Thermistor board
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Either I am missing something or this is just crazy. I have the board
made up, put down in place and soldered, but I don't see any way I am going to get any other components in there with out them shorting out. How on earth is this supposed to work? Can I put electrical tape on the back side of this thing or something? -- David Wilburn [hidden email] K4DGW S/N 5982 _______________________________________________ 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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Build it small, build it tight. I used a hydraulic press to make sure
the components were pushed down tight to the board before soldering ... well, maybe not :-) ... But it does pay to keep things as small and tight as reasonably possible so you'll have some space around the board. Mine looked tight but things did fit around with no shorting issues. - Keith N1AS - - K2 5411.ssb.100 - -----Original Message----- From: David Wilburn Either I am missing something or this is just crazy. I have the board made up, put down in place and soldered, but I don't see any way I am going to get any other components in there with out them shorting out. How on earth is this supposed to work? Can I put electrical tape on the back side of this thing or something? _______________________________________________ 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 dave.wilburn
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Hash: SHA1 When I put mine in, I noticed that I had messed up and put the wires running out the wrong side of the board. That makes a big difference in how it fits. I left mine as is, and no problems at all with shorts, though I have this thing in the back of my mind that says I need to fix it and do it right some day. It is quite cramped there. On Feb 6, 2007, at 12:47 PM, David Wilburn wrote: > Either I am missing something or this is just crazy. I have the > board made up, put down in place and soldered, but I don't see any > way I am going to get any other components in there with out them > shorting out. How on earth is this supposed to work? Can I put > electrical tape on the back side of this thing or something? > -- > > David Wilburn > [hidden email] > K4DGW > S/N 5982 > > _______________________________________________ > 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 Randy Rathbun NV0U [hidden email] K2 #1981 KX1#1318 QRPARCI #10776, ARS #895, FPQRP #1292, KCQRP #1 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (Darwin) iD8DBQFFyNcP6zTmfegBFIERAqR3AKCZO5b0t1QfUm3SidSp97W29FVOVgCgoSsg PGDcWAhmtYTu4nrWatboi2s= =3YNp -----END PGP SIGNATURE----- _______________________________________________ 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 dave.wilburn
Dave, It's tight, but everything will fit. Be sure the leads coming out of the thermistor board bend immediately 90 deg to the RF board. Also take a good long hard look at your solder joints on that little thing. The holes are not clad, so solder does not flow there like the rest of the kit. My only problem with the whole kit was a joint on the thermistor board. I looked at it several times and signed it off as good. I had to do a great deal of disassmbly to find out that was my problem afterall. I just finished up my K2/100 yesterday and enjoyed my first QSOs last night. Chuck K4QS _______________________________________________ No banners. No pop-ups. No kidding. Make My Way your home on the Web - http://www.myway.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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Yea, it is a mess. I have one bridge, but I think that is where they
come together anyway (the tail end of three of the resistors right next to the connector) because I can't get it cleared up. If I have problems that are on that circuit, it will be the first place I look. David Wilburn [hidden email] Chuck wrote: > > > > > Dave, > > > > It's tight, but everything will fit. Be sure the leads coming out of the thermistor board bend immediately 90 deg to the RF board. > > > > Also take a good long hard look at your solder joints on that little thing. The holes are not clad, so solder does not flow there like the rest of the kit. > > > > My only problem with the whole kit was a joint on the thermistor board. I looked at it several times and signed it off as good. I had to do a great deal of disassmbly to find out that was my problem afterall. > > > > I just finished up my K2/100 yesterday and enjoyed my first QSOs last night. > > > > Chuck K4QS > > _______________________________________________ > No banners. No pop-ups. No kidding. > Make My Way your home on the Web - http://www.myway.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 Chuck-51
Along these lines, is there a way to know that the thermistor board is
working properly? I'm guessing one would see drift, but are there more efficient, quantitative tests to ensure thermistor board function? Thanks, Jeff On 2/6/07, Chuck <[hidden email]> wrote: > > > > Dave, > > It's tight, but everything will fit. Be sure the leads coming out of the thermistor board bend immediately 90 deg to the RF board. > > Also take a good long hard look at your solder joints on that little thing. The holes are not clad, so solder does not flow there like the rest of the kit. > > My only problem with the whole kit was a joint on the thermistor board. I looked at it several times and signed it off as good. I had to do a great deal of disassmbly to find out that was my problem afterall. > > I just finished up my K2/100 yesterday and enjoyed my first QSOs last night. > > Chuck K4QS > > _______________________________________________ > No banners. No pop-ups. No kidding. > Make My Way your home on the Web - http://www.myway.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 > 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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VERY Good Question!!!!!!!
