[Elecraft] K3S Audio buzz on transmit, especially AM

[Nicklas Johnson]

Flat, except I turned the first one down a few notches, which doesn't
really do much in my case because both the microphone and mixer that I use
(when they're actually connected) roll off below 150 and 80 Hz
respectively.  It had previously been suggested to me that rolling off low
frequency cruft is a good idea for AM and SSB.

   Nick

On Fri, 26 Apr 2019 at 15:57, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:

> I recall commenting earlier.  What TX EQ values are being used for AM. ?
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
> > On Apr 26, 2019, at 5:48 PM, Nicklas Johnson <nick at n6ol.us> wrote:
> >
> > My desk in this case sits adjacent a wall, and there's only a shower on
> the
> > other side of that wall.  I did turn off everything in the vicinity of
> the
> > desk and all the lights in the room (I've in fact heard a very similar
> hum
> > from the switching power supply for my mixer, and my first thought was it
> > was this that was being picked up), but I didn't turn off the computer on
> > the other side of the room.  In this case it will be easier to move the
> rig
> > outdoors with a battery than it will be to turn that computer off for the
> > moment.  It would have to be an impressively/obnoxiously strong magnetic
> > field from that side of the room to influence the transformers inside the
> > rig 8 feet away, but it's worth trying and simple enough to rule it out.
> >
> >   Nick
> >
> >> On Fri, 26 Apr 2019 at 14:51, Don Wilhelm <donwilh at embarqmail.com>
> wrote:
> >>
> >> In addition to operating from a battery isolated from the solar system,
> >> I would recommend that you do a quick test - remove all cables from the
> >> K3S except the power cable and a coax to a dummy load.  Power down all
> >> power supplies in your station, including any desk lamps.
> >> Go into Transmit by tapping the XMIT button.
> >> Is the hum still present?  If not, then start connecting things to your
> >> K3S one at a time, doing the same test after each thing connected.
> >>
> >> Of course, if the hum is present with nothing connected, contact
> >> support at elecraft.com - but I cannot imagine a hum with harmonics of 60
> >> Hz being induced if you take away all the 60 Hz operated sources in the
> >> area.
> >>
> >> 73,
> >> Don W3FPR
> >>
> >> --
> > *N6OL*
> > Saying something doesn't make it true.  Belief in something doesn't make
> it
> > real. And if you have to lie to support a position, that position is not
> > worth supporting.
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>

-- 
*N6OL*
Saying something doesn't make it true.  Belief in something doesn't make it
real. And if you have to lie to support a position, that position is not
worth supporting.