Elecraft KRX3 User Manual

Page 2

Contents

See Appendix A to install or change crystal filters in a previously assembled KRX3

Introduction ............................................................................................................................................... 3

Customer Service and Support ............................................................................................................................ 4

Technical Assistance ....................................................................................................................................... 4

Repair / Alignment Service ............................................................................................................................. 4

Preventing Electrostatic Discharge Damage ............................................................................................ 5

How ESD Damage Occurs .................................................................................................................................. 5

Preventing ESD Damage ..................................................................................................................................... 5

Preparing for Installation .......................................................................................................................... 6

Tools and Supplies Required ............................................................................................................................... 6

Parts Included ...................................................................................................................................................... 7

Circuit Boards and Enclosure .......................................................................................................................... 7

KRX3 Hardware Bag E850334 ....................................................................................................................... 8

E850344 TMP-BNC Cable Bag ...................................................................................................................... 9

E850249 I.F. Crystal Filter Bag (or Box) ...................................................................................................... 10

Installation Procedure ............................................................................................................................. 11

Installing the Auxiliary DSP Board .................................................................................................................. 12

Checking and Modifying Resistor R91 and DAC Input Circuits ...................................................................... 21

Installing the KRX3 Module Supports .............................................................................................................. 22

Installing the Auxiliary KSYN3 Synthesizer .................................................................................................... 23

Auxiliary KRX3 Antenna Input (Optional) ....................................................................................................... 26

Installing the Auxiliary KRX3 Antenna Input via the KAT3 ....................................................................... 26

Installing the Auxiliary KRX3 Antenna Input Via the Rear Panel BNC Connector .................................... 27

Assembling the KRX3 Subreceiver Module ..................................................................................................... 31

Installing the KRX3 Subreceiver Module ......................................................................................................... 36

Final Assembly .................................................................................................................................................. 43

Removing the KRX3 Module ................................................................................................................. 44

Operation ................................................................................................................................................ 45

Preparing for Operation ..................................................................................................................................... 45

Using the Sub Receiver ..................................................................................................................................... 46

Dedicated Sub Receiver Controls ................................................................................................................. 46

BSET: Additional Sub Receiver Controls ..................................................................................................... 46

Sub Receiver Antenna Selection ................................................................................................................... 46

Sub Receiver Band Independence ................................................................................................................. 46

Diversity Receive .......................................................................................................................................... 47

Sub Receiver Crystal Filter Considerations .................................................................................................. 47

SPLIT Mode with the Sub Receiver ............................................................................................................. 47

Appendix A: Installing Crystal Filters in the KRX3 Subreceiver………..……………………………A1

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