[Elecraft] K3 Hum on Audio...
NZ0T
nz0tham at gmail.com
Fri Jan 13 15:33:41 EST 2012
Phil, which firmware version are you using? I was using the beta 4.47 and
I developed audio problems the other night, After I deleted 4.47 and went
back to the latest production firmware all was fine. Sorry if this has
already been discussed - I just read this thread.
73 Bill NZ0T
On Fri, Jan 13, 2012 at 1:32 PM, Phil Hystad-3 [via Elecraft] <
ml-node+s365791n7185299h67 at n2.nabble.com> wrote:
> 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
> >
>
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