Should be fine - you don’t have the issue I had.
> On 19 Nov 2020, at 23:37, Rich <rwnewbo...@comcast.net> wrote: > > Well I have a negative voltage on U2 pin8 but it is 3 volts higher than the > manual. Probably not an issue > > Rich > > On 11/19/2020 16:58 PM, Paul Fletcher wrote: >> The circuit diagram and the parts placement in the manual are correct. On >> mine it was the silkscreen for R12 and R13 that was reversed. Let Jack do >> some digging as it’s possible (from his comments) that this doesn’t affect >> all boards. Mine only arrived a few days ago. The easy way to check if there >> is an issue is to check there is the correct negative voltage on pin 8 of >> U2. Mine was almost 0V before swapping the resistors. >> >>> On 19 Nov 2020, at 21:41, Rich <rwnewbo...@comcast.net >>> <mailto:rwnewbo...@comcast.net>> wrote: >>> >>> 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 <http://www.nomadic.blog/> >>>> >>>>> On Nov 19, 2020, at 12:47 PM, Wes <wes_n...@triconet.org> >>>>> <mailto:wes_n...@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 >>>>> <http://mailman.qth.net/mailman/listinfo/elecraft> >>>>> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm> >>>>> Post: mailto:Elecraft@mailman.qth.net <mailto:Elecraft@mailman.qth.net> >>>>> >>>>> This list hosted by: http://www.qsl.net <http://www.qsl.net/> >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> <http://www.qsl.net/donate.html> >>>>> Message delivered to paul.ga...@mac.com <mailto:paul.ga...@mac.com> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> <http://mailman.qth.net/mailman/listinfo/elecraft> >>>> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm> >>>> Post: mailto:Elecraft@mailman.qth.net <mailto:Elecraft@mailman.qth.net> >>>> >>>> This list hosted by: http://www.qsl.net <http://www.qsl.net/> >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> <http://www.qsl.net/donate.html> >>>> Message delivered to rwnewbo...@comcast.net <mailto:rwnewbo...@comcast.net> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> <http://mailman.qth.net/mailman/listinfo/elecraft> >>> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm> >>> Post: mailto:Elecraft@mailman.qth.net <mailto:Elecraft@mailman.qth.net> >>> >>> This list hosted by: http://www.qsl.net <http://www.qsl.net/> >>> Please help support this email list: http://www.qsl.net/donate.html >>> <http://www.qsl.net/donate.html> >>> Message delivered to paul_fletc...@me.com <mailto:paul_fletc...@me.com> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@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 arch...@mail-archive.com
