Jean-Francois, Can you check your microphone? That sounds a lot like a bad mic element to me. Try another mic if you can - if you are wired for the electret mic (with the resistor), then you can even use one of the inexpensive computer mics.
In any case, substantiating that the mic is good is the first step in troubleshooting a problem like you described. As an alternative you could feed known clean audio into your K2 from an audio generator, or even make up a voltage divider and feed audio from the computer soundcard or a portable CD Player into the K2 (just don't transmit on the air). Using a controlled audio source will allow you to troubleshoot a problem inside your K2 with your 'scope much easier than trying to do it live with a microphone. If you do not know how to build up the voltage divider required, take a look at some of the PSK31 'how-to' websites for the simple interface schematics - you need only the soundcard output half of the interface. 73, Don W3FPR > -----Original Message----- > > I have a K2 that work great since 2003, but this morning.... Nop. > > Nothing change on my setup, I was just operate my rig this morning as > usual and found this morning that my SSB TX audio looks horrible... > sounds like RF feedback a few hams told me..... but... > > I tried the K2 on a dummy load and listened up with my KX1, and I found > that when I start to speak, the audio is like «scribble» or like a > defective speaker that fuzz. It seems to be worst at the beginning of > the transmission. I have only 1 bar or 2 on ALC reading. It sounds like > overdriven, but ALC reading on the bar graph seems OK. > > I also remove every options and installed my un-mod kit to replace > options. I'm running the basic K2 with only the SSB adapter... > nothing else. > > I did again the SSB calibration procedure, nothing at all, everything is > OK on this side. > > I tried every audio gain and compressor combination, the problem still > there, not worse, not better. > > Does somebody have something to suggest me to start with ??? This is my > first real problem from the beginning, so I don't have much experience > in finding problem. > > I have a scope, but with not much experience on how to test... > > Thanks for your help !! > > J-F VA2VYZ > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.15/580 - Release Date: 12/8/2006 12:53 PM _______________________________________________ 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
