[Elecraft] KRC2 silkscreen gotcha

[Paul GACEK]

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like a champ with my K2 but not so with my KX3.

I’m going to crack open my krc2 shortly and see what values I have in those two resistor locations.

What radio where you using with the KRC2?

Paul
W6PNG/M0SNA 
www.nomadic.blog

> On Nov 19, 2020, at 12:47 PM, Wes <wes_n7ws at triconet.org> wrote:
> 
> Thanks.  I've owned one of these for years and as I recall, it's always been a problem so it's been resigned to the junk box.
> 
> Maybe I can resurrect it to make it useful for something.
> 
> Wes  N7WS
> 
>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>> 
>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>> around it was evident there was no negative voltage to the RS232 driver, U2.
>> A little further probing revealed no 12V present at R13 but there was at
>> R12. It was then I realised the component layout in the manual is different
>> to that marked on the PCB. A quick swap of resistors and everything works as
>> it should.
>> 
>> I've re-read the errata and the manual and there is no reference to this
>> issue. Apologies if it's been flagged up on here already but I couldn't find
>> anyone pointing this out though there do seem to be a few people with serial
>> comms issues with the KRC2.
>> 
>> Hopefully this is of assistance to someone.
>> 
>> 73 Paul M1PAF
> 
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