VCO Voltage Checks - 40m
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While troubleshooting the "original problem" below, I was making
changes, powering it up, checking, powering down, making changes, and at one point I had the radio off but 12v still on and connected. I decided to re-flow the connection at the junction of C68 where it connects to R17. There was a small spark, I stopped, turned off power, and disconnected it. On the next power up I had an Info message. I did not hear any relays, I think it may have been info 080, but not sure. I got the same message (what ever it was 080, 108, or 118) on the next power up. I cycled power again, and the relays kicked and I got the Elecraft display. Now the voltage reading for ALL bands is 7.94. It seems the instant grounding of the input of Q18 (with my ***verified*** grounded soldering iron) is not desirable. And just to make it interesting, when ever I figure out what gave way to the instant grounding, and get the part(s) in on-site, and re-installed, I will likely have the "original problem" there waiting for me. Seems to me I read somewhere that you shouldn't stay after it after getting tired, cause you will make bad decisions. Seems to me, it was even mentioned in a discussion with NU4I (Ken Moorman) today on the phone. Some people's kids, they just don't learn. Original problem ===================================================================== The voltage readings for 7000/7300 are 7.92. It is not much above the window of 7.5, but they do not vary with frequency as the others do. All other voltages are well within tolerances. Adjustments to L30, do not change the voltage on the 7k range of frequencies. I have installed D19, and D20, and C71 is a 120pf cap. They are part of the rework eliminators supplied items. I have verified C71-C74, and D21-D26. I have re-flowed all the solder connections associated with K13, K14, and K15, and most of the surrounding circuitry. Band Low Freq Voltage High Freq Voltage ==== ======== ======= ========= ======= 80m 3500 2.308 4000 5.99 40m 7000 7.94 7300 7.94 30m 10000 3.120 10150 3.677 20m 14000 2.587 15000 4.27 17m 18000 3.333 18200 3.539 15m 21000 2.482 21450 3.656 12m 24800 4.22 25000 4.61 10m 28000 3.512 28800 4.39 -- David Wilburn [hidden email] K4DGW _______________________________________________ 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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Dave,
I do not have enough data to tell you whare to start on the current problem. Check voltages and look for charred components or burned PC board traces. Be certain the 8 volt regulator on the control board is supplying voltage and follow its path onto the RF Board. On your 'original problem', you apparently have installed the "Rework Eliminators" and I must offer yet another RANT: You may not have fully followed the instructions that came with the 'Rework Eliminators'. My beef with the rework eliminator folks is that this one item is SO VERY important and they apparently still do not put it in big bold warning letters. When you change C71 to 120 pf in the VCO area you must enter the secondary menu and set D19 - y. But also keep in mind that with the 120 pF value at C71, your VCO voltage range can no longer be completely tested - the lowest voltage will now occur on 60 meters at 5300 kHz, so you will have to remember to revisit the VCO voltage alignment after the K60XV is installed. The K2 manual is quite correct in saying that none of the K60XV parts should be installed until after the K2 has been completed and aligned. Unfortunately the K60XV part of the Rework Eliminators is NOT, I repeat NOT 'plug and play'. About 6 months ago I had several email exchanges with Gary H. about this problem, and at one point he said something would be done about it, but still this matter crops up over and over again, so I can only assume that it has not been corrected in their documentation with adequate warnings. In other words Dave, the Rework Eliminators have broken your K2 by causing you to try to correct a problem where there was none. RANT off. 73, Don W3FPR > -----Original Message----- > > While troubleshooting the "original problem" below, I was making > changes, powering it up, checking, powering down, making changes, and at > one point I had the radio off but 12v still on and connected. I decided > to re-flow the connection at the junction of C68 where it connects to > R17. There was a small spark, I stopped, turned off power, and > disconnected it. > > On the next power up I had an Info message. I did not hear any relays, > I think it may have been info 080, but not sure. I got the same message > (what ever it was 080, 108, or 118) on the next power up. I cycled power > again, and the relays kicked and I got the Elecraft display. Now the > voltage reading for ALL bands is 7.94. It seems the instant grounding > of the input of Q18 (with my ***verified*** grounded soldering iron) is > not desirable. And just to make it interesting, when ever I figure out > what gave way to the instant grounding, and get the part(s) in on-site, > and re-installed, I will likely have the "original problem" there > waiting for me. > > Seems to me I read somewhere that you shouldn't stay after it after > getting tired, cause you will make bad decisions. Seems to me, it was > even mentioned in a discussion with NU4I (Ken Moorman) today on the > phone. Some people's kids, they just don't learn. > > Original problem > ===================================================================== > The voltage readings for 7000/7300 are 7.92. It is not much above the > window of 7.5, but they do not vary with frequency as the others do. > All other voltages are well within tolerances. Adjustments to L30, do > not change the voltage on the 7k range of frequencies. > > I have installed D19, and D20, and C71 is a 120pf cap. They are part of > the rework eliminators supplied items. > > I have verified C71-C74, and D21-D26. > > I have re-flowed all the solder connections associated with K13, K14, > and K15, and most of the surrounding circuitry. > > Band Low Freq Voltage High Freq Voltage > ==== ======== ======= ========= ======= > 80m 3500 2.308 4000 5.99 > 40m 7000 7.94 7300 7.94 > 30m 10000 3.120 10150 3.677 > 20m 14000 2.587 15000 4.27 > 17m 18000 3.333 18200 3.539 > 15m 21000 2.482 21450 3.656 > 12m 24800 4.22 25000 4.61 > 10m 28000 3.512 28800 4.39 > > > -- > > David Wilburn > [hidden email] > K4DGW > No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.3/697 - Release Date: 2/22/2007 11:55 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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Ok, thanks. I will take a look around later today. I did not see
