Solder Question
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I just received my K2 today, serial# 4998. I was wondering if the Kester solder I have, 244-6337-8800 which is a 245 NO CLEAN FLUX CORE SOLDER, ALLOY-63/37, .031' can be used to build the k2?
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I just received my K2 today, serial# 4998. I was wondering if the Kester solder I have, 244-6337-8800 which is a 245 NO CLEAN FLUX CORE SOLDER, ALLOY-63/37, .031' can be used to build the k2? You sure can Bob...245 is a no-clean type of solder that is just fine for using on electronic devices. 73, Joe W2KJ I QRP, therefore, I am _______________________________________________ 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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In reply to this post by Bob Wehking
Bob asked:
I just received my K2 today, serial# 4998. I was wondering if the Kester solder I have, 244-6337-8800 which is a 245 NO CLEAN FLUX CORE SOLDER, ALLOY-63/37, .031' can be used to build the k2? ______ The 245 is a good rosin core solder that a lot of builders have used just fine, Bob. The Kester 44 is listed in the manuals because it's the "traditional" activated rosin core solder. Its flux may produce slightly better cleaning action. About the size, 0.031 is the size I use most commonly. Some builders prefer an even smaller solder. The trick is to avoid over-filling the pads. Since the holes are plated through, there's no need for fillets and they can cause you grief. One common problem is over-filling the pads for crystals so a solder fillet occurs out of sight under the crystal, shorting the circuit to the grounded crystal case. When that happens in the I.F. filters the effect is a 'deaf' radio and it's really tough to figure out why! So whatever size solder you use, avoid pushing too much of it into a joint. For the record, here's what Kester has to say about their 245 and the 44 fluxes. "Kester 245 No-clean Cored Wire was developed to complement low residue liquid fluxes being used by the electronics industry. The chemistry is based on some of the same principles that have been safely used for years in mildly activated rosin fluxes. The use of 245 No-clean Cored Wire results in visually acceptable assemblies without cleaning, yet soldering quality and efficiency is comparable to that obtained with mildly activated rosin flux." (http://tinyurl.com/ach76) "Kester 44 Rosin Flux is an activated rosin formula for use in flux-cored solder wire. Kester 44 Rosin Flux has virtually dominated the field of activated rosin core solders for well over four decades. An outstanding performance feature of this flux is the "instant-action" wetting behavior. The high mobility and fast-spreading action of this flux results in more reliable production line soldering....When exposed to an elevated temperature and humidity environment (38°C, 94% RH) for 72 hours, there is no evidence of corrosion caused by the flux residue. Throughout its many years of wide usage, 44 Rosin Flux has produced many billions of soldered connections. In all these billions of solder joints, involving the most delicate and critical of electrical and electronic components, there has never been an authentic instance of corrosion by the flux residue under normal conditions of use." (http://tinyurl.com/8nqrx) Ron AC7AC _______________________________________________ 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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In reply to this post by Bob Wehking
Good Morning Group,
4991 seems to be coming along nicely, but I have a question. I have finished the Front Panel Board. I added the "extra" components for KSB2 per instructions on page 28. 1. Resistance checks for U1 pins 1 & 2 are out of spec. Chart says 25 - 35 K for both pins. DMM reads 17 K for both. Old analog meter reads 8 - 9 K for both. 2. Resistance checks for J1 pin 15 is out of spec. Chart says 10 - 60 K. Analog meter reads 80 K. Perhaps the resistance chart does not take the added SSB stuff into account? U1 pin 1 and J1 pin 15 are both associated with this added circuitry. Ya think I'm OK? TIA, 73, Tom, W3QS _______________________________________________ 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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tom.w3qs wrote:
> 1. Resistance checks for U1 pins 1 & 2 are out of spec. Chart says 25 - 35 > K for both pins. DMM reads 17 K for both. Old analog meter reads 8 - 9 K > for both. > > 2. Resistance checks for J1 pin 15 is out of spec. Chart says 10 - 60 K. > Analog meter reads 80 K. > > Perhaps the resistance chart does not take the added SSB stuff into account? > U1 pin 1 and J1 pin 15 are both associated with this added circuitry. I did the same build you did (well, on S/N 1641 anyway)...and noted the resistance check values after adding the KSB2 components using a Triplett 2030A DMM. U1 pins 1 & 2 : 30Kohm J1 pin 15: 31Kohm So whatever the reason for what you're seeing, I don't think we can blame it on the KSB components being present. You might want to inspect things again. It's *very* easy to overlook soldering a pin or two on the LCD or one of the processor chips, and have things sorta almost work anyway because the pin's in a plated-through hole making intermittant contact. I did that more than once. 73 de Maggie K3XS -- -----/___. _)Margaret Stephanie Leber CCP, SCJP/"The art of progress / ----/(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ ---/ / | / | _ _ _ ` _ AOPA 925383/ amid change and to / --/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ -/ (_/ ' .-/ .-/ ARRL 39280 /order."-A.N.Whitehead/ /________________(_/_(_/_______AMSAT 32844_/<[hidden email]>/ _______________________________________________ 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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Hi Maggie,
