Posted by Bill W4ZV on URL: http://elecraft.85.s1.nabble.com/K3-Sub-Receiver-tp3997717p3998894.html
Barry Simpson wrote
Following my earlier post I have now found how to configure the sub receiver
filters in K3 Utility.
For reasons you've discovered, it's a good idea to occasionally SAVE your configuration using the K3 Utility. You can then RESTORE it if necessary, including all filter settings, etc.