Greetings. I have barely used my K2 going on about two years now. It seemed to work well when I first got it off the person who had assembled it. I got occasional comments about good audio when operating on SSB. I then started applying the mods to bring it in line with the post 3000 serial number units, applied the PLL stability mode, and replaced the crystals with a more closely matching set, and completely re-aligned the radio.
Since then, the radio seems to have become slightly deaf, and I also have some issues with transmit audio. I've considered selling it to someone who could fix it and starting over. Having acquired a good digital storage oscilloscope some months back, I'm going to have another shot at trying to fix the problems. I'll start by working on the receive issues. I'm planning to get one of the Elecraft signal generator kits to help with tracking down the receiver issues. Since I don't currently have one, I'm starting with the cheap and dirty signal tracing notes from Tom, N0SS. I pulled out the KSB2 and disconnected the KAT2 to eliminate them as a source of problem. I have noticed one odd thing when using a random length of wire and touching one end of it to the indicated test points. Touching the wire to either side of C6 (RF Board page 3), the S meter reading on the front panel goes up by about 2 LED's. What is odd is that if I touch W6, or either end of D6 (the previous and next points in the signal chain) I don't see this level of increase in signal level. This isn't making sense to me right now. I would think I would get the same signal level increase at either W6, or D6, but not at neither point compared to both sides of C6. Could this indicate bad, or wrong value caps, for C5 and/or C7? Any other thoughts about this rather odd behaviour? Seems to be pointing towards something to investigate further but I hope I don't have to removed that bottom rear panel as its more of a pain to remove. ______________________________________________________________ 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