Thank you so much for responding, I was afraid everyone was out fourthing. I seriously hoped you were wrong about checking the soldering on U1 as the pins are hidden by the glass-thing on the front side. But, I dutifully checked everything again and made an absolutely ghastly discovery!!! I can't operate a DMM! Seriously, I wouldn't have thought it would make a difference on resistance checking, but I guess that is not the case. I had done the checking by probing with the common lead while the other lead was grounded. I reversed the connections, and now all checks are within normal range. Many of the other checks are different, now, but they had been in-range before. Well, I guess you're never too old to learn something. This is my first DMM, always done it with analog meters before. Thanks and have a great fourth! On to the rest of the adventure! Tom, W3QS -----Original Message----- From: Margaret Leber [mailto:[hidden email]] Sent: Saturday, July 02, 2005 11:51 AM To: tom.w3qs Cc: [hidden email] Subject: Re: [Elecraft] K2 Build Question tom.w3qs wrote: > 1. Resistance checks for U1 pins 1 & 2 are out of spec. Chart says > 25 - 35 K for both pins. DMM reads 17 K for both. Old analog meter > reads 8 - 9 K for both. > > 2. Resistance checks for J1 pin 15 is out of spec. Chart says 10 - 60 K. > Analog meter reads 80 K. > > Perhaps the resistance chart does not take the added SSB stuff into account? > U1 pin 1 and J1 pin 15 are both associated with this added circuitry. I did the same build you did (well, on S/N 1641 anyway)...and noted the resistance check values after adding the KSB2 components using a Triplett 2030A DMM. U1 pins 1 & 2 : 30Kohm J1 pin 15: 31Kohm So whatever the reason for what you're seeing, I don't think we can blame it on the KSB components being present. You might want to inspect things again. It's *very* easy to overlook soldering a pin or two on the LCD or one of the processor chips, and have things sorta almost work anyway because the pin's in a plated-through hole making intermittant contact. I did that more than once. 73 de Maggie K3XS -- -----/___. _)Margaret Stephanie Leber CCP, SCJP/"The art of progress / ----/(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ ---/ / | / | _ _ _ ` _ AOPA 925383/ amid change and to / --/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ -/ (_/ ' .-/ .-/ ARRL 39280 /order."-A.N.Whitehead/ /________________(_/_(_/_______AMSAT 32844_/<[hidden email]>/ _______________________________________________ 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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On: Saturday, July 02, 2005 2:42 PM
"tom.w3qs" <[hidden email]> > ... > I had done the checking by probing with the common lead while the other lead > was grounded. I reversed the connections, and now all checks are within > normal range. Many of the other checks are different, now, but they had > been in-range before. > ... This error has been made before. Polarity of resistance checks do not normally make a difference because you are probing a pure resistance. Circuit checks are different because there are actually active components that will act differently depending upon the polarity and magnitude of the voltage applied by the DMM. This is also the reason that Auto-Ranging is not recommended. Use the correct range for the expected reading and readings will often look closer to what the manual indicates. This comes up often enough that maybe there should be a builder's note in the manual. 73, Fran, KA4FRH K2 s/n 314 _______________________________________________ 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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In reply to this post by tom.w3qs
Hi Tom,
There are some subtlties to making measurements of all sorts, but sometimes even simple one with a DMM! I also thought I had a problem when measuring some resistances checks during the build of my K2 a few months back. Turned out that I figured it would be more convenient to just move one probe around without having to hold the other on ground, so I let the ground lead sort of loosely sit in one of the 3D metal connectors while I proved with the other lead on the designated pins. I too had some out of tolerance measurements, higher resistance than specified. When I remeasured by clipping onto one of the "U" shaped ground leads directly on the board that I was doing measurements I found that everything was good. Another time I was getting very low resistance and intermittent measurements during another check. That time I reallized that I had the board resting on some of the black conductive foam that IC's are mounted on during shipment. The foam helped keep the board from moving around as much while I was probing, but the extra short circuits were not helpful in the measurements. Note to self: Don't power up any circuits while board is sitting on conductive foam! 73, Mark, NK8Q K2 4786 >From: "tom.w3qs" <[hidden email]> >Date: Sat Jul 02 13:42:32 CDT 2005 >To: 'Margaret Leber' <[hidden email]> >Cc: [hidden email] >Subject: RE: [Elecraft] K2 Build Question >Hi Maggie, > >Thank you so much for responding, I was afraid everyone was out fourthing. > >I seriously hoped you were wrong about checking the soldering on U1 as the >pins are hidden by the glass-thing on the front side. > >But, I dutifully checked everything again and made an absolutely ghastly >discovery!!! > >I can't operate a DMM! > >Seriously, I wouldn't have thought it would make a difference on resistance >checking, but I guess that is not the case. > >I had done the checking by probing with the common lead while the other lead >was grounded. I reversed