[Elecraft] K2 4 MHz Oscillator Cal

[Mark Yergin]

BNC with mini test clips.  I can switch in 10x (or 1x) on the FC but that
doesn't make any difference.

FC is a BK Precision 1823A.

Mark

On Sun, Apr 21, 2019 at 11:37 AM Don Wilhelm <donwilh at embarqmail.com> wrote:

> Mark,
>
> What kind of probe are you using on your external frequency counter?
> You should be using a 10x probe like you would use on an oscilloscope to
> keep the loading of the circuit by the probe capacity to a minimum.
>
> 73,
> Don W3FPR
>
> On 4/21/2019 11:30 AM, Mark Yergin wrote:
> > I found that when both my external FC probe and the probe provided by the
> > kit were attached to TP3 the K2 frequency reading was lowered
> significantly
> > (~12070 from about 12098) vs when measured separately.  C22 could not
> make
> > a match.  Separately the two measurements were fairly close, and I could
> > use C22 to make them the same using the hold feature on my external FC to
> > capture it's reading, and adjusting C22 to match it on the K2 with only
> the
> > kit probe attached.  Is this OK?  The manual talks about having both
> > connected at the same time, but the interaction of the two was an issue
> for
> > me.
> >
>