Hi Wes,

Yes that is what the K3 does with the external ref using it to measure the internal ref freq and use a software loop to steer.

I saw this adjusting one a previous practice for the FMT and asked Elecraft.

73, tom w7sua

On 4/1/2022 4:37 PM, Wes wrote:
Furthermore, even with the ext ref option my understanding is that it doesn't actually tune the internal ref, it just measures it and tweaks the ref cal every four seconds.

Wes  N7WS
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