K2 power limitation
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Hi
Finished building K2 but found a problem. TX power is always under 5W on ALL bands. I found my wrong install of T4 (1-2 and 3-4 are reversed !) Does this make the problem ??? 73 de aki, ja1nlx _______________________________________________ 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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If T4 1-2 and 3-4 were symmetrical I would think it would be okay.
However, they are not symmetrical as 1-2 has 2 turns and 3-4 has 3 turns. Sounds like you should unsolder it and try installing it the other way. It may be easiest to cut the bare wires (5-6 and 7-8) before unsoldering the green and white wires. You likely have enough wire leftover to make 5-6 and 7-8 again, but not 1-2 and 3-4 (I think I had enough to make 1-2 again if neccessary but definately not 3-4). Correct installation of T4 should improve your output power. If you wound T4 as a 2:2 ratio for better efficiency at 5W then it would likely be okay (note on the schematic for T4), but since you are complaining about not enough output power you should unsolder and install correctly, then play with alternatives later after you are satisfied with performance. Mark, NK8Q K2 4786 a.yoshida wrote: >Hi > >Finished building K2 but found a problem. > >TX power is always under 5W on ALL bands. > >I found my wrong install of T4 (1-2 and 3-4 are > >reversed !) > >Does this make the problem ??? > >73 de aki, ja1nlx > >_______________________________________________ >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 a.yoshida
Aki,
If you still have T4 reversed, yes, it would account for the problem. If you now have T4 correct and still have low power, look carefully at the Low Pass filters. 73, Don W3FPR > -----Original Message----- > Finished building K2 but found a problem. > > TX power is always under 5W on ALL bands. > > I found my wrong install of T4 (1-2 and 3-4 are > > reversed !) > > Does this make the problem ??? > > 73 de aki, ja1nlx > _______________________________________________ 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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Don
Thanks for your help. Will re-install T4 and see how K2 works. 73 de aki, ja1nlx ----- Original Message ----- From: "W3FPR - Don Wilhelm" <[hidden email]> To: "a.yoshida" <[hidden email]>; <[hidden email]> Sent: Monday, March 28, 2005 1:13 PM Subject: RE: [Elecraft] K2 power limitation > Aki, > > If you still have T4 reversed, yes, it would account for the problem. > If you now have T4 correct and still have low power, look carefully at the > Low Pass filters. > > 73, > Don W3FPR > > > -----Original Message----- > > Finished building K2 but found a problem. > > > > TX power is always under 5W on ALL bands. > > > > I found my wrong install of T4 (1-2 and 3-4 are > > > > reversed !) > > > > Does this make the problem ??? > > > > 73 de aki, ja1nlx > > > > _______________________________________________ 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
The problem has been solved. K2 shows good enough power on all bands after re-install T4. Thanks guys who gave me good suggestion. 73 de aki, ja1nlx ----- Original Message ----- From: "a.yoshida" <[hidden email]> To: <[hidden email]>; <[hidden email]> Sent: Monday, March 28, 2005 1:25 PM Subject: Re: [Elecraft] K2 power limitation > Don > > Thanks for your help. > > Will re-install T4 and see how K2 works. > > 73 de aki, ja1nlx > > > ----- Original Message ----- > From: "W3FPR - Don Wilhelm" <[hidden email]> > To: "a.yoshida" <[hidden email]>; <[hidden email]> > Sent: Monday, March 28, 2005 1:13 PM > Subject: RE: [Elecraft] K2 power limitation > > > > Aki, > > > > If you still have T4 reversed, yes, it would account for the problem. > > If you now have T4 correct and still have low power, look carefully at > > Low Pass filters. > > > > 73, > > Don W3FPR > > > > > -----Original Message----- > > > Finished building K2 but found a problem. > > > > > > TX power is always under 5W on ALL bands. > > > > > > I found my wrong install of T4 (1-2 and 3-4 are > > > > > > reversed !) > > > > > > Does this make the problem ??? > > > > > > 73 de aki, ja1nlx > > > > > > > > > _______________________________________________ > 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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