[Elecraft] KRC2 silkscreen gotcha

[Rich]

Thanks for the info.   Could you post the correct value of R12 and R13?

Mine was back at Elecraft way back.   I want to make sure it is already 
not corrected

Based on your info R12 should be 47ohm, correct?


Thanks

Rich

On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:
> 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
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to paul.gacek at mac.com
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to rwnewbould at comcast.net