Jerry, One thing at a time is certain. I figure you are using the normal K2 output to drive the XV50 - if you are using the K60XV outputs, the PA should be disabled (no drive).
See if the K2 does the same thing on 28 MHz with a dummy load attached - if it does, then you are correct to blame the PA transistors (and Q11/Q13) rather than the XV50. Test one element at a time - trying to do the K2 and the XV50 together is an exercise to create frustration. Be certain the K2 is behaving properly into a dummy load before adding the XV50 to the mixture of 'things that could be wrong'. If your XV50 does represent a high SWR, then you have made an error in the input attenuator section. The attenuator alone should assure a good 50 ohm load to the K2. Yes, I do suspect that you have a K2 PA problem - if you have changed Q11 and Q13 before, make certain that the hru-plated holes have not been damaged in the removal process. If that is a possibility, solder the Q11 and Q13 leads both on the top and bottom of the board (there is no need to mount the transistors flat to the board - leave about 1/8 inch of lead above the board. 73, Don W3FPR n0jrn wrote: > Evening gang: > > Having some fun with my K2 these days. I've been attempting to set up my > new K60XV and XV50. > > While trying to set the inductors inside the XV50 I noted I wasn't getting > enough drive from the K2 to bring the voltage up where it should be. > > Back to that later ! > > Now I'm seeing high current in the K2. 5 watts output show nearly 4 amps > draw. OUCH > > Checked Q7 and Q8 and dang if my collector voltage isn't dropping way down > on both. Q7 drops to approx 6.5 volts and Q8 all the way down to 3.5 volts. > > Dang it ! Checked Q11 and Q13 and the collector on Q13 is > also low. I'm headed to Elecraft to order the PA kit for repairs. > Anything else I need to be checking ????? > > FWIW K2 still putting out approx 8 watts but current is way up. I'll > assume the PA will fix my problems and I can go about figuring out why the > K60XV represents such a high SWR. > > I did recheck the I/O for the board and that was good. > > OH Well ! One thing at a time ! > > > ______________________________________________________________ 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
