Don, I did extract the old Q7 without any damage or problems.
I was looking at the spec sheet for the 2N3904 after getting your last suggestion and after ordering the 2N4124 from Elecraft. Do you think the 2n3904 is a superior replacement for the 2n4124? Any reason to suspect it would not work or why the 2n4124 was chosen for that circuit? 73, Jerry On Wed, May 25, 2011 at 5:13 AM, Don Wilhelm-4 [via Elecraft] < [email protected]> wrote: > Jerry, > > That voltage would indicate Q7 may be at fault. > If you do not have a proper replacement, but do have a 2N2222A or 2N3904 > in stock try one of those as a test. > > 73, > Don W3FPR > > On 5/24/2011 11:48 PM, Jerry W7ANM wrote: > > > Thanks Don, > > > > Maybe were getting somewhere. Q7s base is at zero during receive but on > > transmit it only goes to 0.1v. > > The 6T_2 voltage on the other side of R28 goes from 0v during receive > then > > to 5.63v on transmit. (Normal?) > > > > Looks like I will need to get another Q7? > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden > email]<http://user/SendEmail.jtp?type=node&node=6402456&i=0> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > > http://elecraft.365791.n2.nabble.com/KX1-Please-need-help-with-T-R-thump-tp6395259p6402456.html > To unsubscribe from KX1 Please need help with T/R thump, click > here<http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=6395259&code=ZXlla2F6b29AZ21haWwuY29tfDYzOTUyNTl8MjAwOTM2MDIxNg==>. > > -- View this message in context: http://elecraft.365791.n2.nabble.com/KX1-Please-need-help-with-T-R-thump-tp6395259p6407957.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
