so you unplug the mike input to K3 the hum goes away when you plug into the K3 mike input the hum is there ? I would think you have a bad mike/cord/connecter
Bob K3DJC On Fri, 13 Jan 2012 11:31:38 -0800 Phil Hystad <[email protected]> writes: > Ron, > > Well, I just had a quick SSB chat with Clyde (AA7WC) (pre Noon Time > net on 40 meters) and asked specifically for audio report with > possible hum. His report was no hum, clear good sounding audio, > with S7 signal. > > So I am suspicious of my florescent lights in the garage although > they are on right now with no hum. I am thinking though that maybe > there is something intermittent with those lights. But, then again, > the "something loose in the mic cord" maybe be the cause too. But, > I jiggled that cord and connection and so on quite vigorously before > when I had the hum and it did not change the hum status. Then, when > the hum disappeared, I did those jiggle the cord and connector on > the mic tests again and the hum DID NOT come back. > > Wow, I can't believe I have spent the entire morning fooling around > with this. I even called into work and said that I was not coming > in today just to work on this problem. I don't really want to go > outside anyway despite that the temperature has now risen to a > toasty 36 degrees. > > 73, phil, K7PEH > > > On Jan 13, 2012, at 11:23 AM, Ron D'Eau Claire wrote: > > > Good luck Phil. That last part really suggests something loose in > the mike > > cord as I suggested at first. > > > > Ron AC7AC > > > > -----Original Message----- > > Ron, > > > > OK, now it appears I was mistaken when I said that that the hum > was in both > > mics. I think I flubbed something up in my previous test due to > the way > > that the macros are assigned to keys which led me to thinking that > the hum > > occurred in both mics. But, I learned something in this... > > > > One, don't try to use one of your macro assigned keys (in my case > M2 and M1) > > while in the menu because that merely reassigns the key to the new > menu > > entry. I made this mistake several times this morning. But, when > I > > discovered it and then reset my macro definitions, I rediscovered > that the > > HUM occurs in the front panel MH2 hand held mic only. I did this > test > > several times to make sure I was not confusing things. > > > > I discovered something else that I did not know before. PTT is > actuated by > > any of the methods of PTT. So, when I thought I had the > headphones CM500 > > mic enabled I used my foot switch for push to talk and since that > worked for > > some dumb reason I was thinking I had successfully switched from > front panel > > to rear panel. But, I had not. I also discovered that I could > use the hand > > mic (front panel) PTT switch even though my rear panel mic was > being used. > > Now, after I discovered this, I realize that it is obvious but > something > > that lead to my confusion. > > > > So, the problem occurs on the FRONT PANEL mic only and not the > rear panel. > > And, the problem occurs when the K3 is in TOTAL isolation from all > AC > > sources except for possibly me. I mean, I am holding the mic but > then I > > don't think that is a cause of the hum because I tried it with a > insulated > > hand and it still caused the hum on the front panel mic. > > > > I doubt that this is caused by wall-outlet type AC because I have > erased all > > AC for some of my tests. And, besides, this problem seemed to > occur .... > > > > OK, while writing that last sentence something occurred to me. > Another > > change I had made on Wednesday after I had my good audio reports > on the MH2 > > front panel mic was that I set the configuration for the band > specific power > > levels to work with the KPA500. So, I just now went to test the > mic and > > change that setting around but the hum is gone. > > > > I repeat, the hum is gone from the front panel mic. I now can't > test the > > band specific power menu setting because I have no problem. > > > > But, I have a suspicion as to the cause now and I am going to do > some other > > experiments. > > > > 73, phil > > > > ______________________________________________________________ > 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 > > ____________________________________________________________ Get Free Email with Video Mail & Video Chat! http://www.juno.com/freeemail?refcd=JUTAGOUT1FREM0210 ______________________________________________________________ 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
