[Elecraft] K3: KPA100 Squeal

[Joe Harris]

Do the fans turn on when the K3 is in TX test mode?

On Mon, Jun 27, 2011 at 10:21 AM, Guy Olinger K2AV <olinger at bellsouth.net>wrote:

> Check to make sure that the cables routed in front of the fans are not
> touching.  A light touch will result in a sound like that.  It will
> change or go away with the fan speed.
>
> 73, Guy.
>
> On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei <e.adi.andrei at gmail.com>
> wrote:
> > I have the same thing happening, similar series K3 (5k something) , also
> assembled in March.
> >
> > Adi
> > 2E0TTX
> >
> >
> > On 27/06/2011 13:38, Joe Harris wrote:
> >> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in
> >> March. It makes the sound even if I am in TX test mode. Again, no
> >> performance issues, just a slightly bothersome squeal / whine.
> >>
> >>
> >>
> >> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<liltechdude13 at gmail.com
> >wrote:
> >>
> >>> First off it was a great Field Day and my new K3 impressed me extremely
> not
> >>> only in performance but in it's functionality.
> >>>
> >>> To kick off Field Day I installed a new KPA100 into the K3. I did all
> the
> >>> necessary TX gain calibrations using a dummy load.
> >>>
> >>> One thing I noticed immediately was that I was hearing a very high
> pitched
> >>> squeal coming from either the PA board or possibly the KIO3 (the board
> the
> >>> amp plugs into). The squeal seems to vary in frequency each time the
> >>> transmitter keys up (can only hear it when the radio is in TX). The
> squeal
> >>> is not very loud but its loud enough for me to hear it if I listen
> closely.
> >>> It doesn't seem to be power related. The squeal is there even if the
> radio
> >>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I
> can
> >>> compare the sound to is perhaps a tiny leak in an air hose. Is this
> typical
> >>> of a bad solder joint or something?
> >>>
> >>> This squeal only pertains to the new KPA100 installation. Before the
> amp
> >>> was installed I didn't hear a thing.
> >>>
> >>> I should also note that nothing appears to be affecting performance.
> Puts
> >>> out 100 watts no problem. Clean modulation, etc.
> >>>
> >>> --------------
> >>> Geoffrey Wolf
> >>> AB3LS (Amateur Radio Callsign)
> >>> University of Pittsburgh '14
> >>> grw20 at pitt.edu
> >>> Liltechdude at me.com
> >>>
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> >>
> >>
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-- 
Joe Harris, N1QD