K2: calibration again?

[Erik Linder]

Hi again,

This is not an question about my rig, it's more like a wondering...

I have made two automatic calibrations on my K2. The first one early in
the building-process and the second was the VCO linerization.

Are these processes "run once" and not possible to run again?
Or is there a way to make a factory reset of all parameters?

I don't know when I want to run them again, but I very much like to know
how things work.

Tnx
SM0RVV ./Erik
K1 #1978
K2 #4904 (soon on air)

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[Don Wilhelm-3]

Eric,

Once the proper values are written into the EEPROM by the CAL PLL and CAL
FIL processes, they should remain stable unless the PLL reference oscillator
frequency changes substantially (similarly the BFO Frequency).

The most important thing to assure accuracy is to carefully set the K2
reference oscillator shortly before doing CAL PLL and CAL FIL.  Once these
proceses run, the reference oscillator can drift all it wants to and will
not affect the K2 calibration (because it is not used in normal operation
for calibration purposes).

If you want to do a really 'super' job of setting the K2 reference
oscillator, take a look at my website http://w3fpr.qrpradio.com or the
mirror at http://home.earthlink.net/~w3fpr or the mirror at
www.qsl.net/w3fpr - the K2 Dial Calibration article should give you several
methods of setting the reference accurately, and step 3 (CAL FIL) provides
good information and links to additional information about setting the
filters.

73,
Don W3FPR

> -----Original Message-----
>
> This is not an question about my rig, it's more like a wondering...
>
> I have made two automatic calibrations on my K2. The first one early in
> the building-process and the second was the VCO linerization.
>
> Are these processes "run once" and not possible to run again?
> Or is there a way to make a factory reset of all parameters?
>
> I don't know when I want to run them again, but I very much like to know
> how things work.
>
> Tnx
> SM0RVV ./Erik
> K1 #1978
> K2 #4904 (soon on air)
>

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[Ron D'Eau Claire-2]

Eric wrote:
I have made two automatic calibrations on my K2. The first one early in
the building-process and the second was the VCO linerization.

Are these processes "run once" and not possible to run again? Or is there a
way to make a factory reset of all parameters?

I don't know when I want to run them again, but I very much like to know
how things work.

--------------------------

You can run them as often as you like. New data is written to memory each
time. Indeed, CAL PLL is required if you want to improve the calibration by
adjusting the 4 MHz clock with C22. If your dial calibration is off a bit,
it's because the internal K2 frequency counter (CAL FCTR mode) was not exact
when you ran CAL PLL. So you adjust C22 according to one of several methods
(some are on the Elecraft web site), then you must re-run CAL PLL to cause
the K2 to record new frequency data in memory.


The same is true with your BFO frequencies and filter bandwidths in CAL FIL
and any other calibration you do using the MENU commands.

Ron AC7AC


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