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Stalker 9 DX, PC-893 PCB and is 80 channel multimode with AM, FM, USB and LSB covers 26.965 to 27.405 and 27.415 to 27.885.

Diagrams
Schematic Diagram (Courtesy of Rick Hankinson Euro Radio Co)

ALIGNMENT PROCEDURES (Courtesy of Rick Jackson)
PLL Alignment
PLL Alignment Locations
Transmitter Alignment
Transmitter Alignment Locations
Receiver Alignment
Receiver Alignment Locations

IRF520 MOSFET Final Mod Sheet (Courtesy of Rick Jackson)

Mic Wiring

Stock
1- Shield
2- Audio
3- Transmit
4- 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