I just spoke to a friend who has K3 vintage #1021 which he received mid june.
He's having severe receive audio distortion when activating the auto notch.
This will happen on signals S9 and stronger. He thinks that the radio has
firmware 1.73 but couldn't figure out to bring it up. How does one
Fern,
General instructions to upgrade the firmware are in the manual on page 42.
The procedure is to connect the K3 to a computer serial port;
Download the K3 Utility application from the Elecraft website;
Tell K3 Utility which folder on the local computer should be used for
the download
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