roger Beep Tone Mod

ALIGNMENT PROCEDURES
     PLL Alignment
     Receiver Alignment
     Transmitter Alignment
     Alignment Locations
     VCO Frequency Generation Chart Bands Bands A-D and Bands E-H

SEMICONDUCTOR INFORMATION
     Transistor Voltage Chart
     Integrated Circuits Voltage Chart
     Active Device Function Location Layout (Main Board)
     Semiconductor Datasheets

DIAGRAMS
    DX88HL Block Diagram
    DX88HL Inter-connection Diagram (Echo EPTOSSB50B Based Radio)
    DX88HL Inter-connection Diagram (Echo EPTOSSB50B Based Radio)
    DX88HL Schematic Diagram (Mar. 17, 2004)
    Band Board Schematic Diagram (EPT004410Z)
    Frequency Counter PCB Schematic Diagram (EPT210010A / 11A)
    Frequency Counter PCB Schematic Diagram (EPT210014C)
    Frequency Counter PCB Schematic Diagram (EPT210014D)
    Echo PCB Schematic Diagram (EPT0SSB50B) (Early Version)
    Echo PCB Schematic Diagram (EPT0SSB50F)

PCB Layouts and Parts
    Main PCB (EPT360014B)
    Mic Jack PCB (EPT360050Z)
    Frequency Display and Pushbutton Switch PCB (EPT210021A)Very Early
    Production
    Frequency Display and Pushbutton Switch PCB (EPT210021C)
    Channel Display PCB (EPT210040Z) Very Early Production
    Channel Selector Switch PCB (EPT210030Z) Very Early Production
    Channel Display PCB (EPT210041Z) Current Production
    Channel Selector Switch PCB (EPT210032Z) Current Production
    Band Board Layout (EPT004410Z)
    Band Board Layout SMT (EPT004410A) Current Production
    Frequency Counter PCB (EPT210010A) Very Early Production
    Frequency Counter PCB (EPT210011A) Early Production
    Frequency Counter PCB (EPT210014C) Current Production
    Frequency Counter PCB (EPT210014D) (Started with later 2005 Production)
    Echo PCB (EPT0SSB50B) (Early Version)
    Echo PCB (EPT0SSB50F) (Used to the end of 2002)
    Echo PCB (EPT0SSB51J) Current Production

Chassis, Miscellaneous & Mechanical Parts
    Front View Chassis Parts
    Front View Chassis Parts
    Rear View Chassis Parts
    Rear View Chassis Parts
    Miscellaneous & Mechanical Parts

Mic Wiring Diagram

Stock
1- Shield  (Ground)
2- Yellow  (Audio)
3- Red      (Transmit)
4- White   (Receive)

Astatic (4 wire)
1- Shield
2- White
3- Red
4- Black

Astatic (6 wire)
1- Shield & Blue
2- White
3- Red
4- Black
Yellow NC

Daiwa EM-500
Cobra CA Series
1- Shield & Black
2- Red
3- White
4- Blue

Galaxy DC-521S (4 wire)
1- Shield
2- Yellow
3- Red
4- Black

Galaxy CB-660EI
1- Shield & Black
2- White
3- Red
4- Blue

Sadelta
1- Shield
2- White
3- Brown
4- Green

Turner
1- Shield & Red
2- White
3- Blue
4- Black
Yellow NC