http://elecraft.85.s1.nabble.com/k2-freq-readout-calibration-tp394462p394466.html
Thanks for the detailed information.). Verified setting of C22 with both
TP2 with a 10MHz signal). Did the CAL PLL and CAL FIL routines, But...no
good..still unable to calibrate correctly (still 1-2 KHz off). As mentioned
So I bit the bullet and performed a "hardware reset"' (456+power Up). Set
all settings (FIL etc) again --> tried to calibrate: same result: not good.
1. First, when tuning across a carrier signal I noticed very strong clicks
when tuning away from the carrier, just every 5 KHz or so.
2. During fiddling around in the menu's (resetting my transverter option),
> -----Original Message-----
> From: Don Wilhelm [mailto:
[hidden email]]
> Sent: Wednesday, October 11, 2006 10:14 PM
> To:
[hidden email];
[hidden email]
> Subject: RE: [Elecraft] k2, freq readout calibration
>
> Carel,
>
> The K2 does not use the 4 MHz oscillator in real time for frequency
> determination, most of the time it only serves as the oscillator for the
> microprocessor, so its frequency is not critical. That is why nothing
> obvious happens when you change C22.
>
> The 4 MHz Reference osc is used for frequency determination during CAL
> FCTR,
> CAL PLL and CAL FIL. Before expecting accuracy with any of these menu
> procedures, you must accurately set the 4 MHz oscillator beforehand.
>
> If you did not accurately set the 4 MHz oscillator first, that alone may
> explain your dial calibration error. Let the K2 warm up for about 1/2
> hour
> before starting the calibration cycle.
>
> If you have an accurate frequency counter (known accurate to 1 Hertz or
> better at about 12 MHz), then you can use the counter to set the 4 MHz
> reference oscillator. Set the K2 to the 7 MHz or the 10 MHz band and
> connect both the internal counter probe and the external counter to test
> point TP1. Enter the menu for CAL FCTR and then adjust C22 until the
> frequency displayed on the K2 matches the frequency shown on the external
> counter. This method is outlined in the K2 manual.
>
> If you do not have an accurate frequency counter, you can still set C22
> with
> accuracy as long as you can receive a station of known frequency. A
> standard station like WWV is ideal, but other broadcast stations will
> suffice if their operating frequency is known (an AM station is best).
> Tune
> the station accurately in LSB or USB mode, then set the K2 menu to CAL
> FCTR.
> Read the frequency at TP1, then read the frequency at TP2 and subtract the
> two. Adjust C22 until the result of the subtraction is equal to the
> transmitting frequency of the station you used as your 'standard'. This
> procedure is the one available on the Elecraft website for download (it is
> not in the K2 manual). The resulting accuracy does depend on your ability
> to accurately tune the station (be certain to use LSB or USB, not CW
> because
> of the CW offset). I like to use WWV because I can use Spectrogram to
> display the 500 or 600 Hz tones and know that I have it tuned accurately -
> other standard stations have their own transmitting format, check the one
> that you can receive.
>
> After accurately setting the 4 MHz oscillator (and before it drifts
> significantly), run CAL PLL and then enter CAL FIL - tap BAND- and cycle
> through each of the BFO settings, change each one (and then change it back
> to the original setting if it was previously correct) to force the K2 to
> write new values into EEPROM based on the new setting of C22. You must do
> this for each and every BFO - 8 for SSB, 8 for CW and if you have the RTTY
> filters set, yet another 8 BFOs must be set.
>
> When you hgave finished all that, retune the station you originally used
> for
> a standard, and you should find it now tunes within 20 Hz of the correct
> frequency. If not, you did something wrong (or out of sequence) along the
> way - the sequence is important, set C22 first, then CAL PLL and then CAL
> FIL.
>
> 73,
> Don W3FPR
>
>
> > -----Original Message-----
> >
> > I have for some time (1 year) a well functioning k2. Never
> > bothered to do a
> > proper frequency.calibration because I used the k2 as IF for VHF.
> > Recently I
> > tried to do so (according to the w3fpr method), but no luck. I
> > can't get the
> > dial correct and have a quite big error (2 KHz or so). It seems that
> there
> > is no change at all when performing the calibration (yes I do PLL CAL
> and
> > XFIL CAL.).
> >
> > I do have one question to start with:
> >
> > If you tune to a carrier (CW) signal and adjust C22 (on the control
> board,
> > to adjust the 4MHz xtal osc) what should happen ? Should the pitch of
> the
> > carrier change ? should the frequency readout change ? (With my
> > K2 "nothing"
> > happens, no change in pitch, no change in readout, is this normal ?.).
> >
> >
>
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