Neil,

First, the K3 knob(s) will not fit the shaft of the older encoder on the K2. If the K2 was built quite recently (or has had the encoder changed to the new one), then the K3 knob(s) will fit.

I would suggest the K3 VFO B knob for those newer K2s - the VFO A knob is too large and its diameter interferes with the display plastic. You would have to add substantial thickness to the felt washer to provide a bit of drag on the knob.

Know that the K2 knob is weighted, but its weight is not as heavy as the CNC knobs that have been offered.

My gut feeling is that one reason that those heavy knobs are used is to allow giving the knob a spin to make large QSY excursions. The problem with that is with a free-spinning knob, the knob may move after it is stopped, so the frequency you thought you stopped at will be changed when you lift your fingers from the knob. I have had several K2s sent to me for repair that had no drag on the knob, and part of the reason for sending the K2 for repair was that "the K2 drifts".
There must be some drag on the knob if this "drift" is to be avoided.

Lastly, if you install a heavy knob and then ship your radio for any reason, you should remove the knob to assure that the encoder shaft will not be damaged during shipment.

73,
Don W3FPR

On 1/17/2017 6:11 PM, Niel Skousen wrote:
Has anyone used the K3s knob on a K2 ?

Does it fit, how do you like it ??

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