[Elecraft] K3S Audio buzz on transmit, especially AM

[Bob McGraw K4TAX]

Yes but the EQ is in the digital path.  The EQ should be done there, preferably after the MIC input.   The AM BW does not attenuate the end like the SSB filter. 

I suggest -16 dB on the first 3 bands. 

Bob, K4TAX


Sent from my iPhone

> On Apr 26, 2019, at 6:38 PM, Nicklas Johnson <nick at n6ol.us> wrote:
> 
> 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.
> ______________________________________________________________
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