[Elecraft] K3S Audio buzz on transmit, especially AM

[Bob McGraw K4TAX]

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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