[Elecraft] Re: BFO Drift (and a solution for it)

[John, KI6WX]

Dave;
The first design of the K2 used a solenoidal inductor, but this was changed
to a toroidal inductor around S/N 1200.  The solenoidal inductor has less
drift than the toroidal inductor, but from what I have seen of Wayne's
stability measurements, the new toroidal inductor should be better than the
previous versions.
-John
 KI6WX


> Wayne:
>   I'm kinda confused.  L33 in my K2 is not a toroid, but a 39uH
solenoidal,
> shielded inductor. I believe there may have been a mod to replace this
with
> a toroid, but I never did.  Does the solenoidal inductor have the same
> problem relative to drift?  Would it be better to switch this out with
your
> modification kit when it becomes available?
>
> thanks,
>
> dave belsley, w1euy