[Elecraft] K2 Frequency Calibration

[Don Wilhelm]

Samuel,

I can only add to what Ron has already stated that in addition to setting
the reference oscillator correctly then running CAL PLL, you must also run
CAL FIL to store the proper BFO values in the EEPROM.

Take a look at the K2 Dial Calibration article on my website
http://w3fpr.qrprqdio.com for a complete description of the entire process.
The reading is more complex than actually doing the procedure.

73,
Don W3FPR

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Ron D'Eau Claire
> Sent: Friday, December 16, 2005 6:42 PM
> To: 'Samuel Ramac'; Elecraft at mailman.qth.net
> Subject: RE: [Elecraft] K2 Frequency Calibration
>
>
> No, that's not "normal", Samuel. You can get frequencies within
> 20 or 30 Hz
> on your K2. For example, my K2 indicates 10.000.01 right now for WWV at 10
> MHz. That's an error or 10 Hz.
>
> Two things can cause the error: operating procedure and the calibration of
> the 4MHz master oscillator in the K2.
>
> The K2 calibrates the dial readout using the 4 MHz master
> oscillator on the
> control board as the reference for a built-in frequency counter.
> That's why
> the setup procedure for CAL PLL and CAL FIL requires connecting a probe to
> the PLL oscillator and BFO. The PLL oscillator frequency is measured when
> you run CAL PLL, and the BFO is measured when you do CAL FIL.
>
> There are a number of ways to set the 4 MHz "dead on" without any external
> test equipment. They can be found under the "builders resources"
> section of
> the Elecraft web site (www.elecraft.com). See "Notes on Adjusting
> C22 to put
> the K2 on Frequency" under Construction Notes.
>
> Once you have done that your frequency display should be within
> 20 or 30 Hz
> across all the bands.
>
> It does take proper operating procedure, however. The easiest was
> to be sure
> you have a station properly tuned in is to zero beat the carrier with
> sidetone in CW mode. An alternative, if you can hear subtle changes in
> musical pitch, is to tune in WWV and adjust the tuning for
> minimum change of
> the tone frequency as you switch from USB to LSB.
>
> Both of them should  produce an frequency error of a few tens of Hz, not
> more.
>
>
> Ron AC7AC
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Samuel Ramac
> Sent: Friday, December 16, 2005 2:52 PM
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] K2 Frequency Calibration
>
>
> Can anyone tell me if this is normal?  I tried to calibrate C22
> using W1AW
> and found the following
>
> W1Aw Freq
> 1.8175Mhz    delta = 0.07 Khz
> 3.5815         delta = 0.13 Khz
> 7.0475         delta = 0.30 Khz
> 14.0475       delta = 0.61 Khz
> 18.0975       delta = 0.73 Khz
>
> Is the delta at higher frequency higher normal?
>
> I have a K2 S#: 1866.  with 2.04P firmware..
>
>
> - - - - - - - - - - - - - - - - - - - - - - - -
> Samuel C. Ramac
> samuel_ramac at hotmail.com
>
>