+++++++++++++++ From: "Rick Tilton" To: Cc: "Elecraft" Subject: RE: [Elecraft] K2 Part Question Date: Thu, 3 Jan 2002 08:41:59 -0500 > -----Original Message----- > I had a problem locating C6 also. It turned out that I had installed > it already (in error) as C73 which is supposed to be a 47 pf cap. The > particular part was poorly marked and the period was missing between > the 4 and 7. So I took the 4.7 to be a 47, you might want to check > that. The actual 47 pf caps were marked as 470 in my kit and not 47 > as noted in the parts list. Bingo! I think you may have hit the nail on the head! I noticed also that the C73 was poorly marked and MIGHT be a 4.7 or a 47. Soooo... I took it for a 47. However, I CANNOT find a 47 in my kit at all if the one I put in C73 is really a 4.7. However, I do have four 470J's that are small blue ones? Could they be the 47pF which almost has to be. I have 4 of those and the parts guide shows 4 of the 47pF as well. It does NOT show a 470 anywhere in the description of the 47pF caps. As a matter of fact I do not see a 470 anywhere in the parts descriptions. But hey there is a LOT of things I haven't seen!Hi. Oh ya.. Tom you were correct. I did forget to do the parts inventory on the RF section. Not sure why I did the others and not here unless I did the unforgiven and was working on it tired when I got to that section. I honestly didn't even realize I had forgot to do it until you asked! As the kids say "My bad". Can anyone confirm the small blue cap marked 470J on top line and COG100 on the bottom line is a 47pF cap? Thanks & 73.. Rick.. N4WYK ++++++++++++++++++++ Date: Thu, 03 Jan 2002 09:30:58 -0500 From: "David A. Belsley" To: Rick Tilton , n4zzk at mindspring.com, elecraft at mailman.qth.net Subject: RE: [Elecraft] K2 Part Question Yes, the 470 is a 47pf cap. The last zero is a power of 10. Thus, the 470 stands for 47*10^0 = 47*1 = 47. best wishes, dave belsley, w1euy --On Thursday, January 3, 2002 8:41 AM -0500 Rick Tilton wrote: >> -----Original Message----- >> I had a problem locating C6 also. It turned out that I had installed >> it already (in error) as C73 which is supposed to be a 47 pf cap. The >> particular part was poorly marked and the period was missing between >> the 4 and 7. So I took the 4.7 to be a 47, you might want to check >> that. The actual 47 pf caps were marked as 470 in my kit and not 47 >> as noted in the parts list. -- snip -- +++++++++++++++ Date: Sat, 05 Jan 2002 21:46:48 -0600 To: "Rick Tilton" , elecraft at mailman.qth.net From: Tom Hammond =?iso-8859-1?Q?N=D8SS?= Subject: Re: [Elecraft] Another K2 Capacitor Question.... Rick: >OK.. Now on page 62. Installing the capacitors. I cannot find anything >marked for C22 and C33 that is 3.3pF. I know the errata said they maybe >labeled 2R7 or 3R3 or the value could be 2.7pF or 3.3pF. However, I have >two capacitors left. They don't match ANYTHING that I can find. Can someone >translate them for me. One side is marked as follows: First line - 287 >Second line - A10. Back of cap has first line - 001 and second line - AHK. >What are they? I cannot find theses listed in the K2 RF Board Prts List. >Yes Tom this is the same batch I forgot to inventory! Yes I'm still beating >myself!UUGH! I hate lessons learned the hard way. Can anyone help translate >these? That 287 is really 2R7... maybe a bit blurred, but that's GOTTA be it! No such thing (that I'm aware of) as a 287 cap. Tom N0SS ++++++++++++++++++ From: "Andy Anderson W5VCJ" To: Subject: Re: [Elecraft] Another K2 Capacitor Question.... Date: Sat, 5 Jan 2002 22:32:45 -0600 Rick, Mine looked like 2R7 even with two magnifiers back to back. One looked a bit more like a 'R', and the other looked more like an '8' with at least most of the bottom missing. Put them: they work FB. Andy W5VCJ +++++++++++++++++++++ From: "Rick Tilton" To: "Elecraft" Subject: RE: [Elecraft] Another K2 Capacitor Question.... Date: Sat, 5 Jan 2002 23:33:24 -0500 > -----Original Message----- > That 287 is really 2R7... maybe a bit blurred, but that's GOTTA be it! No > such thing (that I'm aware of) as a 287 cap. > > Tom N0SS Thanks Tom! Guess I'm getting blurry eyed. I had to look at these in the lighted magnifying glass JUST to read them when I posted the message and still read them wrong!Hi. NOW I can continue on! Also had a 681 that looked like a 651 but finally part of it had rubbed off also after further scrutiny under the magnifying glass and looking thru the parts portion and found there was NO 651!Hi. Once again you have saved me! Thanks! 73.. Rick... N4WYK ... +++++++++++++++++++ From: "Don Wilhelm" To: "Jonathan Taylor, K1RFD" , Subject: Re: [Elecraft] Another K2 Capacitor Question.... Date: Sun, 6 Jan 2002 09:38:21 -0500 Jonathan, The ARRL Handbook has a digital capacitance meter adapter that is rather easy to build - use a DVM to display the values (yes, you can use a regular DMM). Sorry, but I don't recall the section - you will have to use the index to find it. I have built both the capacitance meter and the inductance meter and can say that they work FB. Mine is in a single box with a dedicated DVM but that takes a many pole switch to switch from capacitance to inductance - the easier way is to build 2 separate adapters. 