I should also add that you can find these components if you pull the bottom front cover off (the one with the bail on it) and look toward the right side when the radio is sitting on its top...
~Brett (N7MG) On Sun, Jun 27, 2010 at 5:35 PM, Brett Howard <br...@livecomputers.com> wrote: > You may look into checking Q8 and Q9 in the post amplifier. You can see > what I'm talking about in the top right section of page 8 on the > schematics (here): > http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf > > Also check the resistors around that area for stuff that looks like it > got hot... R66, R68, R56, R75 and the like... > > I had something similar happen to me and Q9 blew on my radio. Replace > Q8 and Q9 together if its needed as well as any of the resistors that > had a hard day and you should be ok... > > The K3 does have protection for this if you have the mod in place that > helps make it happen. The current through this path is monitored and if > the power in gets too high it can turn off your preamp or engage the ATT > to try and protect itself. However when running high power with > multiple stations in close proximity there are procedures and equipment > that should be in place or you're going to have problems no matter what > brand of radio you're running. > > ~Brett (N7MG) > > On Sat, 2010-06-26 at 06:06 -0700, NZ0T wrote: >> We had one guy get on 75 with a KW with another on 40. Guy on 40 didn't >> know. He got the RFI warning, the K3 locked up and he smelled smoke. Now >> his K3 has no RX at all. I thought there was a high power protection >> circuit? We have other rigs to use but any input as to what needs to be >> done with the smoked K3 would be appreciated before he sends it back to >> Aptos. >> >> 73 Bill NZ0T My K3 is OK > > > ______________________________________________________________ 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
