Hello Ted From your callsign I'm assuming your are in the USA, in which case I would recommend sourcing any required parts direct from Elecraft. I'm in VK-land so it was expedient to source locally.
The values I had success with are noted below, which tallies with the advice from Don and the updated errata I-3. Best wishes with your K2 build. Andrew vk6wax ---- "Dauer wrote: > Andrew — > > What is the source? I am still wrestling with this problem. > > Tnx, > > Ted, KN1CBR ---- andrew <a...@bigpond.com> wrote: > Hello Don > Thanks very much for the useful information. > I was able to source some trimcaps with the correct pin-spacing and a nominal > range of 3 - 30pF. > The maximum values used bacame: > C21, C23, C32, C34 = 50pF > C44, C46 = 30pF > These resulted in all bands being easily tuned for peak output close to the > middle of the trimming adjustment. > Thanks again. > Andrew > vk6wax > > ---- Don Wilhelm <w3...@embarqmail.com> wrote: > > 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
