[Elecraft] K2 frequencyh stability

[VR2BrettGraham]

KI6WX added:

>I believe the N1KO data was that he observed a drift of 80 Hz, not 
>800 Hz. A drift that large would indicate something seriously wrong 
>in one of the oscillators.  The current K2 design is not as good as 
>a TCXO, but it is a lot better than an unstabilized crystal 
>oscillator.  It should be possible to reduce the drift to 
>significantly less than 100 Hz over a temperature range of 10-50C 
>with adjustment of resistor RA in the temperature compensation circuit.

No, N1KO's post clearly said 800 cycles.

Some hours later that was then revised to 80.

By then I was out backpacking, I think.  Since
then, I see that we have been told that another
manufacturer could not have sold a product to
amateurs in the quantity they appear to have with
both frequency accuracy & stability of less than +/-
0.5 ppm (-10 to 50C) due to use of single reference
for everything inside.

I also could not be using another product this very
moment that uses only crystals & is spec'd for
stability of +/- 5 ppm (-10 to 50C).

 From cold, 20C ambient, 45 minute drift of ~12
cycles - though could very well be the beacon it
was tuned to drifts & my computer probably is not
really a good frequency counter to begin with.

Invalid points of reference, apparently (pun not
intended ;^).

Usual disclaimer - one's operations may or may
not suffer from some number of dozens of cycles
of drift due to temperature, likewise LSD (or
next-to-LSD) uncertainty may not be a problem if
you do not need to be absolutely certain you are
inside the band.

Now time for another hike.

73, VR2BrettGraham