[Elecraft] [K3] K3EXREF K144REFLK and K144XV

[Wayne Burdick]

There is no need to do any type of temperature correction if you're  
using the K3EXREF. This option uses an external reference to send  
corrections to the K3's MCU automatically so that it always knows the  
actual frequency of the 49-MHz oscillator.

What some are asking for is that the K144XV's PLL module also receive  
the benefit of this correction when the K3EXREF is installed. That's a  
small matter of programming on my part.

73,
Wayne
N6KR

On Jun 9, 2011, at 1:23 PM, Bruce Beford wrote:

> Couldn't this be automated for those with the K3EXREF?
>
> Since the K3EXREF is applying a "fudge factor" (technical term)  
> based on the
> instantaneous error of the 49 MHz TXCO, one could "simply" read the
> correction and the front panel temp over a thermal "run". The data  
> could
> then be massaged (another techinal term) internally, to come up with  
> the
> tabular data needed. Yes?
>
> Bruce, N1RX
>
>
>
>
>
> Wayne, N6KR wrote:
>
>> What we could do in a future release is provide a way for customers  
>> to
>> manually generate and use 1-degree data. Call it "Method 4." It seems
>> a bit onerous, but here's the idea: First, you'd put your K3 in the
>> refrigerator long enough to get to 0C, or the desired low operating
>> temp. Next, set the rig up with an accurate frequency counter
>> connected to the output of the oscillator, and put the cover back on,
>> or at least part of the way on (the freq counter cable has to come  
>> out
>> at the back or side). Then, as the radio heats up, write down the
>> oscillator frequencies for each 1-degree point. <snip>
>
>
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