Re: [Elecraft] K2 - Stumble at the last hurdle.
Mark, Did you measure C44 and C46 through the entire range of rotation? and what is the color of the plastic bodies? The last I knew, they were about 20pF maximum and the bodies were red. The others do not have a sufficiently low capacity to tune 12 meters. Similarly for C21 and C23 which the last I knew were yellow or brown. If those capacitor pairs are swapped, you would have the problems you describe. 73, Don W3FPR On 11/11/2021 5:30 AM, M Bak wrote: This is my 2nd K2 build this year. This fantastic kit has kept me sane. I tested every component on an LCR meter (found RFC10 open) and tried to work as slowly as possible. I got to the end of the build to the very last alignment step.-- The adjustment of C44 and C46 for the 12 meter band and I can only get 0.2W. 10 meters is fine with adjusting L12 and L13 but 12 meters (which I do not use but it should work) is nada. I had the exact same problem on 20meters but careful tweaking of C21/23 and L8/9 and it burst into life. When testing the capacitors I noticed they had quite a wide tolerance range. Could the band pass range for the 10 and 12 meter bands be too high? Any ideas would be appreciated. I am quite good at wondering down rabbit holes. Rgds. Mark G4RUR __ 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
Re: [Elecraft] K2 - Stumble at the last hurdle.
Marc, Please check the placement of those trimmer caps. If you follow the old parts list, it is easy to swap C21 and C23 with C44 and C46. If this is a recent kit, C44 and C46 should be red. While the others will be brown. I just serviced one here that had the same issue and those trimmer caps were swapped. 73, Dave, W8FGU On 11/11/2021 5:30:18 AM, "M Bak" wrote: This is my 2nd K2 build this year. This fantastic kit has kept me sane. I tested every component on an LCR meter (found RFC10 open) and tried to work as slowly as possible. I got to the end of the build to the very last alignment step.-- The adjustment of C44 and C46 for the 12 meter band and I can only get 0.2W. 10 meters is fine with adjusting L12 and L13 but 12 meters (which I do not use but it should work) is nada. I had the exact same problem on 20meters but careful tweaking of C21/23 and L8/9 and it burst into life. When testing the capacitors I noticed they had quite a wide tolerance range. Could the band pass range for the 10 and 12 meter bands be too high? Any ideas would be appreciated. I am quite good at wondering down rabbit holes. Rgds. Mark G4RUR Das Beste Oder Nichts __ 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 d...@w8fgu.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
[Elecraft] K2 - Stumble at the last hurdle.
This is my 2nd K2 build this year. This fantastic kit has kept me sane. I tested every component on an LCR meter (found RFC10 open) and tried to work as slowly as possible. I got to the end of the build to the very last alignment step.-- The adjustment of C44 and C46 for the 12 meter band and I can only get 0.2W. 10 meters is fine with adjusting L12 and L13 but 12 meters (which I do not use but it should work) is nada. I had the exact same problem on 20meters but careful tweaking of C21/23 and L8/9 and it burst into life. When testing the capacitors I noticed they had quite a wide tolerance range. Could the band pass range for the 10 and 12 meter bands be too high? Any ideas would be appreciated. I am quite good at wondering down rabbit holes. Rgds. Mark G4RUR Das Beste Oder Nichts __ 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