anything else "go" at the time. Man, and I thought I felt bad before you email. ***Yes***, the note about changing the menu is in there. ***So the fault is mine.*** I did all the rework eliminators requirements on page 59. I had a note in the alignment page about checking the rework eliminators documentation. When I went to their page, I did the installation of all the connectors and such and thought I was done. I then saw the note in the Alignment section, and assumed (yea, I know what it means) that it was referring to the headers I had just installed. So to reward everyone's (yours, Gary, and Ken's) efforts to make the rework eliminator's product more idiot proof, I have invented a better idiot. David Wilburn [hidden email] K4DGW Don Wilhelm wrote: > Dave, > > I do not have enough data to tell you whare to start on the current problem. > Check voltages and look for charred components or burned PC board traces. > Be certain the 8 volt regulator on the control board is supplying voltage > and follow its path onto the RF Board. > > On your 'original problem', you apparently have installed the "Rework > Eliminators" and I must offer yet another RANT: > > You may not have fully followed the instructions that came with the 'Rework > Eliminators'. > My beef with the rework eliminator folks is that this one item is SO VERY > important and they apparently still do not put it in big bold warning > letters. > > When you change C71 to 120 pf in the VCO area you must enter the secondary > menu and set D19 - y. > > But also keep in mind that with the 120 pF value at C71, your VCO voltage > range can no longer be completely tested - the lowest voltage will now occur > on 60 meters at 5300 kHz, so you will have to remember to revisit the VCO > voltage alignment after the K60XV is installed. > > The K2 manual is quite correct in saying that none of the K60XV parts should > be installed until after the K2 has been completed and aligned. > Unfortunately the K60XV part of the Rework Eliminators is NOT, I repeat NOT > 'plug and play'. > > About 6 months ago I had several email exchanges with Gary H. about this > problem, and at one point he said something would be done about it, but > still this matter crops up over and over again, so I can only assume that it > has not been corrected in their documentation with adequate warnings. > > In other words Dave, the Rework Eliminators have broken your K2 by causing > you to try to correct a problem where there was none. > > RANT off. > > 73, > Don W3FPR > >> -----Original Message----- > >> While troubleshooting the "original problem" below, I was making >> changes, powering it up, checking, powering down, making changes, and at >> one point I had the radio off but 12v still on and connected. I decided >> to re-flow the connection at the junction of C68 where it connects to >> R17. There was a small spark, I stopped, turned off power, and >> disconnected it. >> >> On the next power up I had an Info message. I did not hear any relays, >> I think it may have been info 080, but not sure. I got the same message >> (what ever it was 080, 108, or 118) on the next power up. I cycled power >> again, and the relays kicked and I got the Elecraft display. Now the >> voltage reading for ALL bands is 7.94. It seems the instant grounding >> of the input of Q18 (with my ***verified*** grounded soldering iron) is >> not desirable. And just to make it interesting, when ever I figure out >> what gave way to the instant grounding, and get the part(s) in on-site, >> and re-installed, I will likely have the "original problem" there >> waiting for me. >> >> Seems to me I read somewhere that you shouldn't stay after it after >> getting tired, cause you will make bad decisions. Seems to me, it was >> even mentioned in a discussion with NU4I (Ken Moorman) today on the >> phone. Some people's kids, they just don't learn. >> >> Original problem >> ===================================================================== >> The voltage readings for 7000/7300 are 7.92. It is not much above the >> window of 7.5, but they do not vary with frequency as the others do. >> All other voltages are well within tolerances. Adjustments to L30, do >> not change the voltage on the 7k range of frequencies. >> >> I have installed D19, and D20, and C71 is a 120pf cap. They are part of >> the rework eliminators supplied items. >> >> I have verified C71-C74, and D21-D26. >> >> I have re-flowed all the solder connections associated with K13, K14, >> and K15, and most of the surrounding circuitry. >> >> Band Low Freq Voltage High Freq Voltage >> ==== ======== ======= ========= ======= >> 80m 3500 2.308 4000 5.99 >> 40m 7000 7.94 7300 7.94 >> 30m 10000 3.120 10150 3.677 >> 20m 14000 2.587 15000 4.27 >> 17m 18000 3.333 18200 3.539 >> 15m 21000 2.482 21450 3.656 >> 12m 24800 4.22 25000 4.61 >> 10m 28000 3.512 28800 4.39 >> >> >> -- >> >> David Wilburn >> [hidden email] >> K4DGW >> > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.441 / Virus Database: 268.18.3/697 - Release Date: 2/22/2007 > 11:55 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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