The KXFL3 is actually 4 different filters that are shared between Phone and CW modes. Containing 2 filters for each mode, the filters switch points are:
This means that you get the value of 4 filters in other radios for less than the price of one in other radios!
A: Yes. As with all Elecraft options, you can install any option at any time
A: No. Elecraft techs will take care of calibrating your KX3 with the KXFL3 installed as it is built for you.
A: There is a calibration procedure you'll be following when you install the KXFL3 but the test signals you'll need to conduct it are available inside the KX3. This means that you'll