Greeting to the List,
This is my first post. I'm building K2 sn5939 and have hit a snag at alignment and test part II. It actually went through all of the tests and alignment OK, but when I hooked an antenna up to try the receiver I notices some unusual symptoms. To cut to the chase, what I have found is the PLL reference oscillator output low. It measures .3v at pin 1 of U4. The expected value is .8v-1.8v . The frequency counter picks up the output and the output frequency varies over the proper range. I have checked yet again for bridges, cold solder joints and all component values. All seems correct. The DC source voltage measures 1.27v with an expected value of .8v . This tells me Q19 is not conducting as it should. Before I declare Q19 lightly toasted, does anyone have any ideas or suggestions? Thanks. Chuck K4QS _______________________________________________ No banners. No pop-ups. No kidding. Make My Way your home on the Web - http://www.myway.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
