2
Contents
See Appendix A to install or change crystal filters in a previously assembled KRX3A
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
KRX3A Hardware Bag E850334 .................................................................................................................... 8
E850344 TMP-BNC Cable Bag ...................................................................................................................... 9
E850249 I.F. Crystal Filter Bag (or Box) ...................................................................................................... 10
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 KRX3A Module Supports ........................................................................................................... 22
Installing the Auxiliary KSYN3A Synthesizer ................................................................................................. 23
Auxiliary KRX3A Antenna Input (Optional) .................................................................................................... 26
Installing the Auxiliary KRX3A Antenna Input via the KAT3 .................................................................... 26
Installing the Auxiliary KRX3A Antenna Input Via the Rear Panel BNC Connector .................................. 27
Assembling the KRX3A Sub receiver Module ................................................................................................. 31
Installing the KRX3A Sub Receiver Module .................................................................................................... 36
Final Assembly .................................................................................................................................................. 43
Removing the KRX3A Module .............................................................................................................. 45
Operation ................................................................................................................................................ 46
Preparing for Operation ..................................................................................................................................... 46
Using the Sub Receiver ..................................................................................................................................... 47
Dedicated Sub Receiver Controls ................................................................................................................. 47
BSET: Additional Sub Receiver Controls ..................................................................................................... 47
Sub Receiver Antenna Selection ................................................................................................................... 47
Sub Receiver Band Independence ................................................................................................................. 47
Diversity Receive .......................................................................................................................................... 48
Sub Receiver Crystal Filter Considerations .................................................................................................. 48
SPLIT Mode with the Sub Receiver ............................................................................................................. 48
Appendix A: Installing Crystal Filters in the KRX3A Sub Receiver……..………..…………………A1
Elecraft manuals with color images may be downloaded from
www.elecraft.com
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