David Wilburn [hidden email] Jeff Kinzli wrote: > Along these lines, is there a way to know that the thermistor board is > working properly? I'm guessing one would see drift, but are there more > efficient, quantitative tests to ensure thermistor board function? > > Thanks, > > Jeff > > On 2/6/07, Chuck <[hidden email]> wrote: >> >> >> >> Dave, >> >> It's tight, but everything will fit. Be sure the leads coming out of >> the thermistor board bend immediately 90 deg to the RF board. >> >> Also take a good long hard look at your solder joints on that little >> thing. The holes are not clad, so solder does not flow there like the >> rest of the kit. >> >> My only problem with the whole kit was a joint on the thermistor >> board. I looked at it several times and signed it off as good. I had >> to do a great deal of disassmbly to find out that was my problem >> afterall. >> >> I just finished up my K2/100 yesterday and enjoyed my first QSOs last >> night. >> >> Chuck K4QS >> >> _______________________________________________ >> No banners. No pop-ups. No kidding. >> Make My Way your home on the Web - http://www.myway.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 >> > 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 dave.wilburn
Probably drift as you say. If the PLL Reference Oscillator Range test or VFO Linearization doesn't go like it should I'd suspect the thermistor board first. Chuck K4QS _______________________________________________ No banners. No pop-ups. No kidding. Make My Way your home on the Web - http://www.myway.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 dave.wilburn
Dave,
If you look at the back of the thermistor board, there is one place where 3 resistors come together just above pins 4 and 5, those are connected together. OTOH, a bit toward the right of that point you will see two resistors with the ends pointing at each other and the PC traces are quite close together - those should NOT be connected, it is easy to create a solder bridge at that point. If you want a resistance check, read the value between pins 5 and 6 - if it is zero, you have the solder bridge. 73, Don W3FPR > -----Original Message----- > > Yea, it is a mess. I have one bridge, but I think that is where they > come together anyway (the tail end of three of the resistors right next > to the connector) because I can't get it cleared up. If I have problems > that are on that circuit, it will be the first place I look. > > David Wilburn > [hidden email] > No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.28/672 - Release Date: 2/6/2007 10:22 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 Jeff Kinzli
Jeff,
If the PLL/VCO works, in all likelyhood, the thermistor board is functioning. If one wants to know how well it is working, drift measurements would have to be made after the K2 is assembled and tested in all other aspects. Making drift measurements is a tedious endeavor and to assure good measurements should be done in an environmental chamber. Experimental Methods in RF Design has a nice article showing how to make a small environmental chamber from a picnic cooler and a light bulb. 73, Don W3FPR > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]]On Behalf Of Jeff Kinzli > Sent: Tuesday, February 06, 2007 3:57 PM > To: [hidden email] > Cc: [hidden email] > Subject: Re: [Elecraft] Thermistor board > > > Along these lines, is there a way to know that the thermistor board is > working properly? I'm guessing one would see drift, but are there more > efficient, quantitative tests to ensure thermistor board function? > > Thanks, > > Jeff > > On 2/6/07, Chuck <[hidden email]> wrote: > > > > > > > > Dave, > > > > It's tight, but everything will fit. Be sure the leads coming > out of the thermistor board bend immediately 90 deg to the RF board. > > > > Also take a good long hard look at your solder joints on that > little thing. The holes are not clad, so solder does not flow > there like the rest of the kit. > > > > My only problem with the whole kit was a joint on the > thermistor board. I looked at it several times and signed it off > as good. I had to do a great deal of disassmbly to find out that > was my problem afterall. > > > > I just finished up my K2/100 yesterday and enjoyed my first > QSOs last night. > > > > Chuck K4QS > > > > _______________________________________________ > > No banners. No pop-ups. No kidding. > > Make My Way your home on the Web - http://www.myway.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 > > > _______________________________________________ > 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 > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.432 / Virus Database: 268.17.28/672 - Release Date: > 2/6/2007 10:22 AM > No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.28/672 - Release Date: 2/6/2007 10:22 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 |
Re: Thermistor board
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On Tuesday 06 February 2007 18:17, Don Wilhelm wrote:
> Experimental Methods in RF Design has a nice article showing how to make a > small environmental chamber from a picnic cooler and a light bulb. I made my wife a bread proofing box from two 27 inch television boxes, Styrofoam tiles, lots of duct tape, a 180 Watt hair styler that has its own fan, relay, MC68705, DS1620 and a control panel that lets her set it to 80 F or, if the ambient temperature is less than 40 F, such as it is now, 40 F. I'm planning to use a Peltier device in the future to allow it to go down to 40 F when the ambient temperature is above 40 F. Ian -- _______________________________________________ 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 Don Wilhelm-3
I am good to go then, as the one to the right is in good shape. I
followed up with the measurement and all is well. David Wilburn [hidden email] Don Wilhelm wrote: > Dave, > > If you look at the back of the thermistor board, there is one place where 3 > resistors come together just above pins 4 and 5, those are connected > together. OTOH, a bit toward the right of that point you will see two > resistors with the ends pointing at each other and the PC traces are quite > close together - those should NOT be connected, it is easy to create a > solder bridge at that point. If you want a resistance check, read the value > between pins 5 and 6 - if it is zero, you have the solder bridge. > > 73, > Don W3FPR > >> -----Original Message----- >> >> Yea, it is a mess. I have one bridge, but I think that is where they >> come together anyway (the tail end of three of the resistors right next >> to the connector) because I can't get it cleared up. If I have problems >> that are on that circuit, it will be the first place I look. >> >> David Wilburn >> [hidden email] >> > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.432 / Virus Database: 268.17.28/672 - Release Date: 2/6/2007 > 10:22 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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