[Elecraft] Questions about K3: Reference oscillator calibration

[W5UXH]

I cannot address you by name or call, but greetings none the less (possibly
you are Tom?):

I just uploaded a Youtube demo of the procedure that I use to calibrate the
K3 on WWV at 10 MHz.  In the demo I start off with a nominal 6 Hz error and
show how I make use of the toggle between CW-NORMAL and CW-REVERSE to judge
when I am exactly zero beat.  It is a matter of judging when the tones heard
from the WWV carrier (*not* the modulated tones they have on the carrier)
are equal as I switch between CW-NOR and CW-REV using the MODE-->ALT
function to toggle back and forth.

Since I was 6 Hz high, I turned the REF CAL frequency *down* from 49.379.780
to 49.379.756 (24 Hz) to accomplish the calibration adjustment.  Your exact
frequency will of course not be the same as mine.

I do not know if this will be sufficiently clear in the demo, but I find it
works very well for me.  When I did this 3 months ago, my starting error was
25 Hz high.  Since calibrating it to 0 Hz error at that time,  I have
"drifted" only 6 Hz.  Not bad at all (no high stability option installed
here).  The demo is hopefully found at this link:

http://www.youtube.com/watch?v=_SWRlTUG5RM

73,

Chuck, W5UXH
Las Cruces, NM



tomb18 wrote:
> 
> Hi,
> 
> I just finished my kit and I seem to have some difficulty determining if
> the ref. osc. is calibrated correctly.  I am using an off air signal
> (wwv).  I can hear the monitor tone and then another one that gets lower
> in pitch as I turn vfo a.  But i can never hear a "zero beat".  
> 


--
View this message in context: http://elecraft.365791.n2.nabble.com/Questions-about-K3-Reference-oscillator-calibration-tp6515521p6515973.html
Sent from the Elecraft mailing list archive at Nabble.com.