Mark,

If the roofing filter was added to your original order, it will be calibrated at the factory (even if it is a kit).

If you add the roofing filter later, you will have to do the calibration for optimum results.

73,
Don W3FPR

On 1/29/2018 5:31 PM, Mark Petiford via Elecraft wrote:
  Re:  "If you do choose the roofing filter, be certain you do the calibration
if it is a kit."


Don,

My kit build KX3 instruction manual says that I don't have to do the 
calibration if I ordered the filters WITH my KX3 kit:

"If you received the optional KXFL3 filter with your kit, you do not need to perform 
theReceiver Sideband alignment procedure referenced in the Owner’s manual and describedin 
detail in the KXFL3 option manual. That procedure was done for you at the factory."

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