Posted by
Nicklas Johnson on
Apr 26, 2019; 10:48pm
URL: http://elecraft.85.s1.nabble.com/K3S-Audio-buzz-on-transmit-especially-AM-tp7651148p7651190.html
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 <
[hidden email]> 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
>
[hidden email] - 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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