the connections, and now all checks are within >normal range. Many of the other checks are different, now, but they had >been in-range before. > >Well, I guess you're never too old to learn something. This is my first >DMM, always done it with analog meters before. > >Thanks and have a great fourth! > >On to the rest of the adventure! > >Tom, W3QS > >-----Original Message----- >From: Margaret Leber [mailto:[hidden email]] >Sent: Saturday, July 02, 2005 11:51 AM >To: tom.w3qs >Cc: [hidden email] >Subject: Re: [Elecraft] K2 Build Question > >tom.w3qs wrote: > >> 1. Resistance checks for U1 pins 1 & 2 are out of spec. Chart says >> 25 - 35 K for both pins. DMM reads 17 K for both. Old analog meter >> reads 8 - 9 K for both. >> >> 2. Resistance checks for J1 pin 15 is out of spec. Chart says 10 - 60 K. >> Analog meter reads 80 K. >> >> Perhaps the resistance chart does not take the added SSB stuff into >account? >> U1 pin 1 and J1 pin 15 are both associated with this added circuitry. > >I did the same build you did (well, on S/N 1641 anyway)...and noted the >resistance check values after adding the KSB2 components using a Triplett >2030A DMM. > >U1 pins 1 & 2 : 30Kohm >J1 pin 15: 31Kohm > >So whatever the reason for what you're seeing, I don't think we can blame it >on the KSB components being present. You might want to inspect things again. >It's *very* easy to overlook soldering a pin or two on the LCD or one of the >processor chips, and have things sorta almost work anyway because the pin's >in a plated-through hole making intermittant contact. I did that more than >once. > > 73 de Maggie K3XS > >-- >-----/___. _)Margaret Stephanie Leber CCP, SCJP/"The art of progress / >----/(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ >---/ / | / | _ _ _ ` _ AOPA 925383/ amid change and to / >--/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ >-/ (_/ ' .-/ .-/ ARRL 39280 /order."-A.N.Whitehead/ >/________________(_/_(_/_______AMSAT 32844_/<[hidden email]>/ > > > > >_______________________________________________ >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 _______________________________________________ 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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In reply to this post by tom.w3qs
It would have done the same with an analog meter, Tom. The circuit you were
probing undoubtedly contained semiconductors (ICs, transistors, diodes, etc.), not just pure resistors. With the leads one way, the internal battery in the DMM causes some of those semiconductor junctions to be forward biased and some of them to be reverse biased (depending on what they are and how they are connected). So the readings one way are different than the readings the other way...just like when you use an ohmmeter to check a diode. Have a great 4th. And enjoy the K2. It is a great rig. Eric KE6US -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of tom.w3qs Sent: Saturday, July 02, 2005 11:43 AM To: 'Margaret Leber' Cc: [hidden email] Subject: RE: [Elecraft] K2 Build Question Hi Maggie, Thank you so much for responding, I was afraid everyone was out fourthing. I seriously hoped you were wrong about checking the soldering on U1 as the pins are hidden by the glass-thing on the front side. But, I dutifully checked everything again and made an absolutely ghastly discovery!!! I can't operate a DMM! Seriously, I wouldn't have thought it would make a difference on resistance checking, but I guess that is not the case. I had done the checking by probing with the common lead while the other lead was grounded. I reversed the connections, and now all checks are within normal range. Many of the other checks are different, now, but they had been in-range before. Well, I guess you're never too old to learn something. This is my first DMM, always done it with analog meters before. Thanks and have a great fourth! On to the rest of the adventure! Tom, W3QS -----Original Message----- From: Margaret Leber [mailto:[hidden email]] Sent: Saturday, July 02, 2005 11:51 AM To: tom.w3qs Cc: [hidden email] Subject: Re: [Elecraft] K2 Build Question tom.w3qs wrote: > 1. Resistance checks for U1 pins 1 & 2 are out of spec. Chart says > 25 - 35 K for both pins. DMM reads 17 K for both. Old analog meter > reads 8 - 9 K for both. > > 2. Resistance checks for J1 pin 15 is out of spec. Chart says 10 - 60 K. > Analog meter reads 80 K. > > Perhaps the resistance chart does not take the added SSB stuff into account? > U1 pin 1 and J1 pin 15 are both associated with this added circuitry. I did the same build you did (well, on S/N 1641 anyway)...and noted the resistance check values after adding the KSB2 components using a Triplett 2030A DMM. U1 pins 1 & 2 : 30Kohm J1 pin 15: 31Kohm So whatever the reason for what you're seeing, I don't think we can blame it on the KSB components being present. You might want to inspect things again. It's *very* easy to overlook soldering a pin or two on the LCD or one of the processor chips, and have things sorta almost work anyway because the pin's in a plated-through hole making intermittant contact. I did that more than once. 73 de Maggie K3XS -- -----/___. _)Margaret Stephanie Leber CCP, SCJP/"The art of progress / ----/(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ ---/ / | / | _ _ _ ` _ AOPA 925383/ amid change and to / --/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ -/ (_/ ' .-/ .-/ ARRL 39280 /order."-A.N.Whitehead/ /________________(_/_(_/_______AMSAT 32844_/<[hidden email]>/ _______________________________________________ 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 _______________________________________________ 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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