73, Don W3FPR Don Wilhelm - Wake Forest, NC W3FPR home page: http://www.qsl.net/w3fpr/ QRP-L # 485 K2 SN 0020 mailto: w3fpr at arrl.net ----- Original Message ----- From: "Jonathan Taylor, K1RFD" > All of this discussion makes me think it would be great to have a > capacitance meter on the bench, yet this is something most hams probably > don't have. > > Has anyone seen a simple circuit which would allow capacitor values to be > checked using, say, a signal source, an RF probe, and a DMM? In other > words, a "capacitance probe"? ++++++++++++++++++ Date: Sun, 06 Jan 2002 08:49:27 +0000 From: Paul Hendershott To: "Jonathan Taylor, K1RFD" CC: elecraft at mailman.qth.net Subject: Re: [Elecraft] Another K2 Capacitor Question.... I picked up an "L/C Meter IIB" from "Almost All Digital Electronics" for around $99 before I started on my K2. It cleared up a lot of confusion I had between the difficult to read parts. I found it to be extremely accurate. The great thing is that it comes in a "kit" form or factory assembled! Nothing like building "kit test equipment" to build your K1 or K2 kit - very much in the Heathkit spirit of doing things. Only thing to watch out for - I was told by a few builders not to rely on it too much when measuring the toroids - trust the manual and the proper # of turns, etc.,. There were discrepancies between the measured L and what the manual stated the L should be, but my K2 worked FB following the instructions exactly. Paul KB9YVP "Jonathan Taylor, K1RFD" wrote: > All of this discussion makes me think it would be great to have a > capacitance meter on the bench, yet this is something most hams probably > don't have. +++++++++++++++++++ Reply-To: From: "Ron D' Eau Claire" To: Subject: RE: [Elecraft] Another K2 Capacitor Question.... Date: Sun, 6 Jan 2002 09:21:50 -0800 Jonathan, K1RFD, wrote > All of this discussion makes me think it would be great to have a > capacitance meter on the bench, yet this is something most hams probably > don't have. > > Has anyone seen a simple circuit which would allow capacitor values to be > checked using, say, a signal source, an RF probe, and a DMM? In other > words, a "capacitance probe"? Testing caps "in circuit" with some sort of probe is pretty hard since the stray capacitance of the other components and PCB often exceed the value of the capacitor being checked. More commonly a 'bad' capacitor is detected by its effect on the overall operation of a circuit. Out of the circuit, a capacitance checker is very useful. You may be right that many Hams lack one although I have gotten used to a capacitance testing feature in most modern DMM's. I have two DMM's and both of them, a Fluke and a relatively inexpensive (about US $70) Radio Shack unit provide capacitance checks. The Radio Shack meter does a good job on anything from electrolytics of hundreds of microfarads down to values of a few pf, if you subtract the stay capacitance reading of the meter itself. So if you are thinking of upgrading your DMM, getting one with a built-in capacitance meter might be the way to go. Also, I've gotten "spoiled" by the newer DMMs that let me plug in an unknown bipolar transistor and it immediately gives me both the hfe and the pinout! Ron AC7AC K2 # 1289 +++++++++++++++ Date: Sun, 06 Jan 2002 04:13:38 -0500 To: elecraft at mailman.qth.net From: "Jerry W. O'Dell" Subject: [Elecraft] Cap meters Lots of digital multimeters have capacitance as a standard feature. They're not terribly accurate, though. And the grid dip meters will do inductance, granted with great trouble. I have a Kelvin and Radio Shack that both do a creditable job of checking capacitance. 73 jerry w8gnd ++++++++++++++++ Date: Mon, 07 Jan 2002 17:40:29 -0600 To: "rich a." , elecraft at mailman.qth.net From: Tom Hammond =?iso-8859-1?Q?N=D8SS?= Subject: Re: [Elecraft] capacitor substitution & other problems Hi Rich: You wrote: >While assembling my KNB2 noise blanker I dropped, then stepped on and >broke C4, a 100pf blue mono cap. I've got a disk cap marked 101J, which >I think is also 100pf. Can I use it or do I need the blue mono cap? You should be able to use it, at least temporarily... I think I'd still consider replacing it later, just for aesthetic reasons. -- snip -- Good luck, Tom Hammond N0SS +++++++++++++++++ Date: Fri, 23 May 2003 11:13:09 -0700 From: Eric Swartz WA6HHQ - Elecraft Organization: Elecraft To: n2tk at arrl.net, Elecraft List Subject: Re: [Elecraft] K2 - part identification Yes, the NE602 and NE612 (and SA prefix versions) are equivalent. It should mention that in the manual in the parts list area or the text. 73, Eric WA6HHQ ---- ++++++++++++++++ Date: Tue, 27 May 2003 07:19:44 -0400 From: tjmc To: dfleming01 at comcast.net, Elecraft - reflector Subject: [Elecraft] finding parts on K2 > > >I am in the process of assembling the RF board for a K-2 serial number >> 3499 and cannot locate R65 (10 k. capacitor) > Dave ( and newer builders) It's been posted before but here we go agn.... If your looking for parts on the K2/k1/etc , just download the PDF doc for the schematic. You can use the FIND command and it will search the schematic for the part. It sure does save a lot of looking for this old eyes! all best Tom aa2vk +++++++++++++++