Don — I have just had a back-and-forth with Elecraft Parts about the same question.
The K2 Manual, dated March 2012, lists for C44, C46, C32, and C34 trimmers p/n E540001, 5-30pF. However, Revision I-3 dated September 1, 2015, lists for C32 and C34 p/n E540002, 10-50 pF; and for C44 and C46, p/n E540001, 5-30 pF. What I received in a kit ordered on Sept. 7 was apparently what the I-3 Revision called for - there were two white ceramic and two bright red plastic trimmers, with no markings on either to say which was which. When I inquired, Parts told me (two days ago) that the red plastic trimmers were p/n E540001, and that (here’s the quote), "we'll send the 4 E540002 trimmers. The E540001 trimmers are obsolete and you can use the E540002 trimmers in place of them.” Taking this together with your note leaves me wondering . . . Help? As an aside, the C21 and C23 values are listed in both the Manual and the Revision as p/n 540000, 8-50 pF. Ted, KN1CBR >Message: 29 >Date: Fri, 2 Oct 2015 08:28:07 -0400 >From: Don Wilhelm <w3...@embarqmail.com> >To: andrew <a...@bigpond.com>, elecraft@mailman.qth.net >Subject: Re: [Elecraft] [K2] Band-Pass Filter Trimcap values >Message-ID: <560e7857.1080...@embarqmail.com> >Content-Type: text/plain; charset=windows-1252; format=flowed > >Andrew, > >C21 and C23 are good with the ceramic capacitors with the red dot - use >those supplied with your kit. >C32 and C34 need approximately 25 pF to tune, and your current brown >trimmers should do the job nicely. >For C44 and C46 the capacity needed is approximately 10 pF (the brown >body trimmers will *not* work). >The trimmers currently being supplied for use at C44 and C46 are PN >E540011 and have a red body. > >If you ordered your K2 in the last quarter of 2014 the kit was supplied >with 4 brown bodied trimmer capacitors (that was corrected in >December), which were supposed to have a minimum capacity of 6pF but >the actual minimum capacity is more like 20pF. I don't know if the >manufacturer had an incorrect value on the data sheet, or what happened, >but the actual range of those brown trimmers is nominally 20 to 60pF. > >So bottom line, the brown trimmers will work fine at C32 and C34 and are >what is currently being supplied in new kits. >The trimmers now being used for C44 and C46 are PN E540011 and have a >red body. You can request those from parts (at) elecraft.com. > >If you want to procure trimmers locally, and you can fine 5-30pF >trimmers, they will work, but watch the minimum capacitance of anything >you substitute, particularly for C44 and C46. > >73, >Don W3FPR > > >On 10/2/2015 6:04 AM, andrew wrote: >> During initial build I didn't have a signal generator and wasn't happy >>with the band-pass filter alignment for the 12m and 17m bands which use >>trimcaps. >> Revisiting the alignment with a newly acquired signal generator I found >>I couldn't get a correct adjustment and removed C46 - it's maximum value >>is 66pF when it should be approx 30pF. >> I removed C32, C34 and C44 and all have a max of approx 66pF. I also >>checked C21 and C23 which are correct with a maximum of 50pF. (and >>different physical construction with Red mark) >> Before I make replacements I would like to confirm that the correct >>values should be: >> >> C21, C23 = max 50pF >> C32, C34, C44, C46 = max 30pF >> >**************************************** ______________________________________________________________ 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
