Re: [Elecraft] Schematics for KPA500 REV "B"
Thanks for clarifying. So what can I understand from a small white label on the board, saying this: ? 17226 0812B OO31 I Am asking for the proper schematics because I can’t locate a certain 270 Ohm resistor on my physical PA board. This resistor appears on a “REV Ä” schematics from 02/16/11 (it’s part of the input attenuator I think). Isaac, 4Z1TL מאת: w4sc נשלח: Wednesday, 8 July 2020 16:28 אל: er...@netvision.net.il; elecraft@mailman.qth.net נושא: [Elecraft] Schematics for KPA500 REV "B" The “Rev” that is silkscreened on the board reflects the revision level of the bare board, NOT the assembly revision level of the module which will reflect changes made to the module and could any component, hardware, or circuit changes. The module revision level should be reflected on an attached label, written on the pwb (i.e. “ASSY C2”) in a conspicuous location, or not(?). Ben W4SC Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus __ 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] Schematics for KPA500 REV "B"
You are correct in your assertions,,, However you can/could/may have pwb changes to improve finished module performance, or cost, resulting in a new pwb with a lower rev level as its’ procurement part number would certainly change, and also resulting in a module assembly revision level change ( B to C?) and quite possibly an assembly part number and rev level change. It is all about tracking, and being able to determine (hopefully) what you are looking at and what documentation (schematics?) to relate to. Ben Sent from Mail for Windows 10 __ 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] Schematics for KPA500 REV "B"
"I have a PA board with "REV B" "silked" on it, but the schema I was supplied with is for "REV A". I know there are differences." I received KPA500 schematics from Elecraft about 2 years ago. This set includes sheets that are at rev C and rev D but the sheet "KPA 500 PA Module" is rev A. KPA500 LPF Bank, LPF Control, and TR Switch are all rev D I don't know the history of changes to the PA board but it would be possible to have a change to the PCB that did not require a change to the schematic - e.g. elimination of corrections made by cuts and jumpers. If there is a later version of the sheet "KPA 500 PA Module" I would like to have it too. (Pedant alert - The schematic really is titled "KPA 500" with a space, not "KPA500") Andy, k3wyc __ 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] Schematics for KPA500 REV "B"
The “Rev” that is silkscreened on the board reflects the revision level of the bare board, NOT the assembly revision level of the module which will reflect changes made to the module and could any component, hardware, or circuit changes. The module revision level should be reflected on an attached label, written on the pwb (i.e. “ASSY C2”) in a conspicuous location, or not(?). Ben W4SC Sent from Mail for Windows 10 __ 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] Schematics for KPA500 REV "B"
Hello all, I have a PA board with "REV B" "silked" on it, but the schema I was supplied with is for "REV A". I know there are differences. Anyone has the correct schema or some errata for " REV A " please? TIA Isaac (FWIW – can’t tell why is it s hard to obtain a proper KPA500 schematics? Every once in a while the question pops up & remains un-addressed.) -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus __ 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
