[Elecraft] Re: K3: ADC Ref calibration

[chen dave]

My DMM say only 4.93v on pin 2 of the ACC connector. After calibration,
supply voltage measure show me 13.7V, actually it should be 13.85v(test on
K3 PS connector).
During the 100w key down test, K3 shows 13.1~13.2v, but actually it should
be 13.81V.
<I use DAIWA 32A PS>

So, I think 5V "standard" is not so stable. Maybe it is not so important to
power supply
voltage test. but I think it is very important to TCXO module. According to
my test, TCXO is
much sensitive to power supply voltage change (than temperature change).

Any comments?

73 de BA4RF David

On Tue, Dec 16, 2008 at 1:06 AM, wayne burdick <n6kr at elecraft.com> wrote:

> Tom Whiteside (N5TW) wrote:
>
>  I'm wondering if this new ADC reference calibration affects any other
>> calibration settings. Are there other parts of the calibration procedure we
>> should repeat after changing this setting from the default?
>>
>
> Hi Tom,
>
> At present only the PLL voltage and supply voltage measurements are
> affected by the ADC REF calibration. You shouldn't have to re-do any other
> calibration steps.
>
> 73,
> Wayne
> N6KR
>
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