[Elecraft] K2 4 MHz Oscillator Cal

[Don Wilhelm]

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.
>