K2 RF board, NPO capacitors
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Hi all, hope someone can offer some advice on this.
I'm building K2 #5551 and was concerned that most of the RF board capacitors listed as NPO appeared to be ordinary blue resin-dipped ones. I mailed Elecraft tech support a few days ago to enquire if the caps supplied were NPO (zero temperature coefficient dielectric) or whether that spec was still required. Guess I must have done something wrong because I got no reply, so can anyone who's "been there, done that" kindly advise, please? I need to order a missing 68pF NPO from Farnell and if necessary, could re-order all the NPO caps, just to be sure. Grateful thanks in advance for any assistance. 73 Dave (soon to resurrect my old G3 licence) _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K2 RF board, NPO capacitors
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Hi Dave,
Some manufacturers do supply NPO and COG capacitors that are blue resin-dipped. I have seen other colours but blue seems to be the favourite. The small blue capacitors that Elecraft supplied for my K2 #3255 RF board are NPO types, which would be required in the tuned circuits of the K2. Other temperature coefficients might be required if temperature compensation was being attempted, but this is not the case in the K2. Farnell does sell NPO and COG capacitors as well as the 'usual' type of disc ceramic, just watch the voltage rating. Please let me know if I can be of any further help. 73, Geoff GM4ESD David Lankshear wrote: > I'm building K2 #5551 and was concerned that most of the RF board > capacitors > listed as NPO appeared to be ordinary blue resin-dipped ones. > > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K2 RF board, NPO capacitors
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In reply to this post by DaveL G3TJP
Hi David,
The blue resin dipped caps actually -are- the NP0 type. :-) Caps can appear in a variety of forms and colors and they do not directly correlate to the type. (Also, the 68 pF cap you think is missing may be marked either as "680" (68 times ten to the zero = 68pf) or as just "68", depending upon the manufacturer. 680 pF will be marked as "681". (Note: NP0 and C0G caps are effectively the same for our usage.) . I just checked with Scott in our parts department and he doesn't recall seeing your email. (We save all emails and replies.) Did you send it to [hidden email]? If so, you would have received an automated receipt reply immediately. In general email: [hidden email] - for missing parts, identification questions and spare parts orders. [hidden email] - for problems debugging and operating your Elecraft kit. [hidden email] - for orders, shipment status and follow up if you have not received a reply from parts or support after 2-3 business days. As a general note, we frequently get emails sent to us late Friday or over the weekend. Its not unusual for someone to email us again even later that night or on Saturday or Sunday asking why we haven't replied. I guess everyone thinks we never sleep at Elecraft central. ;-) That's probably our fault since we frequently get a little obsessive and check email over the weekend and late at night. Also, don't forget that we are in California and mat be in a different time zone from you. (And for international customers our holidays may be different than yours.) When we get into work on Monday it can take a day for us to reply to all of the parts and support email backlog from over the weekend. We do put extra support staff on email Mondays, but since many builders build on the weekend, or open their kit for the first time, that is one of our highest email volume periods. And always, if all else fails, or if it is urgent, please call us at 831-662-8345 Mon-Fri and/or email [hidden email] if you are having trouble reaching [hidden email] or [hidden email] . 73, Eric WA6HHQ Elecraft P.S. Many of our missing parts requests are actually due to customer mis-identification of a part, of from customer mis-placement of a part. Its not unusual for us to get a follow up email saying "never mind!" right after we send out the spare part. :-) Don't forget to fully inventory your kit! :-) ------- David Lankshear wrote: > Hi all, hope someone can offer some advice on this. > > I'm building K2 #5551 and was concerned that most of the RF board > capacitors > listed as NPO appeared to be ordinary blue resin-dipped ones. > > I mailed Elecraft tech support a few days ago to enquire if the caps > supplied were NPO (zero temperature coefficient dielectric) or whether > that > spec was still required. Guess I must have done something wrong because I > got no reply, so can anyone who's "been there, done that" kindly advise, > please? > > I need to order a missing 68pF NPO from Farnell and if necessary, could > re-order all the NPO caps, just to be sure. > > Grateful thanks in advance for any assistance. Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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