[Elecraft] K3 - Power cable voltage drop

[Keith Trinity WE6R]

I would leave it at 4.96 as that tells me it was set at some point (from 
5.00 default).
However, if you think the internal metering is wrong, you could double 
check it if you have a calibrated meter.
Valid range of ADC REF setting is 4.75 to 5.25 and I typically see the 
correct value around 4.85 to 5.05.
To experiment, I checked at 5.25 and 4.75
Set at 5.25 the internal volt meter displayed 14.2V.
Set at 4.75 it showed 12.9V
That is a 1.3 volt swing so it is worth setting properly.
Keith WE6R

On 12/26/2019 3:39 PM, Mike Flowers wrote:
> Hi Keith,
>
> Mine reads 4.96, so should it be set to 5.0 or left alone?
>
> Thanks.
>
> - 73 and good DX de Mike, K6MKF, NCDXC Secretary
>
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net>
>> On Behalf Of Keith Trinity WE6R
>> Sent: Thursday, December 26, 2019 15:25
>> To: elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] K3 - Power cable voltage drop
>>
>> Notes for all;
>> Check the K3 config menu item "ADC REF".   If at 5.00 it is probably at
>> default.
>> (if at 4.00 a glitch occurred, probably during FW update, and will FUBAR
> the
>> internal metering. Set to 5.00 or read on).
>> (I check this during checkout, so if it has been in for Service, it should
> be OK).
>> Higher accuracy of the K3 items like the internal Volt-Meter can be had if
> this is
>> set properly.
>> With a known external meter on Pin 2 to ground of the 15 pin ACCY
> connector;
>> Go into config menu ADC REF and set it.
>>
>> Also you can stick your probes into the Anderson connectors at the back of
> the
>> radio during full power TX to see the actual voltage to the radio.
>> (I have a digital LED meter connected  with small wires to the Anderson
> supply
>> wire right at the back of the radio on my K3 test bench).
>> Keith WE6R
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>