Dave,

Remove the top cover - there should be a sticker either on the bottom of the top cover or on the top of the sub-RX showing the filters installed and the offsets if they are not the 8 pole filters. If the sticker is not present (or is incorrect), then yes, you will have to remove the Sub-RX to see the filters in the main RX and remove the sub-RX cover to see the filters installed.

73,
Don W3FPR

On 10/16/2023 1:55 PM, Dave wrote:
I recently purchased another K3 that I believe was Factory Reset prior to the 
sale. Is there a way to determine which, if any, optional filters are installed 
without opening it up? It has the 2 meter xvtr and 2nd receiver installed and 
I’d prefer not to uninstall things.


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