[Elecraft] K2 frequency adjustment

[Brett gazdzinski]

Don,
thanks for the great idea of using the spectrogram
and WWV.

That's another thing I did not think of.

I heard some great slow CW on both 80 and 40 meters
tonight!


Brett
N2DTS 

> -----Original Message-----
> From: Don Wilhelm [mailto:w3fpr at earthlink.net] 
> Sent: Monday, April 16, 2007 7:49 PM
> To: Brett gazdzinski
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K2 frequency adjustment
> 
> Brett,
> 
> Since you can probably hear 10 MHz WWV at your QTH, why not use that 
> signal in LSB or USB to set C22 very accurately.  The method 
> to do that 
> is on the Elecraft website on the Builder's Resource page.
> 
> I also recommend that one use Spectrogram to tell when WWV is tuned 
> 'just right' - I place markers at 500 and 600 Hz and watch as the 
> transmitted tones line up with the markers.  Once you get it 
> right, you 
> can expect proper dial calibration within 20 Hz typically.  The whole 
> procedure is in the K2 Dial Calibration article on my website 
> http://w3fpr.qrpradio.com
> 
> When you are done, if the K2 tunes in WWV in LSB or USB mode with 
> accuracy, all bands will also be accurate.  Then if you find yourself 
> off frequency, you can blame the other radio.
> 
> 73,
> Don W3FPR
> 
> Brett gazdzinski wrote:
> > Funny, I had today off and decided to do the same thing.
> > I used the 756 pro as a source, did the adjustment, redid
> > all the filter bfo settings, and went from 4000 Hz off to about 500,
> > but I could not tell as I could not zero beat and did not think
> > of changing the filter.
> > 
> > When both the 756 and the K2 are tuned to the same frequency,
> > they hear each other, but at maybe 400 or 500 Hz differences.
> > 
> > Close enough for me anyway...
> > 
> > Last time I did my filters, I paid a lot of attention
> > on getting things to sound the same between filters and
> > CW normal and reversed.
> > Tune a signal in spot on the nose (same as sidetone) and
> > switching between cw normal and reverse does not change the pitch.
> > 
> > That is useful if you have qrm on one side.
> > 
> > Listening on CW or ssb and changing filters does not change the
> > pitch any, which is nice...
> > 
> > The radio really does work well!
> > I enjoy listening to cw (at speeds to fast for me to copy)
> > for hours!  ssb sounds good in the headphones, the little speaker
> > inside the K2 does not really cut it for ssb...
> > 
> > Brett
> > N2DTS
>