Stan, Since the K1 was operating into a high SWR, the most likely failure is the zener diode across the PA transistor output - it is there to kill high RF voltage spikes, and with a high SWR, the RF voltage will be either lower than normal or higher than normal at the PA collector depending on whether the feedline impedance is high or low (Ohm's law prevails).
The diode is D19. Try removing one end of it and see if the K1 transmits into a dummy load - if it does, then just replace the diode. If it still does not transmit, it is likely that the PA transistor and/or one of the components in the PA output have also been damaged. Moral, do not operate the K1 (or most any other transmitter) into a high SWR. 73, Don W3FPR On 1/4/2011 1:46 PM, Stan Grigaliunas wrote: > I purchased a used K1 without the ATU. I had it on receive 40m for couple > hours. All worked great being hooked up to a G5RV. I went through the Menu, > checked all the parameters, and only changed one option. ( set Filter 1 from > 300 to 200 ). Then I got brave and plugged in a key! The radio was powered > by Radio Shack 3 amp supply. After sending about a couple dozen of VVV’es, > the K1 shut down and will not come to life. The power supply is ok, 13.8 > volts, but when I turn the power ON, the voltage goes way way down to almost > nothing. Nothing seems to run hot or even smoke. The 3 amp fuse in the > supply does not blow. > > This is my first experience with K1. I took the top cover off and looked > around. Looks like it was built by a professional. Soldering is perfect, > like it was done by a machine. Very impressed on the workmanship and > construction. > > Any good suggestions what to look for? any recommendations on a decent > repair shop? > > 73 > Stan > K8SRB > ______________________________________________________________ > 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 ______________________________________________________________ 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
