Re: [Elecraft] [K1] TX part sick
Don, many thanks. Manual is printed now. I am going to do it step by step accordingly during coming Easter holiday. I will report then after...:) 73 Petr - 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K1] TX part sick
Petr. Turn that manual to Appendix E near the back. And on page 6 of that Appendix, you will find Transmitter Signal Tracing. Set up the K1 as instructed there, and no damage will be done. Then make the measurements in the order listed. You will need an RF probe. If you are using an oscilloscope (with a 10X probe), multiply the expected values by 2.8 to obtain the expected peak to peak RF voltage measurements. At the FIRST measurement that is significantly less than the expected value (expect as much as a 10% variation before saying it is significant) you have reached the output of the failing stage. Correct that stage and move onward to the next failure point. That is the procedure required to determine why it is not working. If the final is blown, replace it with the K1PAKIT from Elecraft. 73, Don W3FPR On 4/16/2019 9:17 AM, Petr, OK1RP/M0SIS wrote: Don, I checked other parts in TX section and it seems to be ok (refer to manual 2000 Rev. D). Just removed the 5th turn on secondary winding of T3. Is there something else strange or danger which I should check in order to avoid smoke during the test or even blowing the final please? Many thanks mate, Petr - 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K1] TX part sick
Don, I checked other parts in TX section and it seems to be ok (refer to manual 2000 Rev. D). Just removed the 5th turn on secondary winding of T3. Is there something else strange or danger which I should check in order to avoid smoke during the test or even blowing the final please? Many thanks mate, Petr - 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K1] TX part sick
Don, many thanks for hints. I will re-check all cores on RF board as same as on band module... We got this K1 in "repair needs" state from friend and the receiver sounds nice at the moment. So I would like to finish the repairing of TX path which burned to builder probably during alignment. I will let you know... at this moment I checked on RF board that T4 is wounded ok (not nice but correct) but T3 has more turns on secondary winding side. I will check all others to be sure there is no more mistakes. I do not know if the final transistor survived the last action > but we will see. MNI TNX, 73 Petr - 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com G+:http://goo.gl/w3u2s9 G+: http://goo.gl/gP99xq -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K1] TX part sick
Petr, The number of turns on T4 is not likely to make much of a difference, but I recommend correcting it just the same. However, it is an indicator that there may be other toroids in that K1 with an extra turn on them, so check all of them. As for the transmit problem, it is only a guess for what may be wrong - the best answer if "anything" in the TX chain. The best way to approach that problem is to turn to the back of the manual and do the Transmit Signal Tracing to determine which stage is failing. It sounds like that K1 may have experience a lightning event (the burned capacitors are an indicator of that), so you may have multiple failures. Work them one at a time. Correct each one in turn and re-test after each correction. 73, Don W3FPR On 4/15/2019 3:44 AM, Petr, OK1RP/M0SIS wrote: Hi all, I am trying to repair the son's K1 where the TX seems to be sick. (receiver sounds hot and quite nice on both bands 40/20m) I found several C0G caps around the cores on the module board burned as same as K1 relay so I replaced them all after long time searching them on the market (EU). Now I am trying to check step by step according to manual the RF board (RF 2000 Rev.D) and I found that original builder (we did not built it) wound 5 turns of secondary T3 (green wire) instead of 4 described in manual. Should I remove the turn from T3 or is it possible to adjust the TX even with that mistake? I would like to avoid another burns... __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] [K1] TX part sick
Hi all, I am trying to repair the son's K1 where the TX seems to be sick. (receiver sounds hot and quite nice on both bands 40/20m) I found several C0G caps around the cores on the module board burned as same as K1 relay so I replaced them all after long time searching them on the market (EU). Now I am trying to check step by step according to manual the RF board (RF 2000 Rev.D) and I found that original builder (we did not built it) wound 5 turns of secondary T3 (green wire) instead of 4 described in manual. Should I remove the turn from T3 or is it possible to adjust the TX even with that mistake? I would like to avoid another burns... Many thanks, - 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com G+:http://goo.gl/w3u2s9 G+: http://goo.gl/gP99xq -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
