Greetings I'm a newbie building a K1-4. Everything was going OK until the receiver alignment phase of the build where I ran into a problem where I could not hear anything on 20M.
After searching the list and several exchanges with Elecraft support, I had not gotten anywhere in resolving the problem. Based on previous issues seen on the list regarding 20M, Elecraft did send me a couple of replacement crystals for the band. In the mean time, I completed the transmitter section and was able to get output on 40, 30, and 15 - no output on 20 as per an external wattmeter. Replacing the 20M crystal had no effect. Using my Ten-Tec RX-320D, I was able to verify operation of all the crystals, including 20M. I put together a RF probe this weekend and started signal tracing. This is what I have found, though the finding does not make much sense to my inexperienced mind. At step 8 in the signal tracing procedure in the K1 Manual, I was getting 0 voltage on 20M, and anywhere from 0.025 t0 .035 on the other bands. I started tracing back from P1 pin 6, and took a reading at T2 which is the source of my puzzlement. I can see voltage on all bands going into T2 on lead 3, but no voltage at lead 2 for 20M - I'm getting a reading on lead 2 for all other bands. So it appears T2 may be the source of my problem. But it doesn't click with me that the toroid can be a problem with just one band. One other oddity is that even though I'm not seeing any signal on the external wattmeter I can hear 20M on the RX-320. Am I on the right track here, or do I need further testing before working on T2? THX, and 73 Don, KJ4MRB ______________________________________________________________ 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
